Manual For The 62554 8 HP (301cc) OHV Horizontal Shaft Gas Engine EPA

User Manual: Manual for the 62554 8 HP (301cc) OHV Horizontal Shaft Gas Engine EPA 8 HP (301cc) OHV Horizontal Shaft Gas Engine EPA

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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 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.

17e

Using an engine indoors
CAN KILL YOU IN MINUTES.
Engine exhaust contains carbon monoxide.
This is a poison you cannot see or smell.

301

INE
NG
EE
OLIN
GAS

:6
ITEM

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.

Visit our website at: http://www.harborfreight.com
Email our engine support at: predator@harborfreight.com

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.
Copyright© 2015 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.

Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.

Table of Contents
Specifications ............................................. 2
Safety ......................................................... 3
Setup .......................................................... 6
Operation .................................................... 8

Maintenance .............................................. 12
Troubleshooting ......................................... 16
Warranties ................................................. 18
Parts Lists and Diagrams .......................... 20

Specifications
Displacement
Engine Type
Cooling System
Type

Fuel

Capacity
Engine Oil

Type SAE

Capacity
Run Time @ 50% Load
with full tank
Sound Level
Bore x Stroke
Compression Ratio
Rotation viewed from PTO
(power takeoff - the output shaft)

Spark Plug
Valve Clearance
Speed
Shaft

301cc
Horizontal Single Cylinder
4-stroke OHV
Forced air cooled
87+ octane stabilizer treated
unleaded gasoline
1.45 Gallon
10W-30 above 32° F
5W30 at 32° F or below
1 Quart
2.5 hr.
106 dB
80 mm x 60 mm
8.3:1
Counterclockwise

Type
Gap
Intake
Exhaust
Idle

F7RTC
0.0275" - 0.0314"
0.0039" - 0.0059"
0.0039" - 0.0059"
1800 ±100 RPM

Shaft

Ø1″ x 3.48″

Keyway

0.25″

End Tapped

7/16″ - 20 UNF

The emissions 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.

Page 2

For technical questions, please call 1-888-866-5797.

ITEM 62554

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.

SAFETY

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.

RpM
Hp

property or Statement
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.

OpERATION

Symbol

SETUp

Symbol Definitions

IMpORTANT SAFETY INSTRUCTIONS
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.

ITEM 62554

For technical questions, please call 1-888-866-5797.

MAINTENANCE

SAVE THESE INSTRUCTIONS

Page 3

Set up precautions

SAFETY

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.

4. Set up and use only on a flat, level,
well-ventilated surface.

2. Have multiple ABC class fire extinguishers nearby.

6. Use only lubricants and fuel recommended
in the Specifications chart of this manual.

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.

5. Wear ANSI-approved safety goggles, heavy-duty
work gloves, and dust mask/respirator during set up.

Operating precautions
1.

SETUp

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.

10. Do not leave the engine unattended when it is
running. Turn off the engine (and remove safety
keys, if available) before leaving the work area.
11. The engine can produce high noise levels.
Prolonged exposure to noise levels
above 85 dBA is hazardous to hearing.
Wear ear protection when operating the engine
or when working nearby while it is operating.
12. Wear ANSI-approved safety glasses
and hearing protection during use.

NEVER use inside a home or garage,
EVEN IF doors and windows are open.

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.

OpERATION

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.
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.

MAINTENANCE

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 it from rolling, slipping, and tilting.
9. Industrial applications must follow
OSHA requirements.
Page 4

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
engine. Do not use while tired or under the
influence of drugs, alcohol or medication.
17. 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.
18. Parts, especially exhaust system components,
get very hot during use. Stay clear of hot parts.
19. Do not cover the engine during operation.
20. Keep the engine and surrounding
area clean at all times.
21. Do not smoke, or allow sparks, flames,
or other sources of ignition around the
equipment, especially when refuelling.

For technical questions, please call 1-888-866-5797.

ITEM 62554

Operating precautions (cont.)

23. Do not operate the equipment with known
leaks in the engine’s fuel system.
24. 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.

25. Keep hands and feet away from moving parts.
Do not reach over or across
equipment while operating.
26. 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.

SAFETY

22. 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.

27. 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.

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.
Refuel in a well-ventilated area only.

OpERATION

1. Before service, maintenance, or cleaning:

SETUp

Service precautions

4. 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.

MAINTENANCE

SAVE THESE INSTRUCTIONS.

ITEM 62554

For technical questions, please call 1-888-866-5797.

Page 5

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.

SAFETY

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.
WARNING! DO NOT INSTALL THIS ENGINE ON A VEHICLE.
NOT FOR HIGHWAY USE. FOLLOW ALL AppLICABLE LAWS FOR INSTALLATION AND USE.
WARNING! INSTALL THIS ENGINE ACCORDING TO EQUIpMENT INSTRUCTIONS BEFORE USE.

Components and Controls
SETUp

Air Cleaner

Fuel Cap

OpERATION

Starter
Handle

Muffler

Oil Drain plug

MAINTENANCE

Throttle

Dipstick

Choke
Fuel Valve
Engine
Switch

Page 6

For technical questions, please call 1-888-866-5797.

ITEM 62554

High Altitude Operation Above 3000 feet

NOTICE Warranty void if necessary adjustments are not made for high altitude use.
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 fuel system on this engine may be influenced by
operation at higher altitudes. Proper operation can be ensured by installing an altitude kit at altitudes higher than
3000 ft. above sea level. At elevations above 8000 ft, the engine may experience decreased performance, even
with the proper main jet. Operating this engine without the proper altitude kit installed may increase the engine’s
emissions and decrease fuel economy and performance. The kit should be installed by a qualified mechanic.

SAFETY

WARNING! TO pREVENT SERIOUS INJURY FROM FIRE:
Follow instructions 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 proceeding. Do not smoke.

1. Turn off the engine.
2. Close the fuel valve.

Carburetor
Assembly

4. Unthread the bolt holding the fuel cup.

Fuel Cup Seal

CAUTION! Carburetor bowl may have gas in it
which will leak upon removing the bolt.

Mixing Tube
(might remain
inside carburetor)

5. Remove the bolt, Bolt Seal, fuel cup, Fuel Cup Seal and
Main Jet from the body of the carburetor assembly.
A carburetor screwdriver (not included) is needed
to remove and install the Main Jet.

SETUp

3. Place a bowl under the fuel cup to catch any spilled fuel.

Main Jet

Fuel Cup

Note: The mixing tube is held in place by the main jet and
might fall out when it is removed. If it falls out, replace it in
the same orientation before replacing the main jet.
6. Replace the Main Jet with the replacement Main Jet
needed for your altitude range (part 1a or 2a).

OpERATION

Bolt Seal

Bolt

Note: The Fuel Cup Seal and Bolt Seal may be damaged during removal
and should be replaced with the new ones from the kit.
7. Replace the Fuel Cup Seal (4a), fuel cup, Bolt Seal (3a), and bolt. Tighten in place.
NOTICE: Do not cross thread bolt when tightening.
Finger tighten first and then use a wrench to make sure the bolt is properly threaded.

MAINTENANCE

8. 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.

High Altitude Kit parts List - A
part
1a
2a
3a
4a

ITEM 62554

Description
Main Jet 3000-6000 ft.
Main Jet 6000-8000 ft.
Bolt Seal
Fuel Cup Seal

Qty
1
1
1
2

For technical questions, please call 1-888-866-5797.

Page 7

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.

SAFETY

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

SETUp

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.

Full 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.

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.

OpERATION

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 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.

MAINTENANCE
Page 8

For technical questions, please call 1-888-866-5797.

ITEM 62554

Checking and Filling Fuel

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 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.

SAFETY

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

Note: Do not use gasoline containing more than
10% ethanol (E10). Do not use E85 ethanol.

SETUp

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.

Starting the Engine
Before Starting the Engine

MAINTENANCE

OpERATION

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 unleaded gasoline and oil.
d. Read the Equipment Operation section in the equipment manual.

ITEM 62554

For technical questions, please call 1-888-866-5797.

Page 9

Manual Start

SAFETY

1. To start a cold engine, move the Choke to the
START position.
To restart a warm engine, leave the
Choke in the RUN position.

START

2. Open the Fuel Valve.

RUN

SETUp

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.

OpERATION

O
OFF
4. Turn the Engine Switch on.

ON
I

MAINTENANCE

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.

Page 10

For technical questions, please call 1-888-866-5797.

ITEM 62554

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.

START

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.

SAFETY

Note: Moving the Choke Lever too
fast could stall the engine.

RUN

7. Adjust the Throttle as needed.

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.

SETUp

• Do not operate the engine at its maximum speed.
c. The maintenance break-in period will last about 20 hours of use.
• Change the engine oil after this period.
Under normal operating conditions subsequent maintenance follows
the schedule explained in the MAINTENANCE section.

Stopping the Engine

OFF

OpERATION

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 to SLOW (the “turtle”).
b. Turn the Engine Switch off.
c. Close the Fuel Valve.

NOTICE
MAINTENANCE

Drain fuel at end of season
or warranty is void.
See Storage on page 15 for
complete storage instructions.

ITEM 62554

For technical questions, please call 1-888-866-5797.

Page 11

Maintenance

WARNING
SAFETY

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
SETUp

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.
Before
Each Use

procedure

Monthly or
Every 3 mo. or Every 6 mo. or
every 20
50 hr. of use 100 hr. of use
hr. of use

Yearly or
every 300
hr. of use

Every
2 Years

Brush off outside of engine
Check engine oil level
Check air filter
Check deposit cup
Change engine oil

OpERATION

Clean/replace air filter
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.
MAINTENANCE
Page 12

For technical questions, please call 1-888-866-5797.

ITEM 62554

Checking and Filling Fuel

Engine Oil Change

CAUTION! Oil is very hot during operation and can
cause burns. Wait for engine to cool before changing oil.

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

4. Remove the drain plug and, if possible,
tilt the crankcase slightly to help drain
the oil out. Recycle used oil.

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.

SAFETY

2. Close the Fuel Valve.
3. Place a drain pan (not included) underneath
the crankcase’s drain plug.

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

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.

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.
The SAE Viscosity Grade chart shows other
viscosities to use in different average temperatures.

SETUp

2. Unscrew and remove the Fuel Cap.

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

SAE Viscosity Grades

10W-30
5W-30
-20

100°F

OpERATION

Average outdoor temperature
8. Thread the dipstick back in clockwise.

MAINTENANCE

NOTICE: Do not run the engine with too little oil.
Engine will not start with low or no engine oil.

ITEM 62554

For technical questions, please call 1-888-866-5797.

Page 13

Air Filter Element Maintenance
1. Remove the air cleaner cover and
the air filter element(s) and check for
dirt. Clean as described below.
2. Cleaning:

SAFETY

• 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.

SETUp

3. Install the cleaned filter. Secure the
Air Cleaner Cover before use.

Spark plug Maintenance

Spark
plug
Cap

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.
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.
NOTICE: Replace only with a F7RTC Spark Plug.
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
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 1/2-2/3 turn more.

OpERATION

• Non-gasket-style:
Finger-tighten until the plug
contacts the cylinder 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.

MAINTENANCE
Page 14

For technical questions, please call 1-888-866-5797.

ITEM 62554

When the equipment is to remain idle for longer than
20 days, prepare the Engine for storage as follows:

c. Replace spark plug, but leave
spark plug cap disconnected.

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.

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).

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.

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.
5. 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.

SETUp

2. FUEL:

4. 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.

SAFETY

Storage

MAINTENANCE

OpERATION

b. Clean out area around spark plug.
Remove spark plug and pour one tablespoon of
engine oil into cylinder through spark plug hole.

ITEM 62554

For technical questions, please call 1-888-866-5797.

Page 15

Troubleshooting
problem

possible Causes

Engine will not start FUEL RELATED:

probable Solutions
FUEL RELATED:

SAFETY
SETUp
OpERATION
MAINTENANCE

1. No fuel in tank or fuel valve closed.

1. Fill fuel tank with fresh 87+ octane stabilizertreated unleaded gasoline and open fuel
valve.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).

2. Choke not in START position, cold engine.

2. Move Choke to START position.

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 stabilizertreated 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 stabilizer-treated
unleaded gasoline.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).

5. Carburetor not primed.

5. Pull on Starter Handle to prime.

6. Dirty fuel passageways.

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 START position.

9. Clogged Fuel Filter.

9. Replace Fuel Filter.

IGNITION (SPARK) RELATED:

1. Spark plug cap not connected securely.

1. Connect spark plug cap properly.

2. Spark plug electrode wet or dirty.

2. Clean spark plug.

3. Incorrect spark plug gap.

3. Correct spark plug gap.

4. Spark plug cap broken.

4. Replace spark plug cap.

5. Incorrect spark timing or faulty ignition system.

5. Have qualified technician diagnose/
repair ignition system.

COMPRESSION RELATED:

1. Cylinder not lubricated.
Problem after long storage periods.

1. Pour tablespoon of oil into spark 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 adjust/
repair valves and tappets.

ENGINE OIL RELATED:

1. Low engine oil.

1. Fill engine oil to proper level.
Check engine oil before EVERY use.

2. Engine mounted on slope,
triggering low oil shutdown.

2. Operate engine on level surface.
Check engine oil level.

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

Page 16

For technical questions, please call 1-888-866-5797.

ITEM 62554

1. Spark plug cap loose.

1. Check cap and wire connections.

2. Incorrect spark plug gap or
damaged spark plug.

2. Re-gap or replace spark plug.

3. Defective spark plug cap.

3. Replace spark plug cap.

4. Old or low quality gasoline.

4. Use only fresh 87+ octane stabilizer-treated
unleaded gasoline.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).

5. Incorrect compression.

5. Diagnose and repair compression.
(Use Engine will not start:
COMpRESSION RELATED section.)

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

1. Fill fuel tank with fresh 87+ octane stabilizertreated unleaded gasoline.
Do not use gasoline with more than
10% ethanol (E15, E20, E85, etc.).

2. Low oil shutdown.

2. Fill engine oil to proper level.
Check engine oil before EVERY use.

3. Defective fuel tank cap creating vacuum,
preventing proper fuel flow.

3. Test/replace fuel tank cap.

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
under heavy load

1. Dirty air filter

1. Clean element.

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 stabilizertreated 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.

1. Impure or low quality gasoline.

1. Fill fuel tank with fresh 87+ octane stabilizertreated 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.

3. Have qualified technician diagnose
and service engine.

4. Incorrect timing.

4. Check engine timing.

Engine stops
suddenly

Engine backfires

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.

SAFETY

probable Solutions

SETUp

Engine misfires

possible Causes

OpERATION

problem

Have qualified technician check and replace
broken shaft key or other shear pins.

MAINTENANCE

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

ITEM 62554

For technical questions, please call 1-888-866-5797.

Page 17

Warranties

Limited 90 Day Warranty (Retail)
SAFETY

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, EXCEPT FOR THE EMISSIONS CONTROL SYSTEM WARRANTY BELOW.

SETUp

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.

Emissions Control System Warranty
Harbor Freight Tools (HFT) is pleased to explain the emissions control system warranty on your Small Off-Road
Engine produced after January 1, 2015 (engine), in addition to the Retail Warranty above. HFT warrants that the
emissions control system on your engine is designed, built, and equipped so that it conforms to the United States
Environmental Protections Agency’s (EPA) emissions requirements in effect at the time of manufacture. HFT also
warrants that the emissions control system on your engine will be free from defects in material and workmanship for
two (2) years, provided there has been no improper maintenance, misuse, or abuse of your engine.

OpERATION

Your emissions 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 emissions-related assemblies.

WHAT WE WILL DO
Where a warrantable condition exists, HFT will repair or replace, at our option, any emissions-related part on
your engine if it becomes defective, malfunctions, or otherwise fails to conform with this warranty under normal use
and service during the two (2) year term of this warranty at no cost to you, including diagnosis, parts and labor. This
warranty applies to the original purchaser and any subsequent owner within the two year warranty period.

WHAT IS COVERED?
The following parts are examples of components of the emissions control system and are covered by this
two (2) year warranty. For a full list of emissions control components covered by this warranty, please see 40 CFR
§1068, Appendix I.

MAINTENANCE

1. Fuel Metering System
a. Carburetor and its internal parts.
b. Fuel pump (if so equipped).
c. Cold start enrichment system.

4. Catalyst System (if so equipped)
a. Exhaust pipe stud.
b. Muffler.
c. Catalytic converter (if so equipped).

2. Air Induction System
a. Intake pipe/manifold.
b. Air cleaner.

5. Miscellaneous Items Used in Above Systems
a. Vacuum, temperature and time sensitive valves
and switches.
b. Hoses, belts, connectors, and assemblies.

3. Ignition System
a. Spark plug.
b. Magneto ignition system.

This warranty does not cover normal maintenance services or replacement of maintenance items such as filters,
oils, or spark plugs.
Page 18

For technical questions, please call 1-888-866-5797.

ITEM 62554

WHAT YOU MUST DO TO OBTAIN WARRANTY SERVICE

pLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LISTS AND ASSEMBLY
DIAGRAMS 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 62554

For technical questions, please call 1-888-866-5797.

Page 19

MAINTENANCE

OpERATION

SETUp

In order to obtain warranty repair or replacement, you may either (a) contact HFT product support at 1-888-866-5797
or predator@harborfreight.com; or (b) bring the to your nearest Harbor Freight Tools retail store. When going to the
retail store or contacting product support, you must indicate the specific emissions control part or defect that you are
claiming and the date this was originally purchased. The nearest Harbor Freight Tools retail store can be found on the
internet at http://www.harborfreight.com.

SAFETY

As the engine owner, you are responsible for the performance of the required maintenance listed in your
Owner’s Manual. HFT may deny you warranty coverage if your engine or a part has failed due to abuse (including
failure to follow the fuel use instructions contained in this manual), neglect, improper maintenance, or unapproved
modifications.

parts Lists and Diagrams

parts List
SAFETY
SETUp
OpERATION
MAINTENANCE

No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48

Description
Crankcase
Flat Washer
Bolt, Drain Plug
Cable Cleat
Lifter Valve
Key, Special Woodruff
Crankshaft Assy
Camshaft Assy
Key
Starter Assy, Recoil
Switch Assy, Oil Level
Bolt, Flange
Governor Kit
Pin, Dowel
Packing, Case Cover
Ball Bearing
Cover Assy., Crank Case
Cap Assy, Oil Filler
Bolt, Flange
Oil Seal
Shaft, Governor Arm
Flat Washer
Pin, Lock
Bolt, Governor Arm
Arm, Governor
Rod, Governor
Spring, Throttle Return
Spring, Cable Return
Control Assy.
Bolt, Flange
Location Cable Clip
Alert Unit, Oil
Flywheel Comp
Fan, Cooling
Pulley, Starter
Nut,Flange
Recoil Starter Comp.
Switch Assy., Engine Stop
Bolt, Flange
Coil Assy., Ignition
Bolt, Flange
Nut
Tank Comp., Fuel
Gas Valve, Fuel Tank
Fuel Cap
Filter, Fuel
Conn Rod Assy
Clip Piston Pin

Page 20

Qty
1
2
2
1
2
1
1
1
1
1
1
2
1
2
1
1
1
2
7
2
1
1
1
1
1
1
1
1
1
10
1
1
1
1
1
1
1
1
2
1
2
5
1
1
1
1
1
2

No.
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96

Description
Pin, Piston
Piston
Ring Set, Piston
Pin, Dowel
Gasket, Cylinder Head
Shroud
Cylinder Head Comp
Bolt, Stud
Gasket, Ex. Pipe
Muffler Assy.
Nut, Flange
Bolt, Stud
Packing., Carburetor
Insulator, Carburetor
Packing., Carburetor
Carburetor
Packing., Carburetor
Air Cleaner Assy
Nut, Flange
Loop, Tube
Pipe
Tube, Fuel
Loop, Tube
Spark Plug
Bolt, Flange
Push Rod
Valve Rocker Shaft
Rocker Arm Assy.
Rocker Arm Assy.
Retainer, Rocker Arm Shaft
Packing, Head Cover
Cover Comp. Head
Tube, Breather
Bolt, Flange
Location Cable Clip
Valve Assy.
Seal, Valve Stem
Seat, Valve Spring
Spring, Valve
Retainer, Valve Spring
Valve Keeper
Rotator, Valve
Bolt, Flange
Gasket, Muffler
Pipe, Exhaust
Carbon Canister Assy
Loop, Tube
Pipe

For technical questions, please call 1-888-866-5797.

Qty
1
1
1
2
1
1
1
2
1
1
2
2
1
1
1
1
1
1
4
2
1
1
2
1
4
2
2
1
1
1
1
1
1
6
1
1
1
1
2
2
4
2
2
1
1
1
1
1

ITEM 62554

89
87
85

88
86

73 7374

2
20

42
25
24

23
22

55
7

6
31
30

21
14

42
34

93
30

30
30

56
52

75
73

30 30

73
62

SETUp

30
78

84
68

82
82

88
87

82
82

2
11

13
12
12

14
19
18

19
19
19
19

OpERATION

SAFETY

Assembly Diagram

MAINTENANCE

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.
ITEM 62554

For technical questions, please call 1-888-866-5797.

Page 21

Not to scale.

0.5" / 13mm

SAFETY

0.4" / 12mm

SETUp

7.6" / 195.5mm

6.1" / 155.5mm

OpERATION

MAINTENANCE

ITEM 62554

For technical questions, please call 1-888-866-5797.

Page 22

Mounting Hole Diagram
Note:

3.7" / 95.5mm

SAFETY
MAINTENANCE

OpERATION

SETUp

Not to scale.

power Take-Off Diagram

Note:

ITEM 62554

For technical questions, please call 1-888-866-5797.

Page 23

3491 Mission Oaks Blvd. • pO Box 6009 • Camarillo, CA 93011 • 1-888-866-5797

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Modify Date                     : 2017:05:24 16:23:25Z

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Manual For The 62554 8 HP (301cc) OHV Horizontal Shaft Gas Engine EPA

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