Heavy Duty Power Equipment
4550 Pro, 5650, 6500(EL), 7550 Pro
DEK Product Lines
Heavy Duty Power Equipment
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For more information or where to purchase DEK outdoor power
Missing Parts Request Form
Please indicate the part that you are missing:
Hardware bag
Name
Wheel Kit
Other
Address
Date of purchase
Model #:
4550Pro
Phone
Email
5650
6500 or 6500EL
755EL Pro
Serial #:
Comments:
IMPORTANT: Please include your receipt. Without a receipt, your
order will be delayed. You may also email us at:
emailing, please scan in your proof of purchase.
Rev. 1/2010
DEK® is registered trademark of GXi Outdoor Power, LLC Clayton, NC 27520 USA.
No part of this publication can be printed or copied without written permission.
3 of 16
Heavy Duty Power Equipment
4550 Pro, 5650, 6500(EL), 7550 Pro
WARNINGS
WARNING
The engine exhaust from this product contains chemicals
known to the State of California to cause cancer, birth de-
fects or other reproductive harm.
DANGER
Fire and Burn Hazards
The exhaust system gets hot enough to ignite some materials.
Keep the generator at least 3 feet (1 meter) away from
buildings and other equipment during operation.
Do not enclose the generator in any structure.
Do not smoke when refueling.
Keep flammable materials away from the generator.
The muffler becomes very hot during operation and remains
hot for a while after stopping the engine. Be careful not to
touch the muffler while it is hot.
Let the engine cool before storing the generator indoors.
Refuel in a well ventilated area with the engine stopped.
Fuel vapors are extremely flammable and may ignite after
the engine has started. Make sure that any spilled fuel has
been wiped up before starting the generator.
Connections to a Building Electrical System
Connections for standby power to a building electrical system
must be made by a qualified electrician. The connection must
isolate the generator power from utility power, and must comply
with all applicable laws and electrical codes. A transfer switch,
which isolates generator power from utility power, is available
through any of GXi’s authorized dealers of DEK generators.
WARNING
Generator must be installed by a qualified electrician and
connected to transfer equipment as a separately derived sys-
tem in accordance with the National Electrical Code, NFPA
70. The generator shall be connected through transfer equip-
ment that switches all conductors other than the equipment
grounding conductor. The frame of the generator shall be
connected to an approved grounding electrode.
DANGER
CARBON MONOXIDE GAS
Exhaust contains poisonous carbon monoxide, a colorless
and odorless gas. Breathing exhaust can cause loss of con-
sciousness and may lead to death. To keep exhaust gas
from accumulating, use in an area with adequate ventila-
tion. DO NOT use this generator in a garage, basement,
crawlspace, enclosed shed, or any other area that does not
have adequate ventilation. DO NOT use this generator near
ventilation ducts or open windows that may allow exhaust
gasses to enter your home or business. ONLY operate this
generator outdoors.
Improper connections to a building electrical system can
allow electrical current from the generator to backfeed into
the utility lines. Such backfeed may electrocute utility com-
pany workers or others who contact the lines during a power
outage, and the generator may explode, burn, or cause fires
when utility power is restored.
Ground System
DEK portable generators have a system ground that connects
generator frame components to the ground terminals in the AC
output receptacles. The system ground is not connected to the
AC neutral wire. If the generator is tested by a receptacle tester, it
will not show the same ground circuit condition as for a home
receptacle where the ground and neutral are connected.
DANGER
Electrocution Hazard
Keep the generator dry.
DO NOT use the generator in wet conditions, rain or
snow, or near a pool or sprinkler system
Special Requirements
DO NOT use when your hands are wet
There may be Federal or State Occupational Safety and Health
Administration (OSHA) regulations, local codes, or ordinances
that apply to the intended use of the generator. Please consult a
qualified electrician, electrical inspector, or the local agency hav-
ing jurisdiction.
NEVER START OR STOP THE ENGINE WITH DEVICES CON-
NECTED TO THE GENERATOR.
Rev. 1/2010
DEK® is registered trademark of GXi Outdoor Power, LLC Clayton, NC 27520 USA.
No part of this publication can be printed or copied without written permission.
4 of 16
Heavy Duty Power Equipment
4550 Pro, 5650, 6500(EL), 7550 Pro
WARNINGS
AC Applications
WARNING
Before connecting an appliance or power cord to the generator:
1. Make sure that appliances are in good working order.
Faulty appliances or power cords can create a potential for
electrical shock. If an appliance begins to operate abnor-
mally, becomes sluggish or stops suddenly, turn it off imme-
diately.
Failure to properly follow maintenance instructions and
precautions can cause serious injuries or death. Always
follow the inspection and maintenance recommendations
and schedules in this owner’s manual.
2. Disconnect the appliance, and determine whether the prob-
lem is the appliance, or if the rated load capacity of the gen-
erator has been exceeded.
3. Make sure that the electrical rating of the tool or appliance
does not exceed that of the generator. Never exceed the
maximum power rating of the generator. Power levels be-
tween rated and maximum may be used for no more than
30 minutes.
Safety Precautions:
Make sure the engine is off before you begin any maintenance
or repairs. This will eliminate several potential hazards:
Carbon monoxide poisoning from engine exhaust.
Be sure there is adequate ventilation whenever you
operate the engine.
Burns from hot parts.
Let the engine and exhaust system cool before touch-
ing.
Substantial overloading will open the circuit breaker. Ex-
ceeding the time limit for maximum power operation or
slightly overloading the generator may not switch the
circuit breaker or circuit protector OFF, but will shorten the
service life of the generator.
Injury from moving parts.
Do not run the engine unless instructed to do so.
In the State of California a spark arrestor is required by law.
Other states may have similar laws. Federal laws apply on all
federal lands. If you equip the muffler with a spark arrestor, it
must be maintained in effective working order. See page 11.
Limit operation requiring maximum power to 30 minutes. For
continuous operation (longer than 30 minutes), do not exceed
80% of the rated power balanced equally on the A&B sides of
the Alternator.
Rapid retraction of the recoil starter cord can pull the
starter cord back faster than you can let go. When starting
the engine, pull the cord slowly until resistance is felt then
pull rapidly to avoid kickback.
The total power requirements (VA) of all appliances connected
must be considered. Appliance and power tool manufacturers
usually list rating information near the model number or serial
number.
Changing the speed of the generator by adjusting the governor can cause damage to the gen-
erator, devices attached to the generator, and may result in bodily injury. Do not adjust or
tamper with the engine speed setting.
DANGER
Product Specifications
Rev. 1/2010
DEK® is registered trademark of GXi Outdoor Power, LLC Clayton, NC 27520 USA.
No part of this publication can be printed or copied without written permission.
5 of 16
Heavy Duty Power Equipment
4550 Pro, 5650, 6500(EL), 7550 Pro
Component Identification
Fuel Cap
Fuel Tank
Generator models may have
different features and/or options
than shown in these diagrams.
DEK reserves the right to alter
product features and
specifications.
Choke Lever
Battery (electric start option only)
Air Filter
Fuel Valve
Oil Fill Cap—one one each side of the
engine.
Recoil Starter (Assembly)
Emissions Information
Oil Drain (one on each side of the engine)
Engine Serial Number stamped
on the engine block
Main
Breaker
ON/OFF Switch
L14-30 240V/120V
Digital Meter
Ground
Lug
12 V Breaker
120V AC Outlets
Start Switch (electric start option)
12V DC Outlet
Pull Out Handle
Bars
Choke Lever
(recessed)
Valve Cover
Carburetor
Alternator
Muffler Guard
Exhaust Pipe
Rev. 1/2010
DEK® is registered trademark of GXi Outdoor Power, LLC Clayton, NC 27520 USA.
No part of this publication can be printed or copied without written permission.
6 of 16
Heavy Duty Power Equipment
4550 Pro, 5650, 6500(EL), 7550 Pro
Wheel Kit Assembly
Required Tools (not supplied)
1. Adjustable wrench or a socket
wrench with a 8 mm socket.
Pre-assembled wheel /
axle assembly.
Approximate assembly time is 5
minutes.
Supplied with your generator:
1. Two(2) foot assemblies with two
(2) 8 mm nuts.
2. Two (2) wheel axle assemblies.
Two pre-assembled, retractable, handle bars, one
on each side of the generator frame. Twist to
lock / unlock. Pull or push to extend / retract.
Step
1
Insert each foot assembly through
holes in the frame. Tighten nut with
adjustable wrench or 8 mm socket.
Insert each axle and tighten the
bolt to secure in place using an
adjustable wrench or 8 mm
socket.
Step
2
Additional equipment required to safely operate this generator:
1. Gas can.
2. Unleaded gasoline.
3. SAE 10W30 & 14HP oil (a little more than 1 quart for DEK 11hp, 13hp and 14hp engines, a little less than 1 quart is required for DEK’s
smaller engines).
4. An oil fill funnel.
5. Gasoline fuel stabilizer (for storing your generator). 120V and/or 240V extension cords.
6. An adjustable wrench or a 12mm socket for oil changes.
Note: A spark arrestor was supplied with your generator and must be installed for use within the State of California. See supplemental instructions.
Commissioning the Battery
The battery is an optional feature. The battery is used to
start a generator equipped with an electric starter. Not all
generators are sold with batteries. Please verify with your
retailer if you believe the battery is missing.
Battery Maintenance:
Routine maintenance is essential to keep the battery in good
condition and maximize its service life.
1. Keep the terminals and connections free from corrosion
and coat with petroleum jelly or grease to reduce corrosion
from occurring.
2. If the generator sits idle for more than two (2) months, it is
best to recharge the battery to ensure it is fully charged
when you need it and to increase battery life.
WARNING
Lead acid storage batteries contain sulfuric acid which can
cause serious injuries. The battery also gives off explosive
gases. Keep sparks, flames and cigarettes away. Provide
adequate ventilation when charging or using batteries. Bat-
tery posts, terminals and related accessories contain lead
and lead compounds. Avoid spills of electrolyte and wash
hands thoroughly after handling.
FOR YOUR SAFETY AND CONVENIENCE, THE
BATTERY WAS SHIPPED SEALED AND
PRE-CHARGED.
The battery is ready to be connected to the generator.
Use gloves and safety glasses when handling and installing
lead acid batteries.
To connect the battery, use an adjustable wrench or 8 mm
socket to secure the black wire to the positive terminal and
the negative terminal.
If you get electrolyte in your eyes, flush your eyes with clean
water for 15 minutes and seek medical attention. Keep out of
reach of children.
Rev. 1/2010
DEK® is registered trademark of GXi Outdoor Power, LLC Clayton, NC 27520 USA.
No part of this publication can be printed or copied without written permission.
7 of 16
Heavy Duty Power Equipment
4550 Pro, 5650, 6500(EL), 7550 Pro
Controls
DC Terminals
Disconnecting the battery cables:
1. Stop the engine.
Some generators are shipped with optional DC battery charging
cables, have a standard 12V DC receptacle, and have a 12V
cigarette lighter style outlet.
2. Disconnect the negative ( - ) battery cable from the genera-
tor negative ( - ) terminal.
3. Disconnect the other end of the negative ( - ) battery cable
from the battery negative ( - ) terminal.
The battery must be connected to the generator DC terminals
with the proper polarity (battery positive to generator red termi-
nal and battery negative to the generator black terminal).
4. Disconnect the positive ( + ) battery cable from the genera-
tor positive (+ ) terminal.
5. Disconnect the other end of the positive ( + ) battery cable
from the battery positive ( + ) terminal.
6. Reconnect the vehicle ground battery cable to the battery
negative ( - )terminal.
WARNING
Do not use the 12V DC and the AC receptacles at the same
time.
Connecting the battery cables:
1. Before connecting the battery charging cables to a battery
that is installed in a vehicle, disconnect the vehicle ground
battery cable from the battery negative ( - ) terminal.
2. Connect the other end of the positive ( + ) battery cable to
the generator positive ( + ) terminal.
3. Connect the positive ( + ) battery cable to the battery posi-
tive ( + ) terminal.
4. Connect the negative ( - ) battery cable to the battery nega-
tive ( - ) terminal.
5. Connect the other end of the negative ( - ) battery cable to
the generator negative ( - ) terminal.
6. Start the generator.
CAUTION: Do not start the vehicle while the battery charg-
ing cable is connected and the generator is running. The
vehicle or the generator may be damaged.
Rev. 1/2010
DEK® is registered trademark of GXi Outdoor Power, LLC Clayton, NC 27520 USA.
No part of this publication can be printed or copied without written permission.
8 of 16
Heavy Duty Power Equipment
4550 Pro, 5650, 6500(EL), 7550 Pro
Controls
WARNING
Recoil Starter
The engine was shipped without engine oil. DO NOT START
THE ENGINE WITHOUT FILLING THE ENGINE WITH OIL.
Use SAE 10W-30 for normal conditions and SAE 5W-30
when the ambient temperature is below 32° F.
To start the engine, pull the starter grip lightly until resistance is
felt, then pull briskly.
NOTICE:
Do not allow the starter grip to snap back against the engine.
Return it gently to prevent damage to the starter.
Choke Rod
The recoil starter is used to start the engine if the generator is
not equipped with a 12 volt battery to operate the starter motor,
or if the battery does not contain adequate charge to operate the
starter motor.
The choke is used to
provide an enriched
fuel mixture when
starting a cold en-
gine. It can be
opened and closed
by operating the
choke rod manually.
Pull the rod out to-
ward CLOSED to
enrich the mixture
for cold starting.
Open once the en-
gine is running.
STARTER GRIP
RECOIL STARTER
Turn clock-
wise to turn
fuel valve on.
Fuel Valve Lever
Oil Alert System
The fuel valve is
The Oil Alert system is designed to prevent engine damage
caused by an insufficient amount of oil in the crankcase. Before
the oil level in the crankcase can fall below a safe limit, the Oil
Alert system will automatically stop the engine (the engine
switch will remain in the ON position). The Oil Alert system
should not take the place of checking the oil level before each
use. If the engine stops and will not restart, check the engine oil
level (see page 14) before troubleshooting in other areas.
located between the
fuel tank and carbu-
retor. When the
valve lever is in the
ON position, fuel is
allowed to flow from
the fuel tank to the
carburetor. Be sure
to return the fuel
valve lever to the
OFF position after
stopping the engine.
Ground Terminal
The generator ground terminal is con-
nected to the frame of the generator, the
metal non-current-carrying parts of the
generator, and the ground terminals of
each receptacle.
Engine Switch
To start and stop the engine.
WARNING
Before using the ground terminal, consult a qualified elec-
trician, electrical inspector or local agency having jurisdic-
tion for local codes or ordinances that apply to the intended
use of the generator.
NOTE: SYSTEM GROUND IS NOT CONNECTED TO THE AC
NEUTRAL ON THIS GENERATOR. CONSULT AN ELECTRI-
CIAN WHEN CONNECTING THIS GENERATOR TO YOUR
HOME OR BUSINESS ELECTRICAL PANEL TO ENSURE
GROUNDING MEETS THE LOCAL ELECTRICAL CODE
Electric Starter Switch
(optional feature)
Engine ON / OFF Switch
Rev. 1/2010
DEK® is registered trademark of GXi Outdoor Power, LLC Clayton, NC 27520 USA.
No part of this publication can be printed or copied without written permission.
9 of 16
Heavy Duty Power Equipment
4550 Pro, 5650, 6500(EL), 7550 Pro
Operating the Generator
DANGER
CARBON MONOXIDE GAS
CARBON MONOXIDE Using a generator indoors CAN KILL
YOU IN MINUTES.
Step 3.
Generator exhaust contains carbon monoxide (CO). This is
a poison you cannot see or smell. If you can smell the gen-
erator exhaust, you are breathing CO. But even if you can-
not smell the exhaust, you could be breathing CO.
Make sure there is fuel in the gasoline
tank. Look at the fuel level indicated
by removing the fuel cap to inspect
the contents of the fuel tank. The fuel
filter can also be inspected once the
fuel cap is removed. Ensure the fuel filter is clean of dirt and
debris. Tightly secure the fuel cap after your inspection is com-
plete.
NEVER use a generator inside homes, garages, crawl-
spaces, or other partly enclosed areas. Deadly levels of
carbon monoxide can build up in these areas. Using a fan
or opening windows and doors does NOT supply enough
fresh air.
Fuel can damage paint and plastic. Be careful not to spill fuel
when filling your fuel tank. Damage caused by spilling fuel is not
covered under warranty. Use unleaded gasoline with a pump
octane rating of 86 or higher. This engine is certified to operate
on unleaded gasoline. Unleaded gasoline produces fewer en-
gine and spark plug deposits and
ONLY use a generator outside and far away from windows,
doors, and vents. These openings can pull in generator
exhaust.
Even when you use a generator correctly, CO may leak into
the home. ALWAYS use a battery-powered or battery-
backup CO alarm in the home.
extends exhaust system life. Never
use stale or contaminated gasoline
or an oil/gasoline mixture. Avoid
getting dirt or water in the fuel tank.
If you start to feel sick, dizzy, or weak after the generator
has been running, move to fresh air RIGHT AWAY. See a
doctor. You could have carbon monoxide poison.”
WARNING
For power outages, permanently installed stationary generators
are better suited for providing backup power to the home. Even a
properly connected portable generator can become overloaded.
This may result in overheating or stressing the generator compo-
nents, possibly leading to a generator failure.
WARNING
Ethanol warning
Step 1.
Ensure all electrical loads are removed from the generator.
Disconnect all the extension cords and ensure the main breaker
is in the OFF position. Remove all flammable materials and
debris from the area. Make sure the generator is level.
This portable generator is not for use with
gasoline/ethanol blends with over 15%
ethanol.
Step 2.
Check the oil level by removing the oil fill cap.
DO NOT overfill the tank. Leave a 1 inch air gap in the tank.
Gasoline is highly flammable and explosive. You can be
burned or seriously injured when refueling.
Put the generator on a level surface with the engine
stopped.
Remove the oil filler cap.
Stop engine and keep heat, sparks, and flame away.
Refuel only outdoors.
Check the oil level. If the oil level is low, fill it until the oil is
overflowing. It will take approximately 1.1 - 1.5 quarts of
oil.
If additional oil is need, SAE 10W-30 engine oil is recommended
for most general purpose applications. In cold weather climate,
use SAE 5W-30.
Wipe up spills immediately.
Rev. 1/2010
DEK® is registered trademark of GXi Outdoor Power, LLC Clayton, NC 27520 USA.
No part of this publication can be printed or copied without written permission.
10 of 16
Heavy Duty Power Equipment
4550 Pro, 5650, 6500(EL), 7550 Pro
Operating the Generator
Continuously loading this generator above 80% of its maxi-
mum output power will shorten the life of the generator.
Step 4.
Set the fuel valve lever to the ON position by rotating it clock-
wise.
Balance the load evenly between the A and B outlets to maxi-
mize the output power.
Step 5.
Pull the choke lever to the CLOSED position. See page 7 for a
diagram of the choke lever.
Appliances with electric motors require an additional 150%
power when they are starting up (indicated by an * and in bold
in the chart below).
Step 6.
Turn the generator ON/OFF switch to the “ON” position.
To determine maximum load that you may safely connect
to this generator:
Step 7.
Start the engine
1. Calculate the maximum continuous power required by add-
ing up the running power of each appliance. The total run-
ning power of your appliances cannot exceed the maximum
output power of this generator.
1. If you have an electric starter, press the electric starter
switch to the START position, hold it there for 5 seconds and
let it come to rest in the ON position once the engine has
started.
2. If you are using the recoil starter, pull slightly on the cord
until you feel some pressure. Once you feel the back-
pressure building, rapidly pull the cord.
2. Calculate the surge power by:
i) Adding up the running power of each appliance with an
* and in bold below.
ii) Multiplying the total by 1.5.
iii) Adding this to the total running power calculated in
step 1 above.
Step 8.
Once the generator is running, push the choke lever into the
OPEN position.
The surge power requirements of your appliances cannot
exceed the surge power rating of this generator.
Step 9.
Let the generator warm up for approximately 3 minutes before
applying any electrical loads.
Typical Residential Loads
Appliance
Running Power
Step 10.
Light bulbs (each)
Stove element (each)
Microwave
Coffee maker
Television
75 Watts
Apply loads to the generator one at a time, allowing the genera-
tor to stabilize after you add each incremental load. Add the
loads with the largest surge power requirement first. This would
include refrigerators, air-conditioners, large motors, and pumps.
Add smaller loads once the generator has stabilized with the
larger loads.
1000 Watts
1500 Watts
700 Watts
750 Watts
250 Watts
800 Watts
1500 Watts
1000 Watts
750 Watts
5500 Watts
1850 Watts
5000 Watts
5000 Watts
1200 Watts
750 Watts
2400 Watts
2800 Watts
850 Watts
2000 Watts
1000 Watts
1000 Watts
VCR
Computer & monitor
Space heater
Washing machine
NG clothes dryer
Electric clothes dryer
Dishwasher
Water heater
Electric furnace
Toaster
ALWAYS UNPLUG APPLIANCES AND REMOVE ALL ELEC-
TRICAL LOADS BEFORE REFUELING. THEN FOLLOW
STEPS 2 - 10.
Box fan*
Window A/C - 8000 BTU*
Central A/C (per ton)*
Furnace blower*
2 hp well pump*
Refrigerator*
Freezer*
WARNING
STOPPING THE GENERATOR
In an emergency:
Connecting a load larger than this generator’s power rating may
damage the circuit breakers, alternator and sensitive appliances.
To stop the engine in an emergency, move the engine switch
to the OFF position and turn the fuel valve OFF.
In normal use:
1. Turn the AC circuit breaker to the OFF position (if applicable).
2. Disconnect all loads and extension cords.
3. Allow the engine to run with no load for 3 minutes.
4. Turn the engine switch to the OFF position.
5. Turn the fuel valve lever to the OFF position.
6. Allow the generator to cool off before touching any engine or
alternator components. It may take as long as 30 minutes
before the generator is cool enough to touch safely.
Rev. 1/2010
DEK® is registered trademark of GXi Outdoor Power, LLC Clayton, NC 27520 USA.
No part of this publication can be printed or copied without written permission.
11 of 16
Heavy Duty Power Equipment
4550 Pro, 5650, 6500(EL), 7550 Pro
Maintenance
MAINTENANCE
Engine Oil Change
Drain the oil while the engine is warm to assure rapid and com-
plete draining.
The Importance of Maintenance
Good maintenance is essential for safe, economical, and trou-
ble-free operation. It will also help reduce air pollution.
1. Remove the drain plug and sealing washer, remove the oil
filler cap, and drain the oil.
To help you properly care for your generator, the following
pages include a maintenance schedule, routine inspection
procedures, and simple maintenance procedures using basic
hand tools. Other service tasks that are more difficult, or re-
quire special tools, are best handled by professionals and are
normally performed by a DEK technician or other qualified
mechanic.
2. Reinstall the drain plug and sealing washer. Tighten the
plug securely.
3. Refill with the recommended oil (SAE 10W-30 ) and check
the oil level.
Dispose of used motor oil in a manner that is compatible with
the environment. Do not throw it in the trash, pour it on the
ground, or down a drain.
The maintenance schedule applies to normal operating condi-
tions. If you operate your generator under severe conditions,
such as sustained high-load or high-temperature operation, or
use it in unusually wet or dusty conditions, consult your servic-
ing dealer for recommendations applicable to your individual
needs and use.
Air Cleaner Service
A dirty air cleaner will restrict air flow to the carburetor. To pre-
vent carburetor malfunction, service the air cleaner regularly.
Service more frequently when operating the generator in ex-
tremely dusty areas.
Maintenance, replacement, or repair of the emission con-
trol devices and systems may be performed by any engine
repair establishment or individual, using parts that are
‘‘certified’’ to EPA standards.
NOTICE:
Never run the generator without the air filter. Rapid engine wear
will result.
1. Unsnap the air cleaner cover clips, remove the air
cleaner cover, and remove the element.
2. Wash the air cleaner element in a solution of household
detergent and warm water, then rinse thoroughly, or
wash in nonflammable or high flashpoint solvent. Allow
the air cleaner element to dry thoroughly.
Maintenance Schedule
Item
Before
each use
20hrs or
every 3
month
50 hrs or
every 3
months
100 hrs or
every 6
months
300 hrs
or every
1 year
3. Soak the air cleaner element in clean engine oil and
squeeze out the excess oil. The engine will smoke dur-
ing initial startup if too much oil is left in the air cleaner
element.
Engine oil (Check)
X
X
Engine Oil (Change)
X
4. Reinstall the air cleaner element and the cover.
Air Cleaner (Check)
Fuel Filter Cleaning
Air Cleaner Wash
X
X
Fuel filter Cup (Clean)
Spark Plug (Clean)
X
X
The fuel filter cup / screen prevents dirt which may be in the
fuel from entering the carburetor. The fuel filter should be
inspected and cleaned on a regular basis. For best results,
clean the filter with gasoline and a toothbrush or blow the
debris out of the filter with air pressure.
Spark Plug (Change)
Optional Spark Arrestor (Clean)
Valve Clearance (Adjust)
Fuel Tank and Filter (Clean)
Fuel Tube (Check)
X
X*
Spark Plug Service
X*
Every 2 yrs (replace if necessary)*
After every 250 hrs*
In order to service the spark plug, you will need a spark plug
wrench. Recommended spark plugs: BPR5ES (NGK) and
W16EPR-U (DENSO). To ensure proper engine operation,
the spark plug must be properly gapped and free of depos-
its.
Combustion Chamber (Clean)
* Should be performed by an authorized DEK dealer.
Replacement Parts
If the engine has been running, the muffler will be very
hot. Be careful not to touch the muffler.
The emission control systems on your DEK engine were designed,
built, and certified to conform with EPA and California emission regu-
lations. We recommend the use of genuine DEK parts whenever you
have maintenance done. These original-design replacement parts
are manufactured to the same standards as the original parts, so you
can be confident of their performance. The use of replacement parts
that are not of the original design and quality may impair the effec-
tiveness of your emission control system.
1. Remove the spark plug cap.
2. Clean any dirt from around the spark plug base.
3. Use a spark plug wrench to remove the spark plug.
A manufacturer of an aftermarket part assumes the responsibility that
the part will not adversely affect emission performance. The manu-
facturer or rebuilder of the part must certify that use of the part will
not result in a failure of the engine to comply with emission regula-
tions.
Rev. 1/2010
DEK® is registered trademark of GXi Outdoor Power, LLC Clayton, NC 27520 USA.
No part of this publication can be printed or copied without written permission.
12 of 16
Heavy Duty Power Equipment
4550 Pro, 5650, 6500(EL), 7550 Pro
Maintenance
TRANSPORTING
When transporting the generator, turn the engine switch and the
fuel valve OFF. Keep the generator level to prevent fuel spillage.
Fuel vapor or spilled fuel may ignite.
4. Visually inspect the spark plug. Dis-
card it if the insulator is cracked,
chipped or fouled.
5. Measure the plug gap with a feeler
gauge. Correct as necessary by
carefully bending the side electrode.
The gap should be: 0.028 0.031 in
(0.70 0.80 mm)
Take care not to drop or strike the generator when transporting.
Do not place heavy objects on the generator. When transporting
the generator by loading it on to a vehicle, secure to the genera-
tor frame as shown.
6. Check that the spark plug washer is in good condition, and
thread the spark plug in by hand to prevent cross-threading.
7. After the spark plug is seated, tighten with a spark plug
wrench to compress the washer.
DANGER
Contact with a hot engine
or exhaust system can
cause serious burns or
fires. Let the engine cool
before transporting or stor-
ing the generator.
If installing a new spark plug, tighten 1/2 turn after the spark
plug seats to compress the washer. If reinstalling a used spark
plug, tighten 1/8 1/4 turn after the spark plug seats to compress
the washer.
STORING
NOTICE:
Before storing the unit for an extended period:
1. Be sure the storage area is free of excessive humidity and dust.
2. Service according to the table below:
The spark plug must be securely tightened. An improperly tight-
ened spark plug can become very hot and could damage the
engine. Use only the recommended spark plugs or equivalent.
Optional Spark Arrestor Maintenance
STORAGE TIME
1 to 2 months
Recommended Service Procedure to prevent hard starting:
Fill with fresh gasoline and add gasoline conditioner*.
Fill with fresh gasoline and add gasoline conditioner*.
If the generator has been running, the muffler will be very hot.
Allow it to cool before proceeding. The spark arrester must be
serviced every 50 hours to keep it functioning as designed.
2 months to 1 year
Clean the spark arrester as follows:
1. Loosen the screw by the exhaust port of the muffler and
remove the spark arrester.
2. Use a brush to remove carbon deposits from the spark ar-
rester screen. Inspect the screen for breaks or tears and
replace it if necessary.
Fill with fresh gasoline and add gasoline conditioner*.
Drain the carburetor float bowl.
1 year or longer
Remove the spark plug. Put a tablespoon of engine oil into the cylinder.
Turn the engine slowly with the recoil starter to distribute the oil. Reinstall
the spark plug.
3. Install the spark arrester in the reverse order of removal.
Change the engine oil.
SCREW
After removal from storage, drain the stored gasoline into a suitable con-
* Use gasoline conditioners that are formulated to extend storage life. Contact your authorized
DEK generator dealer for conditioner recommendations.
Storage Preparation
1. Drain the carburetor by loosening the drain screw. Drain the
gasoline into a suitable container. Place 4 ounces of fuel
stabilizer in the fuel tank.
SPARK ARRESTOR
2. Change the engine oil (page 10 ).
Optional Starter Motor Fuse Replacement
3. Remove the spark plug, and pour about a tablespoon of
clean engine oil into the cylinder. Turn the engine several
revolutions slowly with the recoil starter to distribute the oil,
then reinstall the spark plug.
If the fuse is blown, the starter motor won’t operate. Turn the en-
gine switch to the OFF position. Remove the fuse holder cover
and replace the fuse. The specified fuse is 10A.
4. Slowly pull the starter grip until resistance is felt. At this
point, the piston is coming up on its compression stroke and
both the intake and exhaust valves are closed. Storing the
engine in this position will help to protect it from internal
corrosion.
NOTICE:
Never use a fuse with a
different rating from that
specified. Serious dam-
age to the electrical sys-
tem or fire may result.
WARNING
Gasoline is extremely flammable and is explosive under
certain conditions. Perform this task in a well-ventilated
area with the engine stopped. Do not smoke or allow flames
or sparks in the area during this procedure.
Rev. 1/2010
DEK® is registered trademark of GXi Outdoor Power, LLC Clayton, NC 27520 USA.
No part of this publication can be printed or copied without written permission.
13 of 16
Heavy Duty Power Equipment
4550 Pro, 5650, 6500(EL), 7550 Pro
Troubleshooting
Symptom:
No spark, engine not catching, engine won't start
Potential Causes
Fuel valve off/out of fuel
Spark arrestor clogged
Choke is open
Vacuum check valve has failed
On/Off switch broken
Oil level too low
Check / solution
Fill tank/turn fuel valve on
Remove, clean and replace.
Close choke by pulling choke wire out. Open choke after starting
Replace check valve
Recommendation
Call DEK for parts/service
Call DEK for parts/service
Use fuel shut-off as ON/OFF switch until switch is replaced.
The engine shuts down when oil level low
Oil switch
Verify oil switch/sensor is functioning . The oil switch is the gold, brass colored box about 3 inches to the
left of the oil fill cap. Dis-connect oil switch by disconnecting black lead out of finger connection. If the
engine starts, then switch/sensor is faulty or the oil level is too low, if engine still does not start, then
switch/sensor is probably ok to reassemble
Call DEK for parts/service
Recoil is broken
If ratchets are broken they will not spin the engine.
Call DEK for parts/service
Fuel filter is dirty
Contaminates will clog filter, not allowing fuel to get to engine. Clean or replace fuel filter.
Contaminates in fuel will not allow combustion at the specified pressure and temperate and blocks filters
Press spark plug boot firmly on spark plug.
Fuel is contaminated
Spark plug boot off/loose
Ignition coil failure
Call DEK for parts/service
Call DEK for parts/service
Call DEK for parts/service
Call DEK for parts/service
Spark plug fouled or failed
Carburator clogged
Remove spark plug, clean or replace
Clean with fresh fuel
Symptom:
Potential Causes
Recoil is hard to pull or not retracting
Check / solution
Recommendation
Spark arrestor
Remove, clean and replace.
Recoil rubbing on dented housing
Alternator bearing failed
Camshaft detent has failed
Head valve timing is off
Call DEK for parts/service
Call DEK for parts/service
Call DEK for parts/service
Call DEK for parts/service
Alternator bearing needs to be replaced. Send to service.
Symptom:
Potential Causes
Engine starts, but then shuts off before 10 seconds
Check / solution
Recommendation
Remove/Clean spark arrestor
Oil level too low
Fuel valve off/out of fuel
Spark plug fouled or failed
Remove, clean and replace.
The engine shuts down when the oil level is low. Check the owners manual for oil capacity
Fill tank/turn fuel valve on
Remove spark plug, clean or replace
Call DEK for parts/service
Call DEK for parts/service
Vacuum check valve has failed Replace check valve, call DEK for replacement procedure.
Symptom:
Choke wire broke
Potential Causes
Choke broke
Check / solution
Recommendation
Call DEK for parts/service
Choke should be closed while starting. Pull black choke counter-clockwise and hold in place with wire.
Release after starting.
Symptom:
Engine runs: rough/vibrating/oscillating
Potential Causes
Check / solution
Recommendation
Remove/Clean spark arrestor
The choke is not open
Over loading generator
Air filter is dirty
Remove, clean and replace.
Push choke lever in.
Disconnect some appliances
Clean air filter
Fuel filter is clogged
Fuel is contaminated
Vacuum check valve has failed
Head valve timing is off
Contaminates will clog filter, not allowing fuel to get to engine. Clean filter
Contaminates in fuel will not allow combustion at the specified pressure and temperate
Replace check valve.
Call DEK for parts/service
Call DEK for parts/service
Send to service
Symptom:
Engine runs, but boggs down under load
Check / solution
Remove, clean and replace.
Potential Causes
Remove/Clean spark arrestor
Choke is open
Recommendation
Push choke lever in
Over loading generator
Air filter is dirty
Disconnect some appliances / devices
Clean air filter
Fuel filter is clogged
Contaminates will clog filter, not allowing fuel to get to engine
Symptom:
Engine runs, Volt meter shows 120 VAC, but no power to outlets
Check / solution
Try different / shorter extension cord or a different power strip
Disconnect all loads and push reset button.
Disconnect all loads. Push the red reset button very deep/firmly
Replace GFCI with any GFCI or household outlet
Potential Causes
Bad extension cord/power strip
Push button breaker tripped
GFCI tripped
Recommendation
GFCI failed
Call DEK for parts/service
Rev. 1/2010
DEK® is registered trademark of GXi Outdoor Power, LLC Clayton, NC 27520 USA.
No part of this publication can be printed or copied without written permission.
14 of 16
Heavy Duty Power Equipment
4550 Pro, 5650, 6500(EL), 7550 Pro
Troubleshooting
Symptom:
Engine runs and volt meter shows 240VAC and 120VAC, but no power goes to connected devices
Check / solution
Try different / shorter extension cord or a different power strip
Try a different light bulb or device
Potential Causes
Bad extension cord/power strip
Device failed
Recommendation
Push button breaker tripped
GFCI tripped
Push button breaker tripped
Push the red reset button very deep/firmly
GFCI failed
Broken wire
Toggle switch failed
Replace GFCI with any GFCI or household outlet
Call DEK for parts/service
Call DEK for parts/service
Call DEK for parts/service
Symptom:
Engine runs, volt meter shows 120VAC in 120V mode, but 120VAC or 0VAC in 240V mode
Check / solution
Potential Causes
Circuit breaker failed
Toggle switch failed
Alternator phase has failed
Broken wire
Recommendation
Call DEK for parts/service
Call DEK for parts/service
Call DEK for parts/service
Call DEK for parts/service
Symptom:
Potential Causes
Spark arrestor
Voltage too high/low
Check / solution
Remove, clean and replace.
Recommendation
Voltage not measured correctly Voltage must be measured between hot and neutral, not hot and ground, the ground is isolated
Speed screw bent
Call DEK for parts/service
Symptom:
Potential Causes
Alternator phase has failed
Voltage is 120 VAC on 1 phase but too high/low on other phase
Check / solution
Recommendation
Call DEK for parts/service
Symptom:
Potential Causes
Engine oil leaking
Check / solution
Recommendation
Oil leaking from crankcase gas- Tighten crankcase bolts
ket
Oil leaking from shaft
Oil seals failed
Call DEK for parts/service
Symptom:
Potential Causes
Bolt not tight
Oil leaking from Valve head cover
Check / solution
Tighten bolts
Recommendation
Symptom:
Fuel leak at tank shut-off
Potential Causes
Shut-off valve loose
Check / solution
Tighten nut on shut-off valve/replace shut-off valve
Recommendation
Call DEK for parts/service
Symptom:
Potential Causes
Fuel drain screw loose
Fuel leaking out of carburator
Check / solution
Tighten fuel drain screw
Recommendation
Carburator float seat not seating Flush with clean fuel
Symptom:
Cannot turn engine with recoil
Potential Causes
Check / solution
Recommendation
Recoil ratchets have broken
Recoil is crushed in
Alternator bearing has failed
Head valve timing is off
Call DEK for parts/service
Call DEK for parts/service
Call DEK for parts/service
Call DEK for parts/service
Symptom:
Potential Causes
Replace fuel gauge gasket
Fuel gauge leaks
Check / solution
Recommendation
Call DEK for parts/service
Rev. 1/2010
DEK® is registered trademark of GXi Outdoor Power, LLC Clayton, NC 27520 USA.
No part of this publication can be printed or copied without written permission.
15 of 16
Heavy Duty Power Equipment
4550 Pro, 5650, 6500(EL), 7550 Pro
Limited Warranty & Service
LENGTH OF WARRANTY:*
(FROM THE DATE OF ORIGINAL RETAIL PURCHASE)
PRODUCTS COVERED BY THIS WARRANTY:
NONCOMMERCIAL/ NON-
COMMERCIAL
RENTAL
RENTAL
Engine
36 months / 300 hours
12 months / 300 hours
3 months
3 months / 300 hours
3 months
Battery
3 months
Alternator
36 months / 300 hours
24 months / 300 hours
36 months
12 months / 300 hours
12 months /300 hours
36 months
3 months / 300 hours
3 months / 300 hours
36 months
Electrical and Frame Components
Emission Controls
*LENGTH OF WARRANTY: All warranty coverage expires when the operating hours exceed 300 hours.
TO QUALIFY FOR THIS WARRANTY:
The product must be purchased in the United States from a dealer authorized by GXi Outdoor Power, LLC to sell those products. This warranty applies to first retail pur-
chaser / owner during the applicable warranty time period. SAVE YOUR PROOF OF PURCHASE RECEIPT.
WHAT DEK POWER EQUIPMENT WILL REPAIR OR REPLACE UNDER WARRANTY:
DEK will repair or replace, at its option, any part that is proven to be defective in material or workmanship under normal use during the applicable warranty time period
subject to the exclusions stated herein. This warranty is void if the owner fails to follow the prescribed maintenance and operating procedures described in this manual.
This specifically refers to ensuring routine oil changes are made, that fuel stabilizer is used for long-term storage, that the generator is not overloaded, and that the gen-
erator loads are distributed evenly between the A and B outlets. Dirty carburetors, spark plugs, air filters, fuel filters, and freight or handling damage are not covered
under warranty.
DEK has the right to recover warranty administration costs from the owner if the root cause of the malfunction was found to be other than defective material or workman-
ship. In particular, this warranty does not cover: contaminants in the fuel or oil; damage caused by not following the prescribed warnings and operating practices; failure
to follow proper maintenance and storage procedures; and physical damage due to shipping or handling or storage. Damage to the generator that occurs as a result of
connecting a DEK generator to household wiring without the use of a UL approved transfer switch device that is connected to the home or business and grounded as per
applicable local electrical codes, is not covered by this warranty.
Warranty repairs will be made without charge for parts and labor for the first year. After the first year, this limited warranty covers the costs of replacement parts only.
Anything replaced under warranty becomes the property of DEK. Parts replaced under warranty will be considered as part of the original product and any warranty on
those parts will expire coincident with the original product warranty.
TO OBTAIN WARRANTY SERVICE:
You must take the DEK Power Equipment product, accessory, replacement part, apparel or the power equipment on which the accessory or replacement part is installed,
and proof of purchase, at your expense, to any DEK Power Equipment service location in the United States, who is authorized to service that product, during the service
location’s normal business hours. If you are unable to obtain warranty service, or are dissatisfied with the warranty service you receive, take the following steps: First,
contact the manager of the service center involved; normally this will resolve the problem. However, if you should require further assistance, write or call the DEK Cus-
tomer Service.
EXCLUSIONS:
THIS WARRANTY DOES NOT EXTEND TO PARTS AFFECTED OR DAMAGED BY ACCIDENT AND/OR COLLISION, NORMAL WEAR, FUEL CONTAMINATION, USE
IN AN APPLICATION FOR WHICH THE PRODUCT WAS NOT DESIGNED OR ANY OTHER MISUSE, NEGLECT, INCORPORATION OR USE OF UNSUITABLE AT-
TACHMENTS OR PARTS, UNAUTHORIZED ALTERATION, OR ANY CAUSES OTHER THAN DEFECTS IN MATERIAL OR WORKMANSHIP OF THE PRODUCT.
Consumable parts such as oil, spark plugs, filters, carburetors, are not covered by this warranty.
DISCLAIMER OF CONSEQUENTIAL DAMAGE AND LIMITATION OF IMPLIED WARRANTIES:
DEK DISCLAIMS ANY RESPONSIBILITY FOR LOSS OF TIME OR USE OF THE PRODUCT, TRANSPORTATION, COMMERCIAL LOSS, OR ANY OTHER INCIDEN-
TAL OR CONSEQUENTIAL DAMAGE. ANY IMPLIED WARRANTIES ARE LIMITED TO THE DURATION OF THIS WRITTEN LIMITED WARRANTY.
This warranty is void if the manufacturing date and the serial number on the equipment has been removed or the equipment has been modified.
EMISSION CONTROL SYSTEM INFORMATION
The U.S. and California Clean Air Acts
EPA and California regulations require all manufacturers to furnish written instructions describing the operation and maintenance of emission control systems. The follow-
ing instructions and procedures must be followed in order to keep the emissions from your DEK engine within the emission standards. Maintenance, replacement, or
repair of the emission control devices and systems may be performed by any engine repair establishment or individual, using parts that are ‘‘certified’’ to EPA standards.
The emission control systems on your DEK engine were designed, built, and certified to conform with EPA regulations. We recommend the use of genuine DEK parts
whenever you have maintenance done. These original-design replacement parts are manufactured to the same standards as the original parts, so you can be confident of
their performance. The use of replacement parts that are not of the original design and quality may impair the effectiveness of your emission control system. A manufac-
turer of an aftermarket part assumes the responsibility that the part will not adversely affect emission performance. The manufacturer or re-builder of the part must certify
that use of the part will not result in a failure of the engine to comply with emission regulations.
Emission controls are covered by this warranty for all uses for a period of 3 years from original retail purchase date, this coverage extends to subsequent owners of the
product with proof of original purchase.
Rev. 1/2010
DEK® is registered trademark of GXi Outdoor Power, LLC Clayton, NC 27520 USA.
No part of this publication can be printed or copied without written permission.
16 of 16
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