Generac Power Systems Portable Generator 009600 5 009734 5 User Manual

®
POWER SYSTEMS, INC.  
Owner’s Manual  
Air-cooled Recreational  
Vehicle Generators  
• Model: 009600-5 and 009734-5  
PRIMEPACT 66G and 66LP  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Table of Contents  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Part I — Operating Instructions  
Part II — Installation Instructions ........................................17  
Safety Rules..........................................................................18-19  
Section 5 — General Information..........................................20  
Introduction..................................................Inside Front Cover  
Read This Manual Thoroughly ..........................................IFC  
Contents ............................................................................IFC  
Operation and Maintenance ..............................................IFC  
How to Obtain Service ......................................................IFC  
Authorized Service Dealer Locator Number ..........................IFC  
Safety Rules..................................................................................2  
Section 1 – General Information ............................................4  
5.1  
5.2  
5.3  
5.4  
5.5  
5.6  
Purpose and Scope of the Manual................................20  
Safety ..........................................................................20  
Standard Booklets ......................................................20  
Equipment Description................................................20  
Generator Engine Operating Speed..............................20  
Generator AC Connection System................................20  
Major Dimensions and Features ..................................21  
1.1  
1.2  
1.3  
1.4  
1.5  
1.6  
Generator Identification ................................................4  
Generator Applicability..................................................5  
Installation ....................................................................5  
Safety ............................................................................5  
Generator AC Connection System..................................5  
Specifications ................................................................6  
1.6.1 Fuel Requirements & Consumption ....................6  
1.6.2 Engine Oil Requirements ....................................6  
1.6.3 Generator Specifications......................................6  
1.6.4 Engine Specifications ..........................................7  
1.6.5 Emissions Compliance Period ............................7  
Section 6 — Installation ..........................................................22  
6.1  
Location and Support..................................................22  
6.1.1 Generator Location............................................22  
6.1.2 Generator Supports ..........................................22  
6.1.3 Suspended Mounting ........................................22  
6.1.4 Generator Restraint ..........................................23  
Generator Compartments ............................................23  
6.2.1 Compartment Size ............................................23  
6.2.2 Compartment Construction ..............................23  
6.2.3 Sound Insulating Materials................................24  
6.2.4 Acoustics ..........................................................24  
6.2.5 Compartment Floor Cutouts..............................25  
Cooling and Ventilation................................................26  
6.3.1 Generator Airflow ..............................................26  
6.3.2 Cooling Air Inlet Openings ................................26  
6.3.3 Compensating for Restrictions ..........................27  
6.3.4 Testing the Installation ......................................27  
Gasoline Fuel System ..................................................27  
6.4.1 Fuel Tank ..........................................................28  
6.4.2 Generator Fuel Supply Line ..............................28  
6.4.2.1 Rigid Fuel Lines..........................................28  
6.4.2.2 Flexible Fuel Lines......................................28  
LP Gas Fuel System ....................................................28  
6.5.1 Parts not included in Fuel System ....................28  
6.5.2 Some Important Considerations........................29  
6.5.3 Vapor Withdrawal ..............................................29  
6.5.4 Primary Regulator..............................................29  
6.5.5 Gaseous Carburetion ........................................29  
6.5.6 Fuel Supply Lines ..............................................30  
6.5.7 Excess Flow Valve..............................................30  
6.5.8 Leakage Tests ....................................................30  
Exhaust Systems..........................................................30  
6.6.1 Mufflers and Spark Arrestors............................31  
6.6.2 Type of Exhaust System ....................................31  
6.6.3 Exhaust System Safety ......................................31  
Electrical Connections ................................................31  
6.7.1 Electrical Junction Box ....................................31  
6.7.2 Wiring................................................................32  
6.7.3 Generator AC Connections ................................32  
6.7.4 Conduit..............................................................32  
6.7.5 Isolating Different Power Sources......................32  
6.7.6 Power Supply Cord............................................33  
6.7.7 Ground Fault Circuit Interrupters ....................33  
Battery Installation ......................................................34  
6.8.1 Recommended Battery ......................................34  
6.8.2 Battery Cables ..................................................34  
6.8.3 Battery Cable Connections ................................34  
6.8.4 Battery Compartment ........................................34  
Optional Accessories....................................................34  
6.9.1 Remote Panel Models ........................................35  
6.2  
Section 2 – Operation................................................................7  
6.3  
6.4  
6.5  
2.1  
Generator Control Panel ................................................7  
2.1.1 Fuel Primer..........................................................7  
2.1.2 Start/Stop Switch ................................................7  
2.1.3 15 Amp Fuse........................................................7  
2.1.4 Line Breakers ......................................................7  
Optional Remote Start/Stop Panel..................................8  
Automatic Choke ..........................................................8  
2.3.1 Choke Solenoid ..................................................8  
2.3.2 Prechoke..............................................................8  
Before Starting the Engine ............................................8  
2.4.1 Installation..............................................................8  
2.4.2 Engine Lubrication ................................................8  
2.4.3 Fuel Supply ............................................................8  
2.4.4 Cooling and Ventilating Air ....................................8  
2.4.5 Engine Exhaust Gas ..............................................9  
Starting the Generator ..................................................9  
Stopping the Generator..................................................9  
Applying Loads to Generator ........................................9  
2.7.1 Letting the Engine Stabilize ................................9  
2.7.2 Do Not Overload the Generator ........................10  
Protection Systems ......................................................10  
2.8.1 Low Oil Pressure Switch....................................10  
2.8.2 High Temperature Switch ..................................10  
2.8.3 Field Boost ........................................................10  
2.8.4 Overvoltage Protection ......................................11  
2.8.5 25-Hour Break-in Period....................................11  
2.8.6 25-Hour Checkup ..............................................11  
2.8.7 Operation in High Grass or Brush ....................11  
2.2  
2.3  
2.4  
2.5  
2.6  
2.7  
6.6  
6.7  
2.8  
Section 3 – Maintenance ........................................................11  
3.1  
3.2  
3.3  
Checking the Engine Oil Level......................................11  
Changing the Engine Oil and/or Oil Filter ....................12  
Maintaining the Engine Air Cleaner ............................12  
3.3.1 Cleaning the Foam Precleaner............................12  
Clean Air Intake Screen ..............................................13  
Checking the Engine Spark Plug..................................13  
Fuel Filter (Gasoline Only) ..........................................13  
Spark Arrestor Muffler ................................................13  
Cleaning the Generator................................................14  
Battery Maintenance ....................................................14  
3.9.1 Weekly ..............................................................14  
3.9.2 Every Six Months ..............................................14  
6.8  
6.9  
3.4  
3.5  
3.6  
3.7  
3.8  
3.9  
Section 7 — Post Installation ................................................35  
7.1  
7.2  
7.3  
7.4  
7.5  
Post Installation Tests..................................................35  
Before Initial Start-up ..................................................35  
Initial Start ..................................................................35  
Testing Under Load......................................................35  
Installation Checklist ..................................................36  
3.10 Major Service Manual ..................................................15  
3.11 Drive Belt ....................................................................15  
3.12 Exercising the Generator ............................................15  
3.13 Out of Service Procedure ............................................15  
3.13.1 Removal From Service ....................................15  
3.13.2 Return to Service ............................................15  
3.14 Wattage Reference Guide..............................................15  
Section 4 – Notes......................................................................16  
Section 8 – Troubleshooting ..................................................37  
8.1  
Troubleshooting Guide ................................................37  
Section 9 – Electrical Data......................................................38  
Section 10 – Exploded Views and Parts Lists....................40  
Section 11 – Notes....................................................................53  
Section 12 – Warranty ............................................................56  
®
Generac Power Systems, Inc.  
1
Download from Www.Somanuals.com. All Manuals Search And Download.  
Safety Rules  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
SAVE THESE INSTRUCTIONS – The manufacturer suggests that these rules for safe  
operation be copied and posted in potential hazard areas of the recreational vehicle.  
Safety should be stressed to all operators and potential operators of this equipment.  
GENERAL HAZARDS  
WARNING:  
contains chemicals known to the state  
of California to cause cancer, birth  
defects or other reproductive harm.  
The engine exhaust from this product  
• For safety reasons, Generac recommends  
that the installation, initial start-up and mainte-  
nance of this equipment is carried out by a  
Generac Authorized Service Dealer.  
• The engine exhaust fumes contain carbon monox-  
ide, which can be DEADLY. This dangerous gas, if  
breathed in sufficient concentrations, can cause  
unconsciousness or even death. This exhaust sys-  
tem must be installed properly, in strict compli-  
ance with applicable codes and standards.  
Following installation, you must do nothing that  
might render the system unsafe or in noncompli-  
ance with such codes and standards. The genera-  
tor compartment must be completely vapor sealed  
from the vehicle interior. There must be no possi-  
bility of exhaust fumes entering the vehicle interi-  
or. Never operate this equipment with a leaking or  
defective exhaust system.  
• Keep hands, feet, clothing, etc., away from drive  
belts, fans, and other moving or hot parts. Never  
remove any drive belt or fan guard while the unit is  
operating.  
• Adequate, unobstructed flow of cooling and venti-  
lating air is critical to correct generator operation  
and is required to expel toxic fumes and fuel  
vapors from the generator compartment. Without  
sufficient cooling airflow, the engine/generator  
quickly overheats, which causes serious damage to  
the generator. Do not alter the installation or per-  
mit even partial blockage of ventilation provisions,  
as this can seriously affect safe operation of the  
generator.  
WARNING:  
This product contains or emits chemicals  
known to the state of California to cause  
cancer, birth defects or other reproductive harm.  
Study these SAFETY RULES carefully before  
installing, operating or servicing this equipment.  
Become familiar with this manual and with the unit.  
The generator can operate safely, efficiently and reli-  
ably only if it is properly installed, operated and  
maintained. Many accidents are caused by failing to  
follow simple and fundamental rules or precautions.  
Generac cannot possibly anticipate every possible  
circumstance that might involve a hazard. The warn-  
ings in this manual, and on tags and decals  
affixed to the unit, are, therefore, not all-inclusive. If  
you use a procedure, work method or operating tech-  
nique Generac does not specifically recommend, you  
must satisfy yourself that it is safe for you and others.  
You also must make sure the procedure, work  
method or operating technique that you choose does  
not render the generator unsafe.  
Despite the safe design of this generator,  
operating this equipment imprudently, neglect-  
ing its maintenance or being careless can cause  
possible injury or death. Permit only responsi-  
ble and capable persons to operate or maintain  
this equipment.  
• When working on this equipment, remain alert at  
all times. Never work on the equipment when you  
are physically or mentally fatigued.  
• Inspect the generator regularly, and contact your  
nearest Generac Authorized Service Dealer imme-  
diately for parts needing repair or replacement.  
• Before performing any maintenance on the genera-  
tor, disconnect its battery cables to prevent acci-  
dental start up. Disconnect the cable from the bat-  
tery post indicated by a NEGATIVE, NEG or (–)  
first. Reconnect that cable last.  
• Never use the generator or any of its parts as a  
step. Stepping on the unit can stress and break  
parts, and may result in dangerous operating con-  
ditions from leaking exhaust gases, fuel leakage,  
oil leakage, etc.  
Potentially lethal voltages are generated by  
these machines. Ensure all steps are taken to  
render the machine safe before attempting to  
work on the generator.  
Parts of the generator are rotating and/or hot  
during operation. Exercise care near running  
generators.  
®
2
Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Safety Rules  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
ELECTRICAL HAZARDS  
FIRE HAZARDS  
• The generator covered by this manual produces  
dangerous electrical voltages and can cause fatal  
electrical shock. Avoid contact with bare wires, ter-  
minals, connections, etc., while the unit is running.  
Ensure all appropriate covers, guards and barriers  
are in place before operating the generator. If you  
must work around an operating unit, stand on an  
insulated, dry surface to reduce shock hazard.  
• Do not handle any kind of electrical device while  
standing in water, while barefoot, or while hands  
or feet are wet. DANGEROUS ELECTRICAL  
SHOCK MAY RESULT.  
• During installation onto the vehicle, have the gen-  
erator properly grounded (bonded) either by solid  
mounting to the vehicle frame or chassis, or by  
means of an approved bonding conductor. DO  
NOT disconnect the bonding conductor, if so  
equipped. DO NOT reconnect the bonding conduc-  
tor to any generator part that might be removed or  
disassembled during routine maintenance. If the  
grounding conductor must be replaced, use only a  
flexible conductor that is of No. 8 American Wire  
Gauge (AWG) copper wire minimum.  
For fire safety, the generator must be installed and  
maintained properly. Installation always must  
comply with applicable codes, standards, laws and  
regulations. Adhere strictly to local, state and  
national electrical and building codes. Comply  
with regulations the Occupational Safety and  
Health Administration (OSHA) has established.  
Also, ensure that the generator is installed in  
accordance with the manufacturer’s instructions  
and recommendations. Following proper installa-  
tion, do nothing that might alter a safe installation  
and render the unit in noncompliance with the  
aforementioned codes, standards, laws and regu-  
lations.  
• Keep a fire extinguisher in the vehicle at all times.  
Extinguishers rated ABC” by the National Fire  
Protection Association are appropriate for use on  
the recreational vehicle generator electrical sys-  
tem. Keep the extinguisher properly charged and  
be familiar with its use. If you have any question  
pertaining to fire extinguishers, consult your local  
fire department.  
• In case of accident caused by electric shock, imme-  
diately shut down the source of electrical power. If  
this is not possible, attempt to free the victim from  
the live conductor. AVOID DIRECT CONTACT  
WITH THE VICTIM. Use a nonconducting imple-  
ment, such as a rope or board, to free the victim  
from the live conductor. If the victim is uncon-  
scious, apply first aid and get immediate medical  
help.  
• Never wear jewelry when working on this equip-  
ment. Jewelry can conduct electricity resulting in  
electric shock, or may get caught in moving com-  
ponents causing injury.  
EXPLOSION HAZARDS  
• Do not smoke around the generator. Wipe up any  
fuel or oil spills immediately. Ensure that no com-  
bustible materials are left in the generator com-  
partment, or on or near the generator, as FIRE or  
EXPLOSION may result. Keep the area surround-  
ing the generator clean and free from debris.  
• Gasoline is extremely FLAMMABLE and its vapors  
are EXPLOSIVE. Do not permit smoking, open  
flame, sparks or any source of heat in the vicinity  
while handling gasoline. Comply with all laws gov-  
erning the storage and handling of gasoline.  
• This generator may use liquid propane (LP) gas as  
a fuel. LP gas is highly EXPLOSIVE. The gas is  
heavier than air and tends to settle in low areas  
where even the slightest spark can ignite the gas  
and cause an explosion.  
®
Generac Power Systems, Inc.  
3
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 1 – General Information  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
1.1 GENERATOR IDENTIFICATION  
Please record the following information from the generator DATA DECAL or information decal.  
1. Model Number ____________________  
3. kW Rating__________________________  
5. Phase ______________________________  
2. Serial Number __________________  
4. Rated Voltage __________________  
6. Hertz __________________________  
1
3
2
4
5
6
7
14  
9
10  
11  
12  
13  
8
REFERENCE NUMBER IDENTIFICATION  
1. Generator Air Intake Screen  
2. Data Plate  
8. Starter Contactor  
9. Fuel Inlet  
3. Engine Start/Stop Switch  
4. 15 amp Fuse  
10. Fuel Primer Switch  
11. Fuel Pump  
5. 30 amp Circuit Breaker  
6. Optional Remote Panel Receptacle  
7. Generator AC Output Leads  
12. Oil Filter  
13. Oil Drain Plug  
14. Oil Dipstick and Filler Tube  
®
4
Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 1 – General Information  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
1.2 GENERATOR APPLICABILITY  
1.3 INSTALLATION  
These generators have been designed and manufac-  
tured for supplying electrical power for recreational  
vehicles. You should not modify the generator or use  
it for any application other than for what it was  
designed. If there are any questions pertaining to its  
application, write or call the factory. Do not use the  
unit until you have been advised by competent  
authority.  
This Owner’s Manual has been prepared under the  
assumption that a competent, qualified technician  
installed the generator into an industrial vehicle. We  
also assume the installer complied with all applicable  
codes, standards and regulations pertaining to instal-  
lation.  
An INSTALLATION MANUAL was shipped with the  
generator. That Manual contains manufacturer’s  
instructions and recommendations for installing the  
unit into an industrial vehicle. After installation,  
installers should forward the Installation Manual to  
Owners/Operators for their information.  
For fire safety, the generator must have been  
properly installed in compliance with ANSI  
119.2-1975/NFPA 501C-1974, “Standard for  
Recreational Vehicles, Part III – Installation of  
Electrical Systems.” The generator also must  
have been installed in strict compliance with  
the manufacturer’s detailed installation instruc-  
tions. After installation, do nothing that might  
render the unit in noncompliance with such  
codes, standards and instructions.  
Owners/Operators have the responsibility to make  
sure that nothing is done that might render the instal-  
lation unsafe or in non-compliance with applicable  
codes, standards and instructions.  
1.4 SAFETY  
Before using the generator set, carefully read GEN-  
ERAL SAFETY RULES inside the cover. Comply with  
these RULES to prevent accidents and damage to  
equipment and/or property. Generac suggests copy-  
ing and posting the GENERAL SAFETY RULES to  
potential operators of this equipment.  
You can use your generator set to supply electrical  
power for operating one of the following electrical  
loads:  
• PRIMEPACT 66G: 120 and/or 240 volts, single  
phase, 60 Hz electrical loads. These loads can  
require up to 6600 watts (6.6 kW) of power, but  
cannot exceed 55 AC amperes of current at 120  
volts or exceed 27.5 AC amperes at 240 volts.  
• PRIMEPACT 66LP: 120 and/or 240 volts, single  
phase, 60 Hz electrical loads. These loads can  
require up to 6200 watts (6.2 kW) of power, but  
cannot exceed 51.7 AC amperes of current at 120  
volts or exceed 25.8 AC amperes at 240 volts.  
1.5 GENERATOR AC CONNECTION  
SYSTEM  
These air-cooled generator sets are equipped with  
dual stator AC power windings. These two stator  
windings supply electrical power to customer electri-  
cal loads by means of a dual 2-wire connection sys-  
tem.  
Generators may be installed to provide the following  
outputs:  
1) 120 VAC loads only — one load with a maximum  
total wattage requirement equal to the generator’s  
rated power output (in watts), and 120V across the  
generator output terminals. Figure 1.1, page 6,  
shows the generator lead wire connections for  
120VAC ONLY.  
Do not overload the generator. Some installa-  
tions may require that electrical loads be alter-  
nated to avoid overloading. Applying exces-  
sively high electrical loads may damage the  
generator and may shorten its life. Add up the  
rated watts of all electrical lighting, appliance,  
tool and motor loads the generator will power  
at one time. This total should not be greater  
than the wattage capacity of the generator. If  
an electrical device nameplate gives only volts  
and amps, multiply volts times amps to obtain  
watts (volts x amps = watts). Some electric  
motors require more watts of power (or amps  
of current) for starting than for continuous  
operation.  
2) 120/240 VAC loads — one load with a maximum  
total wattage requirement equal to the generator’s  
rated power output, and 240V across the generator  
output terminals; or two seperate loads, each with a  
maximum total wattage requirement equal to half of  
the generator’s rated power output (in watts), and  
120V across the generator output terminals.  
Figure 1.2, page 6, shows the generator lead wire  
connections for 120/240 VAC loads.  
®
Generac Power Systems, Inc.  
5
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 1 – General Information  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Figure 1.1 – Connection for 120 Volts Only  
Fuel Consumption (gph/lbs.ph)  
Model  
No Load  
0.33  
1/2 Load  
0.59  
Full Load  
0.99  
1.66/7.05  
PrimePact 66G  
PrimePact 66LP  
0.47/2.01  
0.85/3.62  
NOTE  
Some installations using a “shared” fuel tank may  
have a generator fuel pickup tube that is shorter  
than the vehicle engine’s pickup tube. Such an  
arrangement causes the generator engine to “run  
out of gas” while adequate fuel for the vehicle  
remains in the tank.  
To reduce lead and carbon deposits use high quality  
UNLEADED gasoline with the generator. Leaded  
REGULAR grade gasoline is an acceptable substitute.  
NOTE:  
Figure 1.2 - Connection for 120/240 Volts  
Using unleaded gasoline contributes to longer engine  
valve life by reducing lead and carbon deposits.  
T1  
RED  
CB1  
Generac does not recommend using any  
gasoline containing alcohol (such as “gasohol”).  
If you use any gasoline containing alcohol, it  
must not contain more than 10 percent ethanol,  
and it must be removed from the generator  
during storage. Do NOT use any gasoline  
containing methanol. If you use gasoline with  
alcohol, inspect more frequently for fuel leaks  
and other abnormalities.  
T2  
WHITE  
CB2  
T3  
1.6.2 ENGINE OIL REQUIREMENTS  
N
BLACK  
GROUNDED NEUTRAL  
STATOR WINDINGS  
Use only high quality detergent oil classified “For  
Service SF” and with an oil viscosity rating of SAE  
10W-30 oil. Do not pour in any additives to the rec-  
ommended oil. Engine crankcase capacity is 1.4  
liters. See Section 3.2 on page 11 for oil level check  
and filing procedures.  
1.6 SPECIFICATIONS  
1.6.1 FUEL REQUIREMENTS  
N
This generator is equipped with a gasoline fuel system  
as standard equipment. Specific installations may pro-  
vide either a separate fuel tank for the generator, or the  
generator may “share” the vehicle engine’s fuel tank.  
N
1.6.3 GENERATOR SPECIFICATIONS  
PRIMEPACT 66G  
SERIES  
Rotor RPM  
PRIMEPACT 66LP  
3600  
3600  
2
Rotor Poles  
Engine RPM  
2
2700  
2700  
6600 watts (6.6 kW)  
120  
Rated Max. Continuous AC Output*  
Voltage*  
6200 watts (6.2 kW)  
120  
Rated Max. Continuous Current*  
Phase  
55.0 AC amps‡  
1
60 Hertz  
51.7 AC amps Ñ  
1
60 Hertz  
Frequency  
Battery Charging Current (Max.)  
2 amps (trickle charge)  
213 pounds  
25 inches  
2 amps (trickle charge)  
216 pounds  
25.75 inches  
18.5 inches  
15.75 inches  
Weight  
Length  
Width  
18.5 inches  
15.75 inches  
Height  
*
Ñ
All units are reconnectable to 120 and/or 240 volts, dual voltage output. Units are not listed per RVIA/ANSI when reconnected for dual voltage output  
Rated maximum continuous current at 240 volts is 27.5 amps.  
Rated maximum continuous current at 240 volts is 25.8 amps.  
®
6
Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 2 – Operation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
1.6.4 ENGINE SPECIFICATIONS  
Type of Engine  
PRIMEPACT 66G/66LP ..............................................GN-480  
N
2.1 GENERATOR CONTROL PANEL  
The following features are mounted on the generator  
control panel (Figure 2.1):  
Cooling Method ........................................................Air-cooled  
Rated Horsepower  
2.1.1 FUEL PRIMER  
N
PRIMEPACT 66G/66LP ........................................16 at 3600  
Displacement  
PRIMEPACT 66G/66LP..................................................480cc  
Before starting a cold engine (if it has not been start-  
ed in more than two weeks), you must press this  
switch for approximately ten seconds to bring fuel  
from the tank to the fuel pump. This rocker type  
switch springs back into its original position when  
you release it.  
Compression Ratio........................................................8.6 to 1  
Cylinder Block ..........................Aluminum w/Cast Iron Sleeve  
Type of Governor ..............................Mechanical, Fixed Speed  
Engine Governor Speed............................................2700 rpm  
Air Cleaner ........................Paper Element w/Foam Precleaner  
Starter ........................................................12-volt DC Electric  
Ignition System ......................Solid-state w/Flywheel Magneto  
Recommended Spark Plug  
Champion ..................................................................RC12YC  
AC....................................................................................R45S  
Fram Autolite ......................................................................65  
Spark Plug Gap........................................0.030 inch (0.8 mm)  
Recommended Min. Battery............400 Cold Cranking Amps  
2.1.2 START/STOP SWITCH  
N
To crank and start the engine, hold this switch in the  
START position. Release the switch when the engine  
starts. To stop an operating engine, press and hold  
the switch in the STOP position until the engine shuts  
off. The switch center position is the RUN position.  
2.1.3 15 AMP FUSE  
N
The fuse protects the engine’s DC control circuit  
against electrical overload. If the fuse element has  
melted open due to overloading, the engine cannot be  
cranked. If you must replace the fuse, use only an  
identical 15 amp replacement fuse.  
1.6.5 EMISSIONS COMPLIANCE PERIOD  
N
For nonhandled engines the Emissions Compliance  
Period referred to on the Emissions Compliance  
Label indicates the number of operating hours for  
which the engine has been shown to meet Federal  
emission requirements.  
2.1.4 LINE BREAKERS  
N
Protects generator’s AC output circiut against  
overload, i.e., prevents unit from exceeding  
wattage/amperage capacity. This unit has two 30-amp  
breakers.  
• For engines less than 225 cc displacement,  
Category C=125 hours, B=250 hours, and A=500  
hours.  
For engines of 225 cc or more, Category C=250  
Figure 2.1 – Typical Control Panel  
hours, B=500 hours, and A=1000 hours.  
®
Generac Power Systems, Inc.  
7
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 2 – Operation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
NOTE:  
2.3.2 PRECHOKE  
N
If this generator has been reconnected for dual  
voltage AC output (120/240 volts), you can install  
line breakers having an amperage rating that is  
different than that stated above. The replacement  
line breakers consist of two separate breakers with  
a connecting piece between the breaker handles  
(so that both breakers will operate at the same  
time). If the unit is reconnected for dual voltage,  
it is no longer RVIA listed.  
The choke system also has a temperature-sensitive  
metal strip that adjusts choke valve angle according  
to ambient temperatures (i.e., in cold ambient tem-  
peratures, choke valve closes more). Once the engine  
starts, an element heats the temperature-sensitive  
strip to a normal operating condition, opening the  
choke valve. This may take about three minutes in  
cooler weather.  
2.4 BEFORE STARTING THE ENGINE  
2.2 OPTIONAL REMOTE  
NOTE:  
START/STOP PANEL  
Instructions and information in this manual  
assume the generator has been properly installed,  
connected, serviced, tested and adjusted by a  
qualified installation technician or installation  
contractor.  
A remote mounted Start/Stop Panel (Figure 2.2) is  
available that allows you to start and stop the gener-  
ator engine conveniently from inside the vehicle. The  
remote panel includes a Start/Stop switch, hourme-  
ter, generator run lamp and a wire harness.  
2.4.1 INSTALLATION  
N
Figure 2.2 — Optional Remote Panel  
(Models 004057 and 004184)  
Generator installation must have been properly com-  
pleted so it complies with all applicable codes, stan-  
dards and regulations and with the manufacturer's  
recommendations.  
2.4.2 ENGINE LUBRICATION  
N
Have the engine crankcase properly serviced with the  
recommended oil before starting. Refer to Section  
1.6.3 (Page 6) and Sections 3.1 and 3.2 (Page 11) for  
oil servicing procedures and recommendations.  
2.3 AUTOMATIC CHOKE  
This engine is equipped with an automatic choke that  
consists of two main components: a choke solenoid  
and prechoke.  
Any attempt to crank or start the engine before  
you have properly serviced it with the recom-  
mended oil may result in an engine failure.  
2.4.3 FUEL SUPPLY  
N
2.3.1 CHOKE SOLENOID  
N
The engine must have an adequate supply of proper  
fuel to operate. Before starting it, check that sufficient  
fuel is available.  
During engine cranking (Start/Stop switch at  
START), a solid-state choke module signals the  
choke solenoid to activate and cycle (choke on/choke  
off) until the engine starts. The choke solenoid thus  
opens and closes the carburetor choke valve only  
when the engine is cranking. When the engine starts,  
the choke stops cycling.  
NOTE:  
Depending on the installation, the generator may  
have either a separate fuel tank, or it may “share”  
the vehicle engine’s fuel tank.  
2.4.4 COOLING AND VENTILATING AIR  
N
Air inlet and outlet openings in the generator com-  
partment must be open and unobstructed for contin-  
ued proper operation. Without sufficient cooling and  
ventilating airflow, the engine/generator quickly over-  
heats, which causes it to shut down and may damage  
the generator.  
®
8
Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 2 – Operation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
2. If you have not started the engine in more than  
2.4.5 ENGINE EXHAUST GAS  
N
two weeks, press the Fuel Pump Primer switch  
and hold it for about 10 seconds. However, if the  
engine is warm, skip Step 2.  
Before starting the generator engine, you should be  
sure there is no way for exhaust gases to enter the  
vehicle interior and endanger people or animals.  
Close windows, doors and other openings in the vehi-  
cle that, if open, might permit exhaust gases to enter  
the vehicle.  
3. To crank and start the engine, hold the start/stop  
switch at START. Release the switch when the  
engine starts.  
If the engine does not start after it has been  
cranking for 15 seconds, release the Start/Stop  
switch and wait 1 minute before trying again.  
Holding the switch for longer than 15 seconds  
can damage the starter motor.  
The generator engine gives off DEADLY carbon  
monoxide gas through its exhaust system. This  
dangerous gas, if breathed in sufficient concen-  
trations, can cause unconsciousness or even  
death. Never operate the generator set with  
the vehicle inside any garage or other enclosed  
area. DO NOT OPERATE THE GENERATOR IF THE  
EXHAUST SYSTEM IS LEAKING OR HAS BEEN  
DAMAGED. SYMPTOMS OF CARBON MONOX-  
IDE POISONING ARE (a) inability to think coher-  
ently; (b) vomiting; (c) twitching muscles; (d)  
throbbing temples; (e) dizziness; (f) headaches;  
(g) weakness; and (h) sleepiness. IF YOU FEEL  
ANY OF THESE SYMPTOMS, MOVE INTO FRESH  
AIR IMMEDIATELY. IF SYMPTOMS PERSIST, GET  
MEDICAL HELP.  
4. Let the engine run at no-load for a few minutes to  
stabilize and warm up.  
5. Turn ON electrical loads using the means  
provided (such as a main circuit breaker or  
transfer switch).  
2.6 STOPPING THE GENERATOR  
1. Turn OFF all electrical loads using the means  
provided (such as a main circuit breaker or  
transfer switch).  
2. Let generator run at no-load for a few minutes, to  
stabilize internal engine generator temperatures.  
3. Place the Start/Stop switch in its STOP position.  
The engine will come to a complete stop.  
2.5 STARTING THE GENERATOR  
NOTE:  
Read the vehicle manufacturer’s instructions. The  
owner/operator should become familiar with the  
vehicle in which this generator is installed.  
Differences exist between vehicles. For example,  
some vehicles may use a transfer switch to isolate  
dockside power from the generator, while other  
vehicles may use an isolating receptacle. Some  
vehicles may be equipped with a DC converter  
which allows the generator to power certain DC  
lighting and other DC loads.  
2.7 APPLYING LOADS TO GENERATOR  
When applying electrical loads to the generator,  
observe these guidelines:  
• Before applying electrical loads, let the generator  
stabilize and warm up for a minute or two.  
• DO NOT overload the generator.  
2.7.1 LETTING THE ENGINE STABILIZE  
N
The generator supplies correct rated voltage only at  
the proper governed speed. Some electrical appli-  
ances may be extremely sensitive to voltage. Incorrect  
voltages can damage such appliances.  
To crank and start the generator engine, proceed as  
follows:  
1. Turn OFF electrical loads using the means pro-  
vided in your vehicle (such as a main line circuit  
breaker or transfer switch).  
If electrical loads are applied at reduced operating  
speeds, such loads imposed on the engine when suf-  
ficient power is not available may shorten engine life.  
Never turn ON electrical loads until after the genera-  
tor engine has started and stabilized at no-load.  
NOTE:  
If starting from the generator control panel, turn  
OFF loads by setting the generator’s main circuit  
breaker to the OFF (or open) position. If starting  
from a remote panel, turn OFF loads using the  
means provided in the vehicle (such as a main cir-  
cuit breaker). Electrical load circuits will be  
turned ON after the generator has started, stabi-  
lized and warmed up.  
®
Generac Power Systems, Inc.  
9
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 2 – Operation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
2.7.2 DO NOT OVERLOAD THE GENERATOR  
2.8.2 HIGH TEMPERATURE SWITCH  
N
N
You can read the rated wattage/amperage capacity of  
your generator on the generator data decal (see  
Section 1.1 on Page 4).  
This switch (Figure 2.3), which has normally open  
(N.O.) contacts, is mounted near the oil filter. The  
contacts close if the temperature should exceed  
approximately 284º F (140º C), initiating an engine  
shutdown.  
Applying electrical loads in excess of the unit’s rated  
capacity will cause the engine/generator to automati-  
cally shut down.  
Figure 2.3 – Low Oil Pressure and  
High Temperature Switches  
To avoid overloading, add up the wattage of all con-  
nected electrical lighting, appliance, tool and motor  
loads. This total should not be greater than the gen-  
erator’s rated wattage capacity.  
• Most lighting, appliance, tool and motor loads indi-  
cate their required watts on their nameplate or  
data plate. For light bulbs, simply note the wattage  
rating of the bulb.  
• If a load does not show its rated wattage, multiply  
that load’s rated VOLTS times AMPS to obtain  
WATTS.  
• Induction type motors (such as those that run the  
vehicle’s furnace fan, refrigerator, air conditioner,  
etc.) need about 2-1/2 times more watts of power  
for starting than for running (for a few seconds  
during motor starting). Be sure to allow for this  
when connecting electrical loads to the generator.  
First, figure the watts needed to start electric  
motors in the system. To that figure, add the run-  
ning wattages of other items that will be operated  
by the generator.  
2.8.3 FIELD BOOST  
N
The Controller Circuit Board houses a field boost  
diode and resistor that are not part of the automatic  
choke circuit. These two components are part of a  
“field boost” circuit (Figure 2.4). During engine  
cranking only, a positive DC (battery) voltage is deliv-  
ered through the diode, resistor, brushes and slip  
rings, and the generator rotor. Application of this  
voltage to the rotor “flashes the field” whenever it is  
started. Flashing of the field each time the generator  
starts makes sure that a sufficiently strong magnetic  
field is available to produce “pickup” voltage in the  
stator windings.  
• Do not apply heavy electrical loads for the first two  
or three hours of operation.  
2.8 PROTECTION SYSTEMS  
2.8.1 LOW OIL PRESSURE SWITCH  
N
This switch (Figure 2.3 on page 10) has normally  
open (N.O.) contacts that are held open by engine oil  
pressure during cranking and operating. Should oil  
pressure drop below a preset level, switch contacts  
close, and the engine automatically shuts down. The  
unit should not be restarted until oil is added.  
Figure 2.4 – Field Boost Circuit  
®
10 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 3 – Maintenance  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
2.8.4 OVERVOLTAGE PROTECTION  
2.8.6 25-HOUR CHECK-UP  
N
N
A solid-state voltage regulator (Figure 2.5) controls  
the generator’s AC output voltage. This regulator sup-  
plies an excitation current to the rotor. By regulating  
the rotor’s excitation current, the strength of its mag-  
netic field is regulated and, in turn, the voltage deliv-  
ered to connected electrical loads is controlled. When  
the AC frequency is 50 Hertz, voltage is regulated at  
115 volts.  
After the 25-hour break-in period, contact a Generac  
Authorized Service Dealer for the following mainte-  
nance. The vehicle owner is responsible for any  
charges:  
• Change the engine crankcase oil and oil filter.  
• Check all fluid levels.  
• Inspect the cooling and ventilation openings.  
• Check the engine ignition system.  
• Inspect the entire electrical system.  
• Inspect the engine exhaust system.  
Figure 2.5 – Solid State Voltage Regulator  
2.8.7 OPERATION IN HIGH GRASS  
N
OR BRUSH  
Never operate the generator while the vehicle  
is parked over high grass, weeds, brush,  
leaves or any other combustible substance.  
Such materials can ignite and burn from the  
heat of the exhaust system. The generator  
exhaust system becomes extremely hot dur-  
ing operation and remains hot for a long time  
after it has shut down.  
The voltage regulator also incorporates a “voltage  
surge protection circuit.” This circuit prevents trou-  
blesome surges in the generator AC output voltage.  
Voltage surge is a common cause of damage to elec-  
tronic equipment.  
3.1 CHECKING THE ENGINE OIL  
LEVEL  
For oil capacities and requirements, see “Engine Oil  
Requirements,” Section 1.6.2 (Page 6). Check the  
engine crankcase oil level at least every eight hours of  
operation, or before you use it. To check the engine  
oil level, proceed as follows (see Figure 3.1):  
2.8.5 25-HOUR BREAK-IN PERIOD  
N
The first 25 hours of operation is the break-in period  
for the generator. Properly breaking in the generator  
is essential to minimize fuel consumption and pro-  
vide maximum engine performance. During this 25-  
hour break-in period, follow this procedure:  
1. Be sure the generator is as level as possible.  
2. Remove the dipstick and wipe it dry with a clean,  
lint-free cloth.  
3. Install and tighten the dipstick cap; then, remove  
it again. The oil level should be at the dipstick  
Full” mark.  
4. If necessary, remove the oil fill cap on the rocker  
cover and slowly add oil until it reaches the dip-  
stick “Full” mark. DO NOT FILL ABOVE THE  
“FULLMARK.  
• Run the unit at varying electrical loads to help seat  
the engine piston rings properly.  
• Check the engine oil level frequently. Add oil if  
needed. It is normal for the generator engine to  
consume more oil than is normal until the piston  
rings have properly seated.  
For the 75-hour operation following the break-in  
period, avoid light electrical loads. Load the  
generator at 50 percent (or more) of its rated  
wattage capacity. Repeated light loads during these  
75 hours can cause improper seating of engine pis-  
ton rings, resulting in blowby and high oil con-  
sumption.  
Never operate the engine with the oil level  
below the “Add” mark on the dipstick. Doing  
this could damage the engine.  
• After operating the unit for 25 hours, complete the  
5. Install and tighten the oil fill cap and the dipstick  
before operating the engine.  
tasks recommended under Section 2.8.6.  
®
Generac Power Systems, Inc. 11  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 3 – Maintenance  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Figure 3.1 — Oil Dipstick/Fill Tube and  
Location of Oil Drain Plug  
3.2 CHANGING THE ENGINE OIL  
AND/OR OIL FILTER  
• Change the engine oil after the first 25 hours of  
operation (after the 25-hour break-in period, see  
Section 2.8.5, Page 10). Thereafter, change the  
oil every 100 operating hours. Change the oil more  
frequently if operating consistently under heavy  
load or at high ambient temperatures.  
• Change the engine oil filter after the first 25 hours  
of operation, and every 100 operating hours there-  
after.  
OIL DIPSTICK  
To change the oil and/or oil filter, proceed as  
follows:  
1. Run the engine until it is thoroughly warmed up  
(at least five minutes) then shut OFF  
the engine.  
2. With the engine still warm from running, remove  
the oil drain plug (Figure 3.1). Drain the oil into  
a suitable container.  
OIL DRAIN PLUG  
Figure 3.2 — Engine Oil Filter  
3. After the oil has drained, replace the oil drain  
plug. (If only changing the oil, go to step 7.)  
4. With the oil drained, remove the old oil filter by  
turning it counterclockwise (Figure 3.2 on page 12).  
5. Apply a light coating of clean engine oil to the gas-  
ket of the new filter.  
6. Screw the new filter on by hand until its gasket  
lightly contacts the oil filter adapter. Then, tight-  
en the filter an additional 3/4 to one turn.  
7. Remove the dipstick and fill crankcase with the  
proper type and amount of recommended oil (see  
Section 1.6.2, Page 6). The engine crankcase can  
hold about 1.4 liters. DO NOT FILL ABOVE THE  
“FULLMARK.  
3.3 MAINTAINING THE ENGINE  
AIR CLEANER  
8. Install and tighten the dipstick before operating  
the engine.  
3.3.1 CLEANING THE FOAM PRECLEANER  
N
9. Start the engine and check for leaks.  
Clean and re-oil the foam precleaner every three  
months or every 25 hours of operation, whichever  
occurs first. Service the foam precleaner more fre-  
quently if operating the generator in extremely dusty  
or dirty conditions. Use the following procedure  
(Figure 3.3):  
NOTE:  
Check the oil level and fill to the “FULLmark after  
checking for leaks. The filter will retain some oil.  
1. Turn the knob counterclockwise to loosen.  
2. Remove the cover, foam precleaner and paper fil-  
ter.  
3. Remove the foam precleaner from the cover.  
4. Wash the foam precleaner in liquid detergent and  
water.  
5. Wrap the foam precleaner in a clean cloth and  
gently squeeze it dry.  
6. Saturate the foam precleaner in clean engine oil.  
Gently squeeze it in a clean cloth to remove  
excess oil and to distribute oil (DO NOT TWIST).  
7. Install the foam precleaner into the cover, fol-  
lowed by the paper filter. Tabs at edges of paper  
®
12 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 3 – Maintenance  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
filter must lock into slots on cover.  
8. Install the cover, foam precleaner and paper filter.  
9. Replace knob to retain the filter in place.  
Figure 3.5 – Setting the Spark Plug Gap  
Figure 3.3 – Engine Air Cleaner  
PAPER  
FOAM  
FILTER  
PRE-CLEANER  
KNOB  
Sparking can occur if the wire terminal does  
not fit firmly on the spark plug terminal end. If  
necessary, re-form the wire terminal to obtain a  
tight fit.  
COVER  
3.6 FUEL FILTER (GASOLINE ONLY)  
Remove and replace the fuel filter (Figure 3.6)  
once each year or every 100 hours of operation,  
whichever comes first.  
3.4 CLEAN AIR INTAKE SCREEN  
Clean all foreign material from the air intake screen  
(Figure 3.4) at least once every 100 hours of opera-  
tion. Clean more often if necessary.  
Figure 3.6 – Fuel Filter  
Inspect the area around the generator exhaust muf-  
fler periodically and remove all grass, leaves, dirt,  
etc., from this area.  
FUEL FILTER  
TO FUEL PUMP  
Figure 3.4 – Cleaning Air Intake  
CUSTOMER FUEL CONNECTION  
3.7 SPARK ARRESTOR MUFFLER  
If the generator is not equipped with a spark arrestor  
exhaust muffler and is to be used on any forest cov-  
ered, brush covered or grass covered unimproved  
land, you may have to install a spark arrestor. The  
spark arrestor must be maintained in effective work-  
ing order by the vehicle owner/operator.  
3.5 CHECKING THE ENGINE  
SPARK PLUG  
Clean the spark plug and reset the spark plug gap  
every 100 hours of operation.  
1. Clean the area around the base of the spark plug  
to keep dirt and debris out of the engine. Clean by  
scraping or washing using a wire brush and com-  
mercial solvent. Do not blast the spark plug to  
clean.  
2. Remove the spark plug and check the condition.  
Replace the spark plug if worn or if reuse is ques-  
tionable.  
3. Check the spark plug gap using a wire feeler  
gauge. Adjust the gap to 0.030 inch (0.76 mm)  
by carefully bending the ground electrode  
(Figure 3.5).  
For assistance in ordering, installing and maintaining  
spark arrestor exhaust mufflers, contact your nearest  
Generac Authorized Service Dealer.  
Exhaust mufflers supplied by Generac are spark  
arrestor types. Generac exhaust mufflers for recre-  
ational vehicle generators do not have a spark  
arrestor screen, but are of the more efficient “toroid”  
or “swirl” type. To remove carbon and combustion  
deposits from such mufflers, remove the plug from  
the muffler and run the engine for approximately 15  
minutes. Shut down the engine, let the muffler cool  
and install the plug.  
®
Generac Power Systems, Inc. 13  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 3 – Maintenance  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Damage will result if the battery connections are  
made in reverse.  
Be sure to reinstall the muffler plug tightly.  
Engine vibration could cause a loose plug to  
fall out. Without the plug in place, hot engine  
exhaust is directed out the opening. This hot  
exhaust, depending on the installation, could  
be directed to areas not able to withstand the  
extreme heat such as wooden floor boards or  
other flammable material. This could result in a  
fire.  
Do not dispose of the battery in a fire. The  
battery is capable of exploding. Storage batter-  
ies give off explosive hydrogen gas. This gas  
can form an explosive mixture around the bat-  
tery for several hours after charging. The  
slightest spark can ignite the gas and cause an  
explosion. Such an explosion can shatter the  
battery and cause blindness or other injury.  
Any area that houses a storage battery must be  
properly ventilated. Do not allow smoking,  
open flame, sparks, or any spark producing  
tools or equipment near the battery. Discharge  
static electricity from your body before touch-  
ing the battery by first touching a grounded  
metal surface.  
3.8 CLEANING THE GENERATOR  
Keep the generator set as clean and dry as possible.  
Protect the unit against excessive dust, dirt, corrosive  
vapors, road splash, etc. Permitting dirt and mois-  
ture to accumulate on generator windings will have  
an adverse effect on the insulation resistance of those  
windings.  
When moisture is allowed to remain in contact with  
windings, some of the moisture will be retained in  
voids and cracks in the insulation. This causes a  
reduced insulation resistance and will eventually  
cause problems. Dirt will make the problem worse,  
since dirt tends to hold moisture in contact with  
windings. Salt (as from sea air) also will worsen the  
problem since it tends to absorb moisture from the  
air. Salt and moisture, when combined, form a good  
electrical conductor.  
A battery presents a risk of electrical shock  
and high short circuit current. The following  
precautions are to be observed when working  
on batteries:  
• Remove watches, rings or other metal objects;  
• Use tools with insulated handles;  
• Wear rubber gloves and boots;  
• Do not lay tools or metal parts on top of the  
battery;  
• Disconnect any charging source prior to connecting  
or disconnecting battery terminals; and  
• Do not use any jumper cables or booster battery to  
crank and start the generator engine. If any battery  
has discharged, remove it for recharging.  
Do NOT use a forceful spray of water to clean  
the generator. Water will enter the generator  
interior and cause problems, and may also cont-  
aminate the generator fuel system.  
Do not open or mutilate the battery. Released  
electrolyte has been known to be harmful to  
the skin and eyes, and to be toxic.  
3.9 BATTERY MAINTENANCE  
All lead-acid batteries will discharge when not in use.  
The generator battery should be inspected as follows:  
The electrolyte is a dilute sulfuric acid that is  
harmful to the skin and eyes. It is electrically  
conductive and corrosive. The following  
procedures are to be observed:  
3.9.1 WEEKLY  
N
• Inspect the battery posts and cables for tightness  
and corrosion. Tighten and clean as necessary.  
• Check the battery fluid level of unsealed batteries  
and, if necessary, fill with Distilled Water Only. Do  
not use tap water in batteries.  
• Wear full eye protection and protective clothing;  
• Where electrolyte contacts the skin, wash it off  
immediately with water;  
• Where electrolyte contacts the eyes, flush  
thoroughly and immediately with water and seek  
medical attention; and  
• Spilled electrolyte is to be washed down with an  
acid neutralizing agent. A common practice is to  
use a solution of 1 pound (500 grams) bicarbonate  
of soda to 1 gallon (4 liters) or water. The bicar-  
bonate of soda solution is to be added until the  
evidence of reaction (foaming) has ceased. The  
resulting liquid is to be flushed with water and the  
area dried.  
3.9.2 EVERY SIX MONTHS  
• Have the state of charge and condition checked.  
This should be done with an automotive-type bat-  
tery hydrometer.  
N
NOTE:  
Servicing of the battery is to be performed or  
supervised by personnel knowledgeable of batter-  
ies and the required precautions. Keep unautho-  
rized personnel away from batteries.  
®
14 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 3 – Maintenance  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
2. Check the state of the battery. Fill all cells of  
3.10 MAJOR SERVICE MANUAL  
To obtain a service manual for your generator, con-  
tact Generac or your nearest Generac Authorized  
Service Dealer. Make sure to identify your MODEL  
NUMBER and SERIES.  
unsealed batteries to the proper level with distilled  
water. DO NOT USE TAP WATER IN THE BAT-  
TERY. Recharge the battery to 100 percent state of  
charge, or, if defective, replace the battery.  
3. Clean and wipe the entire generator.  
4. Reconnect the battery. Observe battery polarity.  
Damage may occur if the battery is connected  
incorrectly.  
3.11 DRIVE BELT  
The engine drives the generator rotor by means of a  
pulley and drive belt arrangement. The drive belt and  
pulleys are warranted for the life of the generator.  
Drive belt tension was properly adjusted before the  
unit was shipped from the factory. If you suspect that  
drive belt tension is incorrect, contact a Generac  
Authorized Service Dealer.  
5. Turn OFF all electrical loads. Add fuel if neces-  
sary and then start the engine.  
6. Allow the unit to warm up thoroughly.  
7. Apply electrical loads to at least 50 percent of the  
unit’s rated wattage capacity.  
8. When the engine is thoroughly warmed up, shut  
it down.  
3.12 EXERCISING THE GENERATOR  
Generac recommends that you start and operate the  
generator at least once every seven days. Let  
the unit run for at least 30 minutes to “exercise”  
the engine.  
9. Your generator is now ready for service.  
3.14 WATTAGE REFERENCE GUIDE  
Running Watts  
Battery Charger..................................................500  
Belt Sander (3”)................................................1000  
Chain Saw........................................................1200  
Circular Saw (6-12”) ............................800 to 1000  
Disc Sander (9”) ..............................................1200  
Hand Drill (1”) ................................................1100  
Hedge Trimmer..................................................450  
Impact Wrench ..................................................500  
Lawn Mower ....................................................1200  
Electric Range (one element)............................1500  
Television............................................1750 to 2000  
Coffee Maker....................................................1000  
Electric Skillet..................................................1250  
Hair Dryer........................................................1200  
Light Bulb ..........................................................100  
Microwave Oven ................................................700  
Oil Burner on Furnace ......................................300  
Oil Fired Space Heater (140,000 Btu)................400  
Radio ........................................................50 to 200  
Slow Cooker ......................................................200  
*Furnace Fan (1/3 HP)......................................1200  
*Refrigerator ......................................................600  
*Air Conditioner (12,000 Btu)..........................1700  
*Compressor (1HP)..........................................2000  
*Deep Freeze ......................................................500  
*Milk Cooler ....................................................1100  
*Submersible Pump (1-1/2 HP)........................2800  
*Submersible Pump (1 HP)..............................2000  
*Paint Sprayer, Airless (1/3 HP) ........................600  
*Table Saw (10”) ................................1750 to 2000  
3.13 OUT OF SERVICE PROCEDURE  
3.13.1 REMOVAL FROM SERVICE  
N
If you cannot exercise the generator every seven days,  
and it is to be out of service longer than 30 days, pre-  
pare the generator for storage as follows:  
1. Start the engine and let it warm up.  
2. Close the fuel shutoff valve in the fuel supply line  
and allow the unit to shut down.  
3. While the engine is still warm from running,  
drain the oil completely. Refill the crankcase with  
SAE 10W-30 oil having API classification “For  
Service SF.”  
4. Attach a tag to the engine indicating the viscosity  
and classification of the oil in the crankcase.  
5. Remove the spark plug and pour two or three  
tablespoons of clean, fresh engine oil into the  
spark plug threaded openings. Reinstall and  
tighten the spark plug.  
6. Remove the battery and store it in a cool, dry  
room on a wooden board. Never store the battery  
on any concrete or earthen floor.  
7. Clean and wipe the entire generator.  
3.13.2 RETURN TO SERVICE  
N
To return the unit to service after storage, proceed  
as follows:  
1. Check the tag on the engine for oil viscosity and  
classification. Verify that the correct recommend-  
ed oil is used in the engine (see Section 1.5.4,  
Page 6). If necessary, drain and refill with the  
proper oil.  
* Allow 2-1/2 times the listed watts for starting these  
devices.  
®
Generac Power Systems, Inc. 15  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 4 – Notes  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
®
16 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
PART II –  
INSTALLATION  
INSTRUCTIONS  
ONLY QUALIFIED ELECTRICIANS OR CONTRACTORS  
SHOULD ATTEMPT INSTALLATION!!  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Safety Rules  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
DANGER: For fire safety, installation of a generator into a recreational vehicle must comply strictly  
with article 551, NFPA 70; ANSI C1-1975; AND, ANSI A119.2-1975/NFPA 501C “Standard for  
Recreational Vehicles” (Part 3, “Installation of Electrical Systems”). In addition, installation must  
comply with the manufacturer’s instructions and recommendations.  
NOTICE TO INSTALLER  
GENERAL HAZARDS  
These Installation Instructions have been published  
by Generac to aid in the installation of the products  
• For safety reasons, Generac recommends  
that the installation, initial start-up and mainte-  
nance of this equipment is carried out by a  
Generac Authorized Service Dealer.  
described in this manual. Generac assumes that  
installation personnel are familiar with the proce-  
dures for installing such products, or similar prod-  
ucts that Generac manufactures. Generac also  
assumes that personnel have been trained in the rec-  
ommended installation procedures for these prod-  
ucts and that such training includes (a) use of com-  
mon hand tools, (b) use of special Generac tools, and  
(c) use of any tools and/or equipment from other sup-  
pliers.  
• The engine exhaust fumes contain carbon monox-  
ide, which can be DEADLY. This dangerous gas, if  
breathed in sufficient concentrations, can cause  
unconsciousness or even death. This exhaust sys-  
tem must be installed properly, in strict compli-  
ance with applicable codes and standards.  
Following installation, you must do nothing that  
might render the system unsafe or in noncompli-  
ance with such codes and standards. The genera-  
tor compartment must be completely vapor sealed  
from the vehicle interior. There must be no possi-  
bility of exhaust fumes entering the vehicle interi-  
or. Never operate this equipment with a leaking or  
defective exhaust system.  
• Keep hands, feet, clothing, etc., away from drive  
belts, fans, and other moving or hot parts. Never  
remove any drive belt or fan guard while the unit is  
operating.  
• Adequate, unobstructed flow of cooling and venti-  
lating air is critical to correct generator operation  
and is required to expel toxic fumes and fuel  
vapors from the generator compartment. Without  
sufficient cooling airflow, the engine/generator  
quickly overheats, which causes serious damage to  
the generator. Do not alter the installation or per-  
mit even partial blockage of ventilation provisions,  
as this can seriously affect safe operation of the  
generator.  
Generac cannot possibly know of and advise the  
recreational vehicle trade of all conceivable methods,  
procedures or techniques by which to perform an  
installation. Nor can Generac anticipate every possi-  
ble hazard that might result from each installation  
method, procedure or technique. Generac has not  
undertaken any such wide evaluation. Therefore,  
people who use a method, procedure or technique  
that Generac does not specifically recommend must  
first completely satisfy themselves that their safety,  
the safety of the vehicle's occupants and the product's  
safety is not endangered by the method, procedure or  
technique selected.  
Information, illustrations, specifications, etc., con-  
tained in these Installation Instructions are based on  
the latest information available at the time of publi-  
cation. Every effort has been expended to be sure that  
such data is both accurate and current. However, the  
manufacturer reserves the right to change, alter or  
otherwise improve this product at any time without  
prior notice.  
• When working on this equipment, remain alert at  
all times. Never work on the equipment when you  
are physically or mentally fatigued.  
• Before performing any maintenance on the genera-  
tor, disconnect its battery cables to prevent acci-  
dental start up. Disconnect the cable from the bat-  
tery post indicated by a NEGATIVE, NEG or (–)  
first. Reconnect that cable last.  
• Never use the generator or any of its parts as a  
step. Stepping on the unit can stress and break  
parts, and may result in dangerous operating con-  
ditions from leaking exhaust gases, fuel leakage,  
oil leakage, etc.  
Despite the safe design of this generator,  
operating this equipment imprudently, neglecting  
its maintenance or being careless can cause  
possible injury or death. Permit only responsible  
and capable persons to operate or maintain this  
equipment.  
Potentially lethal voltages are generated by  
these machines. Ensure all steps are taken to  
render the machine safe before attempting to  
work on the generator.  
Parts of the generator are rotating and/or hot  
during operation. Exercise care near running  
generators.  
• Never insert any tool or other object through open-  
ings in the generator interior, even if the unit is not  
running. You might seriously injure yourself or  
damage the equipment.  
®
18 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Safety Rules  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
ELECTRICAL HAZARDS  
FIRE HAZARDS  
• The generator covered by this manual produces  
dangerous electrical voltages and can cause fatal  
electrical shock. Avoid contact with bare wires, ter-  
minals, connections, etc., while the unit is running.  
Ensure all appropriate covers, guards and barriers  
are in place before operating the generator. If you  
must work around an operating unit, stand on an  
insulated, dry surface to reduce shock hazard.  
• Do not handle any kind of electrical device while  
standing in water, while barefoot, or while hands  
or feet are wet. DANGEROUS ELECTRICAL  
SHOCK MAY RESULT.  
• During installation onto the vehicle, properly  
ground (bond) the generator either by solid mount-  
ing to the vehicle frame or chassis, or by means of  
an approved bonding conductor. DO NOT connect  
the bonding conductor to any generator part that  
might be removed or disassembled during routine  
maintenance. If the grounding conductor must be  
replaced, use only a flexible conductor that is of  
No. 8 American Wire Gauge (AWG) copper wire  
minimum.  
For fire safety, the generator must be installed and  
maintained properly. Installation always must  
comply with applicable codes, standards, laws and  
regulations. Adhere strictly to local, state and  
national electrical and building codes. Comply  
with regulations the Occupational Safety and  
Health Administration (OSHA) has established.  
Also, ensure that the generator is installed in  
accordance with the manufacturer’s instructions  
and recommendations. Following proper installa-  
tion, do nothing that might alter a safe installation  
and render the unit in noncompliance with the  
aforementioned codes, standards, laws and regu-  
lations.  
• Keep a fire extinguisher in the vehicle at all times.  
Extinguishers rated ABC” by the National Fire  
Protection Association are appropriate for use on  
the recreational vehicle generator electrical system.  
Keep the extinguisher properly charged and be  
familiar with its use. If you have any question per-  
taining to fire extinguishers, consult your local fire  
department.  
• If the vehicle electrical circuits can be powered by  
any other source of electricity (such as a “dock-  
side” power receptacle), there must be no possibil-  
ity of connecting the different power sources to the  
vehicle circuits at the same time. The dockside  
(utility) power source must be positively isolated  
from the vehicle circuits whenever the generator is  
operating. Failure to isolate the vehicle circuits  
from the dockside power supply when the genera-  
tor is running may result in damage to the genera-  
tor or serious injury or death to dockside (utility)  
power workers due to backfeed of electrical ener-  
gy.  
• In case of accident caused by electric shock, imme-  
diately shut down the source of electrical power. If  
this is not possible, attempt to free the victim from  
the live conductor. AVOID DIRECT CONTACT  
WITH THE VICTIM. Use a nonconducting imple-  
ment, such as a rope or board, to free the victim  
from the live conductor. If the victim is uncon-  
scious, apply first aid and get immediate medical  
help.  
EXPLOSION HAZARDS  
• Do not smoke around the generator. Wipe up any  
fuel or oil spills immediately. Ensure that no com-  
bustible materials are left in the generator com-  
partment, or on or near the generator, as FIRE or  
EXPLOSION may result. Keep the area surround-  
ing the generator clean and free from debris.  
• Gasoline is extremely FLAMMABLE and its vapors  
are EXPLOSIVE. Do not permit smoking, open  
flame, sparks or any source of heat in the vicinity  
while handling gasoline. Comply with all laws gov-  
erning the storage and handling of gasoline.  
• Fuel lines must be properly installed and  
fastened, and free of leaks. There must be  
no possibility of gasoline vapors entering the vehi-  
cle interior.  
You are required to install an approved, flexible,  
nonconductive fuel line between the generator fuel  
connection point and rigid fuel lines.  
• Never wear jewelry when working on this equip-  
ment. Jewelry can conduct electricity resulting in  
electric shock, or may get caught in moving com-  
ponents causing injury.  
• If the generator is equipped with a liquid propane  
(LP) gas fuel system, install the unit so it complies  
with all codes, standards and regulations pertain-  
ing to such systems. LP gas is highly explosive. The  
gas tends to settle in low areas where even the  
slightest spark can ignite it and cause an explo-  
sion. Do not allow gas vapors to enter the vehicle.  
®
Generac Power Systems, Inc. 19  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 5 – General Information  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
6. CSA Electrical Bulletin 946, available from the  
5.1 PURPOSE AND SCOPE OF THE  
Canadian Standards Association, Housing and  
Constructions Materials Section, 178 Rexdale  
Boulevard, Rexdale, Ontario, Canada, M9W 1R3.  
INSTALLATION INSTRUCTIONS  
These Installation Instructions have been prepared  
especially for the purpose of familiarizing installers and  
owners of the applicable equipment with the product's  
installation requirements. Give serious consideration to  
all information and instructions in the manual, both for  
safety and for continued reliable operation of the equip-  
ment.  
5.4 EQUIPMENT DESCRIPTION  
Instructions and information in this section pertain to  
Generac air-cooled generators. These generators are  
designed specifically for installing in recreational vehi-  
cles. They operate 120-volt, single-phase, 60-Hertz, AC  
electrical loads that require 55.0 amps (gasoline) or  
51.7 amps (LP fuel) at 120 volts.  
Because of the different recreational vehicle models and  
the variations between the models, it would be extremely  
difficult, if not impractical, to provide detailed instruc-  
tions for every possible installation. For that reason,  
instructions and illustrations in this manual are general  
in nature. Illustrations are not intended to serve as  
detailed installation blueprints.  
5.5 GENERATOR ENGINE  
OPERATING SPEED  
The generator’s revolving field (rotor) is driven by a sin-  
gle-cylinder, four-cycle engine through a pulley and drive  
belt arrangement. The generator supplies 120 volts AC  
at 60 Hertz when the rotor is operating at 3,600  
rpm.The drive belt arrangement allows the engine to  
operate at a lower speed than the rotor.  
The installation should comply strictly with all applica-  
ble codes, standards and regulations pertaining to the  
installation and use of this product. If any portion of  
this manual appears to be in conflict with such codes,  
standards or regulations, the applicable codes, stan-  
dards or regulations must take precedence over the  
manual.  
5.6 GENERATOR AC  
CONNECTION SYSTEM  
These air-cooled generator sets are equipped with dual  
stator AC power windings. These two stator windings  
supply electrical power to customer electrical loads by  
means of a dual 2-wire connection system.  
5.2 SAFETY  
Before handling, installing, operating or servicing this  
equipment, carefully read the “Notice to Installer” and  
“Safety Rules” on Pages 18 and 19. Comply with all safe-  
ty rules to prevent death, personal injury or damage to  
equipment and/or property. Stress safety to all  
installers, operators and service technicians who work  
on this equipment.  
Generators may be installed to provide the following  
outputs:  
1) 120 VAC loads only — one load with a maximum total  
wattage requirement equal to the generator’s rated  
power output (in watts), and 120V across the generator  
output terminals. (See Fig. 5.1 below)  
5.3 STANDARDS BOOKLETS  
Installation, use and servicing of this equipment should  
comply strictly with published standards, as well as the  
manufacturer's recommendations. The following stan-  
dards booklets (latest revision) are available from the  
sources indicated:  
2) 120/240 VAC loads — one load with a maximum total  
wattage requirement equal to the generator’s rated  
power output, and 240 V across the generator output  
terminals; or two seperate loads, each with a maximum  
total wattage requirement equal to half of the genera-  
tor’s rated power output (in watts), and 120 V across  
the generator output terminals. (See Fig. 5.3 on page 22)  
1. NFPA Standard 501C, “Standard for Recreational  
Vehicles,” available from the National Fire  
Protection Association, Batterymarch Park, Quincy,  
MA 02269.  
Figure 5.1 – Connection for 120 Volts Only  
2. NFPA 70, “NFPA Handbook of the National Electric  
Code,” available same as Item 1.  
3. ANSI C1-1975 and ANSI 119.2-1975, available from  
the American National Standards Institute, 1430  
Broadway, New York, NY 10018.  
4. ANSI A119.2/NFPA 501C, available from the  
Recreational Vehicle Association, 1896 Preston  
White Drive, Reston, VA 22090.  
5. California Administrative Code, Title 25, available  
from the State of California, Documents Section,  
P.O. Box 1015, North Highlands, CA 95660.  
®
20 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 5 – General Information  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Figure 5.2 - Major Features and Dimensions  
PrimePact 66G and 66LP  
Control Panel  
Spark Plugs  
(both sides,  
not shown)  
Oil Fill/Oil Level  
Oil Drain Plug  
Fuel Filter  
Fuel Pump  
Starter Contactor  
Oil Filter  
Air Filter  
Ground Lug  
®
Generac Power Systems, Inc. 21  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 6 – Installation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
walls and ceiling, the minimum recommended  
Figure 5.3 - Connection for 120/240 Volts  
applies to the space between the generator and such  
insulation.  
T1  
RED  
CB1  
• The location must provide adequate cooling and ven-  
tilating airflow for the generator without a great deal  
of work and expense.  
6.1.2 GENERATOR SUPPORT  
N
T2  
The generator must be securely attached to a metal  
framework that has been made part of the vehicle frame  
structure by bolting or welding. The metal framework  
on which the generator will rest and which will restrain  
the generator set should consist of at least two horizon-  
tal beams. These beams should consist of (a) 1-1/2-inch  
square, 11-gauge steel tubing OR (b) 1-1/2-inch, 11-  
gauge angle iron. A typical supporting frame with hori-  
zontal support tubing, is shown in Figure 6.1.  
WHITE  
CB2  
T3  
BLACK  
GROUNDED NEUTRAL  
STATOR WINDINGS  
• The AC connection system on all air-cooled  
PRIMEPACT series generators uses a GROUNDED  
neutral.  
The generator can be installed so that it sits on top of  
the horizontal support tubing if the vehicle design per-  
mits. Another method is to suspend the generator below  
the horizontal support tubing by means of suitable,  
structurally sound metal framework. The following gen-  
eral rules apply:  
• A separate green ground wire is connected to the  
recreational vehicle’s junction box.  
• Loads connected across T1 (Red) to T2 (White), and  
T3 (Black) to T2 (White), must not exceed 27.5 amps  
for PrimePact 66G, or 25.8 amps for PrimePact 66LP,  
with a voltage of 120V across each set of terminals.  
NOTE:  
Vehicle construction MUST be capable of supporting  
the weight of the generator.  
• Whether the generator is mounted above the horizon-  
tal support tubing or suspended below the tubing, the  
supporting frame used must be structurally sound.  
• If the generator cannot be bolted directly to  
the supporting frame or support tubing, consider  
Do NOT connect loads in excess of circuit  
breaker ratings.  
6.1 LOCATION AND SUPPORT  
using  
additional  
tubing,  
angle  
brackets  
or other supports to give the supporting frame suffi-  
cient strength.  
6.1.1 GENERATOR LOCATION  
N
The most desirable location for the generator set is  
between the vehicle's main frame members. However,  
this is seldom possible. Most units must be installed on  
the side of the vehicle and are difficult to reinforce.  
Figure 6.1 – Typical Horizontal Support Frame  
Many recreational vehicles have been factory equipped  
with an area for the generator set. Some vehicles may  
even have a generator compartment provided by the  
vehicle manufacturer.  
Plan the generator location based on the following:  
• The generator set must be installed on a framework  
that is part of the recreational vehicle, as outlined in  
Section 6.1.2.  
• The location must provide an access opening that is  
large enough to permit generator removal (unless the  
generator is to be removed from underneath the sup-  
porting framework).  
• The location must provide easy access to frequently  
serviced components, such as filters, oil drains,  
spark plugs and other common maintenance parts.  
• The location must provide sufficient room to allow  
minimum clearances as outlined in Section 6.2. If  
sound insulation is to be used on the compartment  
6.1.3 SUSPENDED MOUNTING  
N
If you are going to suspend the generator below the hor-  
izontal support tubing, the suspension method you use  
with the vehicle frame members must (a) be able to sup-  
port the weight of the generator AND (b) provide suffi-  
cient restraint for the generator. One typical suspended  
mounting system is shown in Figure 6.2. The location of  
a suspended mounting system must be carefully  
planned, keeping the following general rules in mind:  
®
22 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 6 – Installation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
• Protect the generator against road splash and debris. from the back for air circulation AFTER the compart-  
Baffles or splash guards may be required to protect cer- ment has been lined with metal and sound insulation  
tain areas of the generator. To make sure the generator (Figure 6.4).  
is adequately protected, road test the installation  
through mud, water and slush.  
NOTE:  
Refer to “Figure 5.2 – Major Features and  
Dimensions” on Page 21.  
Figure 6.2 – Typical Suspended Mounting System  
Figure 6.4 – Clearances  
Plywood  
Compartment  
1 1/2" Clearance on Top  
1" Clearance  
in Back  
1" Each Side  
1/2"  
Insulation  
in Front  
• The installer must make certain that the selected  
location will permit adequate cooling and ventilating  
airflow to be supplied.  
6.2.2 COMPARTMENT CONSTRUCTION  
N
• The generator compartment should be either con-  
structed of, or lined with, 26-gauge galvanized steel.  
NOTE:  
6.1.4 GENERATOR RESTRAINT  
N
Use four 3/8"-16 hardened steel bolts (Grade 5) to fasten  
the generator to the supporting frame or the support tub-  
ing. These bolts must pass through (a) the generator  
mounting base, (b) the compartment floor (if a compart-  
ment is used) and (c) the supporting framework  
(Figure 6.3). All bolts must be long enough so that when  
tight, at least three threads are visible past the retaining  
lock nuts. Refer to Section 6.2 for the location of the gen-  
erator mounting holes.  
Aluminum is NOT an acceptable alternative  
to galvanized steel due to aluminum’s low  
melting point.  
• If the compartment is lined with galvanized steel, it  
may be constructed of any material. Generac recom-  
mends that the compartment be constructed of 1/2-  
inch thick plywood (not strandboard), with the floor  
made of a double thickness of 1/2-inch plywood with  
the grain of the wood at cross section for added  
strength (Figure 6.5).  
Figure 6.3 – Typical Generator Restraint  
Figure 6.5 – Typical Compartment Construction  
6.2 GENERATOR COMPARTMENTS  
Whether the generator set is being installed inside a com-  
partment specifically manufactured to house a generator  
or inside a compartment that the installer constructs, the  
compartment MUST meet certain specifications as out-  
lined in the following sections:  
6.2.1 COMPARTMENT SIZE  
N
Plan the compartment size carefully. Provide a mini-  
mum clearance of 1/2 inch (13 mm) on the front and  
top, 1 inch (25 mm) on the sides, and 1/2 inch (13 mm)  
®
Generac Power Systems, Inc. 23  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 6 – Installation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
• If constructing a compartment, line the exterior  
transferred through the compartment structure,  
may be sufficient to ignite, char or discolor  
seat cushions, fiberboard and other flammable  
materials. You may need to use approved  
nonflammable insulating materials in high  
temperature areas.  
(underside) of the compartment floor with 26-gauge  
galvanized steel.  
• All seams, splices and joints of the compartment  
walls (unless vapor tight by design) should be  
caulked to prevent poisonous, flammable or explo-  
sive vapors from entering the vehicle interior.  
NOTE:  
6.2.3 SOUND INSULATING MATERIALS  
N
Once installers have determined that a compartment is  
properly constructed and metal lined, they can add  
acoustical material. This may include additional sealant  
or insulating material, to reflect noise away from the  
vehicle interior.  
Caulking must be done so that the caulking material  
will stay in place permanently. Pressing such materi-  
als as putty tape onto joints and seams is not accept-  
able. A high quality silicone rubber base sealant is  
recommended.  
Sound insulating materials should be of a nonflamma-  
ble type. One excellent insulating material is a 1-inch  
(25 mm) thick fiberglass having a 2-pound density.  
When fiberglass is used, its coated side should face  
toward the compartment interior.  
• Holes and openings made in the compartment walls  
to allow for the passage of electrical conduit, conduc-  
tors, hoses, cables, etc., into the vehicle living area  
must be sealed vapor tight with silicone rubber base  
sealant.  
• If flexible metal conduit is used, it must be sealed  
internally at the end where it terminates inside the  
compartment’s electrical junction box.  
NOTE:  
Do not install sound insulation or any absorbent  
material on the compartment floor interior. Such  
materials will become soaked with combustible or  
explosive vapors and liquids and will become a  
fire hazard.  
Flexible metal conduit, due to its unique construc-  
tion, is NOT vapor tight along its entire length.  
• Seams and joints of the galvanized steel (whether  
used as a liner or for the compartment itself) must be  
lapped and mechanically secured. Such seams may  
be manufactured, welded, bolted, riveted or screwed.  
Manufactured lock seams are shown in Figure 6.6.  
Installer constructed compartments typically utilize a  
standard lap joint.  
Using a combination of sound insulating materials can  
often reduce noise more effectively than a single mater-  
ial. For example, a sheet of lead or visco-elastic materi-  
al, along with a layer of other acoustical material, is  
more effective than when a single material is used.  
6.2.4 ACOUSTICS  
For additional noise abatement, the installer may wish  
to consider the following:  
N
Figure 6.6 – Types of Lock Seams  
• Using special sound insulating materials.  
• Construction of a special noise abatement compart-  
ment.  
NOTE:  
Any method used to reduce noise must not adverse-  
ly affect the flow of cooling and ventilating air into or  
out of the compartment.  
In addition to the effective use of sound insulating mate-  
rials, construction of a special noise abatement com-  
partment might be considered to reduce noise levels.  
Such a compartment might be constructed as follows  
(Figure 6.7, page 25):  
• After the compartment has been metal lined and  
vapor sealed, line the compartment interior walls and  
ceiling with an approved, nonflammable sound insu-  
lating material. See Section 6.2.3.  
• Use 5/8-inch thick or 3/4-inch thick plywood in the  
compartment.  
• Construct the compartment floor of a double thick-  
ness of 5/8-inch or 3/4-inch plywood.  
• Line the compartment interior walls and floor, as well  
as the underside of the floor, with 26-gauge galva-  
nized steel.  
Do not install any flammable material directly  
above or around the compartment. Heat,  
®
24 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 6 – Installation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Vapor seal all compartment seams and joints.  
Figure 6.7 – Typical Noise Abatement  
• Over the galvanized steel lining, install a combination  
of acoustical materials as mentioned in Section 6.2.3.  
To prevent fire or explosion, do not install any  
insulation or other absorbent materials on the  
interior or underside of the compartment floor.  
• Seal all compartment door edges to prevent noise  
leakage around the door perimeter.  
• Line the compartment door interior (except for air  
openings) with suitable, fireproof sound insulation  
(such as 1-inch (25 mm) thick fiberglass with a 2-  
pound density).  
Figure 6.8 — Compartment Floor Cutout  
®
Generac Power Systems, Inc. 25  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 6 – Installation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
6.2.5 COMPARTMENT FLOOR CUTOUTS  
6.3.2 COOLING AIR INLET OPENINGS  
N
N
You must provide openings in the generator compart- The minimum size of the air inlet opening, whether the  
ment for the following items (Figure 6.8, Page 25):  
generator is housed in a conventional compartment or  
not, is at least 100 square inches (see Figure 6.10).  
This rule applies whether inlet air is brought in through  
an opening in the compartment door, an opening in the  
vehicle skirt, through ductwork, or by any other means.  
• Engine exhaust and cooling air outlets  
• Generator cooling air inlet  
Four holes for passage of generator mounting bolts.  
See Section 6.1.4 (Page 23).  
NOTE:  
Screening, louvers or expanded metal that cover air  
openings restrict airflow. You must compensate for  
this by making the actual air opening proportionate-  
ly larger. See Section 6.3.3 (Page 27).  
Fuel lines and exhaust piping must not penetrate  
into the vehicle living area.  
6.3 COOLING AND VENTILATING AIR  
It is absolutely essential that an adequate flow of air for  
cooling, ventilating and engine combustion be supplied  
to the generator set. Without sufficient airflow, the  
engine/generator quickly overheats. Such overheating  
can cause serious operating difficulties and also may  
cause fire and personal injury. The installer must make  
sure that sufficient air is available to the generator for  
cooling, ventilating and combustion. The installer also  
must provide for a path for exhausting the cooling air to  
the exterior of a compartment, if so equipped.  
Figure 6.10 – Air Inlet in Compartment Door  
Never use discharged cooling air for heating or  
permit such air to enter the vehicle interior. This  
air contains deadly carbon monoxide gas and  
other poisonous, flammable or explosive gases.  
NOTE:  
6.3.1 GENERATOR AIRFLOW  
N
Be sure to meet the minimum clearances illustrated  
in Figure 6.4 (Page 23).  
Engine operation drives cooling fans for the two-stage  
cooling air system. A pressure fan draws cooling air into  
the top of the generator (Figure 6.9). This airflow cools  
the engine/generator and electronic components. The  
second part of the cooling system, a suction fan, draws  
air that is heated from a hot engine into a collector pan  
at the base of the unit. This heated air (although cooler  
than exhaust muffler) is then deflected out the bottom  
toward the ground.  
When the unit is installed on a suspended mounting  
system, one of several different methods of supplying  
airflow may be used as follows:  
• Provide a door in the vehicle skirt having an air inlet  
opening (Figure 6.11).  
Figure 6.11 – Suspended Mount: Inlet Door  
Figure 6.9 – Airflow Through Engine/Generator  
• Using ductwork (Figure 6.12, Page 27). The installer  
must be sure air is available to the top of the genera-  
tor since air inlets are located at the top.  
• By providing an opening in the vehicle skirt and space  
®
26 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 6 – Installation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
behind the generator for cooling airflow  
(Figure 6.13 ). Recommended clearance behind the  
back of the generator is at least 1/2 inch (13 mm).  
6.3.4 TESTING THE INSTALLATION  
N
Generac recommends testing the installation to be sure  
adequate cooling airflow is available to the unit before  
placing the unit into service. If the unit shows signs of  
overheating, you will need to enlarge the air openings.  
Never place a unit into service until absolutely certain  
that cooling and ventilation is adequate.  
Figure 6.12 – Air Inlet Using Ductwork  
NOTE:  
You must test the installation, especially if you bring  
in air from below the generator set.  
6.4 GASOLINE FUEL SYSTEM  
The installation of a gasoline fuel system (Figure 6.14)  
for a recreational vehicle generator set must comply  
with applicable codes, standards and regulations. The  
entire fuel system must be completely free of leaks.  
There must be no possibility of gasoline vapors entering  
the vehicle interior.  
Figure 6.13 – Air Inlet in Vehicle Skirt  
VEHICLE FLOOR  
VEHICLE  
Figure 6.14 – Generator Fuel System  
SKIRT  
AIR  
INLET  
Fuel Pump  
Fuel Filter  
MINIMUM  
CLEARANCE  
1-1/2"  
6.3.3 COMPENSATING FOR RESTRICTIONS  
N
Fuel Line  
Such materials as screening, louvers or expanded metal  
can restrict the free flow of air. Compensate for this  
restriction by making the actual air opening propor-  
tionately larger.  
Gasoline is highly flammable, and its vapors are  
explosive. Comply with all codes, standards and  
regulations pertaining to gasoline fuel systems  
used in recreational vehicle generators. Properly  
install and maintain the fuel system and keep it  
entirely free of leaks. Gasoline vapors must not  
enter the vehicle interior.  
Some materials may offer only a 60 percent “free air  
inlet area.” Other more efficient materials may provide  
up to a 90 percent free air inlet area. The percentage of  
free air inlet opening is usually available from the mate-  
rial supplier or manufacturer.  
To determine the actual air inlet opening size  
required, divide 100 square inches by the percent-  
age of free air inlet area for the material you will use.  
Factory installed generator fuel system components  
include (a) fuel filter, (b) 12-volt DC electric pump, (c)  
engine carburetor, and (d) interconnecting lines and fit-  
tings. Connect a fuel supply line to the fuel filter inlet.  
Use a flexible length of approved fuel hose between the  
fuel filter inlet connection and rigid fuel lines.  
For example: If you plan to use screening with an 80  
percent free air inlet area, divide 100 by 0.8, which  
results in 125 square inches. Minimum actual size of  
air inlet opening in this case is 125 square inches.  
®
Generac Power Systems, Inc. 27  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 6 – Installation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
• The hose should be at least 6 inches (152 mm) longer  
6.4.1 FUEL TANK  
N
than is needed to prevent the hose from rupturing if  
the generator shifts or settles.  
Either the generator must share the vehicle engine's fuel  
tank, or you must install a separate fuel tank for the  
generator set. All fuel tanks installed on the vehicle  
must be constructed, installed and restrained so they  
comply with applicable codes, standards and regula-  
tions.  
6.5 LP GAS FUEL SYSTEM  
LP gas is highly EXPLOSIVE. The gas is heavier  
than air and tends to settle in low areas. Even the  
slightest spark can ignite it and cause and explo-  
sion. Only competent, qualified people should be  
allowed to install, test, adjust or service an LP gas  
fuel system. Install the optional fuel system in  
compliance with applicable codes, standards and  
regulations. After the installation, do not do any-  
thing that might render the system in noncompli-  
ance with applicable codes and standards.  
If the generator is to share the vehicle engine's tank, sep-  
arate fuel pickup tubes are required for the engine and  
the generator. Generac recommends that you make the  
fuel pickup tube 2 to 3 inches (51 to 76 mm) shorter  
than the vehicle engine's pickup tube. This prevents the  
generator from depleting the entire fuel supply during  
prolonged generator operating periods.  
The LP powered range of generators are fitted with a  
nonadjustable, factory set system. These systems are  
tamper-proof to meet 1997 California Air Resources  
Board requirements for engine emission.  
Do NOT tee the generator fuel supply line into  
the vehicle engine fuel supply line. If this is done,  
the generator will be starved of fuel when both  
engines are operating at the same time. Also,  
while the vehicle engine is not running, generator  
operation may drain the vehicle engine supply  
line, making it difficult to start the vehicle engine.  
6.5.1 PARTS NOT INCLUDED IN FUEL SYSTEM  
N
The propane fuel system does NOT include such items  
as (a) gas tank, (b) gas piping, (c) fittings, (d) valves, and  
(e) primary regulator, used to store the gaseous fuel and  
deliver it to the gaseous fuel solenoid (Figure 2.15, Page  
29).  
6.4.2 GENERATOR FUEL SUPPLY LINE  
N
6.4.2.1 Rigid Fuel Lines  
Those lines used to supply fuel from a tank to the gen-  
erator must comply with applicable codes, standards  
and regulations. The following general rules apply to  
rigid fuel lines:  
Use only approved components in the fuel supply  
system. All components must be properly installed  
in accordance with applicable codes. Improper  
installation or use of unauthorized components  
may result in fire or an explosion. Follow  
approved methods to test the system for leaks.  
No leakage is permitted. Do not allow fuel vapors  
to enter the vehicle interior.  
• Rigid lines should be of annealed, seamless, drawn  
aluminum or steel.  
• Lines and fittings must comply with SAE J512F,  
“Standard Automotive Fittings,” or with ANSI  
B126.26 (latest edition).  
• Route the fuel line so that at least 2 inches (51 mm)  
of clearance is maintained between the line and any  
exhaust system parts.  
• Do not attach electrical wiring to fuel lines. Route the  
wiring so it cannot come into contact with any fuel  
line.  
• Route fuel lines so if they leak, fuel does not drip onto  
any electrical or exhaust system parts.  
• Use nonferrous metal straps without sharp edges to  
secure fuel lines.  
6.4.2.2 Flexible Fuel Line  
Use an approved flexible length of fuel hose between the  
generator fuel inlet connection and rigid fuel lines. This  
prevents breaking of the line caused by vibration, shift-  
ing, settling or movement. The following rules apply:  
• The flexible hose must comply with SAE J30B,  
“Standard for Fuel and Oil Hose.” It must be  
approved for use with gasoline.  
®
28 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 6 – Installation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Figure 6.15 – Typical Propane Gas Fuel System  
6.5.4 PRIMARY REGULATOR  
N
Gas pressure delivered to the solenoid valve must be  
properly regulated by means of a primary gas regulator.  
Mount the primary regulator at the gas tank outlet or in  
the supply line from the gas tank. The following rules  
apply:  
For best results, the primary regulator supplies  
gaseous fuel to the secondary regulator at 11 inches  
water column. Do NOT exceed 14 inches water col-  
umn.  
• The installer must be sure the primary regulator is  
rated at sufficient gas flow to operate the generator  
plus all other gas appliances in the circuit.  
NOTE:  
Recommended MINIMUM gas flow rate for all air-  
cooled PRIMEPACT series generators is 67 cubic feet  
per hour.  
If an existing primary gas regulator does not have a  
sufficient flow capacity for the generator and other  
gas appliances in the circuit, (a) install a primary  
regulator with adequate flow rate, or (b) install a sep-  
arate regulator only and rated at least 67 cubic feet  
per hour. The inlet side of any primary regulator that  
supplies the generator must connect directly to a gas  
pressure tank. Do NOT tee the generator line into a  
gas circuit feeding other areas.  
6.5.2 SOME IMPORTANT CONSIDERATIONS  
When installing an LP gas system, consider seriously  
the following items:  
N
6.5.5 GASEOUS CARBURETION  
N
• All fittings, lines, hoses and clamps must be tight and  
free of leaks. Apply a pipe sealant to threads when  
assembling threaded connections. This reduces the  
possibility of leakage.  
LP gas vapors should be supplied to the secondary reg-  
ulator inlet at about 11 inches water column (positive  
pressure). The engine pistons draw air in during the  
intake stroke (Figure 6.16). This air passes through a  
carburetor venturi, which creates a low pressure that is  
proportional to the quantity of air being pumped. The  
low pressure from the carburetor venturi acts on the  
regulator diaphragm to pull the diaphragm toward the  
source of low pressure. A lever attached to the  
diaphragm opens a valve to permit gas glow through the  
carburetor.  
Test the entire fuel system for leaks using approved  
test methods.  
• Optimum gas pressure at the inlet to the gaseous fuel  
solenoid valve and secondary regulator is 11 inches  
water column.  
• The installer’s fuel supply connection point is at the  
gaseous fuel solenoid valve. This is a 3/4-inch  
(female) connection. Provide a suitable 3/4-inch NPT  
(male) connector to attach to the fuel supply line.  
• Use a length of approved flexible fuel hose between  
the gaseous fuel solenoid valve and rigid gas piping.  
The flexible line should be at least 6 inches longer  
than necessary.  
Figure 6.16 – LP Gas Carburetion Diagram  
6.5.3 VAPOR WITHDRAWAL  
N
LP gas is stored in pressure tanks as a liquid. The gas  
systems used with these generators were designed only  
for vapor withdrawal type systems. Vapor withdrawal  
systems use the gas vapors that form above the liquid  
fuel in the tank. Do NOT attempt to use the generator  
with any liquid withdrawal type system.  
®
Generac Power Systems, Inc. 29  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 6 – Installation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
The greater the airflow through the carburetor venturi, for leaks. Other approved methods of testing for leaks  
the lower the pressure at the venturi throat. The lower may be used, if appropriate. DO NOT USE ANY FLAME  
the pressure at the venturi throat, the greater the TO TEST FOR LEAKS.  
diaphragm movement, and the greater the movement of  
the regulator valve. The more the regulator valve opens,  
the greater the gas flow that is proportional to airflow  
Gaseous fuel lines between the tank and the sec-  
ondary regulator are under a positive pressure  
(about 11 inches water column). Gas pressure at  
the outlet side of the secondary regulator, howev-  
er, is a negative pressure and can draw flame  
inside a line or fitting and cause an explosion.  
through the generator.  
The following facts about the secondary regulator must  
be emphasized:  
• The regulator must be sensitive to venturi throat  
pressure changes throughout the operating range.  
• The regulator must be properly adjusted so it will  
stop the flow of gas when the engine is not running  
(no air flow through the carburetor).  
6.6 EXHAUST SYSTEM  
The generator exhaust system must be safely and prop-  
• The slightest airflow (and vacuum in the venturi erly installed. Only approved mufflers and other  
throat) should move the regulator valve off its seat exhaust system parts must be used. A properly installed  
and permit gas to flow.  
exhaust system must be vapor tight, quiet and com-  
pletely safe.  
6.5.6 FUEL SUPPLY LINES  
N
• LP gas lines must be accessible, but protected against  
possible damage.  
The generator engine gives off DEADLY carbon  
monoxide gas through its exhaust system. This  
dangerous gas, if breathed in sufficient concentra-  
tions, can cause unconsciousness or even death.  
Never operate the generator set with the vehicle  
inside any garage or other enclosed area. DO NOT  
OPERATE THE GENERATOR IF THE EXHAUST SYS-  
TEM IS LEAKING OR HAS BEEN DAMAGED. SYMP-  
TOMS OF CARBON MONOXIDE POISONING ARE  
(a) inability to think coherently; (b) vomiting; (c)  
twitching muscles; (d) throbbing temples; (e)  
dizziness; (f) headaches; (g) weakness; and (h)  
sleepiness. IF YOU FEEL ANY OF THESE SYMP-  
TOMS, MOVE INTO FRESH AIR IMMEDIATELY. IF  
SYMPTOMS PERSIST, GET MEDICAL HELP. Do not  
operate the generator until its exhaust system has  
been inspected and properly repaired.  
• Do NOT connect electrical wiring to any LP gas fuel  
line or run wiring alongside the lines.  
• Route gas lines away from hot engine exhausts.  
• Retain gas lines with metal clamps that do not have  
sharp edges.  
• Install an approved length of flexible hose between  
the gaseous fuel solenoid valve and rigid fuel supply  
lines. The flexible line must be nonmetallic, nonor-  
ganic and nonconductive. It must be approved for use  
with LP gas.  
6.5.7 EXCESS FLOW VALVE  
N
LP gas tanks should have an excess flow valve, accord-  
ing to NFPA 501C, Paragraph 3-4.4. This valve and the  
gas lines must be carefully sized so the valve will close  
when a fuel line is severed or broken. Consult the  
Natural-LP Gas Association for information and limita-  
tions of excess flow valves.  
Manual shutoff valves on the supply tank and elsewhere  
in the system must be fully open when operating the  
generator. The excess flow valve functions properly only  
if all valves are fully open.  
Never tee the generator engine exhaust pipe into  
the vehicle engine exhaust piping. This causes  
excessive back pressure on the generator engine.  
Also, water from one engine can damage the  
other engine.  
6.5.8 LEAKAGE TESTS  
N
6.6.1 MUFFLERS AND SPARK ARRESTORS  
N
Do not place the generator into service until you have  
properly tested the gas system for leaks. To test the sys-  
tem, you need a separate source of 12 volts DC to open  
the gaseous fuel solenoid valve.  
This muffler meets code and standard requirements of  
the U.S. Forest Service. Use only mufflers and parts  
approved by Generac. Any person(s) installing an unap-  
proved muffler, or an unapproved exhaust system part,  
or modifying an exhaust system in any way that might  
cause a hazard, is liable for any damage, injury or war-  
ranty expense that might be caused by such unapproved  
installation or modification.  
The leak test must comply fully with NFPA, Paragraph  
318. All connections, hoses, valve regulators, fittings,  
and other fuel system parts must be tested under gas or  
air pressure of not less than 90 psi (620 kPa), while  
using soap and water or an equivalent solution to check  
®
30 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 6 – Installation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Failure to provide and maintain a spark arrestor may be  
excessive back pressure on the generator engine.  
• Never tee the generator engine exhaust pipe into the  
vehicle engine exhaust piping. This causes excessive  
back pressure on the generator engine. Also, water  
from one engine can damage the other engine.  
in violation of the law. If this generator is used on any  
forest covered, brush covered or grass covered unim-  
proved land, you must provide a spark arrestor. The  
vehicle owner or operator must maintain this device in  
good condition. In the state of California, the preceding  
is required by law (Section 4442 of the California Public  
Resources Code). Other states may have similar laws.  
Federal laws apply on federal lands.  
• Plan exhaust system installation carefully. Comply  
with all applicable codes, standards and regulations.  
6.7 ELECTRICAL CONNECTIONS  
Be sure to read Section 5.6 on Page 20.  
6.6.2 TYPE OF EXHAUST SYSTEM  
N
The following general rules apply to electrical connec-  
tions in a recreational vehicle:  
Two types of exhaust systems for PRIMEPACT series  
generators are available from Generac. They include the  
following:  
• Qualified electricians who are familiar with applica-  
ble codes, standards and regulations should install  
electrical wiring.  
• The wiring should comply with codes, standards and  
regulations. The National Electrical Code (NFPA 70),  
and state and local codes apply.  
• Switches and circuit breakers should be of a type  
approved for use in recreational vehicles and must be  
mounted and installed to prevent damage from road  
shock.  
• Wiring must be of adequate size, have approved insu-  
lative qualities and be properly supported.  
• Conduit and wire openings into the generator com-  
partment (if used) must be vapor-sealed to prevent  
entry of flammable, explosive or poisonous gases into  
the vehicle.  
• “Out-the-bottom” exhaust system dimensions are  
1 5/16” O.D., model 9742.  
• “Out-the-side” exhaust system dimensions are  
1” O.D., 18 gauge, modelS 9743 and 9326.  
NOTE:  
No matter what type of exhaust kit best fits your  
recreational vehicle, the mounting base has open-  
ings for either “bottom-out” or “side-out” exhaust  
systems. Use the cover plate provided with the gen-  
erator to cover the opening you do NOT use.  
6.6.3 EXHAUST SYSTEM SAFETY  
N
• Maintain a clearance of at least 3 inches (76 mm)  
between exhaust system parts and any combustible  
material (such as wood, felt, cotton, organic fibers or  
other like material). If you cannot maintain the 3-inch  
(76 mm) clearance, locate, insulate or shield the  
exhaust part(s) so that the temperature of any com-  
bustible material is not raised more than 117° F (65°  
C) above the ambient air temperature.  
• Extend the exhaust system at least 1 inch (25 mm)  
past the outer edge of the vehicle. Do not terminate  
the exhaust system under the vehicle.  
Terminate the exhaust tailpipe such that exhaust  
gases will not be drawn back into the generator com-  
partment and recirculated.  
6.7.1 ELECTRICAL JUNCTION BOX  
N
Install an approved, square electrical junction box with  
a blank cover on the interior or exterior wall of the area  
you plan to install the generator (NOT on the generator).  
Route the generator's AC output leads into this junction  
box through approved flexible conduit. This is the point  
of first termination for generator AC output leads.  
6.7.2 WIRING  
N
• Wiring should be of stranded copper to reduce the  
chance that vibration may cause breakage.  
• Wire gauge size should be large enough to handle at  
least 115 percent of the installed generator's rated  
maximum current.  
• If there is any possibility of the tailpipe or muffler  
being damaged, protect these damage-prone areas by  
means of a protective device (such as a skid bar).  
• Install the generator exhaust system according to safe  
automotive practices.  
• If neutral conductors are used, they must be the same  
size as other leg wires.  
• Use enough exhaust system hangers to prevent any  
• Route power supply conductors from generator AC  
output leads T1 (red), T2 (white), T3 (black) and the  
green ground wire through approved flexible conduit  
to the electrical junction box on the compartment  
wall.  
part of the system from being dislocated.  
• Use exhaust system parts recommended by Generac.  
Using unapproved exhaust mufflers and exhaust sys-  
tem parts is the responsibility of the person(s)  
installing such unauthorized parts.  
• Do not terminate the exhaust system under any open-  
ing, window or vent that can be opened or is not per-  
manently sealed from the vehicle interior.  
If flexible metal conduit is used between the genera-  
tor and the compartment junction box, the conduit  
end that terminates the compartment junction box  
must be vapor-sealed. Flexible metal conduit is NOT  
vapor tight along its entire length.  
• Exhaust piping must be large enough to prevent  
®
Generac Power Systems, Inc. 31  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 6 – Installation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
• From the junction box, route power supply wires  
6.7.4 CONDUIT  
Route the connections between the generator and the  
junction box through approved, flexible conduit. The  
following general rules apply:  
N
through approved conduit to either (a) double-pole,  
double-throw transfer switch, or (b) approved isola-  
tion receptacle. Connecting to a transfer switch or  
isolation receptacle must prevent vehicle electrical  
circuits from being connected to two different power  
supplies at the same time (such as generator and  
dockside power).  
• Cut wiring to the required length and allow extra wire  
for junction box connections.  
• Carefully prepare conduit ends to prevent sharp  
edges from cutting through wiring insulation.  
• Route conduit so it does not interfere with generator  
movement.  
• If you use metallic conduit, vapor seal the end of the  
conduit where it enters the junction box. Do this  
because flexible metallic conduit is not vaporproof  
along its entire length.  
• Conductors must be rated 221° F (105° C) or must be  
of a larger conductor size.  
6.7.3 GENERATOR AC CONNECTIONS  
N
Generator AC output leads T1 (red), T2 (white) and T3  
(black) come out of the generator as shown in  
Figure 6.17. Leads T1 (red) and T3 (black) are “hot,”  
while T2 (white) is the grounded neutral lead. There is  
also a green lead that connects to ground in the junction  
box of the recreational vehicle.  
6.7.5 ISOLATING DIFFERENT POWER SOURCES  
N
Connections from the junction box must terminate in a  
double-pole, double-throw transfer switch (Figure 6.18,  
Page 33). An alternate method for isolating different  
power sources is by using an isolating receptacle  
(Figure 6.19, Page 33). Whichever method you use, you  
must be certain that both power sources are NOT con-  
nected at the same time.  
Figure 6.17 – Generator AC Output Leads  
T3  
T2  
T1  
6.7.6 POWER SUPPLY CORD  
N
Green  
(Ground)  
The power supply cord must comply with all applicable  
codes, standards and regulations. It must be large  
enough to handle the full amperage to which it will be  
subjected. (See page 33 for illustration.)  
6.7.7 GROUND FAULT CIRCUIT INTERRUPTERS  
N
The National Electrical Code (NFPA 70, 551-7) requires  
that you install ground fault circuit interrupters (GFCIs)  
on all external and some internal electrical receptacles.  
Contact your manufacturer or dealer for recommenda-  
tions.  
Line T1 (red) to T2 (white) is protected against overload  
by a 30-amp circuit breaker (CB1). Use this line-to-neu-  
tral connection separately to operate 120-volt, single-  
phase, 60 Hertz, AC loads requiring up to 3,300 watts  
of power for PrimePact 66G or 3,100 watts for  
PrimePact 66LP. Line T3 (black) to T2 (white) also is  
protected against overload by a 30-amp circuit breaker  
(CB2). Use this line-to-neutral connection separately to  
operate similar loads. However, be sure the total unit  
load does not exceed the maximum rating of the gener-  
ator. The neutral line (T2, white) on all units is a  
grounded neutral.  
6.8 BATTERY INSTALLATION  
6.8.1 RECOMMENDED BATTERY  
N
Install a battery that meets the following requirements:  
• The battery must be a 12-volt, automotive type  
storage battery.  
For prevailing ambient temperatures above 32° F (0°  
C), use a battery rated 70 amp-hours and capable of  
delivering 400 cold-cranking amperes.  
For prevailing ambient temperatures below 32° F (0°  
C), use a battery rated 95 amp-hours and capable of  
delivering 400 cold-cranking amperes.  
NOTE:  
Do NOT connect electrical loads in excess of any  
circuit breaker rating or you will develop prob-  
lems with circuit breaker tripping, which causes a  
loss of AC output. Also, do NOT exceed the gener-  
ator's rated wattage capacity. Add the watts or  
amperes of all lighting, appliance, tool and motor  
loads the generator will operate at one time. This  
total should be less than the unit's rated  
If the battery is to be used to power other vehicle  
accessories, as well as start the generator, you may  
need a battery with a larger capacity.  
wattage/amperage capacity.  
®
32 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 6 – Installation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
PRIMEPACT generators are rated at about 100 DC  
6.8.2 BATTERY CABLES  
N
amperes of cranking current.  
Using battery cables that are too long or too small in  
diameter may cause a drop in voltage, which causes  
starting problems. For the best cold weather starting,  
the voltage drop between battery terminals and the gen-  
erator connection point should not exceed 0.12 volts  
per 100 amperes of cranking current.  
Select battery cables based on (a) cable length and (b)  
prevailing ambient temperatures. Generally, the longer  
the cable and the colder the weather, the larger the cable  
size must be, as shown in the chart.  
Figure 6.18 — Transfer Switch Isolation Method  
Figure 6.19 — Installation With Isolation Receptacle  
®
Generac Power Systems, Inc. 33  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 6 – Installation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
CABLE LENGTH  
in Feet (meters)  
0 to 10 (0 to 3)  
11 to 15 (3.4 to 4.5)  
16 to 20 (4.5 to 6)  
6.9 OPTIONAL ACCESSORIES  
CABLE SIZE  
A plug-in receptacle (Figure 6.21) is provided on the  
generator set, above the muffler enclosure. Use this  
receptacle to connect an optional remote-mounted  
start/stop panel to the generator. Installation of such a  
panel will permit you to start and stop the generator  
engine from any convenient location inside the vehicle.  
2*  
0
000  
*For warm weather, use No. 2 cable up to 20 feet.  
Figure 6.21 – Remote Panel Plug-in Receptacle  
6.8.3 BATTERY CABLE CONNECTIONS  
N
1. Connect the battery cable from the battery post or  
terminal indicated by a POSITIVE, POS or (+) to the  
lug on the starter contactor (Figure 6.20).  
NOTE:  
Check to be sure the battery cable boot for the  
starter cable has been installed.  
2. Connect the battery cable from the battery post indi-  
cated by a NEGATIVE, NEG or (-) to the frame  
ground connection (Figure 6.20).  
3. Connect cables so the connectors are clean  
and tight.  
Figure 6.20 – Connecting Battery Cables  
6.9.1 REMOTE PANEL MODELS  
N
The remote panels mount a rocker type start/stop  
switch, a “Generator Run” advisory lamp and an  
hourmeter. The hourmeter should be used in conjunc-  
tion with the maintenance operations found in Part I of  
this manual.  
• Model 004057 includes the remote panel and a 10  
foot long, 4 wire harness.  
• Model 004184 includes the remote panel and a 30  
foot long, 4 wire harness.  
6.8.4 BATTERY COMPARTMENT  
N
Install the generator battery in its own, vented compart-  
ment. Place the battery compartment away from any  
source of heat, sparks or flame.  
Provide ventilation openings in the battery compart-  
ment. The minimum size of openings should be 2  
square inches at the top of the compartment. Mount the  
battery on a strong, rigid supporting structure, where  
leaks and spills of battery fluid will not cause damage.  
®
34 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 7 – Post Installation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
7. Let the unit run at no-load for a few minutes to sta-  
7.1 POST INSTALLATION TESTS  
bilize internal engine/-generator temperatures.  
Then, shut down the engine.  
NOTE:  
The air-cooled generator set was factory tested and  
adjusted. You should not be required to adjust the unit  
any further except under special circumstances.  
The generator set was thoroughly tested and adjust-  
ed at the factory before shipping. No additional  
adjustment should be necessary. Only qualified ser-  
vice technicians who have been trained should per-  
form adjustments outlined in this manual.  
Do not make any unnecessary adjustments.  
Factory settings are correct for most applications.  
When making adjustments, however, be careful to  
avoid overspeeding the engine.  
7.4 TESTING UNDER LOAD  
Apply electrical loads equal to about 75 to 100 percent  
of the unit's rated wattage/amperage capacity.  
7.2 BEFORE INITIAL START-UP  
Before starting, complete the following:  
Let the unit run at least 30 minutes with load applied.  
During this part of the test, check that the unit is not  
running excessively hot and that adequate cooling air-  
flow is available. You must not allow the unit to overheat  
during prolonged operation.  
1. Check the engine crankcase oil level and, if neces-  
sary, fill to the dipstick “FULLmark (cross-hatched  
area) with the recommended oil. Do not fill above  
the FULL mark.  
2. Check the fuel supply. Gas fuel lines must have been  
properly purged and leak tested in accordance with  
applicable fuel codes. All fuel shutoff valves in the  
fuel supply lines must be open.  
NOTE:  
The generator engine is equipped with a high tem-  
perature switch. The switch has normally closed  
(N.C.) contacts. When the engine temperature is too  
high, switch contacts close, and the engine shuts  
down automatically.  
If a liquid propane (LP) gas fuel system has been  
installed, it must be properly tested for leaks  
before operating the system in compliance with  
ANSI A119.2/NFPA 501C. No leakage is permitted.  
You must be sure no gasoline fuel vapors enter  
the vehicle interior.  
GENERAC RECOMMENDS THAT YOU TEST THE  
GENERATOR FOR ADEQUATE COOLING.  
7.3 INITIAL START  
When you are absolutely certain that the unit has been  
properly installed and prepared for use, start the engine  
as follows:  
1. Turn off all electrical loads. Do this by setting the  
generator’s main circuit breakers to their “OFF” (or  
open) position.  
2. Refer to Part I, Section 2.5, “Starting the Generator”  
(Page 8), for cranking and starting instructions. The  
engine may require more cranking for initial start-  
ing since the fuel lines have to be primed (use of the  
primer switch will shorten this time).  
3. Let the engine warm up for about five minutes to  
allow internal temperatures to stabilize.  
4. Carefully inspect the engine/generator for fuel, oil  
and exhaust system leaks. Before proceeding to the  
next step, correct any leakage immediately.  
5. When all tests and adjustments at no-load are com-  
pleted, apply electrical loads and check for proper  
operation under load. See Section 7.4. Run the unit  
at least 30 minutes with loads applied.  
6. Turn off all electrical loads by setting the generator’s  
main circuit breakers to their “OFF” (or open) posi-  
tion.  
®
Generac Power Systems, Inc. 35  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 7 – Post Installation  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
EXHAUST SYSTEM  
Exhaust system complies with all applicable codes.  
N
7.5 INSTALLATION CHECKLIST  
LOCATION AND SUPPORT  
N
Exhaust system is properly and safely installed.  
Generator is properly located.  
Generator is properly supported.  
Generator is properly restrained.  
ELECTRICAL CONNECTIONS  
N
Connections comply with local code requirements  
and all National Electrical Codes.  
GENERATOR COMPARTMENT  
N
Junction box is properly installed.  
Wiring meets all standards.  
Compartment construction is proper.  
Holes/Openings are vapor-sealed.  
Compartment size is correct.  
All connections are correct.  
Conduit is properly installed and sealed.  
Generator is properly bonded to the vehicle.  
Compartment is vapor-sealed.  
Sound insulation is correct.  
BATTERY INSTALLATION  
N
Floor cutouts are properly completed.  
Recommended battery is installed.  
Recommended cables are installed.  
Cables are clean and tight.  
COOLING AND VENTILATING AIR  
Airflow is adequate.  
N
Air inlet opening is correct.  
Compensate for restrictions.  
Check that installation has been tested.  
Cables are connected properly.  
Proper ventilation is provided.  
Terminals are coated with anti-corrosion grease, and  
terminal covers are positioned.  
GASOLINE FUEL SYSTEM  
N
OPTIONAL ACCESSORIES  
N
Fuel tank complies with all applicable codes.  
Check that remote start/stop panels (if used) are  
Fuel system is properly installed and checked  
installed properly.  
for leaks.  
Check that hourmeter kit (if used) is installed  
OPTIONAL LP GAS FUEL SYSTEM  
N
properly.  
Fuel system is properly installed and checked  
Check that any other options and accessories (if  
for leaks.  
used) are installed properly.  
Pressure at regulator inlet is correct.  
Rated flow of primary regulator is correct.  
All parts are properly installed.  
POST INSTALLATION TESTS  
Check that all tests are completed properly.  
N
Fuel system is properly tested/adjusted.  
DATE OF INSTALLATION ____________________________________________________  
NAME OF INSTALLER ______________________________________________________  
SIGNATURE OF INSTALLER ________________________________________________  
®
36 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 8 – Troubleshooting  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
8.1 TROUBLESHOOTING GUIDE  
PROBLEM  
Engine won’t crank.  
CAUSE  
1. 15 amp fuse blown.  
CORRECTION  
1. Replace blown fuse.  
2. Loose, or corroded or defective  
battery cable(s).  
2. Tighten, clean or replace,  
as necessary.  
3. Battery is discharged or defective.  
4. Defective starter contactor.  
5. Defective starter motor.  
3. Recharge or replace battery.  
4. Replace starter contactor.  
5. Replace starter motor.  
6. Defective Start/Stop switch.  
7. Defective Engine Control Board  
6. Replace switch.  
7. Contact an authorized service dealer.  
Engine cranks, won't start.  
1. Out of fuel.  
1. Refill fuel tank.  
2. Fuel shutoff valve is closed.  
3. Fuel pump not operating.  
4. Automatic choke not operating properly.  
5. Engine is flooded.  
2. Open fuel shutoff valve(s).  
3. Repair or replace pump.  
4. Repair, replace or adjust.  
5. Wait 5-10 minutes; try again.  
6. Replace filter if clogged.  
7. Clean, regap or replace as needed.  
8. Replace if defective.  
6. Fuel filter is clogged.  
7. Engine spark plugs defective..  
8. Bad ignition magneto on engine.  
9. Bad carburetor.  
9. Adjust, repair or replace.  
10. Clean or replace as needed.  
10. Dirty air cleaner.  
Engine starts hard, runs rough.  
1. Dirty engine air cleaner.  
2. Automatic choke is sticking.  
3. Defective spark plugs.  
1. Clean or replace as needed.  
2. Free choke linkage as needed.  
3. Clean, regap or replace.  
4. Replace it if defective.  
4. Defective ignition magneto.  
Engine starts, then shuts down.  
1. Engine oil level is low.  
2. Bad low oil pressure switch.  
3. Defective high temp switch.  
4. Water in fuel.  
1. Add oil as needed.  
2. Replace, if bad.  
3. Replace, if bad.  
4. Drain fuel tank and refill.  
No AC output voltage.  
1. Main breaker(s) open.  
1. Close main breaker(s).  
2. Reset transfer switch.  
2. Transfer switch (if so equipped) is  
set to wrong position.  
3. Failure in vehicle electrical system.  
4. Generator component failure.  
3. See vehicle manual.  
4. Contact an authorized service facility.  
®
Generac Power Systems, Inc. 37  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 9 — Electrical Data  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Electrical Schematic and Wiring Diagram – Drawing No. D3148-A  
®
38 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 9 — Electrical Data  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Electrical Schematic and Wiring Diagram – Drawing No. 0D3148-A  
®
Generac Power Systems, Inc. 39  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 10 — Exploded Views and Parts Lists  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Sheet Metal – Drawing No. 0D3150-A  
®
40 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 10 — Exploded Views and Parts Lists  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Sheet Metal – Drawing No. 0D3150-A  
ITEM  
PART NO.  
QTY.  
DESCRIPTION  
1
2
---------  
1
1
SEE ENGINE EXPLODED VIEW of ENGINE  
KEY-WOODRUFF 6 x 22MM  
BEVELLED WASHER  
099258  
067198N  
067890  
087865  
0A4456  
086313  
056893  
087750  
074916  
074908  
073190  
078858  
078859  
074902  
066476  
073191  
042907  
022129  
075246  
0742600133  
074900  
073186  
081108  
022717B  
022717A  
067866A  
077001A  
073132  
087858A  
029289  
087858B  
050277  
3
1
4
1
HEX NUT  
5
1
PLUG, FLYWHEEL ACCESS  
3/8" SPECIAL LOCK WASHER  
HOUSING, ENGINE TOP  
SCREW (CRIMPTITE) NO. 10-24 x 1/2"  
SCROLL, FLYWHEEL  
6
1
7
1
8
23  
1
10  
11  
12  
13  
14  
15  
16  
17  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
33  
34  
35  
36  
1
COVER, BASE CYL. #2  
SCREW (TAPTITE) M5 x 10MM  
WRAPPER CYL. #2  
9
1
1
COVER, VALLEY  
WRAPPER, CYL. #1  
WRAPPER, BARREL  
1
2
4
HHCS/LW-M6 x 1.0 x 12MM  
COVER, BASE CYL. #1  
CAPSCREW, HEX HD.-M8 x 1.25 x 16MM  
LOCK WASHER-M8  
1
2
2
4
SCREW (TAPTITE) 3/8"-16 x 1-1/4"  
WIRE ASSEMBLY-NO, 16  
STARTER COVER  
1
1
1
WRAPPER, CRANKCASE  
BUSHING, SNAP  
GROMMET -RUBBER  
1
1
3
GROMMET -RUBBER  
O-RING  
1
1
PLUG, OIL FILL  
BOOT, SPARK PLUG  
2
1
GROUND WIRE ASSEMBLY-CYL. #1  
FOAM TAPE  
2FT.  
1
GROUND WIRE ASSEMBLY-CYL. #2  
OIL DRAIN DECAL  
1
®
Generac Power Systems, Inc. 41  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 10 — Exploded Views and Parts Lists  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Base and Pulleys – Drawing No. 0D3151-A  
50  
12  
13  
10  
28  
29  
66  
2
4
1
28  
51  
14  
28  
38  
95  
52  
52  
9
7
90  
6
91  
49  
93  
TO ENGINE  
83  
47  
14  
15  
44  
45  
7
34  
73  
35  
96  
84  
86  
88  
68  
3
10  
6
43  
36  
46  
41  
19  
89  
83  
92  
5
94  
79  
23  
54  
5
25  
76  
67  
61  
60  
77  
28  
32  
30  
87  
33  
79  
3
20  
82  
80  
83  
81  
64  
85  
79  
62  
65  
69  
59  
5
6
28  
74  
57  
®
42 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 10 — Exploded Views and Parts Lists  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Base and Pulleys – Drawing No. 0D3151-A  
ITEM PART NO. QTY. DESCRIPTION  
ITEM PART NO.  
QTY. DESCRIPTION  
1
2
086318  
090141  
046911  
025017  
046526  
022129  
072391  
077603  
022259  
052858  
051730  
029459  
075215  
073146  
075209  
073174  
079678  
040976  
072383  
090859  
075224B  
073106B  
075216  
049451  
042633  
077017  
073118  
074906  
091123  
072375  
073185  
022097  
077682  
075242  
049813  
045757  
090475  
087769  
087768  
087770  
0A8475  
026925  
075710A  
074958  
067871  
0A5508  
075711  
022413  
1
1
4
8
2
8
2
2
2
6
2
2
2
4
2
1
2
4
2
1
1
1
1
1
1
1
1
7
1
1
1
7
1
4
2
2
1
1
1
1
1
1
1
1
1
1
1
1
BASE, MOUNTING  
GROUND CABLE  
50  
51  
52  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
0A5802  
022237  
022145  
092120  
0742600133  
073179  
070185  
0A8584  
074948  
074950  
074951  
073134  
038750  
074949  
1
8
2
2
1
1
1
1
3
1
1
1
3
1
TINNERMAN CLIP  
WASHER LOCK 3/8  
3
MOUNT VIBR 1.50X1.38 X 3/8-16)  
SCREW HHC 3/8-16 X 1/2 G5  
WASHER LOCK M10  
WASHER FLAT 5/16 ZINC  
NUT LOCK TRIC M6 X 1.0 Y/ZNC  
CABLE, STARTER  
4
5
6
WASHER LOCK M8-5/16  
SKID, RUBBER MOUNT  
SAFETY BOLT 5/16-18 x 3 1/2"  
NUT HEX 5/16-18 STEEL  
NUT LOCK M8  
OIL FILTER SUPPORT  
7
FILTER, OIL (FRAM#PH3614)  
10 PSI-SWITCH, OIL PRESSURE  
FITTING COMP 5/16 X1/8 SLF-ALGN  
TUBE, OUTER OIL  
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
49  
SCREW HHC M8-1.25 X 60 G8.8  
SPRING, BELT TENSION  
WASHER, SPRING CNTR  
SLIDE (NYLON)  
TUBE, INNER OIL  
ADAPTOR, OIL FILTER ADAPTER  
SCREW HHC M6-1.0 X 30 G8.8  
ELBOW 90D TUBE CMP 5/16 X  
1/8NPT  
SUPPORT, NYLON SLIDE  
MANIFOLD, EXHAUST  
RING, SEALING  
65  
66  
67  
68  
69  
70  
71  
72  
73  
74  
75  
76  
77  
78  
79  
80  
81  
82  
068548  
0C4006  
029289  
022158  
075281  
0C1085  
043182  
022152  
075237  
0D1624  
075474  
090800  
094670  
075226  
056893  
075229  
0D3158  
079246  
1
1
-
GASKET, OIL FILTER ADAPTER  
CABLE, 30" LONG  
SCREW SHC M8-1.25 X 20 G12.9  
GASKET, COLLECTOR PAN  
COVER PLATE -EXTERNAL  
PULLEY, ENGINE  
TAPE ELEC NON-UL FOAM 1/16X1/2  
NUT HEX #10-32 STEEL  
SWITCH, HIGH TEMPERATURE  
SCREW PPHM M3-0.5 X 8  
WASHER LOCK M3  
2
1
2
2
2
4
1
1
1
1
1
23  
1
1
6
PULLEY, ALTERNATOR  
BELT (POLY V 4L)-40"  
WASHER LOCK #10  
WASHER FLAT SPECIAL .406 I.D.  
SCREW HHC 3/8-24 X 1 G5  
GUIDE, BLOWER HOUSING  
SCREW HHC 3/8-24 X2-1/4 G8  
SCREW TAPTITE M6 X 20 BP  
BRACKET-FUEL PUMP  
WASHER, SPRING RETAINER  
BOOT, OIL PRESSURE SWITCH  
BOOT, TEMPERATURE SWITCH  
ELBOW, EXHAUST  
CLAMP, EXHAUST  
COVER, AIR  
HOUSING, BLOWER  
SCREW CRIMPTITE #10-24 X 1/2  
SLIDE PAN, GASKET  
SLIDE PAN  
SPACER ROLL 2.36 X.230 X.042 BRZ  
WASHER LOCK M6-1/4  
SCREW HHC M5-0.8 X 80 G8.8  
SPRING, GENERATOR SET MT  
NUT HEX M6 -1.0 G8 YEL CHR  
SCREW HHC M6-1.0 X 25 G8.8  
FUEL PUMP  
CAPSCREW, HEX HEAD- M6-1.00 x  
16mm WITH LOCK WASHER  
WASHER FLAT 1/4 ZINC  
BOOT, BATTERY CABLE  
COVER, EXHAUST OUTLET  
NUT HEX 5/16-24 STEEL  
GASKET, EXHAUST OUTLET  
BOOT, BATTERY CABLE  
CONTACTOR, STARTER  
LOCKWASHER, SPECIAL ¼"  
CLAMP VINYL .25 X .28 Z  
WASHER FLAT 3/8 ZINC  
FLANGE NUT, (SPECIAL) 5/16"-18  
WASHER FLAT #10 ZINC  
DECAL-GROUND  
83  
84  
85  
86  
87  
88  
89  
90  
91  
92  
93  
94  
95  
96  
022473  
0D1741A  
072384C  
024114  
077643  
0D1741  
0D1227  
0A1658  
090088  
022131  
081105  
023897  
067210  
045756  
5
1
1
2
1
2
1
3
1
1
2
6
1
9
FUEL FILTER  
FITTING COMP 1/4X1/8 SLF-ALGN  
FUEL LINE  
SPECIAL LOCK WASHER, M5  
PLUG STD PIPE 3/8 STEEL SQ HD  
TUBE, OIL FILL AND DRAIN  
CAP & DIPSTICK ASSEMBLY  
O-RING, CAP  
OIL FILL TUBE GASKET  
PIPE, OIL DRAIN ADAPTOR  
SCREW HHC 1/4-20 X 1 G5  
SCREW TAPTITE M6X10 YEL CHR  
®
Generac Power Systems, Inc. 43  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 10 — Exploded Views and Parts Lists  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Base and Pulleys – Drawing No. 0D3154-A  
37  
12  
13  
11  
10  
28  
66  
2
4
1
40  
14  
84  
39  
3
3
9
7
6
50  
38  
88  
54  
53  
TO ENGINE  
41  
83  
47  
79  
14  
15  
44  
45  
7
34  
73  
35  
49  
32  
46  
10  
48  
43  
36  
17  
8
23  
5
61  
60  
76  
27  
16  
67  
32  
67  
77  
28  
72  
32  
30  
87  
33  
79  
20  
64  
2
78  
80  
81  
85  
70  
71  
79  
69  
59  
58  
56  
28  
74  
57  
®
44 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 10 — Exploded Views and Parts Lists  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Base and Pulleys – Drawing No. 0D3154-A  
ITEM PART NO. QTY. DESCRIPTION  
ITEM PART NO. QTY. DESCRIPTION  
1
2
86318  
90141  
46911  
25017  
46526  
22129  
72391  
77603  
22259  
52858  
51730  
29459  
75215  
73146  
75209  
73174  
79678  
40976  
72383  
90859  
75224-B  
73106-B  
75216  
49451  
42633  
77017  
73118  
74906  
72375  
73185  
22097  
77682  
75242  
49813  
45757  
A5802  
22413  
22145  
22237  
A8475  
26925  
75710-A  
74958  
67871  
A5508  
1
1
4
8
2
8
2
2
2
6
2
2
2
4
2
1
2
4
2
1
1
1
1
1
1
1
1
5
1
1
7
1
4
2
2
1
1
2
8
1
1
1
1
1
1
BASE, MOUNTING  
GROUND CABLE  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
66  
67  
68  
69  
70  
71  
72  
73  
74  
75  
76  
77  
78  
79  
80  
81  
82  
75711  
92120  
D1227  
D1741  
24114  
D1741A  
22152  
22158  
133-74260  
73179  
70185  
A8584  
74948  
74950  
74951  
73134  
38750  
74949  
68548  
C4006  
29289  
22131  
75281  
C1085  
43182  
45756  
75237  
D1624  
75474  
90800  
94670  
75226  
56893  
75229  
D3158  
79246  
1
2
1
2
2
1
2
2
1
1
1
1
3
1
1
1
3
1
1
1
--  
1
1
2
2
9
4
1
1
1
1
1
23  
1
1
6
PIPE, OIL DRAIN ADAPTOR  
NUT LOCK TRIC M6 X 1.0 Y/ZNC  
STARTER CONTACTOR  
3
MOUNT, (RUBBER)  
SCREW HHC 3/8-16 X 1/2 G5  
WASHER LOCK M10  
4
BOOT, STARTER CONTACTOR  
NUT HEX 5/16-24 STEEL  
BOOT, BATTERY CABLE  
WASHER LOCK #10  
5
6
WASHER LOCK M8-5/16  
SKID, RUBBER MOUNT  
SAFETY BOLT 5/16"-18 x 3-1/2"  
NUT HEX 5/16-18 STEEL  
NUT LOCK M8  
7
8
NUT HEX #10-32 STEEL  
CABLE, STARTER  
OIL FILTER SUPPORT  
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
SCREW HHC M8-1.25 X 60 G8.8  
SPRING, BELT TENSION  
WASHER, SPRING CNTR  
SLIDE (NYLON)  
FILTER, OIL (FRAM#PH3614)  
10 PSI-SWITCH, OIL PRESSURE  
FITTING COMP 5/16X1/8 SLF-ALGN  
TUBE, OUTER OIL  
SUPPORT, NYLON SLIDE  
MANIFOLD, EXHAUST  
RING, SEALING  
TUBE, INNER OIL  
ADAPTOR, OIL FILTER ADAPTER  
SCREW HHC M6-1.0 X 30 G8.8  
ELBOW 90D TUBE CMP 5/16X1/8NPT  
GASKET, OIL FILTER ADAPTER  
CABLE,BATTERY  
SCREW SHC M8-1.25 X 20 G12.9  
GASKET, COLLECTOR PAN  
COVER PLATE -EXTERNAL  
PULLEY, ENGINE  
TAPE ELEC NON-UL FOAM 1/16X1/2  
WASHER FLAT 3/8 ZINC  
SWITCH, HIGH TEMPERATURE  
SCREW PPHM M3-0.5 X 8  
WASHER LOCK M3  
PULLEY, ALT.  
BELT (POLY V 4L)-40"  
WASHER FLAT SPECIAL .406 I.D.  
SCREW HHC 3/8-24 X 1 G5  
GUIDE, BLOWER HOUSING  
SCREW HHC 3/8-24X2-1/4 G8  
SCREW TAPTITE M6X20 BP  
HOUSING, BLOWER  
SCREW TAPTITE M6X10 YEL CHR  
WASHER, SPRING RETAINER  
BOOT, OIL PRESSURE SWITCH  
BOOT, TEMPERATURE SWITCH  
ELBOW, EXHAUST  
SPACER ROLL 2.36X.230X.042 BRZ  
WASHER LOCK M6-1/4  
SCREW HHC M5-0.8 X 80 G8.8  
SPRING, GENERATOR SET MT  
NUT HEX M6 -1.0 G8 YEL CHR  
SCREW HHC M6-1.0 X 25 G8.8  
TINNERMAN CLIP  
EXHAUST CLAMP  
COVER, AIR  
SCREW CRIMPTITE #10-24 X 1/2  
SLIDE PAN, GASKET  
SLIDE PAN  
CAPSCREW, HEX HEAD- M6-1.00 x  
16mm WITH LOCK WASHER  
WASHER FLAT 1/4 ZINC  
DECAL-GROUND  
SCREW HHC 1/4-20 X 1 G5  
WASHER FLAT 5/16 ZINC  
WASHER LOCK 3/8  
83  
84  
85  
86  
87  
88  
89  
90  
22473  
67210  
72384-C  
23897  
77643  
81105  
90088  
A1658  
7
1
1
6
1
2
1
2
WASHER SPECIAL LOCK M5  
PLUG STD PIPE 3/8 STEEL SQ HD  
TUBE, OIL FILL AND DRAIN  
CAP & DIPSTICK ASSEMBLY  
O-RING, CAP  
COVER, EXHAUST OUTLET  
WASHER FLAT #10 ZINC  
GASKET, EXHAUST OUTLET  
FLANGE NUT, (SPECIAL) 5/16"-18  
CLAMP VINYL .25 X .28 Z  
LOCKWASHER, SPECIAL ¼"  
OIL FILL TUBE GASKET  
®
Generac Power Systems, Inc. 45  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 10 — Exploded Views and Parts Lists  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Alternator and Control Panel – Drawing No. 0D3149-C  
45  
57  
44  
31  
58  
51  
20  
8
12  
45  
44  
21  
TO ENGINE  
GROUND  
38  
63  
11  
22  
40  
40  
17  
23  
6
18  
14  
60  
29  
13  
40  
10  
9
36  
15  
14  
15  
16  
61  
37  
43  
34  
62  
18  
24  
63  
3
17  
19  
35  
4
49  
44  
48  
55  
42  
2
4
47  
5
1
46  
50  
7
2,53  
25  
28  
27  
26  
59  
26  
39  
56  
30  
31  
64  
33  
30  
31  
®
46 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 10 — Exploded Views and Parts Lists  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Alternator and Control Panel – Drawing No. 0D3149-C  
ITEM PART NO. QTY. DESCRIPTION  
ITEM PART NO. QTY. DESCRIPTION  
1
2
0C9675  
077005H  
077004H  
087844H  
087845H  
073159  
031971  
0C9674  
077006  
052858  
066386  
066849  
027756  
086314  
075234  
022473  
022097  
055816  
090141  
0A1658  
074906  
092234  
055440  
022129  
045771  
086316  
053650  
0C4258  
075244  
023484S  
074908  
075476  
022264  
065795  
090987  
1
1
1
1
1
1
1
1
4
4
1
2
4
1
1
2
5
1
2
2
4
1
2
4
4
1
1
1
1
1
1
3
4
1
2
LOWER BEARING CARRIER  
ROTOR ASSEM. PP55  
ROTOR ASSEM. PP66  
STATOR ASSEM. 55  
34  
35  
36  
37  
38  
39  
40  
41  
086317A  
075235  
082737  
049813  
049815  
043182  
0A8475  
053623  
054502  
0D2724  
083049  
022152  
051716  
090144  
090145  
090145  
025105  
086315  
090734  
1
2
4
4
1
2
3
1
1
2
1
6
4
1
1
1
4
1
4
PANEL SUPPORT BRACKET  
M5-0.8 x 30 LG. CAPSCREW  
VIBRATION MOUNT  
3
M6-1.0 HEX NUT  
M5-08 x 16 LG. HEX HD. CAPSCR.  
M3-LOCK WASHER  
STATOR ASSEM. 66  
BALL BEARING  
4
5
BALL BEARING  
UPPER BEARING CARRIER  
STUD-STATOR  
#10-SPECIAL LOCK WASHER  
C/BREAKER 2.5A PP55  
C/BREAKER 3.0A PP66  
BOOT, ROCKER SWITCH  
REGULATOR VOLTAGE  
M5-LOCK WASHER  
6
7
8
M8-1.25 FLANGE LOCK NUT  
BRUSH HOLDER  
42  
43  
44  
45  
46  
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
M5-0.8 x 16 LG. TAPTITE  
NYLON WASHER  
M5-0.8 HEX NUT  
GENERATOR TOP HOUSING  
RESISTOR  
C/BREAKER 20A. PP55  
C/BREAKER 30A. PP66  
C/BREAKER 30A. (ALL UNITS)  
#6-32 x ¼" SCREW W/LOCK WASHER  
PANEL COVER  
¼"/ M6-FLAT WASHER  
¼"/ M6-LOCK WASHER  
M6-1.0 x 70 LG. CAPSCREW  
GROUND CABLE  
47  
48  
49  
50  
M4-0.7 x 12 LG. CAPSCR.W/LOCK-  
WASHER & FLAT WASHER  
#6-FLAT WASHER  
SPECIAL LOCK WASHER, ¼"  
M6-1.0 x 20 LG. TAPTITE  
CONTROLLER P.C.B.  
M5-0.8 x 25mm CAPSCREW  
5/16"/ M8 LOCKWASHER  
M8-1.25 HEX NUT  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
022985  
032300  
022676  
087798  
092113  
075210A  
0A8475A  
051715  
090157  
084867  
089438A  
089438B  
031791  
023897  
031879  
1
1
1
1
1
1
1
1
1
4"  
1
1
1
3
2
FUSE HOLDER  
FUSE AGC-15A.  
SWITCH S.P.D.T. 6A.-(START-STOP)  
SWITCH S.P.D.T.-(FUEL PUMP)  
TERMINAL BLOCK  
PANEL SHEET METAL  
4-PIN CONNECTOR  
#8 SPECIAL LOCK WASHER  
M4-0.7 HEX NUT  
CONDUIT ASSEMBLY  
ASSEMBLY, REMOTE CABLE  
BUSHING  
DECAL, CB RATING 30A.  
U- CHANNEL, RUBBER  
DECAL, CUSTOMER CON. PP55  
DECAL, CUSTOMER CON. PP66  
CLAMP, HOSE  
M5-0.8 x 10 LONG TAPTITE  
M4-0.7 x 16 LG. CAPSCREW  
#8/ M4-LOCK WASHER  
BATTERY CHARGER RECTIFIER  
M3-0.5 x 12 LG. PPHMS  
62  
63  
64  
#10/ M5-FLAT WASHER  
WASHER FLAT #4  
®
Generac Power Systems, Inc. 47  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 10 — Exploded Views and Parts Lists  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Exploded View - Engine Common Parts – Drawing No. 079216-G  
®
48 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 10 — Exploded Views and Parts Lists  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Exploded View - Engine Common Parts – Drawing No. 079216-G  
ITEM PART NO. QTY.  
DESCRIPTION  
ITEM PART NO. QTY.  
DESCRIPTION  
1
2
069331  
069333  
067805  
0851100101  
0851100102  
070169  
069332  
0851100104  
072315  
089967  
070596  
069336  
069325  
067888  
072334  
075247  
067924  
067878  
075248  
075249  
069327  
075250  
089972  
072346  
069316  
069317  
067816  
069320  
070513  
070584  
070530  
072358  
069379  
067895  
070594  
067158  
068574  
068554A  
068573  
070506  
070554  
070568  
1
1
1
1
1
4
2
1
1
1
1
1
8
2
1
1
1
9
2
2
4
2
2
4
2
2
4
4
4
4
1
1
2
2
2
4
1
1
1
1
1
4
CYLINDER ASSEMBLY  
SLEEVE BEARING  
OIL SEAL  
43  
44  
45  
46  
47  
50  
51  
52  
53  
57  
59  
60  
61  
62  
64  
65  
66  
73  
74  
75  
76  
78  
81  
82  
83  
84  
85  
86  
88  
89  
90  
91  
92  
93  
94  
95  
97  
98  
99  
100  
101  
102  
075253  
067885  
075254  
070535  
0C2881  
067891  
075236  
072347  
075258  
066480  
072361  
072362  
070199  
072366  
072365  
068555  
067806  
068572  
075272  
070122  
067910  
067813  
070592  
073123  
070593  
0C3633  
067156  
069341  
070597  
072305  
067920  
069328  
070547  
070536  
070577  
070599  
070566  
075271  
067897  
091481  
091480  
0D1198  
4
4
4
1
1
1
4
2
1
1
1
1
1
1
1
2
4
2
2
4
2
4
1
1
1
1
2
1
1
1
2
1
1
1
4
4
4
1
2
1
1
1
WASHER VALVE COVER SEAL  
M6 NYLON NUT  
3
VALVE ADJUST SCREW  
OIL SCREEN  
4
NO. 1 CYLINDER HEAD ASSEMBLY  
NO. 2 CYLINDER HEAD ASSEMBLY  
SEALING WASHER  
5
STARTER MOTOR (NOT SHOWN)  
IGNITION COIL  
6
7
CYLINDER HEAD GASKET  
BREATHER ASSEMBLY  
BREATHER GASKET  
IGNITION ARMATURE SCREW  
SPARK PLUG  
8
9
ENGINE GASKET KIT  
AIR CLEANER GASKET  
GOVERNOR SHAFT BUSHING  
GOVERNOR SHAFT BUSHING  
BREATHER BAFFLE  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
BREATHER SCREW  
BREATHER TUBE  
OIL SUMP GASKET  
CYLINDER HEAD BOLT  
3/8” NPT OIL DRAIN PLUG  
CRANK SHAFT ASSEMBLY  
OIL SUMP ASSEMBLY  
OIL SEAL  
COTTER PIN  
GOVERNOR SHAFT WASHER  
CRANKCASE DOWEL  
CYLINDER HEAD DOWEL  
OIL PUMP SCREW  
OIL SUMP BOLT  
STANDARD PISTON ASSEMBLY  
STANDARD PISTON RING SET  
PISTON PIN RING  
SPARK PLUG TERMINAL  
VALVE STEM SEAL  
INTAKE VALVE SEAT  
PISTON PIN ASSEMBLY  
CONNECTING ROD ASSEMBLY  
CONNECTING ROD BOLT  
EXHAUST VALVE  
VALVE GUIDE  
AIR CLEANER BASE  
AIR FILTER (NOT SHOWN)  
AIR CLEANER COVER  
AIR CLEANER COVER SCREW  
AIR CLEANER BASE SCREW  
PRECLEANER ELEMENT  
AIR INLET TUBE  
INTAKE VALVE  
VALVE SPRING  
VALVE SPRING RETAINER  
VALVE KEEPER  
VALVE TAPPET  
BREATHER DEFLECTOR  
VALVE COVER GASKET  
VALVE COVER  
CAMSHAFT ASSEMBLY  
INTAKE MANIFOLD  
CARBURETOR MOUNTING GASKET  
INTAKE MANIFOLD GASKET  
CARBURETOR MOUNTING BOLT  
INTAKE MANIFOLD MOUNTING BOLT  
1/8” NPT PLUG PIPE  
OIL PUMP ASSEMBLY  
GOVERNOR SLIDER  
PUSH ROD  
ROCKER ARM ASSEMBLY  
ROCKER ARM SUPPORT  
VALVE OVERHAUL KIT  
EXHAUST GASKET (NOT SHOWN)  
GASKET & CAP ASSEMBLY  
ROCKER ARM COVER  
GOVERNOR CRANK  
GOVERNOR SHAFT SEAL  
OIL PUMP O-RING  
OIL GALLEY O-RING  
CARBURETOR SPACER  
ROCKER ARM STUD  
®
Generac Power Systems, Inc. 49  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 10 — Exploded Views and Parts Lists  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Carburetor – Drawing No. 093753-H  
®
50 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 10 — Exploded Views and Parts Lists  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
Carburetor – Drawing No. 093753-H  
ITEM  
PART NO.  
QTY.  
DESCRIPTION  
1
2
073112B  
074962C  
074962G  
070155  
070108  
056893  
074961  
047227  
037398  
073131  
066476  
070575  
070125  
073374  
074947  
089473  
091306  
077091  
031879  
022159  
072536  
087770  
074946  
030340  
0C2338B  
0C2338  
0C2338D  
075252  
0A7782A  
040173  
066829  
075944  
070594  
077075  
1
1
1
1
1
5
1
1
1
1
2
2
1
1
1
1
1
1
4
4
4
1
1
1
1
1
1
1
1
2
2
1
2
1
CARBURETOR ASSEMBY  
SPRING, GOVERNOR - GREEN (PP55G/LP, PP66G/LP)  
SPRING, GOVERNOR - BROWN (PP70G/LP, Q70G)  
LEVER, GOVERNOR  
3
4
ROD, GOVERNOR TO CARBURETOR  
SCREW CRMPTIT 10-24 X ½  
BRACKET, GOVERNOR ADJUSTER  
SCREW, GOVERNOR ADJUSTER  
NUT, HEX LOCK (NYLON)  
5
6
7
8
9
BRACKET, AIR CLEANER SUPPORT  
SCREW, HHSW M6-1.0 X 12  
SCREW, HHSW M6-1.0 X 25  
SPRING, ANTI-LASH  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
21  
22  
23  
25  
26  
BRACKET, CHOKE SUPPORT  
ROD, CHOKE CONTROL  
BI-METAL ASSEMBLY, CHOKE  
SOLENOID, CHOKE  
HAIR PIN, COTTER  
WASHER FLAT #4  
WASHER LOCK #4  
SCREW, PPMS #4-40 X ¼  
TUBE FUEL GASOLINE - 5/16" I.D.  
LINK, CHOKE  
HOSE ¼" I.D., 4.5" LONG  
DECAL, AIR CLEANER PRIMEPACT 66G  
DECAL, AIR CLEANER PRIMEPACT 55G  
DECAL, AIR CLEANER PRIMEPACT 70G  
KIT, CARBURETOR OVERHAUL-NOT SHOWN  
FLYWHEEL ASSEMBLY  
27  
28  
29  
30  
31  
32  
33  
CLAMP, HOSE (SCREW TYPE)  
RIVET-1/8" DIAMETER x 1/8" LONG  
BRACKET, GOVERNOR SPRING  
SCREW HHC M6-1.0 X 93 WITH LOCK WASHER  
COVER, CHOKE COIL  
®
Generac Power Systems, Inc. 51  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 10 — Exploded Views and Parts Lists  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
LP Carburetor & Air Cleaner – Drawing No. 0A4029-G  
13  
25  
1
11  
22  
18  
27  
29  
19  
4
21  
3
5
2
2
7
3
4
28  
4
12  
9
8
10  
9
11  
10  
ITEM PART NO. QTY. DESCRIPTION  
ITEM PART NO. QTY. DESCRIPTION  
1
2
0A1662A  
057822  
074994  
026307  
026915  
075211  
0A2666  
0A5198  
049813  
022097  
047411  
038750  
037398  
074961  
056893  
047227  
074962C  
074962G  
1
2
1
3
1
1
1
1
4
4
2
2
1
1
5
1
1
1
CARB. V-TWIN L/P  
HOSE CLAMP  
18  
19  
066476  
2
M6-1.0 X 12MM HEX SCREW W/LOCK  
WASHER  
3
1/2 I.D. X 10" LONG HOSE  
STREET ELBOWS  
3/4 PIPE NIPPLE  
0C2338E  
0C2338C  
0C2338A  
075944  
0A7782A  
070155  
076242  
070125  
070108  
028739  
055162  
073131  
061696  
0A5606  
1
1
1
1
1
1
2
1
1
4
AIR CLEANER DECAL-PRIMEPACT 70LP  
AIR CLEANER DECAL-PRIMEPACT 66LP  
AIR CLEANER DECAL-PRIMEPACT 55LP  
GOVERNOR SPRING BRACKET  
FLYWHEEL ASSEMBLY  
4
5
6
GASEOUS FUEL REGULATOR  
GASEOUS FUEL SOLENOID  
REGULATOR MOUNTING BRACKET  
M6 HEX NUT  
20  
21  
22  
23  
24  
25  
+
7
8
GOVERNOR LEVER  
1/8 I.D. X 1/8 RIVET  
9
10  
11  
12  
13  
14  
15  
16  
17  
M6 LOCK WASHER  
ANTI-LASH SPRING  
GOVERNOR-TO-CARBURETOR ROD  
4" LONG TIE WRAP  
M6-1.0 X 16MM HEX HD. CAPSCR.  
M6-1.0 X 30MM HEX HD. CAPSCR.  
HEX LOCK NUT (NYLON)  
GOVERNOR ADJUSTER BRACKET  
#10-24 X 1/2 SCREW  
+
9CC PIPE SEALANT  
27  
28  
29  
1
1
1
AIR CLEANER SUPPORT BRACKET  
BARBED 90 DEG. 3/8 X 1/2  
ELBOW 90 DEG 3/8 X 3/4  
GOVERNOR ADJUSTER SCREW  
GOVERNOR SPRING (PP55G/LP, PP66G/LP)  
GOVERNOR SPRING (PP70G/LP, Q70G)  
+ NOT SHOWN  
®
52 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 11 — Notes  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
®
Generac Power Systems, Inc. 53  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 11 — Notes  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
®
54 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 11 — Notes  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
®
Generac Power Systems, Inc. 55  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 12 – Warranty  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
CALIFORNIA AND FEDERAL EMISSION CONTROL WARRANTY STATEMENT  
YOUR WARRANTY RIGHTS AND OBLIGATIONS  
The California Air Resources Board (CARB) and the United States Environmental Protection Agency (EPA), together with  
Generac Power Systems, Inc. (Generac), are pleased to explain the Emission Control System Warranty on your new engine.*  
New utility, and lawn and garden equipment engines must be designed, built and equipped to meet stringent anti-smog stan-  
dards for the state of California and the federal government. Generac will warrant the emission control system on your  
engine for the periods of time listed below provided there has been no abuse, neglect, unapproved modification or improp-  
er maintenance of your engine.  
Your emission control system may include parts such as the carburetor, ignition and exhaust systems. Generac will repair  
your engine at no cost to you for diagnosis, replacement parts and labor, should a warrantable condition occur.  
MANUFACTURER’S EMISSION CONTROL SYSTEM WARRANTY COVERAGE:  
Emissions control systems on 1997 and later model year engines are warranted for two years as hereinafter noted. If, dur-  
ing such warranty period, any emission-related component or system on your engine is found to be defective in materials or  
workmanship, repairs or replacement will be performed by a Generac Authorized Warranty Service Facility.  
PURCHASER’S/OWNER’S WARRANTY RESPONSIBILITIES:  
As the engine purchaser/owner, you are responsible for the completion of all required maintenance as listed in your factory  
supplied Owner’s Manual. For warranty purposes, Generac recommends that you retain all receipts covering maintenance  
on your engine. However, Generac cannot deny warranty solely because of the lack of receipts or for your failure to ensure  
the completion of all scheduled maintenance.  
As the engine purchaser/owner, you should, however, be aware that Generac may deny any and/or all warranty coverage or  
responsibility if your engine, or a part/component thereof, has failed due to abuse, neglect, improper maintenance or unap-  
proved modifications, or the use of counterfeit and/or ‘grey market’ parts not made, supplied or approved by Generac.  
You are responsible for presenting your engine to a Generac Authorized Warranty Service Facility as soon as a prob-  
lem occurs. The warranty repairs should be completed in a reasonable amount of time, not to exceed 30 days.  
Warranty service can be arranged by contacting either your selling dealer or a Generac Authorized Warranty Service Facility.  
To locate the Generac Authorized Warranty Service Facility nearest you, call our toll-free number:  
1-800-333-1322  
IMPORTANT NOTE: This warranty statement explains your rights and obligations under the Emission Control System  
Warranty (ECS Warranty), which is provided to you by Generac pursuant to California and federal law. See also the “Generac  
Limited Warranties for Generac Power Systems, Inc.,” which is enclosed herewith on a separate sheet, also provided to you  
by Generac. The ECS Warranty applies only to the emission control system of your new engine. If there is any conflict in  
terms between the ECS Warranty and the Generac Warranty, the ECS Warranty shall apply except in circumstances where  
the Generac Warranty may provide a longer warranty period. Both the ECS Warranty and the Generac Warranty describe  
important rights and obligations with respect to your new engine.  
Warranty service can be performed only by a Generac Authorized Warranty Service Facility. When requesting warranty ser-  
vice, evidence must be presented showing the date of the sale to the original purchaser/owner. The purchaser/owner shall  
be responsible for any expenses or other charges incurred for service calls and/or transportation of the product to/from the  
inspection or repair facilities. The purchaser/owner also shall be responsible for any and/or all damages or losses incurred  
while the engine is being transported/shipped for inspection or warranty repairs.  
If you have any questions regarding your warranty rights and responsibilities, you should contact Generac at the fol-  
lowing address:  
ATTENTION WARRANTY DEPARTMENT  
GENERAC POWER SYSTEMS, INC.  
P.O. BOX 297  
WHITEWATER, WI 53190  
Part 1  
®
56 Generac Power Systems, Inc.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 12 – Warranty  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
EMISSION CONTROL SYSTEM WARRANTY  
Emission Control System Warranty (ECS Warranty) for 1997 and later model year engines:  
(a) Applicability: This warranty shall apply to 1997 and later model year engines. The ECS Warranty Period shall begin on  
the date the new engine or equipment is purchased by/delivered to its original, end-use purchaser/owner and shall contin-  
ue for 24 consecutive months thereafter.  
(b) General Emissions Warranty Coverage: Generac warrants to the original, end-use purchaser/owner of the new engine or  
equipment, and to each subsequent purchaser/owner, that each of its engines is ...  
(1) Designed, built and equipped so as to conform with all applicable regulations adopted by the EPA and CARB pursuant  
to their respective authority, and  
(2) Free from defects in materials and workmanship which, at any time during the ECS Warranty Period, may cause a war-  
ranted emissions-related part to fail to be identical in all material respects to the part as described in the engine manu-  
facturer’s application for certification.  
(c) The ECS Warranty only pertains to emissions-related parts on your engine, as follows:  
(1) Any warranted, emissions-related parts that are not scheduled for replacement as required maintenance in the Owner’s  
Manual shall be warranted for the ECS Warranty Period. If any such part fails during the ECS Warranty Period, it shall  
be repaired or replaced by Generac according to Subsection (4) below. Any such part repaired or replaced under the ECS  
Warranty shall be warranted for the remainder of the ECS Warranty Period.  
(2) Any warranted, emissions-related part that is scheduled only for regular inspection as specified in the Owner’s Manual  
shall be warranted for the ECS Warranty Period. A statement in such written instructions to the effect of “repair or replace  
as necessary” shall not reduce the ECS Warranty Period. Any such part repaired or replaced under the ECS Warranty  
shall be warranted for the remainder of the ECS Warranty Period.  
(3) Any warranted, emissions-related part that is scheduled for replacement as required maintenance in the Owner’s  
Manual shall be warranted for the period of time prior to the first scheduled replacement point for that part. If the part  
fails prior to the first scheduled replacement, the part shall be repaired or replaced by Generac according to Subsection  
(4) below. Any such emissions-related part repaired or replaced under the ECS Warranty shall be warranted for the  
remainder of the ECS Warranty Period prior to the first scheduled replacement point for such emissions-related part.  
(4) Repair or replacement of any warranted, emissions-related part under this ECS Warranty shall be performed at no  
charge to the owner at a Generac Authorized Warranty Service Facility.  
(5) When the engine is inspected by a Generac Authorized Warranty Service Facility, the owner shall not be held responsi-  
ble for diagnostic costs if the repair is deemed warrantable.  
(6) Generac shall be liable for damages to other original engine components or approved modifications proximately caused  
by a failure under warranty of any emission-related part covered by the ECS Warranty.  
(7) Throughout the ECS Warranty Period, Generac shall maintain a supply of warranted emission-related parts sufficient  
to meet the expected demand for such emission-related parts.  
(8) Any Generac authorized and approved emission-related replacement part may be used in the performance of any ECS  
Warranty maintenance or repairs and will be provided without charge to the purchaser/owner. Such use shall not reduce  
Generac’s ECS Warranty obligations.  
(9) Unapproved, add-on, modified, counterfeit and/or ‘grey market’ parts may not be used to modify or repair a Generac  
engine. Such use voids this ECS Warranty and shall be sufficient grounds for disallowing an ECS Warranty claim.  
Generac shall not be held liable hereunder for failures of any warranted parts of a Generac engine caused by the use of  
such an unapproved, add-on, modified, counterfeit and/or ‘grey market’ part.  
EMISSION RELATED PARTS INCLUDE THE FOLLOWING:  
1) Fuel Metering System:  
2) Air Induction System including:  
a) Intake pipe/manifold  
b) Air cleaner  
3) Ignition System including:  
a) Spark plug  
b) Ignition module  
1.1) Gasoline carburetor assembly and its  
internal components (if so equipped).  
a) Fuel filter (if so equipped)  
b) Carburetor gaskets  
c) Fuel pump (if so equipped)  
1.2) LPG carburetion assembly and its  
internal components (if so equipped).  
a) Fuel controller (if so equipped)  
4) Catalytic Muffler Assembly (if so equipped) including:  
a) Muffler gasket  
b) Exhaust manifold  
b) Mixer and its gaskets (if so equipped)  
c) Carburetor and its gaskets (if so equipped)  
d) Primary gas regulator (if so equipped)  
e) LP liquid vaporizer (if so equipped)  
5) Crankcase Breather Assembly including:  
a) Breather connection tube  
*Generac engine types covered by this warranty statement include the following:  
1) Utility  
2) Lawn and Garden Equipment  
3) Recreational Vehicle (RV) Generator  
4) Industrial Mobile (IM) Generator  
Part 2  
®
Generac Power Systems, Inc. 57  
Download from Www.Somanuals.com. All Manuals Search And Download.  
Section 12 – Warranty  
PRIMEPACT 66G and 66LP Recreational Vehicle Generators  
GENERAC POWER SYSTEMS’ THREE-YEAR LIMITED WARRANTY  
FOR RECREATIONAL VEHICLE GENERATORS  
NOTE: ALL UNITS MUST BE INSTALLED BY GENERAC POWER SYSTEMS AUTHORIZED SERVICE FACILITIES.  
For a period of 3 (three) years or 2,000 (two thousand) hours of operation from the date of original sale, whichever occurs first, Generac  
Power Systems, Inc. (Generac) will, at its option, repair or replace any part which, upon examination, inspection and testing by Generac or  
a Generac Authorized Warranty Service Facility, is found to be defective under normal use and service, in accordance with the warranty  
schedule set forth below. Any equipment that the purchaser/owner claims to be defective must be returned to and examined by the nearest  
Generac Authorized Warranty Service Facility. All transportation costs under the warranty, including return to the factory, are to be borne  
and prepaid by the purchaser/owner. This warranty applies only to Generac generators sold and rated for “Recreational Vehicle” (RV) appli-  
cations, as Generac has defined Recreational Vehicle generator applications. This warranty is effective only upon Generac’s receipt, from  
the original purchaser/owner, of a completed Warranty Registration Card. This card is the only valid registration identification and must be  
presented at time of request for warranty service. Claims will not be accepted without presentation of the Warranty Registration Card. The  
factory recommends exercising the unit one half-hour every season.  
WARRANTY SCHEDULE – COMMERCIAL APPLICATIONS  
YEAR ONE – 100% (one hundred percent) coverage on part(s), labor, removal and reinstallation listed:  
• Engine – All components  
• Alternator – All components  
• Transfer System – All components  
WARRANTY SCHEDULE – CONSUMER/PERSONAL APPLICATIONS  
YEARS ONE AND TWO – 100% (one hundred percent) coverage on part(s), labor, removal and reinstallation listed:  
• Engine – All components  
• Alternator – All components  
• Transfer System – All components  
YEAR Three – 100% (one hundred percent) only on selected part(s) and labor listed (Any labor and part(s) not listed, and removal and rein-  
stallation are the owner’s responsibility):  
Rotor, Stator, Computer Control Board, (if applicable with regard to the generator) Cylinder Block, Cylinder Head, Crankshaft, Piston(s), Valve,  
Valve Lifter(s), Intake and Exhaust Manifolds  
FOR THE LIFE OF THE RECREATIONAL VEHICLE GENERATOR (IF SO EQUIPPED)  
The drive train belt and pulleys (if so equipped) on generators used in recreational vehicles shall be warranted against failure due to defec-  
tive materials or normal usage for the life of the generator. For the original purchaser/owner, this drive train warranty shall include part(s)  
and labor (removal and reinstallation are not included) plus $50 (fifty dollars – U.S.) payment upon return of the failed belt or pulley by  
the original purchaser/owner. For subsequent purchaser/owner, this drive train warranty shall cover belt and pulley part(s) ONLY (labor not  
included). Labor, removal and reinstallation is the responsibility of the subsequent purchaser/owner.  
Generac RV generators manufactured prior to December 31, 1997, DO NOT have a transferable warranty. Generac RV generators manu-  
factured after January 1, 1998, have a transferable warranty to the second owner ONLY for the remainder of the three-year limited war-  
ranty. Proof-of-purchase is required and must be presented to a Generac Authorized Warranty Service Facility prior to the performance of  
any warranty service.  
All warranty expense allowances are subject to the conditions defined in Generac’s SUPER SERVICE INFORMATION MANUAL.  
THIS WARRANTY SHALL NOT APPLY TO THE FOLLOWING:  
Costs of normal maintenance, adjustments, installation and start-up.  
Failures caused by any contaminated fuels or oils.  
Failures due, but not limited, to normal wear and tear, accident, misuse, abuse, negligence or improper installation. As with all  
mechanical devices, the GN-Series engines need periodic part(s) service and replacement to perform well. This warranty will not cover  
repair when normal use has exhausted the life of a part(s) or engine.  
Failures caused by any external cause or act of God, such as collision, theft, vandalism, riot or wars, nuclear holocaust, fire, freezing,  
lightning, earthquake, windstorm, hail, volcanic eruption, water or flood, tornado or hurricane.  
Products that are modified or altered in a manner not authorized by Generac in writing.  
Any incidental, consequential or indirect damages caused by defects in materials or workmanship, or any delay in repair or replace-  
ment of the defective part(s).  
Failure due to misapplication.  
Telephone, telegraph, teletype or other communication expenses.  
Living or travel expenses of person(s) performing service, except as specifically included within the terms of a specific unit warranty period.  
Rental equipment used while warranty repairs are being performed.  
Overnight freight costs for replacement part(s).  
Overtime labor.  
Starting batteries, fuses, light bulbs and engine fluids.  
THIS WARRANTY IS IN PLACE OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED. SPECIFICALLY, GENERAC MAKES NO OTHER  
WARRANTIES AS TO THE MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some states do not allow limitations on how  
long an implied warranty lasts, so the above limitation may not apply to you.  
GENERAC’S ONLY LIABILITY SHALL BE THE REPAIR OR REPLACEMENT OF PART(S) AS STATED ABOVE. IN NO EVENT SHALL GEN-  
ERAC BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES, EVEN IF SUCH DAMAGES ARE A DIRECT RESULT OF GEN-  
ERAC’S NEGLIGENCE. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limita-  
tion may not apply to you. Purchaser/owner agrees to make no claims against Generac based on negligence.  
This warranty gives you specific legal rights. You also may have other rights that vary from state to state.  
®
GENERAC POWER SYSTEMS, INC.  
P.O. BOX 8 • WAUKESHA, WI 53187  
Part No. 0D7803  
Revision 0 (11/14/01)  
Printed in U.S.A.  
Download from Www.Somanuals.com. All Manuals Search And Download.  

Euro Pro Vacuum Cleaner V1930 User Manual
Excalibur electronic Motorized Toy Car 9396 User Manual
Fellowes Paper Shredder 3229901 User Manual
Fisher Price Backyard Playset 75972 User Manual
Frigidaire Washer FFTW1001PW User Manual
Fusion Stereo Amplifier PP AM100010 User Manual
Gateway Laptop SYSMAN017AAUS User Manual
Gefen Switch EXT DVI 441DL User Manual
GE Microwave Oven 164 D2588P191 User Manual
GE Microwave Oven JES1334SD User Manual