Harbor Freight FORTRESS 30 Gallon High Performance Gas Air User Manual

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30 GALLON

TRUCK BED AIR COMPRESSOR

Owner’s Manual & Safety Instructions

Save This Manual 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 (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. 23e

When unpacking, make sure that the product is intact

and undamaged. If any parts are missing or broken,

please call 1‑888‑866‑5797 as soon as possible.

2022 by Harbor Freight Tools

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.

read this material before using this product.

Failure to do so can result in serious injury.

SaVe tHiS ManUal.

HIGH PERFORMANCE

SERIES

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.

neVer use inside

a home or garage,

eVen iF doors and

windows are open.

Only use OUtSiDe

and far away from

windows, doors,

and vents.

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SaFety OperatiOn MaintenanceinStallatiOn

table of contents

Safety ........................................................................2

Installation .................................................................2

Specifications ............................................................6

Operation .................................................................. 13

Maintenance .............................................................17

Parts List and Diagram .............................................22

Warranty ...................................................................24

WarninG SyMBOlS anD DeFinitiOnS

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.

Indicates a hazardous situation which, if not avoided,

will result in death or serious injury.

Indicates a hazardous situation which, if not avoided,

could result in death or serious injury.

Indicates a hazardous situation which, if not avoided,

could result in minor or moderate injury.

Addresses practices not related to personal injury.

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SaFetyOperatiOnMaintenance inStallatiOn

iMpOrtant SaFety inFOrMatiOn

General Safety Warnings

WarninG read all safety warnings and instructions.

Failure to follow the warnings and instructions may result in electric shock, fire and/or serious injury.

Save all warnings and instructions for future reference.

The warnings, precautions, and instructions discussed in this instruction 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.

Set Up precautions

1. Keep work area clean and well lit.

Cluttered or dark areas invite accidents.

2. Do not operate the compressor

in explosive atmospheres, such

as in the presence of flammable

liquids, gases or dust. Gasoline‑powered

engines may ignite the dust or fumes.

3. Keep children and bystanders away

from an operating compressor.

4. 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.

5. Have multiple ABC class fire extinguishers nearby.

6. 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.

7. Set up and use only on a flat, level,

well‑ventilated surface.

8. Use only lubricants and fuel recommended

in the engine manual or in the

Specifications chart of this manual.

9. 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.

10. Do not overreach. Keep proper footing and

balance at all times. This enables better control

of the equipment in unexpected situations.

11. 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.

engine precautions

Follow engine precautions and instructions in the included engine instruction manual.

personal Safety

1. Stay alert, watch what you are doing and

use common sense when operating this

compressor. Do not use this compressor

while you are tired or under the influence

of drugs, alcohol or medication. A moment

of inattention while operating a compressor

may result in serious personal injury.

2. Use personal protective equipment.

always wear anSi-approved eye

protection during setup and use.

3. prevent unintentional starting.

ensure the switch is in the off-position

before moving the compressor.

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Operating precautions

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.

NEVER use inside a home or garage, EVEN IF

doors and windows are open.

Only use OUTSIDE and far away from windows,

doors, and vents.

2. Keep children away from the equipment,

especially while it is operating.

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.

a. Do not use the compressor if the switch

does not turn it on and off. Any compressor

that cannot be controlled with the switch

is dangerous and must be repaired.

b. Store an idle compressor out of the reach

of children and do not allow persons

unfamiliar with the compressor or these

instructions to operate it. A compressor is

dangerous in the hands of untrained users.

5. Never store fuel or other flammable

materials near the Compressor engine.

6. Only use a suitable means of transport and

lifting devices with sufficient weight bearing

capacity when transporting the Compressor.

7. Secure the Compressor on transport vehicles to

prevent the tool from rolling, slipping, and tilting.

8. 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.

9. Parts, especially exhaust system components,

get very hot during use. Stay clear of hot parts.

10. Do not cover the engine or

equipment during operation.

11. Maintain the compressor. Keep the compressor

clean for better and safer performance. Follow

instructions for lubricating and changing

accessories. Keep dry, clean and free from

oil and grease. check for misalignment or

binding of moving parts, breakage of parts

and any other condition that may affect the

compressor’s operation. if damaged, have the

compressor repaired before use. Many accidents

are caused by a poorly maintained compressor.

12. Use the compressor in accordance with these

instructions, taking into account the working

conditions and the work to be performed. Use of

the compressor for operations different from those

intended could result in a hazardous situation.

13. Do not operate the equipment with known

leaks in the engine’s fuel system.

14. 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.

15. Keep hands and feet away from moving parts. Do

not reach over or across equipment while operating.

16. 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.

17. 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.

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SaFetyOperatiOnMaintenance inStallatiOn

Service precautions

Have your compressor serviced by a qualified repair person using only identical

replacement parts. this will ensure that the safety of the compressor is maintained.

1. Before service, maintenance, or cleaning:

a. turn the engine switch to its “OFF” position.

b. allow the engine to completely cool.

c. then, remove the spark plug

cap from the 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.

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.

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.

6. Store equipment out of the reach of children.

7. Follow scheduled engine and

equipment maintenance.

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.

2. risk of bursting - do not adjust regulator higher

than marked maximum pressure of attachment.

3. risk of injury - do not direct air

stream at people or animals.

4. Do not use to supply breathing air.

5. Keep compressor well-ventilated.

Do not cover compressor during use.

6. 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.

7. Drain Tank daily and after use. Internal rust causes

tank failure and explosion.

8. Do not remove the valve cover or

adjust internal components.

9. Compressor head gets hot during operation.

Do not touch it or allow children nearby

during or immediately following operation.

10. Do not use the air hose to move the compressor.

11. Release the pressure in the

storage tank before moving.

12. The use of accessories or attachments not

recommended by the manufacturer may

result in a risk of injury to persons.

13. All air line components, including hoses, pipe,

connectors, filters, etc., must be rated for a minimum

working pressure of 175 PSI, or 150% of the

maximum system pressure, whichever is greater.

14. Industrial applications must follow OSHA guidelines.

15. Maintain labels and nameplates on the

compressor. These carry important safety

information. If unreadable or missing, contact

Harbor Freight Tools for a replacement.

16. This product is not a toy.

Keep it out of reach of children.

17. Operate unit on level surface. Check oil level

daily and fill to marked level if needed.

18. People with pacemakers should consult their

physician(s) before use. Electromagnetic

fields in close proximity to heart pacemaker

could cause pacemaker interference or

pacemaker failure. Caution is necessary when

near the engine’s magneto or recoil starter.

SaVe tHeSe inStrUctiOnS.

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Symbol Definitions

pSi

Pounds per square inch of pressure

cFM

Cubic Feet per Minute flow

ScFM

Cubic Feet per Minute flow

at standard conditions

npt

National pipe thread, tapered

npS

National pipe thread, straight

rpM

Revolutions Per Minute

Horsepower

WARNING marking concerning Risk

of Eye Injury. Wear ANSI‑approved

safety goggles with side shields.

WARNING marking concerning

Risk of Respiratory Injury.

Operate engine OUTSIDE and far

away from windows, doors, and vents.

WARNING marking concerning

Risk of Explosion.

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Specifications

Pump Two stage, V‑style

Air Outlet Size 1/2″ NPT(F)

Air Pressure

Shut‑off 175 PSI

Restart 145 PSI

Air Tank Capacity 30 Gallons

Air Flow Capacity

Up to 24 CFM @ 90 PSI

Up to 25 CFM @ 40 PSI

Pump Oil Capacity 28.7 oz. (0.85 L)

Oil Type

SAE 30 non‑detergent

Air Compressor Oil

Required Rotation

viewed from PTO

(power takeoff ‑ the output shaft)

Counterclockwise

Engine speed (non‑idle) 3250 ± 50 RPM

Note: Engine specifications are found in the engine manual supplied with this equipment.

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installation

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.

The emission control system for this Compressor’s Engine is warranted for standards set by the

U.S. Environmental Protection Agency. For warranty information, refer to the engine manual.

note: For additional information regarding the parts listed in the following pages,

refer to the Assembly Diagram near the end of this manual.

Functions

Oil Fill

plug

pump Safety

Valve

(not shown)

power

Switch

tank pressure

Gauge

air Outlet

Oil Sight

Glass

Oil Drain

Valve

air Filter

Belt Guard

Handle

pilot Valve

tank Safety

Valve

Hour Meter

Drain

Valve

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Belt Guard ‑ Encloses the pulleys and drive belts.

Protects the user from the moving parts and allows

the pulley to direct cooling air to the Air Pump.

Oil Sight Glass - Shows proper level of the oil.

Oil level should be at center of Sight Glass.

Oil

Sight

Glass

OVerFill

lOW

FUll

OIL LEVEL

Drain Valve - Allows moisture to be

removed from tank to prevent corrosion.

Safety Valve - Automatically releases air if

Air Tank pressure exceeds the preset maximum.

In an emergency, the ring can be pulled to

relieve tank air pressure. There is a Safety Valve

on the pump and another on the tank.

air tank - Air pressurized by the

Pump is stored for use.

tank pressure Gauge - Displays

the air pressure in the tank.

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

Open

pilot

Valve

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Mounting to truck Bed

1. Before mounting, if needed, reinforce the

area with plywood or steel plating.

2. Vibration isolation pads (sold separately) can be

added between the Compressor’s feet and mounting

surface to dampen the impact of vibration.

3. With assistance, move compressor to truck bed

location and mark the floor of 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 compressor aside.

4. Drill four 1/2″ diameter holes through truck bed

and any reinforcing materials. Set compressor

back in place, and align foot holes with the

pre‑drilled holes. Use four 1/2″ diameter

bolts, flat washers and lock washers (sold

separately) to secure compressor in place.

checking the Oil

1. Check the oil level before operation.

Fill the Pump Crankcase with

SAE 30W, non‑detergent,

Air Compressor Oil (sold separately).

iMpOrtant: running the air compressor

with no oil or low oil will cause damage to

the equipment and void the warranty.

2. The oil level should be at the center of the “full” level

on the Oil Sight Glass, as shown in the illustration.

Add oil as needed to maintain this level.

Do not let the oil level go below the center dot

(LOW as shown below) and do not overfill

the oil so that it is above the center dot

(OVERFILL as shown below).

OVerFill

lOW

FUll

3. To add oil:

a. Remove the Oil Fill Plug.

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 Fill Plug.

cold Weather Operation

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 L‑PAB100‑150 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.

4. If uncertain which oil to use for this compressor,

call Harbor Freight Tools customer service

at 1‑888‑866‑5797 for assistance.

5. change the compressor oil after the first

20 hours of use to remove any debris.

caUtiOn! tO preVent inJUry FrOM BUrnS:

Do not add or change the oil while

the compressor is in operation.

allow the compressor to cool before replacing oil.

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installing air Outlet Valve

1. Install the included ball valve onto end of tank for the

air outlet. Use thread sealer on the valve threads.

Breaking in the compressor

1. Turn Engine off.

2. Open ball valve on tank.

3. Check all fluid levels in engine and pump.

4. Start engine following the General

Operating Instructions.

5. Let the unit run for 30 minutes.

Air will expel freely through the Coupler.

6. Turn Engine OFF.

7. Close ball valve.

air connection Setup

1. Connect a regulator valve, an inline shut off valve

and a 1/2″ NPT air hose to the Quick Coupler

(all sold separately). 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.

2. Depending on the tool that will be used

with this compressor, incorporate additional

components, such as an in‑line oiler, a filter,

or a dryer (all sold separately), as shown

in Figure A on page 12. Consult air

tool’s manual for needed accessories.

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Figure a: portable air Supply Setup

Non-lubricated

Tools

Lubricated

Tools

Description Function

A Air Hose Connects air to tool

B Filter Prevents dirt and condensation from damaging tool or workpiece

C Regulator Adjusts air pressure to tool

D Lubricator (optional) For air tool lubrication

E Coupler and Plug Provides quick connection and release

F Leader Hose (optional) Increases coupler life

G Air Cleaner / Dryer (optional) Prevents water vapor from damaging workpiece

H Air Adjusting Valve (optional) For fine tuning airflow at tool

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Operating instructions

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. Close Drain Valve by turning handle so

that it is perpendicular to valve.

2. Close the in‑line Shutoff Valve between

compressor and air hose.

3. Open Pilot Valve by rotating it to vertical position.

4. Open Fuel Valve.

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5. To start a cold engine, move Choke to the START

(start/closed) position.

To restart a warm engine, leave Choke in the

RUN position.

If engine does not start, try choke half‑way

between RUN and START position.

6. For ManUal Start

a. Turn Engine Switch to ON.

OFF Start

b. Grip Starter Handle of Engine loosely and

pull it slowly several times to allow gasoline to

flow into Engine’s carburetor. Then pull 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

Starter Handle snap back against the engine.

Hold it as it recoils so it doesn’t hit the engine.

For electric Start

Place a fully charged, lead‑acid 12 volt, 300

cca, 36 ah battery (not included) in a stable,

flat location near the compressor; OR connect

compressor directly into vehicle system.

WarninG: Wiring into vehicle system should

be performed by a qualified technician.

a. Pull off cable boots from terminals on

front of compressor platform.

a. Attach positive cable from positive battery

terminal to Positive Terminal (+) on compressor.

Attach negative cable from negative terminal of

battery to Negative Terminal (–) on compressor.

Connect cables securely to prevent disconnection

and short circuits. Coat terminals and cable

ends with a corrosion‑preventive coating.

b. Reinstall cable boots.

c. Turn 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.

OFF Start

Start

note: If engine does not start, check engine oil. Engine

will not start with low or no engine oil.

7. Allow Engine to run for several seconds.

Then, if Choke lever is in START position, move

Choke Lever very slowly to its RUN position.

note: Moving the Choke Lever too fast could kill the engine.

RUNSTART

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8. Close Pilot Valve by rotating it to a horizontal position.

9. When the Gas Engine is started and running, the

compressor Pump starts compressing air into the Air

Tank. Open the in‑line Shut Off 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.

iMpOrtant: Allow 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.

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11. After the job is complete, turn OFF the engine.

To stop the engine in an emergency, turn Engine Switch off.

Under normal conditions, use the following procedure:

a. Turn Engine Switch off.

b. Close Fuel Valve.

12. Close the in‑line Shut Off Valve.

13. Bleed air from tool then disconnect tool.

14. Open Drain Valve at bottom of Tank, to release any

built‑up moisture and internal tank pressure.

15. Clean, then store the Air Compressor inside a garage or another area that provides protection from the elements.

emergency Depressurization

If it is necessary to quickly depressurize the Compressor, turn the Power Switch OFF.

Then pull the ring on the Safety Valve to quickly release stored air pressure.

OFF

OFF Start

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Maintenance and Servicing

procedures not specifically explained in this manual must

be performed only by a qualified technician.

tO preVent SeriOUS inJUry FrOM acciDental OperatiOn:

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.

tO preVent SeriOUS inJUry FrOM cOMpreSSOr FailUre:

Do not use damaged equipment. if abnormal noise or vibration occurs,

have the problem corrected before further use.

caUtiOn! tO preVent inJUry FrOM BUrnS: Do not add or change the oil while the

compressor is in operation. allow the compressor to cool before replacing oil.

cleaning, Maintenance, and lubrication

1. BeFOre eacH USe, inspect the general

condition of the air compressor. Check for:

• loose hardware,

• misalignment or binding of moving parts,

• damaged belts,

• cracked or broken parts,

• damaged electrical wiring, and

• any other condition that may

affect its safe operation.

2. aFter USe, wipe external surfaces of

the compressor with a clean cloth.

compressor pump Oil Maintenance

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, replace the oil more frequently.

change compressor oil after first 20

hours of use to remove any debris.

changing Oil

caUtiOn! tO preVent inJUry FrOM BUrnS: Do not add or change the oil while the

compressor is in operation. allow the compressor to cool before replacing oil.

1. Place a container under Oil Drain Plug.

2. Remove Oil Fill Plug to allow air flow into the Pump.

3. Remove Oil Drain Plug, allowing the

oil to drain into the container.

4. When the oil is completely drained from

the Pump, replace Oil Drain Plug.

5. Fill the Pump with new compressor oil to

the FULL level on Oil Sight Glass.

6. Replace and tighten Oil Fill Plug.

7. Discard old oil according to local,

state and federal regulations.

OVerFill

lOW

FUll

OIL LEVEL

Oil Drain

plug

Oil Sight

Glass

Oil Fll

plug

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SaFety OperatiOn MaintenanceinStallatiOn

Draining Moisture from the tank

The Drain Valve is located under the Tank.

It must be used daily to release all trapped air and

moisture from the Tank. Doing this will eliminate

condensation and prevent tank corrosion.

1. Turn Power Switch off.

2. Place a collection pan under Drain Valve.

3. Open Drain Valve by turning handle

parallel to drain axis.

4. When all the pressure and moisture is released,

close Drain Valve.

air Filter Maintenance

Check the Air Filter weekly to see if it needs cleaning or

replacement. If working in dirty environments, you may

need to replace filter more often. To replace Air Filter:

1. Unthread Wing Nut holding Air

Filter Assembly in place.

2. Remove cover and Air Filter.

3. Check Filter for accumulated dirt.

4. 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 (no more

than 15 PSI) to blow dust out of the Filter.

5. Replace the clean Filter, then replace the

Cover and secure with Wing Nut.

6. Install new Air Filter if it is too dirty to be cleaned.

adjusting Belt tension

1. Remove Belt Guard Cover and set it aside.

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″.

Deflection

Distance

3. if either belt deflects too much, tighten belts

by loosening the four Engine Mounting Bolts

and turning the Adjustment Screws clockwise

to shift engine away from other pulley. Turn

both Adjustment Screws an equal amount.

Retighten Engine Mounting Bolts and retest

tension. If either belt is too long to be properly

tensioned, both belts must be replaced.

engine Mounting Bolt

adjustment

Screws

4. if either belt deflects too little, loosen belts by

loosening the four Engine Mounting Bolts and

turning the Adjustment Screws counterclockwise to

shift the engine toward the other pulley. Turn both

Adjustment Screws an equal amount. Retighten

Engine Mounting Bolts and retest tension.

5. Replace belt cover before use.

Page 19For technical questions, please call 1-888-866-5797.Item 59373

SaFetyOperatiOnMaintenance inStallatiOn

Maintenance Schedule

Following are general guidelines for

maintenance checks of the Air Compressor.

note: The environment in which the compressor

is used, and the frequency of use will affect how

often you will need to check the Air Compressor

components and perform maintenance procedures.

Daily:

a. Check oil level.

b. Check for oil leaks.

c. Make sure all nuts and bolts are tight.

d. Drain moisture from air tank.

e. Check for abnormal noise or vibration.

f. Check for air leaks.

g. Inspect belts.

h. Wipe off any oil or dirt from the compressor.

Weekly:

a. Inspect Air Filter.

b. Inspect Oil Breather.

Monthly:

a. Inspect Pressure Relief Valve.

b. Inspect vibration isolation pads (if installed).

* To check for air leaks, apply soapy water to joints while

the Air Compressor is pressurized. Look for air bubbles.

** To clean the compressor surface, wipe with

a damp cloth, using a mild detergent or mild solvent.

Page 20 For technical questions, please call 1-888-866-5797. Item 59373

SaFety OperatiOn MaintenanceinStallatiOn

troubleshooting

problem possible causes likely Solutions

Engine will

not start

(Note: See engine

manual for engine

specific issues.)

COMPRESSOR SPECIFIC:

1. Pilot Valve closed.

2. Tank already pressurized.

COMPRESSOR SPECIFIC:

1. Open pilot valve before start procedure,

close after unit is running.

2. Turn engine on. Compressor will turn on as

needed when pressure reaches preset level.

Compressor

overheats

1. Incorrect lubrication or

not enough lubrication.

2. Worn parts.

1. Lubricate using recommended oil or

grease according to directions.

2. Have qualified technician inspect internal

mechanism and replace parts as needed.

Severe air

leakage

1. Poor air outlet seal.

2. Loose cylinder/cylinder head.

3. Damaged valve or housing.

4. Dirty, worn or damaged valve.

1. Tighten or re‑attach using thread seal tape.

2. Tighten cylinder/cylinder head assembly.

If cylinder/cylinder head cannot tighten properly,

internal parts may be misaligned.

3. Replace damaged components.

4. Clean or replace valve assembly.

Unit stalls

1. Low engine idle.

2. Severely clogged air filter.

3. Improper lubrication.

4. Defective pilot/unloader valve.

1. Qualified technician should increase idle to

2,000±100 RPM by adjusting pressure switch.

2. Replace air filter.

3. Check for proper oil level.

4. Replace pilot valve.

Excessive noise

1. Loose drive pulley or flywheel.

2. Misaligned pulleys.

3. Lack of oil in crankcase.

4. Worn connecting rod.

5. Worn wrist pin bushing.

6. Worn bearings.

7. Loose belts.

1. Loose pulleys are a common cause of

“knocking”. Tighten appropriate bolts.

2. Align pulleys with straightedge and secure in place.

3. Check for proper oil level.

4. Replace connecting rod.

5. Remove piston assembly and replace necessary parts.

6. Replace bearings and oil.

7. Check for proper belt tension.

Oil in the

discharge air

1. Wrong type of oil or

low‑quality oil.

2. Overheating.

3. Restricted intake air.

4. Worn piston rings.

5. Excessive moisture

in the tank.

1. Change oil. Check oil recommendations under

Maintenance section of this manual.

2. See above Excessive Noise section.

3. Clean or replace air filter.

4. Replace piston rings.

5. Drain moisture from the tank daily.

Low discharge

pressure

1. Air leaks.

2. Leaking valves.

3. Restricted air intake.

4. Blown gaskets.

5. Slipping belts.

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. 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.

3. Clean or replace air filter element.

4. Replace if gaskets proven faulty on inspection.

5. Tighten Belts (See Maintenance.)

Follow all safety precautions whenever diagnosing or servicing the equipment or engine.

Page 21For technical questions, please call 1-888-866-5797.Item 59373

SaFetyOperatiOnMaintenance inStallatiOn

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.

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. Specify UPC 193175467782 when ordering parts.

Page 22 For technical questions, please call 1-888-866-5797. Item 59373

SaFety OperatiOn MaintenanceinStallatiOn

parts list and Diagram

parts list

part Description Qty

1 Cylinder Head 1

2 Socket Head Bolt Set 4

3 Socket Head Bolt Set 1

4 Air Filter Set 1

5 Air Filter Element 1

6 Cylinder Head Gasket 1

7 Valve Assembly 1

8 Valve Seat Gasket 1

9 Double Head Screw Set 8

10 Cylinder 1

11 Cylinder Gasket 2

12 Piston Ring Set 1

13 Piston Set 1

14 Rod Set 1

15 Rod Bushing (2) 2

16 Crankcase 1

17 Oil Drain Plug 1

18 Front Bearing Seat Gasket 1

19 Oil Mesh 1

20 Front Bearing Seat 1

21 Hex Bolt 10

22 Oil Breather 1

23 Oil Sight Gauge Set 1

24 Oil Fill Plug 1

25 Bearing 2

26 Crankshaft & Balancer 1

27 Pulley Key 1

28 Rear Bearing Seat Gasket 1

29 Rear Bearing Seat 1

30 Oil Seal 1

31 Pulley 1

32 Plate Washer 1

33 Hex Bolt Set 1

34 Cylinder Head 1

35 Socket Head Bolt Set 4

36 Cylinder Head Gasket 1

37 Valve Assembly 1

38 Valve Seat Gasket 1

39 Cylinder 1

40 Piston Ring Set 1

41 Piston Set 1

42 Rod Set 1

43 Exhaust Elbow 1

44 Exhaust Tube Set 1

45 Safety Valve 1

46 Exhaust Elbow 1

47 Oil Drain Tube 1

part Description Qty

48 Exhaust Elbow 1

49 Air Tank 1

50 Elbow 2

51 Drain Valve 1

52 Shut Off Valve 1

53 Plug 1

54 Unloading Valve 1

55 Exhaust Tube 1

56 Elbow 1

57 Idling Tube 1

58 Idling Device 1

59 Three Way Pipe 1

60 Safety Valve 1

61 Elbow 1

62 Gauge Tube 1

63 Elbow 1

64 Pressure Gauge Set 1

65 Terminal Set 1

66 Pulley 1

67 Hex Bolt Set 1

68 V‑Belt 2

69 Belt Guard Set 1

70 Belt Guard Screw Set (9) 1

71 Belt Guard Bracket Set (3) 1

72 Body Bracket Set 1

73 Engine Bolt Set 1

74 Frame 1

75 Frame Cover Set 1

76 Gas Strut 2

77 Mandrel Bolt Set (2) 2

78 Frame Assembly 1

79 Oil Drain Tube Short 1

80 Oil Drain Tube Long 1

81 Engine Seat Plate 1

82 Adjusting Bracket 1

83 Fixed Bolt Set 2

84 Adjust Bolt Set 2

85 Body Bolt Set 1

86 Timer Seat Set 1

87 Frame Bolt Set 4

88 Rubber Pad 3

89 Cover Mandrel 2

90 Grip Set 1

91 Cover Pad Set (2) 1

92 Side Bracket Set (2) 1

93 Grommet 1

Page 23For technical questions, please call 1-888-866-5797.Item 59373

SaFetyOperatiOnMaintenance inStallatiOn

assembly Diagram

26677 agoura road • calabasas, ca 91302 • 1-888-866-5797

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.

Visit our website at: http://www.harborfreight.com

email our engine support at: [email protected]

ENGINE FOR 59373

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.

neVer use inside

a home or garage,

eVen iF doors and

windows are open.

Only use OuTSiDe

and far away from

windows, doors,

and vents.

Owner’s Manual & Safety Instructions

Save This Manual 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 (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. 23g

When unpacking, make sure that the product is intact

and undamaged. If any parts are missing or broken,

please call 1-888-866-5797 as soon as possible.

2021 by Harbor Freight Tools

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.

Read this material before using this product.

Failure to do so can result in serious injury.

SAVE THIS MANUAL.

Page 2 For technical questions, please call 1-888-866-5797. ITEM 59373

Table of Contents

Specifications ............................................. 2

Safety ......................................................... 3

Setup .......................................................... 6

Operation .................................................... 8

Maintenance .............................................. 14

Troubleshooting ......................................... 18

Warranties ................................................. 22

Parts List and Diagram .............................. 20

Specifications

Displacement 420cc

Engine Type

Horizontal Single Cylinder 4 stroke OHV

EPA phase III compliant

Cooling System Forced air cooled

Fuel

Type

87+ octane stabilizer treated

unleaded gasoline

Capacity 1.7 Gallon

Engine Oil

Type SAE

10W-30 above 32° F

5W-30 at 32° F or below

Capacity 1.16 Quart

Run Time @ 50% Load

with full tank

3 hr.

Sound Level at 22 feet 108 dB

Bore x Stroke 90 mm x 66 mm

Compression Ratio 8.1:1

Rotation viewed from PTO

(power takeoff - the output shaft)

Counterclockwise

Shaft

Shaft 1″ x 3.48″

Keyway 1/4″ (6.35 mm)

End Tapped 3/8″ - 24

Spark Plug

Type NHSP

/ Torch

F7TC

Gap 0.0275″ - 0.0314″

Valve Clearance

Intake 0.0039″ - 0.0059″

Exhaust 0.0039″ - 0.0059″

Speed Idle 1,800 ± 50 RPM

Page 3For technical questions, please call 1-888-866-5797.ITEM 59373

SaFeTyOperaTiOnMainTenanCe SeTup

WarninG SyMBOLS anD DeFiniTiOnS

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.

Indicates a hazardous situation which, if not avoided,

will result in death or serious injury.

Indicates a hazardous situation which, if not avoided,

could result in death or serious injury.

Indicates a hazardous situation which, if not avoided,

could result in minor or moderate injury.

Addresses practices not related to personal injury.

Symbol Definitions

Symbol property or Statement

rpM

Revolutions Per Minute

Horsepower

WARNING marking concerning

Risk of Eye Injury. Wear ANSI-approved

safety goggles with side shields.

Read the manual before

set-up and/or use.

WARNING marking concerning

Risk of Hearing Loss.

Wear hearing protection.

Symbol property or Statement

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.

WARNING marking concerning

Risk of Fire.

Do not refuel while operating.

Keep flammable objects

away from engine.

Safety Warnings

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.

SaVe THeSe inSTruCTiOnS

Page 4 For technical questions, please call 1-888-866-5797. ITEM 59373

SaFeTy OperaTiOn MainTenanCeSeTup

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.

4. Set up and use only on a flat, level,

well-ventilated surface.

5. Wear ANSI-approved safety goggles, heavy-duty

work gloves, and dust mask/respirator during set up.

6. Use only lubricants and fuel recommended

in the Specifications chart of this manual.

Operating precautions

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.

NEVER use inside a home or garage,

EVEN IF doors and windows are open.

Only use OUTSIDE and far away from windows,

doors, and vents.

2. Keep children away from the equipment,

especially while it is operating.

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.

5. Do not touch engine during use. Let

engine cool down after use.

6. Never store fuel or other flammable

materials near the engine.

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.

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.

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.

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.

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.

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.

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.

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.

Page 5For technical questions, please call 1-888-866-5797.ITEM 59373

SaFeTyOperaTiOnMainTenanCe SeTup

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.

23. Do not refill the fuel tank while the

engine is running or hot.

24. 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.

25. Do not operate the equipment with known

leaks in the engine’s fuel system.

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.

27. Keep hands and feet away from moving parts. Do

not reach over or across equipment while operating.

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.

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.

c. Then, remove the spark plug

cap from the 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.

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.

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.

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.

7. Store equipment out of the reach of children.

8. Follow scheduled engine and

equipment maintenance.

refueling:

1. Do not refill the fuel tank while the

engine is running or hot.

2. Do not smoke, or allow sparks, flames,

or other sources of ignition around the

equipment, especially when refuelling.

3. Do not fill fuel tank to the top. Leave a little

room for the fuel to expand as needed.

4. Refuel in a well-ventilated area only.

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.

SaVe THeSe inSTruCTiOnS.

Operating precautions (continued)

Page 6 For technical questions, please call 1-888-866-5797. ITEM 59373

SaFeTy OperaTiOn MainTenanCeSeTup

Set up

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.

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.

The emission control system for this 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.

WarninG! DO nOT inSTaLL THiS enGine On a

VeHiCLe.

nOT FOr HiGHWay uSe. FOLLOW aLL

appLiCaBLe LaWS FOr inSTaLLaTiOn anD uSe.

WarninG! TO preVenT SeriOuS inJury: if you

do not connect a battery to the positive battery

cable, wrap its terminal securely with electrical tape

(sold separately).

Battery Setup instructions

1. Place a fully charged, lead-acid 12 volt,

300 CCa, 36 ah battery (not included) in

a stable, flat location near the engine.

2. Only use cables sized to match their length

according to the following chart:

Cable Gauge

(lower gauge numbers

mean thicker cables)

Maximum

Cable Length

6 5′

4 7′

2 12′

Starting Relay

Motor Starter Assembly

Attach the positive cable from the positive

battery terminal to the Positive Terminal on

the starter solenoid (uncovered terminal),

shown above. Connect cable securely to

prevent disconnection and short circuits.

4. Attach the negative cable to the

negative battery terminal.

5. Connect the negative cable securely to one

of the engine mounting bolts, as shown in

the diagram below. Connect cable securely to

prevent disconnection and short circuits.

Connect negative

Battery Cable to a

Mounting Bolt

6. Coat the terminals and cable ends with

a corrosion-preventive coating.

Page 7For technical questions, please call 1-888-866-5797.ITEM 59373

SaFeTyOperaTiOnMainTenanCe SeTup

engine Controls

Starter

Handle

Oil Drain plug

air Filter

Fuel Valve

Choke

Fuel Cap

Throttle

engine

Switch

Muffler

Dipstick

Starter

Serial

number

Location

(Write in manual.)

Page 8 For technical questions, please call 1-888-866-5797. ITEM 59373

SaFeTy OperaTiOn MainTenanCeSeTup

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.

pre-Start Checks

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.

Checking and Filling engine Oil

nOTiCe: 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.

Engine will not start with low or no engine oil.

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 turning it counterclockwise,

and wipe it off with a clean, lint free rag.

Full level

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.

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 15 in the Maintenance section shows other

viscosities to use in different average temperatures.)

6. Thread the dipstick back in clockwise.

nOTiCe: Do not run the engine with too little oil.

Engine will shut off if engine oil level is too low.

Page 9For technical questions, please call 1-888-866-5797.ITEM 59373

SaFeTyOperaTiOnMainTenanCe SeTup

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.

1. Clean the Fuel Cap and the area around it.

2. Unscrew and remove the Fuel Cap.

3. If needed, fill the Fuel Tank to about 1 inch

under the fill neck with87 octane or higher

unleaded gasoline that has been treated with

a fuel stabilizer additive. Follow fuel stabilizer

manufacturer’s recommendations for use.

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.

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.

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.

b. inspect the equipment and engine.

c. Fill the engine with the proper amount and type of

both stabilizer-treated unleaded gasoline and oil.

d. read the equipment Operation section in the equipment manual.

Page 10 For technical questions, please call 1-888-866-5797. ITEM 59373

SaFeTy OperaTiOn MainTenanCeSeTup

Manual Start

1. To start a cold engine, move the Choke Lever to the

START position.

To restart a warm engine, leave the

Choke Lever in the RUN position.

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.

4. Turn the Engine Switch on.

note: If engine does not start, check engine oil level.

Engine will not start with low or no engine oil.

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.

STarT run

OFF

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6. Allow the Engine to run for several seconds.

Then, if the Choke Lever is in the START position,

move the Choke Lever very slowly to its RUN position.

note: Moving the Choke Lever too

fast could stall the engine.

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

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.

STarT run

OFF

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electric Start (if equipped)

1. To start a cold engine, move the Choke Lever to the

START position.

To restart a warm engine, leave the Choke Lever in the

RUN position.

If engine does not start, try choke half-way

between RUN and START position.

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.

4. Turn the Engine Switch to START.

note: If engine does not start, check engine oil level.

Engine will not start with low or no engine oil.

STarT run

OFF

OFF STarT

STarT

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5. Allow the Engine to run for several seconds.

Then, if the Choke Lever is in the START position, move

the Choke Lever very slowly to its RUN position.

note: Moving the START Lever too

fast could stall the engine.

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

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.

STarT run

OFF

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SaFeTy OperaTiOn MainTenanCeSeTup

Maintenance

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.

procedure

Before

each use

Monthly or

every 20

hr. of use

every 3 mo. or

50 hr. of use

every 6 mo. or

100 hr. of use

yearly or

every 300

hr. of use

every

2 years

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.

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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.

1. Clean the Fuel Cap and the area around it.

2. Unscrew and remove the Fuel Cap.

3. If needed, fill the Fuel Tank to about 1 inch

under the fill neck with 87 octane or higher

unleaded gasoline that has been treated with

a fuel stabilizer additive. Follow fuel stabilizer

manufacturer’s recommendations for use.

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.

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.

engine Oil Change

CauTiOn! Oil is very hot during operation and can

cause burns. Wait for engine to cool before changing oil.

1. Make sure the engine is stopped and is level.

2. Close the Fuel Valve.

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.

5. Replace the drain plug and tighten it.

6. Clean the top of the Dipstick and the area around it.

Remove the Dipstick by turning it counterclockwise,

and wipe it off with a clean, lint free rag.

Full level

Add the appropriate type of oil until the oil level is at

the full level. SAE 10W-30 oil is recommended for

general use.

The SAE Viscosity Grade chart shows other

viscosities to use in different average temperatures.

10W-30

5W-30

-20 0 20 40 60 80 100°F

Sae Viscosity Grades

average outdoor temperature

8. Thread the dipstick back in clockwise.

nOTiCe: Do not run the engine with too little oil.

Engine will not start with low or no engine oil.

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SaFeTy OperaTiOn MainTenanCeSeTup

air Filter element Maintenance

1. Remove the air filter cover and the air filter elements

and check for dirt. Clean as described below.

2. Cleaning:

• For “paper” filter elements:

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.

• For foam filter elements:

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. Install the cleaned filter. Secure the

Air Cleaner Cover before use.

Spark plug Maintenance

Spark

plug

Cap

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.

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.

Use only NHSP®/Torch® F7TC spark plug.

nOTiCe: Using an incorrect spark

plug may damage the engine.

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.

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 tighten

about 1/2 to 2/3 turn more.

Non-gasket-style: Finger-tighten until

the plug contacts the head, then

tighten 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.

6. Apply dielectric spark plug boot protector

(not included) to the end of the spark

plug and reattach the wire securely.

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Storage

When the equipment is to remain idle for longer than 20

days, prepare the Engine for storage as follows:

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.

2. FueL:

To protect the fuel tank during storage, fill the

tank with gasoline that has been treated with

a fuel stabilizer additive. Follow fuel stabilizer

manufacturer’s recommendations for use. Refer

to ”Checking and Filling Fuel” on page 9.

WarninG! TO preVenT SeriOuS

inJury FrOM Fire:

Fill 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.

3. LuBriCaTiOn:

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.

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).

4. BaTTery:

Disconnect battery cables (if equipped).

Recharge batteries monthly while in storage.

5. STOraGe area:

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.

nOTiCe: During extended storage periods the

Engine must be started every 3 months and allowed

to run for 15 – 20 minutes or the Warranty is VOID.

6. aFTer STOraGe:

Before starting the Engine during or 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.

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SaFeTy OperaTiOn MainTenanCeSeTup

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 START position, cold engine.

3. Gasoline with more than 10% ethanol used.

(E15, E20, E85, etc.)

4. Low quality or deteriorated, old gasoline.

5. Carburetor not primed.

6. Dirty fuel passageways.

7. Carburetor needle stuck.

Fuel can be smelled in the air.

8. Too much fuel in chamber. This can be caused

by the carburetor needle sticking.

9. Clogged Fuel Filter.

FUEL RELATED:

1. Fill fuel tank with fresh 87+ octane stabilizer-

treated unleaded gasoline and open fuel

valve.

Do not use gasoline with more than

10% ethanol (e15, e20, e85, etc.).

2. Move Choke to START position.

3. Clean out ethanol rich gasoline from fuel

system. Replace components damaged by

ethanol. Use fresh 87+ octane stabilizer-

treated unleaded gasoline only.

Do not use gasoline with more than

10% ethanol (e15, e20, e85, etc.).

4. Use fresh 87+ octane stabilizer-treated

unleaded gasoline.

Do not use gasoline with more than

10% ethanol (e15, e20, e85, etc.).

5. Pull on Starter Handle to prime.

6. Clean out passageways using fuel additive.

Heavy deposits may require further cleaning.

7. Gently tap side of carburetor float

chamber with screwdriver handle.

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 START position.

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.

4. Spark plug cap broken.

5. Circuit breaker tripped.

6. Incorrect spark timing or faulty ignition system.

IGNITION (SPARK) RELATED:

1. Connect spark plug cap properly.

2. Clean spark plug.

3. Correct spark plug gap.

4. Replace spark plug cap.

5. Reset circuit breaker. Check wiring and

starter motor if breaker continues to trip.

6. Have qualified technician diagnose/

repair ignition system.

COMPRESSION RELATED:

1. Cylinder not lubricated.

Problem after long storage periods.

2. Loose or broken spark plug.

(Hissing noise will occur

when trying to start.)

3. Loose cylinder head or damaged head gasket.

(Hissing noise will occur when trying to start.)

4. Engine valves or tappets mis-adjusted or stuck.

ENGINE OIL RELATED:

1. Low engine oil.

2. Engine mounted on slope,

triggering low oil shutdown.

COMPRESSION RELATED:

1. Pour tablespoon of oil into spark plug

hole. Crank engine a few times

and try to start again.

2. Tighten spark plug.

If that does not work, replace spark plug.

If problem persists, may have

head gasket problem, see #3.

3. Tighten head.

If that does not remedy problem,

replace head gasket.

4. Have qualified technician adjust/

repair valves and tappets.

ENGINE OIL RELATED:

1. Fill engine oil to proper level.

Check engine oil before EVERY use.

2. Operate engine on level surface.

Check engine oil level.

Follow all safety precautions whenever diagnosing or servicing the equipment or engine.

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problem possible Causes probable Solutions

Engine misfires

1. Spark plug cap loose.

2. Incorrect spark plug gap or

damaged spark plug.

3. Defective spark plug cap.

4. Old or low quality gasoline.

5. Incorrect compression.

1. Check cap and wire connections.

2. Re-gap or replace spark plug.

3. Replace spark plug cap.

4. Use only fresh 87+ octane stabilizer-treated

unleaded gasoline.

Do not use gasoline with more than

10% ethanol (e15, e20, e85, etc.).

5. Diagnose and repair compression.

(Use engine will not start:

COMpreSSiOn reLaTeD section.)

Engine stops

suddenly

1. Fuel tank empty or full of impure or low quality

gasoline.

2. Low oil shutdown.

3. Defective fuel tank cap creating vacuum,

preventing proper fuel flow.

4. Faulty magneto.

5. Disconnected or improperly

connected spark plug cap.

1. Fill fuel tank with fresh 87+ octane stabilizer-

treated unleaded gasoline.

Do not use gasoline with more than

10% ethanol (e15, e20, e85, etc.).

2. Fill engine oil to proper level.

Check engine oil before EVERY use.

3. Test/replace fuel tank cap.

4. Have qualified technician service magneto.

5. Secure spark plug cap.

Engine stops when

under heavy load

1. Dirty air filter

2. Engine running cold.

1. Clean element.

2. Allow engine to warm up prior

to operating equipment.

Engine knocks

1. Old or low quality gasoline.

2. Engine overloaded.

3. Incorrect spark timing, deposit buildup,

worn engine, or other mechanical problems.

1. Fill fuel tank with fresh 87+ octane stabilizer-

treated unleaded gasoline.

Do not use gasoline with more than

10% ethanol (e15, e20, e85, etc.).

2. Do not exceed equipment’s load rating.

3. Have qualified technician diagnose

and service engine.

Engine backfires

1. Impure or low quality gasoline.

2. Engine too cold.

3. Intake valve stuck or overheated engine.

4. Incorrect timing.

1. Fill fuel tank with fresh 87+ octane stabilizer-

treated unleaded gasoline.

Do not use gasoline with more than

10% ethanol (e15, e20, e85, etc.).

2. Use cold weather fuel and

oil additives to prevent backfiring.

3. Have qualified technician diagnose

and service engine.

4. Check engine timing.

After sudden

impact, engine will

run, but equipment

will not operate

Shaft key or other shear pin broken by impact

to disconnect engine and limit damage.

Have qualified technician check

and replace broken shaft key

or other shear pins.

Follow all safety precautions whenever diagnosing or servicing the equipment or engine.

pLeaSe reaD THe FOLLOWinG CareFuLLy