Harbor Freight Tools Air Compressor 67853 User Manual
30 Gallon, 180 PSI  
Gas Powered Two-Stage Air Compressor  
67853 Air Compressor  
Using an engine indoors CAN KILL YOU  
IN MINUTES.  
Engine exhaust contains carbon monoxide.  
This is a poison you cannot see or smell.  
Only use OUTSIDE  
NEVER use inside  
and far away from  
windows, doors,  
and vents.  
a home or garage,  
EVEN IF doors and  
windows are open.  
When unpacking, make sure that the product is intact and undamaged.  
If any parts are missing or broken, please call 1-800-444-3353 as soon as possible.  
Record Product’s Serial Number Here:  
Note: If product has no serial number, record month and year of purchase instead.  
Note: Some parts are listed and shown for illustration purposes only, and are not available individually  
as replacement parts.  
Visit our website at: http://www.harborfreight.com  
Email our tech support at: [email protected]  
©
®
Copyright 2010 by Harbor Freight Tools . All rights reserved. No portion of this manual or any artwork contained herein may be reproduced in any shape  
or form without the express written consent of Harbor Freight Tools. Diagrams within this manual may not be drawn proportionally. Due to continuing  
improvements, actual product may differ slightly from the product described herein. Tools required for assembly and service may not be included.  
Manual Revised 11e  
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Save This Manual  
Symbol Definitions  
Keep this manual for the safety warnings and precautions,  
assembly, operating, inspection, maintenance and cleaning  
procedures. Write the product’s serial number in the  
back of the manual near the assembly diagram (or month  
and year of purchase if product has no number). Keep  
this manual and the receipt in a safe and dry place for  
future reference.  
Symbol  
Property or Statement  
Revolutions Per Minute  
RPM  
Horsepower  
HP  
WARNING marking concerning Risk of Eye  
Injury. Wear ANSI-approved safety goggles  
with side shields.  
Safety Warnings  
Read the manual before set-up and/or use.  
In this manual, on the labeling, and all other information  
provided with this product:  
WARNING marking concerning Risk of  
Hearing Loss. Wear hearing protection.  
This is the safety alert symbol. It is used  
to alert you to potential personal injury  
hazards. Obey all safety messages that  
follow this symbol to avoid possible injury  
or death.  
WARNING marking concerning Risk  
of Respiratory Injury. Operate engine  
OUTSIDE and far away from windows,  
doors, and vents.  
WARNING marking concerning Risk of Fire  
while handling fuel. Do not smoke while  
handling fuel.  
DANGER indicates a hazardous situation which, if not  
avoided, will result in death or serious injury.  
WARNING marking concerning Risk of Fire.  
Do not refuel while operating.  
Keep flammable objects away from engine.  
WARNING indicates a hazardous situation which, if not  
avoided, could result in death or serious injury.  
WARNING marking concerning Risk of  
Explosion.  
CAUTION, used with the safety alert symbol, indicates  
a hazardous situation which, if not avoided, could  
result in minor or moderate injury.  
WARNING! Read all instructions.  
Failure to follow all instructions listed below  
may result in fire, serious injury and/or DEATH.  
The warnings and precautions discussed in this  
manual cannot cover all possible conditions and  
situations that may occur. It must be understood  
by the operator that common sense and caution  
are factors which cannot be built into this product,  
but must be supplied by the operator.  
NOTICE is used to address practices not related to  
personal injury.  
CAUTION, without the safety alert symbol, is used to  
address practices not related to personal injury.  
SAVE THESE INSTRUCTIONS  
Set up Precautions  
1. Gasoline fuel and fumes are flammable, and potentially  
explosive. Use proper fuel storage and handling  
procedures. Do not store fuel or other flammable  
materials nearby.  
2. Have multiple ABC class fire extinguishers nearby.  
3. Operation of this equipment may create sparks that  
can start fires around dry vegetation. A spark arrestor  
may be required. The operator should contact local  
fire agencies for laws or regulations relating to fire  
prevention requirements.  
Item 67853  
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4. Set up and use only on a flat, level,  
9. Do not leave the equipment unattended when it is  
running. Turn off the equipment (and remove safety  
keys, if available) before leaving the work area.  
well-ventilated surface.  
5. Use only lubricants and fuel recommended in the  
engine manual or in the Specifications chart of  
this manual.  
10. Wear ANSI-approved safety glasses, hearing  
protection, and NIOSH-approved dust mask/respirator  
under a full face shield along with steel-toed work boots  
during use.  
6. Wear ANSI-approved safety goggles, heavy-duty work  
gloves, and dust mask/respirator during set up.  
11. People with pacemakers should consult their  
physician(s) before use. Electromagnetic fields in  
close proximity to a heart pacemaker could cause  
pacemaker interference or pacemaker failure. Caution  
is necessary when near the engine’s magneto or  
recoil starter.  
Engine Precautions  
Follow engine precautions and instructions in the included  
engine instruction manual.  
12. Use only accessories that are recommended by Harbor  
Freight Tools for your model. Accessories that may  
be suitable for one piece of equipment may become  
hazardous when used on another piece of equipment.  
Operating Precautions  
1.  
CARbON MONOxIDE HAzARD  
Using an engine indoors CAN KILL  
YOU IN MINUTES.  
13. Do not operate in explosive atmospheres, such  
as in the presence of flammable liquids, gases, or  
dust. Gasoline-powered engines may ignite the dust  
or fumes.  
Engine exhaust contains carbon  
monoxide. This is a poison you cannot  
see or smell.  
14. Stay alert, watch what you are doing and use common  
sense when operating this piece of equipment. Do not  
use this piece of equipment while tired or under the  
influence of drugs, alcohol or medication.  
15. Do not overreach. Keep proper footing and balance at  
all times. This enables better control of the equipment  
in unexpected situations.  
NEVER use inside a home or garage, EVEN IF doors  
and windows are open.  
16. Dress properly. Do not wear loose clothing or jewelry.  
Keep hair, clothing and gloves away from moving parts.  
Loose clothes, jewelry or long hair can be caught in  
moving parts.  
17. Parts, especially exhaust system components, get very  
hot during use. Stay clear of hot parts.  
18. Do not cover the engine or equipment during operation.  
Only use OUTSIDE and far away from windows, doors,  
and vents.  
19. Keep the equipment, engine, and surrounding area  
clean at all times.  
2. Keep children away from the equipment, especially  
while it is operating.  
20. Use the equipment, accessories, etc., in accordance  
with these instructions and in the manner intended for  
the particular type of equipment, taking into account the  
working conditions and the work to be performed. Use  
of the equipment for operations different from those  
intended could result in a hazardous situation.  
3. Fire Hazard! Do not fill gas tank while Compressor  
engine is running. Do not operate if gasoline has been  
spilled. Clean spilled gasoline before starting engine.  
Do not operate near pilot light or open flame.  
4. Do not touch Compressor engine during use. Let  
engine cool down after use.  
21. Do not operate the equipment with known leaks in the  
engine’s fuel system.  
5. Never store fuel or other flammable materials near  
22. This product contains or, when used, produces a  
chemical known to the State of California to cause  
cancer and birth defects or other reproductive harm.  
(California Health & Safety Code § 25249.5, et seq.)  
the Compressor engine.  
6. Only use a suitable means of transport and lifting  
devices with sufficient weight bearing capacity when  
transporting the Compressor.  
23. When spills of fuel or oil occur, they must be cleaned  
up immediately. Dispose of fluids and cleaning  
materials as per any local, state, or federal codes  
and regulations. Store oil rags in a bottom-ventilated,  
covered, metal container.  
7. Secure the Compressor on transport vehicles to  
prevent the tool from rolling, slipping, and tilting.  
8. Industrial applications must follow OSHA requirements.  
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24. Keep hands and feet away from moving parts. Do not  
reach over or across equipment while operating.  
7. Store equipment out of the reach of children.  
8. Follow scheduled engine and equipment maintenance.  
25. Before use, check for misalignment or binding of  
moving parts, breakage of parts, and any other  
condition that may affect the equipment’s operation.  
If damaged, have the equipment serviced before  
using. Many accidents are caused by poorly  
maintained equipment.  
Air Compressor Safety Warnings  
1. Risk of fire or explosion - Do not spray flammable liquid  
in a confined area or towards a hot surface. Spray area  
must be well-ventilated. Do not smoke while spraying  
or spray where spark or flame is present. Arcing parts -  
Keep compressor at least 20 feet away from explosive  
vapors, such as when spraying with a spray gun.  
26. Use the correct equipment for the application. Do not  
modify the equipment and do not use the equipment for  
a purpose for which it is not intended.  
2. Risk of bursting - Do not adjust regulator higher than  
maximum stated pressure of attachment.  
Service Precautions  
1. before service, maintenance, or cleaning:  
a. Turn the engine switch to its “OFF” position.  
b. Allow the engine to completely cool.  
3. Risk of injury - Do not direct air stream at people  
or animals.  
4. Do not use to supply breathing air.  
5. Do not use the air hose to move the compressor.  
c. Then, remove the spark plug cap from the  
6. Drain Tank daily and after use. Internal rust causes  
tank failure and explosion.  
spark plug.  
2. Keep all safety guards in place and in proper working  
order. Safety guards include muffler, air cleaner,  
mechanical guards, and heat shields, among  
other guards.  
7. Add correct amount of compressor oil before first  
use and every use. Operating with the incorrect  
amount of oil causes permanent damage and voids  
warranty. To prevent damage, do not use with  
overfilled or low oil.  
3. Do not alter or adjust any part of the equipment  
or its engine that is sealed by the manufacturer  
or distributor. Only a qualified service technician  
may adjust parts that may increase or decrease  
governed engine speed.  
8. Compressor head gets hot during operation. Do not  
touch it or allow children nearby during or immediately  
following operation.  
9. Release the pressure in the storage tank  
before moving.  
4. Wear ANSI-approved safety goggles, heavy-duty work  
gloves, and dust mask/respirator during service.  
10. The use of accessories or attachments not  
recommended by the manufacturer may result in a risk  
of injury to persons.  
5. Maintain labels and nameplates on the equipment.  
These carry important information. If unreadable  
or missing, contact Harbor Freight Tools for  
a replacement.  
11. All air line components, including hoses, pipe,  
connectors, filters, etc., must be rated for a minimum  
working pressure of 125 PSI, or 150% of the maximum  
system pressure, whichever is greater.  
6. Have the equipment serviced by a qualified repair  
person using only identical replacement parts. This will  
ensure that the safety of the equipment is maintained.  
Do not attempt any service or maintenance procedures  
not explained in this manual or any procedures that  
you are uncertain about your ability to perform safely  
or correctly.  
SAVE THESE  
INSTRUCTIONS.  
Item 67853  
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Engine Controls  
Pump Safety Valve (91)  
Belt Guard Frame (121) &  
Belt Guard Cover (129)  
Pilot Valve  
Air Filter  
Assembly (84)  
ON/OFF Switch  
Oil  
Sight  
Glass  
(19)  
Tank  
Pressure  
Gauge (97)  
Tank Safety Valve  
(98)  
Air  
Outlet  
(105)  
Drain Valve (137)  
Crankcase (16)  
1. belt Guard - The Belt Guard encloses the pulleys and drive belts.  
It protects the user from the moving parts and allows the large  
pulley to direct cooling air to the Air Pump.  
2. Oil Sight Glass - The oil sight glass shows proper level of the oil.  
Oil level should be at center of Sight Glass.  
OIL LEVEL  
Oil Sight Glass (19)  
3. Tank Drain Valve - The Air Tank Drain Valve allows moisture to be  
removed from the tank to prevent corrosion.  
OVERFILL  
FULL  
4. Safety Valve - The Safety Valve automatically releases air if the Air  
Tank pressure exceeds the preset maximum. In an emergency, the  
ring can be pulled to relieve tank air pressure. There is one safety  
valve on the pump and one on the tank.  
LOW  
5. Air Outlet - An air hose attaches to this valve. Air pressure  
required by tools is set by an air pressure regulator.  
6. Air Storage Tank - The Air Tank is where air pressurized by the Air  
Opened  
Pilot Valve  
Pump is stored for use.  
7. Tank Pressure Gauge - The Air Tank Pressure Gauge displays the  
air pressure in the tank.  
8. Pilot Valve - Open the Pilot Valve before starting the engine. It  
relieves resistance on the engine to make starting possible. Rotate  
the pin so it is vertical to open it. Once the engine is running, close  
the Pilot Valve so the Compressor can build up pressure.  
Closed  
Pilot Valve  
REV 11c  
For technical questions, please call 1-800-444 3353.  
Item 67853  
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Set up  
The emission control system for this Compressor’s Engine is warranted for standards set by the U.S. Environmental  
Protection Agency and by the California Air Resources Board (also known as CARB). For warranty information, refer to  
the engine manual.  
Mounting to a Truck bed  
1. Before mounting, if needed, reinforce the area with plywood or steel plating.  
2. With assistance, move the compressor to the truck bed location and mark the floor of the truck bed through the holes  
in the compressor’s feet. Check for any hidden wiring or cables and adjust the location for the holes as needed. Then,  
temporarily set the compressor aside.  
3. Drill the four 1/2” diameter holes through the truck bed and any reinforcing materials.  
4. Set the compressor back in place, and align the foot holes with the pre-drilled holes. Use four 1/2” diameter, bolts,  
washers and lock washers (all not included) to secure the compressor in place.  
Air Filter  
Assembly (84)  
Second Stage  
Cylinder Head  
(21)  
First Stage  
Cylinder Head  
(61)  
Wing Nut  
Connector  
Assembly  
To install the Air Filter Assembly (84), fit the Connector into the  
Air Filter Assembly and slide the assembly into the hole on the  
side of the First Stage Cylinder Head (61). Secure in place with  
the Wing Nut.  
break-In Compressor  
Break in the new Air Compressor as follows:  
a. Make sure the engine is off. Open the air outlet valve on the left side of the tank.  
b. Check all fluid levels in the engine and pump.  
c. Start the engine following the General Operating Instructions.  
d. Let the unit run for 30 minutes. Air will expel freely through the Coupler.  
e. Turn OFF the engine.  
f. Remove the male coupler.  
Connection  
Connect a regulator valve, an in-line shut off valve and a 1/2” NPT air hose (all sold separately) to the Quick  
Coupler. The air hose must be long enough to reach the work area with enough extra length to allow free movement  
while working.  
Note: An in-line shutoff ball valve is an important safety device because it controls the air supply even if the air  
hose is ruptured. The shutoff valve should be a ball valve because it can be closed quickly.  
1. Depending on the tool which you will be using with this compressor, you may need to incorporate additional  
components, such as an in-line oiler, a filter, or a dryer (all sold separately). Consult your air tool’s manual for needed  
accessories. See Typical Air Line Setup charts on the following pages. This is a truckbed compressor, so use the  
portable setup as a model.  
Item 67853  
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Air Tool & Spray Gun Portable Setup  
For technical questions, please call 1-800-444 3353.  
Item 67853  
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Air Tool & Spray Gun Stationary Setup  
Item 67853  
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Operation  
Read the ENTIRE IMPORTANT SAFETY INFORMATION section at the beginning of this manual including  
all text under subheadings therein before set up or use of this product.  
Using the Compressor  
Inspect Compressor, engine, pump and equipment looking for damaged, loose, and missing parts before set up and  
starting. If any problems are found, do not use equipment until fixed properly.  
Note: At the beginning of the day’s first use of the Air Compressor, check for air leaks by applying soapy water to  
connections while the Air Compressor is pumping and after pressure cut-out. Look for air bubbles. If air bubbles are  
present at connections, tighten connections. Do not use the air compressor unless all connections are air tight. The extra  
air leaking out will cause the compressor to operate too often, increasing wear on the compressor.  
before starting the Compressor:  
a. Follow the Set Up Instructions in the equipment manual to prepare the equipment.  
b. Follow the Set Up Instructions in the Engine manual to prepare the engine.  
c. Inspect all components of the setup. Make sure all nuts and bolts are tight.  
d. Fill the Engine with the proper amount and type of both fuel and oil.  
e. Fill the Compressor Pump with compressor oil following the Maintenance Instructions in  
this manual.  
To Start and Use the Compressor  
1
1. Close the Drain Valve (137) by turning the lever up so that it  
is perpendicular to the valve.  
2
2. Close the in-line Shutoff Valve between the compressor and  
the air hose.  
3
3. Open the Pilot Valve by rotating it to a vertical position.  
4. Open the Fuel Valve.  
4
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Item 67853  
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5. To start a cold engine, move the Choke to the CHOKE (start/  
closed) position.  
5
To restart a warm engine, leave the Choke in the  
RUN position.  
6. For MANUAL START  
For ELECTRIC START  
A. Turn the Engine Switch to ON.  
Turn the Engine Switch to START.  
Note: To prolong starter life, use short starting cycles  
(5 seconds maximum). Then wait one minute before  
attempting to start again.  
ON  
ON  
OFF  
START  
b. Grip the Starter Handle of the Engine loosely and pull it  
slowly several times to allow the gasoline to flow into the  
Engine’s carburetor. Then pull the Starter Handle gently until  
resistance is felt. Allow Cable to retract fully and then pull it  
quickly. Repeat until the engine starts. Note: Do not let the  
Starter Handle snap back against the engine. Hold it as it  
recoils so it doesn't hit the engine.  
ON  
START  
OFF  
START  
7. Allow the Engine to run for several seconds. Then, if the  
Choke lever is in the CHOKE position, move the Choke  
Lever very slowly to its RUN position.  
7
Note: Moving the Choke Lever too fast could kill the engine.  
8. Close the Pilot Valve by rotating it to a horizontal position.  
8
Item 67853  
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9. When the Gas Engine is started and running, the  
compressor Pump starts compressing air into the Air Tank.  
Open the in-line Shutoff Valve and adjust the Pressure  
Regulator (sold separately) so that the air output is enough  
to properly power the tool, but the output will not exceed  
the tool’s maximum air pressure at any time. Turn the knob  
clockwise to increase the pressure and counterclockwise  
to decrease pressure. Adjust the pressure gradually, while  
checking the air output gauge to set the pressure.  
9
IMPORTANT: Allow the engine to run for five minutes with no load after each start-up so that the engine can stabilize.  
Maintenance break-in Period:  
Breaking-in the engine will help to ensure proper equipment and engine operation. The maintenance break-in period  
will last about 20 hours of use. After this period, change the engine oil.  
Under normal operating conditions, subsequent maintenance follows the schedule explained in the MAINTENANCE  
AND SERVICING section.  
Note: When maximum tank pressure is reached, the compressor automatically disengages, and the engine RPM drops  
down to idle speed. The engine remains at idle until Air Tank pressure falls to a preset level. The Gas Engine will then  
accelerate and air pressure once again begins to build up in the Air Tank.  
Note: As long as the engine is running, the operation of the Air Compressor is automatic, controlled by an internal  
pressure switch.  
IMPORTANT: The internal pressure switch is not user adjustable; do not make changes to the air pressure settings of  
the internal pressure switch. Any change to the automatic pressure levels may cause excess pressure to accumulate,  
causing a hazardous situation.  
Note: Depressurization - If it is necessary to quickly depressurize the Compressor, turn OFF the engine. Then, pull on  
the ring on the tank Safety Valve to release stored air pressure.  
10. Use the air tool as needed.  
10  
ON  
OFF  
OFF  
START  
11. After the job is complete, turn OFF the engine.  
To stop the engine in an emergency, turn the Engine Switch off.  
Under normal conditions, use the following procedure:  
a. Turn the Engine Switch off.  
11  
b. Close the Fuel Valve.  
For technical questions, please call 1-800-444 3353.  
Item 67853  
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12. Close the in-line Shutoff Valve.  
12  
13  
14  
13. Bleed air from the tool then disconnect the tool.  
14. Open the Drain Valve at the bottom of the Tank, to release  
any built-up moisture and the internal tank pressure.  
15. Clean, then store the Air Compressor indoors.  
Item 67853  
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Adding Oil  
Maintenance  
Crankcase (16)  
WARNING  
TO PREVENT SERIOUS INjURY FROM ACCIDENTAL  
STARTING:  
Turn the Power Switch of the equipment to its “OFF”  
position, release tank air pressure, wait for the engine  
to cool, and disconnect the spark plug cap before  
performing any inspection, maintenance, or cleaning  
procedures.  
OIL LEVEL  
Oil Sight Glass (19)  
OVERFILL  
FULL  
TO PREVENT SERIOUS INjURY FROM EqUIPMENT  
FAILURE:  
LOW  
Do not use damaged equipment. If abnormal noise,  
vibration, or excess smoking occurs, have the problem  
corrected before further use.  
1. The oil level should be at the center of the “full” level  
on the Oil Sight Glass, as shown above. Add oil as  
needed to maintain this level. Do not let the oil level  
go below the center dot (LOW as shown above) and  
do not overfill the oil so that it is above the center dot  
(OVERFILL as shown above) on the Oil Sight Glass.  
Follow all service instructions in this manual. The  
engine may fail critically if not serviced properly.  
Maintenance Procedures  
Many maintenance procedures, including any  
not detailed in this manual, will need to be  
performed by a qualified technician for safety.  
If you have any doubts about your ability to  
safely service the equipment or engine, have  
a qualified technician service the equipment  
instead.  
2. To add oil:  
a. Remove the Oil Plug (17).  
b. Using a funnel to avoid spills, pour enough oil into  
the pump Crankcase to reach the “full” level in the  
Oil Sight Glass.  
c. Replace the Oil Plug.  
Cold Weather Operation  
Compressor Pump Oil  
Maintenance  
Premium quality 30-weight, non-detergent air  
compressor oil (sold separately) is recommended for  
use with this compressor. Start compressor in heated  
area if outdoor temperatures drop below 32° F. If this  
is not practical, drain out the old pump oil and use  
SAE 10W Non-detergent Air Compressor Oil in the  
pump crankcase instead whenever the compressor’s  
temperature will fall below 40°. Do not use multi-  
viscosity oil (such as 10W-30), they leave carbon  
deposits on pump components and lead to accelerated  
failure. Heavy operation may require heavier  
viscosity oil.  
Check oil periodically for clarity. Replace oil if it appears  
milky or if debris is present, or every 6 months, or  
100 hours of runtime, whichever comes first. In harsh  
environments such as high heat or high humidity, you  
will need to replace the oil more frequently.  
Change the compressor oil after the first hour of  
use to remove any debris.  
3. If uncertain which oil to use for this compressor,  
please call Harbor Freight Tools customer service at  
1-800-444-3353 for assistance.  
WARNING! To prevent serious injury from burns: Do not  
add or change the oil while the compressor is in operation.  
Allow the compressor to cool before replacing oil.  
For technical questions, please call 1-800-444 3353.  
Item 67853  
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Maintenance  
Changing Oil  
Adjusting belt Tension  
1. Remove the Belt Guard Cover (129) and set it aside.  
To drain the oil from the Pump Crankcase:  
a. Place a container under the Drain Plug.  
Deflection  
Distance  
b. Remove the Oil Plug to allow air flow into the Pump.  
c. Remove the Drain Plug, allowing the oil to drain into  
the container.  
d. When the oil is completely drained from the Pump,  
replace the Drain Plug.  
e. Fill the Pump with new compressor oil to the FULL  
level on the Oil Sight Glass.  
2. Press on the center of the longest span on each  
belt with moderate finger pressure (4-4.5 lb.). Then  
measure the deflection distance, the distance that the  
belt moved. The belt should deflect anywhere from  
1/2” to 1”.  
f. Replace and tighten the Oil Plug.  
g. Discard the old oil according to local, state and  
federal regulations.  
Engine Base  
Draining Moisture from the Tank  
The Drain Valve is located under the Tank. It must be  
accessed daily to release all trapped air and moisture  
from the Tank. This will eliminate condensation which  
can cause tank corrosion.  
Engine  
Threaded Rod  
Mounting  
(118)  
Bolts  
To empty the air and condensation:  
Bolts (110)  
a. Make sure the compressor engine is off.  
b. Place a collection pan under the Drain Valve.  
c. Open the Drain Valve by pivoting the lever on the  
bottom of the Compressor so the lever is in line with  
the Drain Valve.  
Bottom Plate (114)  
Nut (115)  
d. When all the pressure is released, close the  
Drain Valve by pivoting the lever on the bottom of  
the compressor so that the lever is perpendicular to  
the Drain Valve.  
3. If either belt deflects too much, tighten belts by  
loosening the four Bolts (110) on the Bottom Plate (114)  
and moving the engine away from the other pulley  
slightly by turning the Nut (115) holding the Threaded  
Rod (118). Secure engine mounting bolts and retest  
tension. If either belt is too long to be properly  
tensioned, both belts must be replaced.  
Air Filter Maintenance  
Check the Air Filter weekly to see if it needs  
replacement. If working in dirty environments, you may  
need to replace the filter more often. To replace the  
Air Filter:  
4. If either belt deflects too little, loosen belts by  
loosening the Bolts on the Bottom Plate and moving the  
engine towards the other pulley slightly by turning the  
Nut (115) on the Threaded Rod (118). Secure engine  
mounting bolts and retest tension.  
a. Unthread the Wing Nut holding the Air Filter  
Assembly in place.  
b. Remove the Air Filter Assembly.  
c. Replace with a new Air Filter.  
d. Secure in place with the Wing Nut.  
5. Before use, replace belt cover.  
Item 67853  
For technical questions, please call 1-800-444 3353.  
Page 13  
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Troubleshooting  
Problem  
Possible Causes  
Likely Solutions  
Engine will  
not start  
COMPRESSOR SPECIFIC:  
COMPRESSOR SPECIFIC:  
1. Pilot Valve closed.  
1. Open pilot valve before start procedure, close after unit is  
running.  
(Note: See engine  
manual for engine  
specific issues.)  
2. Tank already pressurized.  
2. Turn engine on. Compressor will turn on as needed when  
pressure reaches preset level.  
1. Incorrect lubrication or not  
enough lubrication.  
1. Lubricate using recommended oil or grease according to  
directions.  
Compressor  
overheats  
2. Worn parts.  
2. Have qualified technician inspect internal mechanism and  
replace parts as needed.  
1. Poor air outlet seal.  
1. Tighten or re-attach using thread seal tape.  
2. Loose cylinder/cylinder head. 2. Tighten cylinder/cylinder head assembly. If cylinder/cylinder  
head cannot tighten properly, internal parts may be misaligned.  
Severe air  
leakage  
3. Damaged valve or housing.  
3. Replace damaged components.  
4. Dirty, worn or damaged valve. 4. Clean or replace valve assembly.  
1. Low engine idle.  
1. Qualified technician should increase idle to 2,200±100 RPM by  
adjusting pressure switch.  
2. Severely clogged air filter.  
2. Replace air filter.  
Unit stalls  
3. Improper lubrication.  
3. Check for proper oil level.  
4. Defective pilot/unloader valve. 4. Replace pilot valve.  
1. Loose drive pulley or flywheel. 1. Loose pulleys are a common cause of “knocking”. Tighten  
appropriate bolts.  
2. Misaligned pulleys.  
3. Lack of oil in crankcase.  
4. Worn connecting rod.  
5. Worn wrist pin bushing.  
6. Worn bearings.  
2. Align pulleys with straightedge and secure in place.  
3. Check for proper oil level.  
Excessive noise  
4. Replace connecting rod.  
5. Remove piston assembly and replace necessary parts.  
6. Replace bearings and oil.  
7. Loose belts.  
7. Check for proper belt tension.  
1. Wrong type of oil or low-  
quality oil.  
1. Change oil. Check oil recommendations under EQUIPMENT  
SET UP, Equipment Oil Fill section of this manual.  
2. Overheating.  
2. See above Excessive Noise section.  
3. Clean or replace air filter.  
Oil in the  
discharge air  
3. Restricted intake air.  
4. Worn piston rings.  
4. Replace piston rings.  
5. Excessive moisture in the  
tank.  
5. Drain moisture from the tank daily.  
1. Air leaks.  
1. Listen for escaping air. Apply soap solution to all fittings and  
connections. Bubbles will appear at points of leakage. Tighten  
or replace leaking fittings or connections.  
2. Leaking valves.  
2. Remove head and inspect for valve breakage, weak  
valves, scored valve plate, etc. Replace defective parts and  
reassemble. Replace head gasket each time the head is  
removed.  
Low discharge  
pressure  
3. Restricted air intake.  
4. Blown gaskets.  
5. Slipping belts.  
3. Clean or replace air filter element.  
4. Replace and gaskets proven faulty on inspection.  
5. Tighten Belts (See monthly maintenance.)  
Follow all safety precautions whenever diagnosing or servicing the equipment or engine.  
For technical questions, please call 1-800-444 3353.  
Item 67853  
Page 14  
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PLEASE READ THE FOLLOWING CAREFULLY  
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLy DIAGRAM IN  
THIS MANUAL AS A REFERENCE TOOL ONLy. NEITHER THE MANUFACTURER OR DISTRIBUTOR MAKES ANy  
REPRESENTATION OR WARRANTy OF ANy KIND TO THE BUyER THAT HE OR SHE IS QUALIFIED TO MAKE ANy  
REPAIRS TO THE PRODUCT, OR THAT HE OR SHE IS QUALIFIED TO REPLACE ANy PARTS OF THE PRODUCT.  
IN FACT, THE MANUFACTURER AND/OR DISTRIBUTOR ExPRESSLy STATES THAT ALL REPAIRS AND PARTS  
REPLACEMENTS SHOULD BE UNDERTAKEN By CERTIFIED AND LICENSED TECHNICIANS, AND NOT By  
THE BUyER. THE BUyER ASSUMES ALL RISK AND LIABILITy ARISING OUT OF HIS OR HER REPAIRS TO THE  
ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO, OR ARISING OUT OF HIS OR HER INSTALLATION OF  
REPLACEMENT PARTS THERETO.  
Item 67853  
For technical questions, please call 1-800-444 3353.  
Page 15  
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Pump Parts List  
Part  
Description  
Bolt M12×55  
Spring Washer 12  
qty  
1
1
1
1
1
1
1
1
6
1
1
1
1
1
1
1
1
1
1
1
1
4
4
1
1
1
2
4
2
1
2
1
1
2
2
1
1
1
4
4
8
4
4
1
1
1
1
Part  
Description  
qty  
1
1
4
4
1
1
1
1
2
2
1
1
1
1
4
4
1
2
1
1
2
2
1
2
1
1
2
2
1
1
1
4
8
4
4
4
1
1
4
4
4
4
1
1
1
1
1
1
2
3
4
5
6
7
8
9
48 Brass Tube  
49 Cylinder Head  
50 Spring Washer  
51 Bolt M10×65  
52 Bolt M8×60  
53 Spring Washer 10  
54 Nut  
Flat Washer  
Drive Pulley  
Oil Seal Circle  
Flange Plate  
O-ring φ85  
Bearing  
55 Elbow  
Bolt M12×40  
56 Bolt M8×35  
57 Spring Washer 8  
58 Gasket  
10 Oil Breather  
11 Crank Case End Cover  
12 Flat Key  
13 Crankshaft  
14 Bearing  
15 Gasket  
16 Crankcase  
17 Oil Plug  
59 Radiator  
60 Connector  
61 First Stage Cylinder Head  
62 Bolt M12×40  
63 Spring Washer 12  
64 Gasket  
18 Gasket  
65 Bushing  
19 Oil Sight Glass  
20 Drain Oil Bolt  
21 Second Stage Cylinder Head  
22 Bolt M12×40  
23 Spring Washer 12  
24 Gasket  
25 Connecting Rod A  
26 Connecting Rod B  
27 Bearing Shell  
28 Spring Washer 10  
29 Bolt M10×55  
30 Bushing  
31 Clip  
32 Pin  
33 Piston  
34 Wiper Ring  
35 Piston Ring  
36 Gasket  
66 Connecting Rod A  
67 Connecting Rod B  
68 Spring Washer 10  
69 Bolt M10×55  
70 Bushing  
71 Wiper Ring  
72 Piston  
73 Pin  
74 Clip  
75 Piston Ring  
76 Gasket  
77 Valve  
78 Aluminum Seal  
79 Bolt M8×30  
80 Spring  
81 Restrictor  
82 Valve Plate  
83 Nut M8  
84 Air Filter Assembly  
85 Cylinder Head  
86 Spring Washer 12  
87 Bolt M12×70  
88 Spring Washer 8  
89 Bolt M8×70  
90 Nut  
91 Pump Safety Valve  
92 Elbow  
93 Taper Sleeve  
94 Nut  
37 Valve  
38 Aluminum Seal  
39 Bolt M6×25  
40 Valve Stop Block  
41 Spring  
42 Valve Plate  
43 Nut M6  
44 Lock Nut  
45 Elbow  
46 Taper Sleeve  
47 Nut  
For technical questions, please call 1-800-444 3353.  
Item 67853  
Page 16  
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Pump Assembly Diagram  
Item 67853  
For technical questions, please call 1-800-444 3353.  
Page 17  
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Tank Parts List  
Part  
95 Tank  
Description  
qty  
1
Part  
117 Bracket  
Description  
qty  
1
96 Connector  
1
1
1
1
1
1
2
2
118 Threaded Rod  
119 Bolt M6×20  
120 Belt Guard Bracket A  
121 Belt Guard Frame  
122 Belt  
123 Driven Pulley  
124 Key  
125 Bushing  
1
1
1
1
2
1
1
1
97 Pressure Gauge  
98 Tank Safety Valve  
99 Unloader Valve  
100 Throttle Control  
101 Connector  
102 Taper Sleeve  
103 Pipe Nut  
104 Brass Tube  
105 Air Outlet  
106 Engine  
107 Bolt M10×40  
108 Nut M10  
109 Bracket  
1
1
1
4
4
1
4
4
126 Spring Washer 8  
127 Bolt M8×30  
128 Bolt M6×10  
129 Belt Guard Cover  
130 Bolt M6×10  
131 Belt Guard Bracket B  
132 Bolt M8×16  
133 Washer 8  
2
2
11  
1
1
1
4
4
110 Bolt M10×50  
111 Nut M10  
112 Washer 8  
1
1
1
1
134 Bolt M12×45  
135 Spring Washer 12  
136 Bolt M12  
4
4
2
1
113 Bolt M8×20  
114 Bottom Plate  
115 Nut M14  
137 Drain Valve  
116 Spring Washer 14  
1
For technical questions, please call 1-800-444 3353.  
Item 67853  
Page 18  
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Tank Assembly Diagram  
Item 67853  
For technical questions, please call 1-800-444 3353.  
Page 19  
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Limited 90 Day Warranty  
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability standards, and  
warrants to the original purchaser that this product is free from defects in materials and workmanship for the period of  
90 days from the date of purchase. This warranty does not apply to damage due directly or indirectly, to misuse, abuse,  
negligence or accidents, repairs or alterations outside our facilities, criminal activity, improper installation, normal wear and  
tear, or to lack of maintenance. We shall in no event be liable for death, injuries to persons or property, or for incidental,  
contingent, special or consequential damages arising from the use of our product. Some states do not allow the exclusion  
or limitation of incidental or consequential damages, so the above limitation of exclusion may not apply to you. THIS  
WARRANTy IS ExPRESSLy IN LIEU OF ALL OTHER WARRANTIES, ExPRESS OR IMPLIED, INCLUDING THE  
WARRANTIES OF MERCHANTABILITy AND FITNESS.  
To take advantage of this warranty, the product or part must be returned to us with transportation charges prepaid. Proof  
of purchase date and an explanation of the complaint must accompany the merchandise. If our inspection verifies the  
defect, we will either repair or replace the product at our election or we may elect to refund the purchase price if we cannot  
readily and quickly provide you with a replacement. We will return repaired products at our expense, but if we determine  
there is no defect, or that the defect resulted from causes not within the scope of our warranty, then you must bear the  
cost of returning the product.  
This warranty gives you specific legal rights and you may also have other rights which vary from state to state.  
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 444-3353  
For technical questions, please call 1-800-444 3353.  
Item 67853  
Page 20  
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Specifications  
Pump  
Two stage  
Air Outlet Size  
1/2”- NPT female  
Auto Shut-Off @ 180 PSI  
Restart @ 140 PSI  
Air Pressure  
Air Tank Capacity  
Air Flow Capacity  
Oil Capacity  
30 Gallons  
18 SCFM @ 90 PSI  
19.5 SCFM @ 40 PSI  
61 oz. (1.8L)  
SAE 30W non-detergent  
Air Compressor Oil  
(SKU 95048)  
Oil Type  
(Sold separately)  
Required Rotation  
viewed from PTO  
(power takeoff - the output shaft)  
Counterclockwise  
Required Engine Idle  
Speed  
2100 RPM ± 100 RPM  
Note: Engine specifications are found in the engine manual supplied with this equipment.  
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 444-3353  
www.harborfreight.com  
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212, 346 and 420 cc  
Horizontal Engines  
68120/68121 212cc Horizontal Engine  
68136 346cc Horizontal Engine  
68306 420cc Horizontal Engine  
Using an engine indoors CAN KILL YOU  
IN MINUTES.  
Engine exhaust contains carbon monoxide.  
This is a poison you cannot see or smell.  
Only use OUTSIDE  
NEVER use inside  
and far away from  
windows, doors,  
and vents.  
a home or garage,  
EVEN IF doors and  
windows are open.  
When unpacking, make sure that the product is intact and undamaged.  
If any parts are missing or broken, please call 1-800-520-0882 as soon as possible.  
Record Product’s Serial Number Here:  
(See Serial Number Location on page 6.)  
Note: If product has no serial number, record month and year of purchase instead.  
Note: Some parts are listed and shown for illustration purposes only, and are not available individually  
as replacement parts.  
Visit our website at: http://www.harborfreight.com  
Email our engine tech support at: [email protected]  
©
®
Copyright 2010 by Harbor Freight Tools . All rights reserved. No portion of this manual or any artwork contained herein may be reproduced in any shape  
or form without the express written consent of Harbor Freight Tools. Diagrams within this manual may not be drawn proportionally. Due to continuing  
improvements, actual product may differ slightly from the product described herein. Tools required for assembly and service may not be included.  
Manual Revised 11f  
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Specifications  
Description  
68120, 68121  
68136  
68306  
Displacement  
Engine Type  
212cc  
346cc  
420cc  
Horizontal Single Cylinder 4 stroke OHV  
Forced air cooled  
Cooling System  
Type  
87+ octane unleaded gasoline  
Fuel  
Capacity  
1 Gallon  
1 Gallon  
1 Gallon  
10W-30 above 32° F  
5W30 at 32° F or below  
Type SAE  
Capacity  
Engine Oil  
0.5 Quart  
1.16 Quart  
1.16 Quart  
Run Time @ 50% Load  
with full tank  
3 hr.  
Sound Level at 22 feet  
Bore x Stroke  
104 dB  
108 dB  
83 mm x 64 mm  
8.5:1  
108 dB  
70 mm x 55 mm  
90 mm x 66 mm  
Compression Ratio  
Rotation viewed from PTO  
Counterclockwise  
(power takeoff - the output shaft)  
Shaft  
3/4″ x 2.41″  
3/16″ (4.76 mm)  
5/16″ - 24 UNF  
1″ x 3.48″  
1/4″ (6.35 mm)  
3/8″ - 24  
1″ x 3.48″  
1/4″ (6.35 mm)  
3/8″ - 24  
Keyway  
Shaft  
End Tapped  
®
NGK BP-6ES  
®
®
®
®
NHSP / Torch F6TC  
NHSP / Torch F6TC  
Type  
®
®
NHSP / Torch F6TC  
Spark Plug  
Gap  
0.7 - 0.8 mm  
0.10 - 0.15 mm  
0.15 - 0.20 mm  
1,800 ± 50 RPM  
Intake  
Exhaust  
Idle  
Valve Clearance  
Speed  
For Engine technical questions, please call 1-800-520-0882.  
Page 2  
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Save This Manual  
Symbol Definitions  
Keep this manual for the safety warnings and precautions,  
assembly, operating, inspection, maintenance and  
cleaning procedures. Write the product’s serial  
number in the back of the manual near the assembly  
diagram (or month and year of purchase if product  
has no number). Keep this manual and the receipt  
in a safe and dry place for future reference.  
Symbol  
Property or Statement  
Revolutions Per Minute  
RPM  
Horsepower  
HP  
WARNING marking concerning Risk  
of Eye Injury. Wear ANSI-approved  
safety goggles with side shields.  
Safety Warnings  
Read the manual before set-up and/or use.  
In this manual, on the labeling, and all other  
information provided with this product:  
WARNING marking concerning Risk of  
Hearing Loss. Wear hearing protection.  
This is the safety alert symbol. It is  
used to alert you to potential personal  
injury hazards. Obey all safety  
messages that follow this symbol to  
avoid possible injury or death.  
WARNING marking concerning  
Risk of Respiratory Injury. Operate  
engine OUTSIDE and far away from  
windows, doors, and vents.  
WARNING marking concerning  
Risk of Fire while handling fuel. Do  
not smoke while handling fuel.  
DANGER indicates a hazardous situation which, if  
not avoided, will result in death or serious injury.  
WARNING marking concerning Risk of Fire.  
Do not refuel while operating.  
Keep flammable objects away from engine.  
WARNING indicates a hazardous situation which, if  
not avoided, could result in death or serious injury.  
WARNING! Read all instructions.  
Failure to follow all instructions listed below  
may result in fire, serious injury and/or DEATH.  
The warnings and precautions discussed in this  
manual cannot cover all possible conditions and  
situations that may occur. It must be understood  
by the operator that common sense and caution  
are factors which cannot be built into this  
CAUTION, used with the safety alert symbol,  
indicates a hazardous situation which, if not  
avoided, could result in minor or moderate injury.  
product, but must be supplied by the operator.  
NOTICE is used to address practices  
not related to personal injury.  
SAVE THESE INSTRUCTIONS  
CAUTION, without the safety alert symbol, is used  
to address practices not related to personal injury.  
For Engine technical questions, please call 1-800-520-0882.  
Horizontal Engines  
Page 3  
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6. Never store fuel or other flammable  
Set up Precautions  
materials near the engine.  
1. Gasoline fuel and fumes are flammable, and  
potentially explosive. Use proper fuel storage  
and handling procedures. Do not store fuel  
or other flammable materials nearby.  
7. Only use a suitable means of transport and  
lifting devices with sufficient weight bearing  
capacity when transporting the Engine.  
8. Secure the Engine on transport vehicles to prevent  
the tool from rolling, slipping, and tilting.  
2. Have multiple ABC class fire extinguishers nearby.  
3. Operation of this equipment may create sparks  
that can start fires around dry vegetation. A spark  
arrestor may be required. The operator should  
contact local fire agencies for laws or regulations  
relating to fire prevention requirements.  
9. Industrial applications must follow OSHA requirements.  
10. Do not leave the equipment unattended when it is  
running. Turn off the equipment (and remove safety  
keys, if available) before leaving the work area.  
4. Set up and use only on a flat, level,  
11. Engine can produce high noise levels. Prolonged  
exposure to noise levels above 85 dBA is hazardous  
to hearing. Always wear ear protection when operating  
or working around the gas engine while it is operating.  
well-ventilated surface.  
5. Wear ANSI-approved safety goggles, heavy-duty  
work gloves, and dust mask/respirator during set up.  
12. Wear ANSI-approved safety glasses, hearing  
protection, and NIOSH-approved dust mask/  
respirator under a full face shield along  
with steel-toed work boots during use.  
6. Use only lubricants and fuel recommended in  
the Specifications chart of this manual.  
Operating Precautions  
13. People with pacemakers should consult their  
physician(s) before use. Electromagnetic fields  
in close proximity to a heart pacemaker could  
cause pacemaker interference or pacemaker  
failure. Caution is necessary when near  
the engine’s magneto or recoil starter.  
1.  
CARBON MONOXIDE HAZARD  
Using an engine indoors CAN KILL  
YOU IN MINUTES.  
Engine exhaust contains carbon  
monoxide. This is a poison you cannot  
see or smell.  
14. Use only accessories that are recommended by Harbor  
Freight Tools for your model. Accessories that may  
be suitable for one piece of equipment may become  
hazardous when used on another piece of equipment.  
15. Do not operate in explosive atmospheres,  
such as in the presence of flammable  
liquids, gases, or dust. Gasoline-powered  
engines may ignite the dust or fumes.  
NEVER use inside a home or garage, EVEN IF doors  
and windows are open.  
16. Stay alert, watch what you are doing and use common  
sense when operating this piece of equipment. Do  
not use this piece of equipment while tired or under  
the influence of drugs, alcohol or medication.  
17. Do not overreach. Keep proper footing and  
balance at all times. This enables better control  
of the equipment in unexpected situations.  
18. Use this equipment with both hands  
only. Using equipment with only one hand  
can easily result in loss of control.  
Only use OUTSIDE and far away from windows, doors,  
and vents.  
2. Keep children away from the equipment,  
especially while it is operating.  
19. Dress properly. Do not wear loose clothing or  
jewelry. Keep hair, clothing and gloves away  
from moving parts. Loose clothes, jewelry or  
long hair can be caught in moving parts.  
3. Keep all spectators at least six feet from  
the Engine during operation.  
4. Fire Hazard! Do not fill gas tank while engine is  
running. Do not operate if gasoline has been spilled.  
Clean spilled gasoline before starting engine.  
Do not operate near pilot light or open flame.  
20. Parts, especially exhaust system components, get  
very hot during use. Stay clear of hot parts.  
21. Do not cover the engine or equipment during operation.  
22. Keep the equipment, engine, and  
surrounding area clean at all times.  
5. Do not touch engine during use. Let  
engine cool down after use.  
For Engine technical questions, please call 1-800-520-0882.  
Page 4  
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23. Use the equipment, accessories, etc., in accordance  
with these instructions and in the manner intended for  
the particular type of equipment, taking into account  
the working conditions and the work to be performed.  
Use of the equipment for operations different from  
those intended could result in a hazardous situation.  
4. Wear ANSI-approved safety goggles, heavy-duty work  
gloves, and dust mask/respirator during service.  
5. Maintain labels and nameplates on the  
equipment. These carry important information.  
If unreadable or missing, contact Harbor  
Freight Tools for a replacement.  
24. Do not operate the equipment with known  
leaks in the engine’s fuel system.  
6. Have the equipment serviced by a qualified repair  
person using only identical replacement parts.  
This will ensure that the safety of the equipment  
is maintained. Do not attempt any service or  
maintenance procedures not explained in this  
manual or any procedures that you are uncertain  
about your ability to perform safely or correctly.  
25. This product contains or, when used, produces a  
chemical known to the State of California to cause  
cancer and birth defects or other reproductive harm.  
(California Health & Safety Code § 25249.5, et seq.)  
26. When spills of fuel or oil occur, they must be  
cleaned up immediately. Dispose of fluids and  
cleaning materials as per any local, state, or  
federal codes and regulations. Store oil rags in  
a bottom-ventilated, covered, metal container.  
7. Store equipment out of the reach of children.  
8. Follow scheduled engine and equipment maintenance.  
Refueling:  
27. Keep hands and feet away from moving parts. Do  
not reach over or across equipment while operating.  
1. Do not smoke, or allow sparks, flames,  
or other sources of ignition around the  
equipment, especially when refuelling.  
28. Before use, check for misalignment or binding  
of moving parts, breakage of parts, and any  
other condition that may affect the equipment’s  
operation. If damaged, have the equipment  
serviced before using. Many accidents are  
caused by poorly maintained equipment.  
2. Do not refill the fuel tank while the  
engine is running or hot.  
3. TO PREVENT FUEL LEAKAGE AND FIRE  
HAZARD, do not fill fuel above the bottom of  
fuel strainer for the 68121, 212cc engine.  
29. Use the correct equipment for the application. Do  
not modify the equipment and do not use the  
equipment for a purpose for which it is not intended.  
Service Precautions  
1. Before service, maintenance, or cleaning:  
a. Turn the engine switch to its “OFF” position.  
b. Allow the engine to completely cool.  
68121 Max Fuel  
DO NOT OVERFILL!  
c. Then, remove the spark plug  
cap from the spark plug.  
4. Do not fill fuel tank to the top. Leave a little  
2. Keep all safety guards in place and in  
proper working order. Safety guards include  
muffler, air cleaner, mechanical guards, and  
heat shields, among other guards.  
room for the fuel to expand as needed.  
5. Refuel in a well-ventilated area only.  
6. Wipe up any spilled fuel and allow excess to evaporate  
before starting engine. To prevent FIRE, do not start  
the engine while the smell of fuel hangs in the air.  
3. Do not alter or adjust any part of the equipment  
or its engine that is sealed by the manufacturer  
or distributor. Only a qualified service  
SAVE THESE  
INSTRUCTIONS.  
technician may adjust parts that may increase  
or decrease governed engine speed.  
For Engine technical questions, please call 1-800-520-0882.  
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Engine Controls  
Fuel Cap  
Air Filter  
Engine  
Switch  
(Electric  
Start Models)  
Starter  
Handle  
Muffler  
Oil Drain Plug  
Dipstick  
Throttle  
Starter  
Choke  
Serial  
Number  
Fuel Valve  
Location  
(Write on front  
cover of manual.)  
Engine  
Switch  
(Manual Start  
Models)  
For Engine technical questions, please call 1-800-520-0882.  
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Battery Setup Instructions  
1. Place a fully charged, lead-acid 12 V, 36+ Ah battery  
Set Up  
(not included) in a stable, flat location near the engine.  
Model 68120: The emission control system for this  
engine is warranted for standards set by the U.S.  
Environmental Protection Agency. For warranty  
information, refer to the last pages of this manual.  
2. Only use cables sized to match their length  
according to the following chart:  
Cable Gauge  
Maximum  
Models 68306, 68121, and 68136: The emission  
control system for this Generator’s Engine is warranted  
for standards set by the U.S. Environmental Protection  
Agency and by the California Air Resources Board  
(also known as CARB). For warranty information,  
refer to the last pages of this manual.  
(lower gauge numbers  
Cable Length  
mean thicker cables)  
6
4
2
5′  
7′  
12′  
Read the ENTIRE IMPORTANT SAFETY  
INFORMATION section at the beginning  
of this manual including all text  
under subheadings therein before  
set up or use of this product.  
Motor Starter Assembly  
Starting Relay  
TO PREVENT SERIOUS INJURY:  
Operate only with proper spark arrestor installed.  
Operation of this equipment may create sparks that  
can start fires around dry vegetation.  
A spark arrestor may be required.  
The operator should contact local fire agencies for laws  
or regulations relating to fire prevention requirements.  
At high altitudes, the engine’s carburetor, governor (if so  
equipped), and any other parts that control the fuel-air  
ratio will need to be adjusted by a qualified mechanic to  
allow efficient high-altitude use and to prevent damage to  
the engine and any other devices used with this product.  
3. Attach the positive cable from the positive  
battery terminal to the Positive Terminal on the  
starter, shown above. Connect cable securely  
to prevent disconnection and short circuits.  
4. Attach the negative cable to the  
negative battery terminal.  
WARNING! DO NOT INSTALL THIS  
ENGINE ON A VEHICLE.  
5. Connect the negative cable securely to  
one of the engine mounting bolts.  
For Engine technical questions, please call 1-800-520-0882.  
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Checking and Filling Fuel  
WARNING! TO PREVENT SERIOUS  
Operation  
INJURY FROM FIRE:  
Read the ENTIRE IMPORTANT SAFETY  
Fill the fuel tank in a well-ventilated area away  
from ignition sources. If the engine is hot from  
use, shut the engine off and wait for it to cool  
before adding fuel. Do not smoke.  
INFORMATION section at the beginning  
of this manual including all text  
under subheadings therein before  
set up or use of this product.  
1. Clean the Fuel Cap and the area around it.  
2. Unscrew and remove the Fuel Cap.  
Pre-Start Checks  
3. If needed, fill the Fuel Tank to about 1 inch  
under the fill neck of the Fuel Tank with 87  
octane or higher unleaded gasoline.  
Inspect engine and equipment looking for  
damaged, loose, and missing parts before set  
up and starting. If any problems are found, do  
not use equipment until fixed properly.  
Note: Do not use gasoline containing more than  
10% ethanol (E10). Do not use E85 ethanol.  
Checking and Filling Engine Oil  
Note: Do not use gasoline that has been stored in  
a metal fuel container or a dirty fuel container. It  
can cause particles to enter the carburetor, affecting  
engine performance and/or causing damage.  
CAUTION! Your Warranty is VOID if the engine’s  
crankcase is not properly filled with oil before  
each use. Before each use, check the oil level.  
Do not run the engine with low or no engine  
oil. Running the engine with no or low engine  
oil WILL permanently damage the engine.  
4. Then replace the Fuel Cap.  
5. Wipe up any spilled fuel and allow excess to evaporate  
before starting engine. To prevent FIRE, do not start  
the engine while the smell of fuel hangs in the air.  
1. Make sure the engine is stopped and is level.  
2. Close the Fuel Valve.  
3. Clean the top of the Dipstick and the area around it.  
Remove the Dipstick by threading it counterclockwise,  
and wipe it off with a clean lint free rag.  
Starting the Engine  
Before Starting the Engine  
Before starting the engine:  
a. Follow the Set Up Instructions  
in the equipment manual to  
prepare the equipment.  
Full level  
Full level  
b. Inspect the equipment and engine.  
c. Fill the engine with the proper amount  
and type of both fuel and oil.  
4. Reinsert the Dipstick without threading it in and  
remove it to check the oil level. The oil level  
should be up to the full level as shown above.  
d. Read the Equipment Operation  
section in the equipment manual.  
5. If the oil level is at or below the low mark add the  
appropriate type of oil until the oil level is at the  
proper level. SAE 10W-30 oil is recommended  
for general use. (The SAE Viscosity Grade chart  
on page 14 in the Service section shows other  
viscosities to use in different average temperatures.)  
6. Thread the dipstick back in clockwise.  
CAUTION! Do not run the engine with too little  
oil. The engine will be permanently damaged.  
For Engine technical questions, please call 1-800-520-0882.  
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Manual Start  
1. To start a cold engine, move the Choke to the  
CHOKE position.  
1
2
3
To restart a warm engine, leave the Choke in the  
RUN position.  
CHOKE  
RUN  
2. Open the Fuel Valve.  
3. Slide the Throttle or Speed Control Lever to 1/3  
away from the SLOW position (the “turtle”).  
Note: Some tools have a Speed Control Lever located  
elsewhere on the tool which functions the same as the Throttle.  
Use the Speed Control Lever in place of the Throttle when the  
tool is so equipped.  
ON  
O
I
ON  
OFF  
4. Turn the Engine Switch on.  
4
5
5. Grip the Starter Handle of the Engine loosely and pull  
it slowly several times to allow the gasoline to flow into  
the Engine’s carburetor. Then pull the Starter Handle  
gently until resistance is felt. Allow Cable to retract fully  
and then pull it quickly. Repeat until the engine starts.  
Note: Do not let the Starter Handle snap back against the  
engine. Hold it as it recoils so it doesn't hit the engine.  
For Engine technical questions, please call 1-800-520-0882.  
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6. Allow the Engine to run for several seconds. Then,  
if the Choke lever is in the CHOKE position, move  
the Choke Lever very slowly to its RUN position.  
6
NOTE: Moving the Choke Lever too fast could stall the engine.  
CHOKE  
RUN  
IMPORTANT: Allow the engine to run at no load for five minutes with no  
load after each start-up so that the engine can stabilize.  
7. Adjust the Throttle as needed.  
8. Break-in Period:  
a. Breaking-in the engine will help to ensure proper equipment and engine operation.  
b. The operational break-in period will last about 3 hours of use. During this period:  
• Do not apply a heavy load to the equipment.  
• Do not operate the engine at its maximum speed.  
c. The maintenance break-in period will last about 20 hours of use. After this period:  
• Change the engine oil.  
Under normal operating conditions subsequent maintenance follows the schedule  
explained in the MAINTENANCE AND SERVICING section.  
Stopping the Engine  
OFF O  
I
1. To stop the engine in an emergency,  
turn the Engine Switch off.  
2. Under normal conditions, use the following procedure:  
a. Slide the Throttle or Speed Control  
Lever to SLOW (the “turtle”).  
b. Turn the Engine Switch off.  
c. Close the Fuel Valve.  
For Engine technical questions, please call 1-800-520-0882.  
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Electric Start (if equipped)  
1. To start a cold engine, move the Choke to the  
CHOKE position.  
1
To restart a warm engine, leave the Choke in the  
RUN position.  
CHOKE  
RUN  
2. Open the Fuel Valve.  
2
3. Slide the Throttle or Speed Control Lever to 1/3  
away from the SLOW position (the “turtle”).  
Note: Some tools have a Speed Control Lever located  
elsewhere on the tool which functions the same as  
the Throttle. Use the Speed Control Lever in place  
of the Throttle when the tool is so equipped.  
3
ON  
4. Turn the Engine Switch to START.  
OFF  
START  
4
START  
For Engine technical questions, please call 1-800-520-0882.  
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5. Allow the Engine to run for several seconds. Then,  
if the Choke lever is in the CHOKE position, move  
the Choke Lever very slowly to its RUN position.  
5
NOTE: Moving the Choke Lever too fast could stall the engine.  
CHOKE  
RUN  
IMPORTANT: Allow the engine to run at no load for five minutes with no  
load after each start-up so that the engine can stabilize.  
6. Adjust the Throttle as needed.  
7. Break-in Period:  
a. Breaking-in the engine will help to ensure proper equipment and engine operation.  
b. The operational break-in period will last about 3 hours of use. During this period:  
• Do not apply a heavy load to the equipment.  
• Do not operate the engine at its maximum speed.  
c. The maintenance break-in period will last about 20 hours of use. After this period:  
• Change the engine oil.  
Under normal operating conditions subsequent maintenance follows the schedule  
explained in the MAINTENANCE AND SERVICING section.  
Stopping the Engine  
OFF  
1. To stop the engine in an emergency,  
turn the Engine Switch off.  
2. Under normal conditions, use the following procedure:  
a. Slide the Throttle or Speed Control  
Lever to SLOW (the “turtle”).  
b. Turn the Engine Switch off.  
c. Close the Fuel Valve.  
For Engine technical questions, please call 1-800-520-0882.  
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Service  
WARNING  
TO PREVENT SERIOUS INJURY FROM ACCIDENTAL STARTING:  
Turn the Power Switch of the equipment to its “OFF” position, wait for the engine to cool, and disconnect  
the spark plug cap before performing any inspection, maintenance, or cleaning procedures.  
TO PREVENT SERIOUS INJURY FROM EQUIPMENT FAILURE:  
Do not use damaged equipment. If abnormal noise, vibration, or excess  
smoking occurs, have the problem corrected before further use.  
Follow all service instructions in this manual. The engine may fail critically if not serviced properly.  
Many maintenance procedures, including any not detailed in this manual, will need to be  
performed by a qualified technician for safety. If you have any doubts about your ability to safely  
service the equipment or engine, have a qualified technician service the equipment instead.  
Cleaning, Maintenance, and Lubrication Schedule  
Note: This maintenance schedule is intended solely as a general guide. If performance decreases or if  
equipment operates unusually, check systems immediately. The maintenance needs of each piece of equipment  
will differ depending on factors such as duty cycle, temperature, air quality, fuel quality, and other factors.  
Note: The following procedures are in addition to the regular checks and maintenance  
explained as part of the regular operation of the engine and equipment.  
Monthly or  
every 20  
hr. of use  
Yearly or  
every 300  
hr. of use  
Before  
Each Use  
Every 3 mo. or Every 6 mo. or  
50 hr. of use 100 hr. of use  
Every  
2 Years  
Procedure  
Brush off outside of engine  
Check engine oil level  
Check air cleaner  
Check deposit cup  
Change engine oil  
Clean/replace air cleaner  
*
Check and clean spark plug  
1. Check/adjust idle speed  
2. Check/adjust valve clearance  
3. Clean fuel tank, strainer  
and carburetor  
**  
**  
**  
4. Clean carbon build-up from  
combustion chamber  
Replace fuel line if necessary  
*Service more frequently when used in dusty areas.  
**These items should be serviced by a qualified technician.  
For Engine technical questions, please call 1-800-520-0882.  
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Checking and Filling Fuel  
WARNING! TO PREVENT SERIOUS  
INJURY FROM FIRE:  
Fill the fuel tank in a well-ventilated area away  
from ignition sources. If the engine is hot from  
use, shut the engine off and wait for it to cool  
before adding fuel. Do not smoke.  
Full level  
Full level  
1. Clean the Fuel Cap and the area around it.  
7. Add the appropriate type of oil until the oil level is at  
the full level. SAE 10W-30 oil is recommended for  
general use.  
2. Unscrew and remove the Fuel Cap.  
3. If needed, fill the Fuel Tank to about 1 inch under  
the fill neck of the Fuel Tank with 87 octane or  
higher unleaded gasoline. For the 68121, fill to the  
bottom of the fuel strainer ONLY, see below.  
The SAE Viscosity Grade chart shows other  
viscosities to use in different average temperatures.  
SAE Viscosity Grades  
30  
10W-30  
5W-30  
68121 Max Fuel  
DO NOT OVERFILL!  
-20  
0
20  
40  
60  
80  
100°F  
WARNING! TO PREVENT FUEL LEAKAGE AND  
FIRE HAZARD, do not fill fuel above the bottom  
of fuel strainer for the 68121, 212cc engine.  
Average outdoor temperature  
8. Thread the dipstick back in clockwise.  
CAUTION! Do not run the engine with too little  
oil. The engine will be permanently damaged.  
Note: Do not use gasoline containing more than  
10% ethanol (E10). Do not use E85 ethanol.  
Note: Do not use gasoline that has been stored in  
a metal fuel container or a dirty fuel container. It  
can cause particles to enter the carburetor, affecting  
engine performance and/or causing damage.  
Air Filter Element Maintenance  
1. Remove the air filter cover and the air filter elements  
and check for dirt. Clean or replace as described below.  
2. Cleaning:  
4. Then replace the Fuel Cap.  
• For “paper” filter elements:  
5. Wipe up any spilled fuel and allow excess to evaporate  
before starting engine. To prevent FIRE, do not start  
the engine while the smell of fuel hangs in the air.  
To prevent injury from dust and debris, wear ANSI-  
approved safety goggles, NIOSH-approved dust  
mask/respirator, and heavy-duty work gloves. In  
a well-ventilated area away from bystanders, use  
pressurized air to blow dust out of the air filter.  
If this does not get the filter clean, replace it.  
Engine Oil Change  
CAUTION! Oil is very hot during operation and can  
cause burns. Wait for engine to cool before changing oil.  
• For foam filter elements:  
1. Make sure the engine is stopped and is level.  
2. Close the Fuel Valve.  
Wash the element in warm water and mild  
detergent several times. Rinse. Squeeze  
out excess water and allow it to dry  
completely. Soak the filter in lightweight oil  
briefly, then squeeze out the excess oil.  
3. Place a drain pan (not included) underneath  
the crankcase’s drain plug.  
4. Remove the drain plug and, if possible,  
tilt the crankcase slightly to help drain  
the oil out. Recycle used oil.  
3. Install the new filter or the cleaned filter.  
Secure the Air Cleaner Cover before use.  
5. Replace the drain plug and tighten it.  
6. Clean the top of the Dipstick and the area around it.  
Remove the Dipstick by threading it counterclockwise,  
and wipe it off with a clean lint free rag.  
For Engine technical questions, please call 1-800-520-0882.  
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Spark Plug Maintenance  
2. FUEL:  
WARNING! TO PREVENT SERIOUS  
INJURY FROM FIRE:  
Drain the fuel tank in a well-ventilated area  
away from ignition sources. If the engine is  
hot from use, shut the engine off and wait for it  
to cool before draining fuel. Do not smoke.  
Spark  
Plug  
Cap  
a. Place a funnel leading to a proper gasoline  
container below the carburetor.  
1. Disconnect spark plug cap from end of plug.  
Clean out debris from around spark plug.  
2. Using a spark plug wrench, remove the spark plug.  
Sediment Cup  
(some engines)  
3. Inspect the spark plug:  
If the electrode is oily, clean it using a clean, dry  
rag. If the electrode has deposits on it, polish it  
using emery paper. If the white insulator is cracked  
or chipped, the spark plug needs to be replaced.  
Drain Plug  
b. Remove the drain bolt from the bottom of the  
carburetor bowl and allow the fuel to drain.  
Recommended Spark Plugs  
c. Remove the small sediment cup next to the bowl  
and allow the fuel to drain from there as well.  
Brand  
68120, 68121 68136 68306  
®
d. Open the fuel valve. After all fuel has  
drained, reinstall the drain bolt and sediment  
cup (if equipped). Tighten securely.  
BP-6ES  
NGK  
® /  
®
F6TC  
F6TC  
F6TC  
NHSP TORCH  
NOTICE: Using an incorrect spark  
plug may damage the engine.  
3. LUBRICATION:  
4. When installing a new spark plug, adjust the  
plug’s gap to the specification on the Technical  
Specifications chart. Do not pry against the  
electrode, the spark plug can be damaged.  
a. Change engine oil.  
b. Clean out area around spark plug. Remove  
spark plug and pour one tablespoon of engine  
oil into cylinder through spark plug hole.  
5. Install the new spark plug or the cleaned spark plug  
into the engine. Gasket-style: Finger-tighten until the  
gasket contacts the cylinder head, then about 1/2-2/3  
turn more.  
c. Replace spark plug, but leave spark  
plug cap disconnected.  
d. Pull Starter Handle to distribute oil in cylinder.  
Stop after one or two revolutions when you  
feel the piston start the compression stroke  
(when you start to feel resistance).  
Non-gasket-style: Finger-tighten until the plug  
contacts the head, then about 1/16 turn more.  
NOTICE: Tighten the spark plug properly. If  
loose, the spark plug will cause the engine  
to overheat. If overtightened, the threads  
in the engine block will be damaged.  
4. BATTERY:  
Disconnect battery cables (if equipped).  
Recharge batteries monthly while in storage.  
5. STORAGE AREA:  
6. Apply dielectric spark plug boot protector  
(not included) to the end of the spark plug  
and reattach the wire securely.  
Cover and store in a dry, level, well-ventilated  
area out of reach of children. Storage area should  
also be away from ignition sources, such as  
water heaters, clothes dryers, and furnaces.  
Storage  
When the equipment is to remain idle for longer than  
20 days, prepare the engine for storage as follows:  
6. AFTER STORAGE:  
Before starting the engine after storage, keep  
in mind that untreated gasoline will deteriorate  
quickly. Drain the fuel tank and change to fresh  
fuel if untreated gasoline has been sitting for  
a month, if treated gasoline has been sitting  
beyond the fuel stabilizer’s recommended time  
period, or if the engine does not start.  
1. CLEANING:  
Wait for engine to cool, then clean engine with  
dry cloth. NOTICE: Do not clean using water.  
The water will gradually enter the engine and cause  
rust damage.  
Apply a thin coat of rust preventive oil to all metal parts.  
For Engine technical questions, please call 1-800-520-0882.  
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Troubleshooting  
Problem  
Possible Causes  
Probable Solutions  
Engine will not start FUEL RELATED:  
1. No fuel in tank or fuel valve closed.  
2. Choke not in CHOKE position, cold engine. 2. Move Choke to CHOKE position.  
FUEL RELATED:  
1. Fill fuel tank and open fuel valve.  
3. Gasoline with more than 10% ethanol  
used. (E15, E20, E85, etc.)  
3. Clean out ethanol rich gasoline from fuel  
system. Replace components damaged  
by ethanol. Use fresh 87+ octane  
unleaded gasoline only.  
Do not use gasoline with more than  
10% ethanol (E15, E20, E85, etc.).  
4. Low quality or deteriorated, old gasoline.  
4. Use fresh 87+ octane unleaded gasoline.  
Do not use gasoline with more than  
10% ethanol (E15, E20, E85, etc.).  
5. Carburetor not primed.  
6. Dirty fuel passageways.  
5. Pull on Starter Handle to prime.  
6. Clean out passageways using fuel additive.  
Heavy deposits may require further cleaning.  
7. Carburetor needle stuck. Fuel  
can be smelled in the air.  
7. Gently tap side of carburetor float  
chamber with screwdriver handle.  
8. Too much fuel in chamber. This can be  
caused by the carburetor needle sticking.  
8. Turn Choke to RUN position. Remove spark  
plug and pull the start handle several times  
to air out the chamber. Reinstall spark  
plug and set Choke to CHOKE position.  
9. Clogged Fuel Filter.  
9. Replace Fuel Filter.  
IGNITION (SPARK) RELATED:  
1. Spark plug cap not connected securely.  
2. Spark plug electrode wet or dirty.  
3. Incorrect spark plug gap.  
IGNITION (SPARK) RELATED:  
1. Connect spark plug cap properly.  
2. Clean spark plug.  
3. Correct spark plug gap.  
4. Replace spark plug cap.  
4. Spark plug cap broken.  
5. Circuit breaker tripped (electric  
start models only).  
5. Reset circuit breaker. Check wiring and  
starter motor if breaker continues to trip.  
6. Incorrect spark timing or  
faulty ignition system.  
6. Have qualified technician diagnose/  
repair ignition system.  
COMPRESSION RELATED:  
COMPRESSION RELATED:  
1. Cylinder not lubricated. Problem after long 1. Pour tablespoon of oil into spark  
storage periods.  
plug hole. Crank engine a few  
times and try to start again.  
2. Loose or broken spark plug. (Hissing  
noise will occur when trying to start.)  
2. Tighten spark plug. If that does not work,  
replace spark plug. If problem persists,  
may have head gasket problem, see #3.  
3. Loose cylinder head or damaged  
head gasket. (Hissing noise will  
occur when trying to start.)  
3. Tighten head. If that does not remedy  
problem, replace head gasket.  
4. Engine valves or tappets  
mis-adjusted or stuck.  
4. Have qualified technician diagnose/  
repair ignition system.  
Follow all safety precautions whenever diagnosing or servicing the equipment or engine.  
For Engine technical questions, please call 1-800-520-0882.  
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Problem  
Possible Causes  
Probable Solutions  
Engine misfires  
1. Spark plug cap loose.  
1. Check wire connections.  
2. Incorrect spark plug gap or  
damaged spark plug.  
2. Re-gap or replace spark plug.  
3. Defective spark plug cap.  
4. Old or low quality gasoline.  
3. Replace spark plug cap.  
4. Use only fresh 87+ octane unleaded gasoline.  
Do not use gasoline with more than  
10% ethanol (E15, E20, E85, etc.).  
5. Incorrect compression.  
1. Low oil shutdown.  
5. Diagnose and repair compression.  
(Use Engine will not start:  
COMPRESSION RELATED section.)  
Engine stops  
suddenly  
1. Fill engine oil to proper level. Check  
engine oil before EVERY use.  
2. Fuel tank empty or full of impure or low  
quality gasoline.  
2. Fill fuel tank with fresh 87+ octane  
unleaded gasoline.  
Do not use gasoline with more than  
10% ethanol (E15, E20, E85, etc.).  
3. Defective fuel tank cap creating  
3. Test/replace fuel tank cap.  
vacuum, preventing proper fuel flow.  
4. Faulty magneto.  
4. Have qualified technician service magneto.  
5. Disconnected or improperly  
connected spark plug cap.  
5. Secure spark plug cap.  
Engine stops when 1. Dirty air filter  
1. Clean or replace element.  
under heavy load  
2. Engine running cold.  
2. Allow engine to warm up prior  
to operating equipment.  
Engine knocks  
1. Old or low quality gasoline.  
1. Fill fuel tank with fresh 87+ octane  
unleaded gasoline.  
Do not use gasoline with more than  
10% ethanol (E15, E20, E85, etc.).  
2. Engine overloaded.  
2. Do not exceed equipment’s load rating.  
3. Incorrect spark timing, deposit  
buildup, worn engine, or other  
mechanical problems.  
3. Have qualified technician diagnose  
and service engine.  
Engine backfires  
1. Impure or low quality gasoline.  
1. Fill fuel tank with fresh 87+ octane  
unleaded gasoline.  
Do not use gasoline with more than  
10% ethanol (E15, E20, E85, etc.).  
2. Engine too cold.  
2. Use cold weather fuel and oil  
additives to prevent backfiring.  
3. Intake valve stuck or overheated engine.  
4. Incorrect timing.  
3. Have qualified technician diagnose  
and service engine.  
4. Check engine timing.  
Follow all safety precautions whenever diagnosing or servicing the equipment or engine.  
For Engine technical questions, please call 1-800-520-0882.  
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Emission Control System  
Warranty  
Warranties  
United States Emission Control Defects  
Warranty Statement  
Limited 90 Day Warranty  
(for Model 68120)  
Harbor Freight Tools Co. makes every effort to assure that  
its products meet high quality and durability standards,  
and warrants to the original purchaser that this product  
is free from defects in materials and workmanship for  
the period of 90 days from the date of purchase. This  
warranty does not apply to damage due directly or  
indirectly, to misuse, abuse, negligence or accidents,  
repairs or alterations outside our facilities, criminal activity,  
improper installation, normal wear and tear, or to lack of  
maintenance. We shall in no event be liable for death,  
injuries to persons or property, or for incidental, contingent,  
special or consequential damages arising from the use  
of our product. Some states do not allow the exclusion or  
limitation of incidental or consequential damages, so the  
above limitation of exclusion may not apply to you. THIS  
WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER  
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE  
WARRANTIES OF MERCHANTABILITY AND FITNESS.  
The United States Environmental Protection Agency (herein EPA)  
and Harbor Freight Tools (herein HFT) are pleased to explain the emission  
control system warranty on your 1997 and later Small Off-Road Engine  
(herein engine). Within the United States, new off-road, spark-ignition  
engines certified for model year 1997 and later, must be designed, built  
and equipped to meet the stringent anti-smog standards set forth by the  
EPA. HFT must warrant the emission control system on your engine for  
the periods of time described below, provided there has been no abuse,  
neglect or improper maintenance of your engine.  
Your emission control system may include parts such as the  
carburetor or fuel-injection system, and the ignition system. Also included  
may be hoses, belts, connectors and other emission-related assemblies.  
Where a warrantable condition exists, HFT will repair your engine at  
no cost to you including diagnosis, parts and labor.  
California and United States Emission Control Defects  
Warranty Statement  
(for Models 68306, 68121, and 68136)  
The California Air Resources Board (herein CARB), the United  
States Environmental Protection Agency (herein EPA), and Harbor Freight  
Tools (herein HFT) are pleased to explain the emission control system  
warranty on your 1995 and later Small Off-Road Engine (herein engine).  
In California, the engine must be designed, built and equipped to meet  
the State’s stringent anti-smog standards. Elsewhere within the United  
States, new off-road, spark-ignition engines certified for model year 1997  
and later, must meet similar standards set forth by the EPA. HFT must  
warrant the emission control system on your engine for the periods of time  
described below, provided there has been no abuse, neglect or improper  
maintenance of your engine.  
To take advantage of this warranty, the product or part must  
be returned to us with transportation charges prepaid. Proof  
of purchase date and an explanation of the complaint must  
accompany the merchandise. If our inspection verifies the  
defect, we will either repair or replace the product at our  
election or we may elect to refund the purchase price if we  
cannot readily and quickly provide you with a replacement.  
We will return repaired products at our expense, but if we  
determine there is no defect, or that the defect resulted  
from causes not within the scope of our warranty, then you  
must bear the cost of returning the product.  
Your emission control system may include parts such as the  
carburetor or fuel-injection system, and the ignition system. Also included  
may be hoses, belts, connectors and other emission-related assemblies.  
Where a warrantable condition exists, HFT will repair your engine at  
no cost to you including diagnosis, parts and labor.  
This warranty gives you specific legal rights and you may  
also have other rights which vary from state to state.  
Manufacturer’s Warranty Coverage  
The 1995 and later engines are warranted for two (2) years. If any  
emission-related part on your engine is defective, the part will be repaired  
or replaced by HFT.  
3491 Mission Oaks Blvd. • PO Box 6009  
Camarillo, CA 93011 • (800) 520-0882  
For Engine technical questions, please call 1-800-520-0882.  
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4. Coverage Exclusions  
Harbor Freight Tools Emission Control Defects  
Warranty Coverage  
Warranty claims shall be filed in accordance with the provisions of the  
HFT warranty policy explained in the box at the top of the previous  
page. HFT shall not be liable for any loss of use of the engine, for  
any alternative usage, for any damage to goods, loss of time, or  
inconvenience. Warranty coverage shall also be excluded for any  
part which fails, malfunctions, or is damaged due to failure to follow  
the maintenance and operating instructions set forth in the Owner’s  
Manual including, but not limited to:  
Engines are warranted for a period of two (2) years relative to  
emission control parts defects, subject to the provisions set forth below.  
If any emission related part on your engine is defective, the part will be  
repaired or replaced by HFT.  
Owner’s Warranty Responsibilities  
• As the engine owner, you are responsible for the performance  
of the required maintenance listed in your Owner’s Manual. HFT  
recommends that you retain all receipts covering maintenance on  
your engine, but HFT cannot deny warranty solely for the lack of  
receipts or for your failure to ensure the performance of all scheduled  
maintenance.  
a) Use of parts which are not authorized by HFT  
b) Improper installation, adjustment or repair of the engine or of any  
warranted part unless performed by an authorized warranty center  
c) Failure to follow recommendations on fuel use contained in the  
Owner’s Manual  
• As the engine owner, you should, however, be aware that HFT may  
deny you warranty coverage if your engine or a part has failed due to  
abuse, neglect, improper maintenance, or unapproved modifications.  
d) Improper or inadequate maintenance of any warranted parts  
e) Repairs performed outside of the authorized warranty  
service dealers  
• You are responsible for shipping your engine to a HFT warranty  
station as soon as a problem exists. Contact the HFT Customer  
Service department at the number below to make shipping  
arrangements. The warranty repairs should be completed in a  
reasonable amount of time, not to exceed 30 days.  
f)  
Alterations by changing, adding to or removing parts from  
the engine.  
5. Service and Maintenance  
Component parts which are not scheduled for replacement as  
required maintenance or are scheduled only for regular inspection  
to the effect of “repair or replace as necessary” are warranted for  
the warranty period. Any warranted part which is scheduled for  
replacement as required maintenance is warranted for the period  
of time up to the first scheduled replacement point for that part.  
Any replacement part, provided it is equivalent in durability and  
performance, may be used in performance of maintenance or repairs.  
The owner is responsible for commissioning a qualified technician/  
mechanic to perform all required maintenance, as outlined in the  
Inspection, Cleaning, and Maintenance section in this manual.  
If you have any questions regarding your warranty rights and  
responsibilities, you should contact the Harbor Freight Tools Customer  
Service Department at 1-800-520-0882.  
Harbor Freight Tools Emission Control Defects  
Warranty Provisions  
1. Length of Coverage  
HFT warrants to a first retail purchaser and each subsequent  
purchaser that the engine is free from defects in materials and  
workmanship that cause the failure of warranted parts for a period of  
two (2) years after the date of delivery to the first retail purchaser.  
6. Warranted Parts  
1) Fuel Metering System  
2. No Charge Repair or Replacement  
i)  
Carburetor and its internal parts.  
Repair or replacement of any warranted part will be performed at  
no charge to the owner if the work is performed through a warranty  
station authorized by HFT. For emissions warranty service, contact  
the HFT Customer Service Department at 1-800-520-0882.  
ii) Fuel pump (if so equipped).  
iii) Cold start enrichment system.  
2) Air Induction System  
i)  
Intake pipe/manifold.  
3. Consequential Damages Coverage  
ii) Air cleaner.  
Coverage under this warranty shall also extend to the failure of any  
engine components caused by the failure of any warranted part while  
it is still covered under this warranty.  
3) Ignition System  
i)  
Spark plug.  
ii) Magneto ignition system.  
4) Catalyst System (if so equipped)  
i)  
Exhaust pipe stud.  
ii) Muffler.  
iii) Catalytic converter (if so equipped).  
5) Miscellaneous Items Used in Above Systems  
i)  
Vacuum, temperature and time sensitive valves and switches.  
ii) Hoses, belts, connectors, and assemblies.  
For Engine technical questions, please call 1-800-520-0882.  
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68120 212cc Parts List and Diagram  
Part  
Description  
Qty.  
1
1
1
1
4
1
1
2
2
4
1
1
1
1
1
1
2
2
1
1
1
1
2
1
1
1
1
2
1
1
6
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
2
Part  
Description  
Qty.  
2
2
2
2
1
3
1
1
1
1
1
2
1
1
1
4
1
1
1
1
1
2
1
1
1
2
1
1
1
1
1
2
1
1
2
1
1
1
1
2
1
1
2
1
1
1
1
1
1
1
2
3
4
5
6
7
8
9
Gasket, Cylinder Head  
51 Rocker, Valve  
Cover Asm., Cylinder Head  
Gasket, Cylinder Head Cover  
Tube, Breather  
52 Nut_ Valve Adjusting  
53 Nut, Valve Lock  
54 Spring, Valve  
55 Starter Asm., Recoil  
56 Bolt  
Bolt  
Stud  
Stud  
Stud  
Pin  
57 Shroud  
58 Shroud, Cylinder Body  
59 Shield,Lower  
60 Protector, Oil  
61 Switch Asm., Stop Engine  
62 Bolt  
63 Bolt  
64 Collar  
65 Bolt  
66 Bolt  
67 Carburetor Asm.  
68 Gasket, Air Cleaner  
69 Gasket, Carburetor  
70 Plate, Carburetor Insulator  
71 Gasket, Carburetor Insulator  
72 Nut  
73 Cleaner, Air  
74 Bolt  
75 Gasket, Exhaust Outlet  
76 Nut  
77 Muffler Asm.  
78 Tank, Fuel  
79 Strainer, Fuel  
80 Cover, Fuel Tank  
81 Outlet Asm., Fuel Tank Oil  
82 Collar  
10 Bolt, Cylinder Head  
11 Plug, Spark  
12 Head Asm., Cylinder  
13 Crankcase Asm.  
14 Sensor, Engine Oil  
15 Gear Asm., Governor  
16 Arm, Governor  
17 Bolt, Drain Plug  
18 Washer  
19 Bearing  
20 Seal, Oil  
21 Washer  
22 Pin  
23 Bolt  
24 Cover, Crankcase  
25 Bearing  
26 Seal, Oil  
27 Gasket, Crankcase  
28 Pin  
29 Dipstick Asm., Oil  
30 Plug Asm., Engine Oil  
31 Bolt  
32 Crankshaft Asm.  
33 Clip, Piston Pin  
34 Piston  
83 Tube, Fuel  
84 Bolt  
85 Nut  
35 Pin, Piston  
36 Rod, Connecting  
37 Ring, The First  
38 Ring, The Second  
39 Ring Set, Oil  
40 Camshaft Asm.  
41 Valve, Exhaust  
42 Valve, Intake  
43 Seat, Valve Spring  
44 Retainer_ Exhaust Valve  
45 Rotator, Valve  
46 Guide, Seal  
86 Nut, Flywheel  
87 Pulley,Starter  
88 Impeller  
89 Flywheel Asm.  
90 Bolt  
91 Coil, Ignition  
92 Control Asm., Throttle  
93 Bolt  
94 Spring, Governor  
95 Rod, Governor  
96 Spring, Throttle Valve Returning  
97 Bolt, Governor Support  
98 Nut  
47 Tappet, Valve  
48 Lifter, Valve  
49 Plate Asm., Lifter Stopper  
50 Bolt, Valve Adjusting  
99 Support Asm., Governor  
For Engine technical questions, please call 1-800-520-0882.  
Page 20  
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68120 212cc Parts List and Diagram  
For Engine technical questions, please call 1-800-520-0882.  
Horizontal Engines  
Page 21  
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68121 212cc Parts List and Diagram  
Part  
Description  
Qty.  
1
1
1
1
4
1
1
2
2
4
1
1
1
1
1
1
2
2
1
1
1
1
2
1
1
1
1
2
1
1
6
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
2
2
2
2
2
Part  
Description  
Qty.  
1
3
1
1
1
1
1
2
1
1
1
4
1
1
1
1
1
2
1
1
1
2
1
2
1
1
1
1
1
1
4
1
1
2
1
1
2
1
2
1
1
1
1
1
2
1
1
2
1
1
1
1
1
1
1
2
3
4
5
6
7
8
9
Gasket, Cylinder Head  
55 Starter Asm., Recoil  
Cover Asm., Cylinder Head  
Gasket, Cylinder Head Cover  
Tube, Breather  
56 Bolt  
57 Shroud  
58 Shroud, Cylinder Body  
59 Shield,Lower  
60 Protector, Oil  
61 Switch Asm., Stop Engine  
62 Bolt  
63 Bolt  
64 Collar  
65 Bolt  
66 Bolt  
67 Carburetor Asm.  
68 Gasket, Air Cleaner  
69 Gasket, Carburetor  
70 Plate, Carburetor Insulator  
71 Gasket, Carburetor Insulator  
72 Nut  
73 Cleaner, Air  
74 Bolt  
75 Gasket, Exhaust Outlet  
76 Nut  
77 Muffler Asm.  
78 Bolt  
79 Gasket, Auxiliary Air Valve Flange  
80 Valve, Muffler Auxiliary  
81 Tank, Fuel  
82 Strainer, Fuel  
83 Cap, Fuel  
84 Outlet Asm., Fuel Tank Oil  
85 Clamp  
86 Tube, Fuel  
87 Bolt  
88 Nut  
89 Vent, Vapor  
90 Hose, Vapor Rubber  
91 Band  
92 Collector, Vapor  
93 Clamp  
94 Hose, Air Cleaner Rubber  
95 Nut, Flywheel  
96 Pulley,Starter  
97 Impeller  
98 Flywheel Asm.  
99 Bolt  
100 Coil, Ignition  
101 Control Asm., Throttle  
102 Bolt  
103 Spring, Governor  
104 Rod, Governor  
105 Spring, Throttle Valve Returning  
106 Bolt, Governor Support  
107 Nut  
Bolt  
Stud  
Stud  
Stud  
Pin  
10 Bolt, Cylinder Head  
11 Plug, Spark  
12 Head Asm., Cylinder  
13 Crankcase Asm.  
14 Sensor, Engine Oil  
15 Gear Asm., Governor  
16 Arm, Governor  
17 Bolt, Drain Plug  
18 Washer  
19 Bearing  
20 Seal, Oil  
21 Washer  
22 Pin  
23 Bolt  
24 Cover, Crankcase  
25 Bearing  
26 Seal, Oil  
27 Gasket, Crankcase  
28 Pin  
29 Dipstick Asm., Oil  
30 Plug Asm., Engine Oil  
31 Bolt  
32 Crankshaft Asm.  
33 Clip, Piston Pin  
34 Piston  
35 Pin, Piston  
36 Rod, Connecting  
37 Ring, The First  
38 Ring, The Second  
39 Ring Set, Oil  
40 Camshaft Asm.  
41 Valve, Exhaust  
42 Valve, Intake  
43 Seat, Valve Spring  
44 Retainer_ Exhaust Valve  
45 Rotator, Valve  
46 Guide, Seal  
47 Tappet, Valve  
48 Lifter, Valve  
49 Plate Asm., Lifter Stopper  
50 Bolt, Valve Adjusting  
51 Rocker, Valve  
52 Nut_ Valve Adjusting  
53 Nut, Valve Lock  
54 Spring, Valve  
108 Support Asm., Governor  
For Engine technical questions, please call 1-800-520-0882.  
Page 22  
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68121 212cc Parts List and Diagram  
For Engine technical questions, please call 1-800-520-0882.  
Horizontal Engines  
Page 23  
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68136 346cc Parts List and Diagram  
Part  
Description  
Qty.  
1
1
1
1
1
2
2
2
4
1
1
1
1
1
1
1
1
1
2
2
1
1
1
1
4
2
1
1
1
1
1
1
2
7
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
2
2
Part  
Description  
Qty.  
1
2
2
2
2
2
1
1
3
1
1
1
5
1
1
1
1
1
2
1
1
3
1
2
1
1
1
2
1
1
1
1
5
1
1
2
1
1
1
1
2
1
1
1
1
1
2
1
1
2
1
1
1
1
1
1
1
2
3
4
5
6
7
8
9
Gasket, Cylinder Head  
57 Plate Asm., Lifter Stopper  
58 Bolt, Valve Adjusting  
59 Rocker, Valve  
60 Nut, Valve Adjusting  
61 Nut, Valve Lock  
62 Spring, Valve  
63 Retainer, Valve Spring  
64 Starter Asm., Recoil  
65 Bolt  
Cover Asm., Cylinder Head  
Gasket, Cylinder Head Cover  
Tube, Breather  
Bolt Asm., Cylinder Head Cover  
Stud  
Stud  
Pin  
Bolt, Cylinder Head  
10 Plug, Spark  
66 Shroud  
67 Shroud, Cylinder Body  
68 Bolt  
11 Head Asm., Cylinder  
12 Crankcase Asm.  
13 Seal, Oil  
14 Sensor, Engine Oil  
15 Frame, Fuel Tank Installation  
16 Plug, Rubber  
17 Protector, Oil  
18 Bolt  
19 Washer_ Flat  
20 Bolt, Drain Plug  
21 Clip  
22 Arm, Governor  
23 Seal, Oil  
24 Pin  
25 Bolt  
26 Bolt  
27 Washer_ Flat  
28 Bearing  
29 Cover, Crankcase  
30 Gasket, Crankcase  
31 Plug Asm., Engine Oil  
32 Dipstick Asm., Oil  
33 Pin  
34 Bolt  
35 Bearing  
36 Gear Asm., Governor  
37 Seal, Oil  
38 Bearing  
39 Crankshaft Asm.  
40 Shaft Asm., Balancing  
41 Ring Set, Oil  
42 Clip, Piston Pin  
43 Piston  
69 Bolt  
70 Carburetor Asm.  
71 Gasket, Air Cleaner  
72 Gasket, Carburetor  
73 Plate, Carburetor Insulator  
74 Gasket, Inlet  
75 Nut  
76 Cleaner, Air  
77 Bolt  
78 Nut  
79 Gasket, Exhaust Outlet  
80 Nut  
81 Muffler Asm.  
82 Gasket, Aux. Air Valve Flange  
83 Valve, Muffler Aux. Air  
84 Bolt  
85 Tank, Fuel  
86 Strainer, Fuel  
87 Cover, Fuel Tank  
88 Outlet Asm., Fuel Tank Oil  
89 Collar  
90 Tube, Fuel  
91 Clamp  
92 Nut  
93 Valve, One Way  
94 Hose, Fuel Steam Rubber  
95 Hose, Air Cleaner Rubber  
96 Collector, Fuel Steam  
97 Bolt  
98 Cover, Fuel Steam Collector  
99 Nut, Flywheel  
100 Pulley,Starter  
101 Impeller  
102 Flywheel Asm.  
103 Bolt  
104 Coil, Ignition  
105 Control Asm., Throttle  
106 Bolt  
107 Spring, Throttle Valve Returning  
108 Rod, Governor  
109 Support Asm., Governor  
110 Nut  
111 Bolt, Governor Support  
112 Spring, Governor  
44 Pin, Piston  
45 Rod, Connecting  
46 Ring, The First  
47 Ring, The Second  
48 Camshaft Asm.  
49 Valve, Exhaust  
50 Valve, Intake  
51 Seat, Valve Spring  
52 Retainer, Exhaust Valve  
53 Rotator, Valve  
54 Guide, Seal  
55 Tappet, Valve  
56 Lifter Asm., Valve  
For Engine technical questions, please call 1-800-520-0882.  
Page 24  
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68136 346cc Parts List and Diagram  
For Engine technical questions, please call 1-800-520-0882.  
Horizontal Engines  
Page 25  
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68306 420cc Parts List and Diagram  
Part  
1
2
3
4
5
6
7
8
Description  
Gasket, Cylinder Head  
Cover Asm., Cylinder Head  
Gasket, Cylinder Head Cover  
Tube, Breather  
Bolt Asm., Cylinder Head Cover  
Stud  
Qty.  
1
1
1
1
1
2
2
2
4
1
1
1
1
1
1
1
1
1
2
2
1
1
1
1
4
2
1
1
1
1
1
1
2
7
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
2
2
2
2
Part  
62  
63  
64  
65  
66  
67  
68  
69  
70  
71  
72  
73  
74  
75  
76  
77  
78  
79  
80  
81  
82  
83  
84  
85  
86  
87  
88  
89  
90  
91  
92  
93  
94  
95  
96  
97  
98  
99  
Description  
Spring, Valve  
Retainer, Valve Spring  
Starter Asm., Recoil  
Bolt  
Qty.  
2
1
1
4
1
1
1
5
1
2
1
1
1
2
1
1
3
1
2
1
1
1
2
1
1
1
1
5
1
1
2
1
1
1
1
2
1
1
1
1
1
1
1
1
2
1
2
1
2
1
1
1
1
1
1
1
2
1
2
1
2
Shroud  
Shroud, Cylinder Body  
Bolt  
Stud  
Pin  
Bolt  
9
Bolt, Cylinder Head  
Plug, Spark  
Head Asm., Cylinder  
Crankcase Asm.  
Seal, Oil  
Sensor, Engine Oil  
Frame, Fuel Tank  
Plug, Rubber  
Protector, Oil  
Carburetor Asm.  
Gasket, Air Cleaner  
Gasket, Carburetor  
Plate, Carburetor Insulator  
Gasket, Inlet  
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  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
Nut  
Cleaner, Air  
Bolt  
Nut  
Bolt  
Gasket, Exhaust Outlet  
Nut  
Muffler Asm.  
Gasket, Aux. Air Intake Valve  
Valve, Aux. Air Intake  
Bolt  
Washer_ Flat  
Bolt, Drain Plug  
Clip  
Arm, Governor  
Seal, Oil  
Pin  
Bolt  
Bolt  
Washer_ Flat  
Bearing  
Cover, Crankcase  
Gasket, Crankcase  
Plug Asm., Engine Oil  
Dipstick Asm., Oil  
Pin  
Bolt  
Bearing  
Gear Asm., Governor  
Seal, Oil  
Bearing  
Tank, Fuel  
Strainer, fuel  
Cover, Fuel Tank  
Outlet Asm., Fuel Tank Oil  
Collar  
Tube, Fuel  
Clip  
Nut  
Valve, One Way  
Hose, Fuel Steam Rubber  
Hose, Air Cleaner Rubber  
Collector, Fuel Steam  
Bolt  
Cover, Fuel Steam Collector  
Nut, Flywheel  
Crankshaft Asm.  
Shaft Asm., Balancing  
Ring Set, Oil  
Clip, Piston Pin  
Piston  
100 Pulley, Starter  
101 Impeller  
102 Flywheel Asm.  
103 Bolt  
104 Cap, Spark Plug  
105 Coil Asm., Charge  
106 Bolt  
107 Coil, Ignition  
108 Bolt  
109 Control Asm., Throttle  
110 Bolt  
111 Spring, Throttle Returning  
112 Rod, Governor  
113 Support Asm., Governor  
114 Nut  
115 Bolt, Governor Support  
116 Spring, Governor  
117 Motor Asm.,Starting  
118 Bolt  
119 Relay, Starting  
120 Bolt  
Pin, Piston  
Rod, Connecting  
Ring, The First  
Ring, The Second  
Camshaft Asm.  
Valve, Exhaust  
Valve, Intake  
Seat, Valve Spring  
Retainer, Exhaust Valve  
Rotator, Valve  
Guide, Seal  
Tappet, Valve  
Lifter Asm., Valve  
Plate Asm., Lifter Stopper  
Bolt, Valve Adjusting  
Rocker, Valve  
Nut, Valve Adjusting  
Nut, Valve Lock  
121 Switch,Control  
122 Bolt  
For Engine technical questions, please call 1-800-520-0882.  
Page 26  
Horizontal Engines  
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68306 420cc Parts List and Diagram  
For Engine technical questions, please call 1-800-520-0882.  
Horizontal Engines  
Page 27  
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Mounting Hole Diagrams  
Note: Not to scale.  
ITEM 68120 / 68121 212cc  
6.38 in. / 162mm  
2.6 in. / 66mm  
ITEM 68136 346cc and ITEM 68306 420cc  
7.72 in. / 196mm  
4.13 in. / 105mm  
For Engine technical questions, please call 1-800-520-0882.  
Page 28  
Horizontal Engines  
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Power Take-Off Diagrams  
Note: Not to scale.  
ITEM 68120 / 68121 212cc  
2.43 in. / 61.7mm  
5/16-24UNF  
1.79 in. / 45.5mm  
0.67 in.  
/ 17mm  
0.1875 in. / 4.78mm  
Ø0.75 in. / 19.05mm  
Ø3.625 in. / 92mm  
4x5/16-24UNF  
ITEM 68136 346cc and ITEM 68306 420cc  
Ø3.625 in. / 92mm  
(30°)  
3.48 in. / 88.5mm  
(30°)  
Ø6.5 in. / 165.1mm  
0.25 in. / 6.35mm  
Ø1 in. / 25.4mm  
Ø5.75 in.  
/ 146mm  
1.1 in. / 28mm  
2.2 in. / 56mm  
2.84 in. / 72.2mm  
Ø5 in. /  
127mm  
(45°)  
(45°)  
For Engine technical questions, please call 1-800-520-0882.  
Horizontal Engines  
Page 29  
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3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 520-0882  
www.harborfreight.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  

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