Greyhound 66524-11 HP Parts list manual
OHV GAS ENGINE - HORIZONTAL
Model
66524-11 HP
66525-13 HP
ASSEMBLY AND OPERATION INSTRUCTIONS
IMPORTANT!
Your Warranty is voided if:
You do not put Engine oil in
the Engine’s crankcase prior
the Engine with low or no
low or no oil will permanently
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Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
Copyright©2008 by Harbor Freight Tools®
contained herein may be reproduced in any shape or form without the express written consent of Harbor
For technical questions or replacement parts, please call 1-800-444-3353.
Page 2
SKU 66524-66525 For technical questions, please call 1-800-444-3353.
SPECIFICATIONS
Model 66525 Model 66524
Engine Type
Powered w/mid-to-high octane
unleaded gasoline
Powered w/mid-to-high octane
unleaded gasoline
Fuel Tank Capacity
Counterclockwise facing the Shaft Counterclockwise facing the Shaft
Spark Plug Type ®® ®®
88 x 64 mm 82 x 64 mm
Shaft Centerline
Speed
Weight
IMPORTANT! This product requires oil and fuel to be added before starting. Attempting to start the Engine
without oil WILL ruin the Engine and void the warranty.
NOTE: The Engine’s carburetor may need to be adjusted by a qualied mechanic for efcient high-altitude use.
* The emission control system for this Engine is warranted for standards set by the U.S. Environmental
Protection Agency for warranty information, refer to the last pages of this manual.
**See Bolt Circle Pattern illustration on page 7.
SKU 66524-66525 For technical questions, please call 1-800-444-3353.
SAVE THIS MANUAL
Keep this manual for the safety warnings
product’s serial number in the back of the manual
manual and the receipt in a safe and dry place
GENERAL SAFETY RULES
WARNING! Read all instructions.
Failure to follow all instructions
listed below may result in re,
serious injury and/or DEATH.
The warnings and precautions
discussed in this manual cannot
cover all possible conditions and
be understood by the operator that
common sense and caution are
factors which cannot be built into
SAVE THESE INSTRUCTIONS
WORK AREA
Keep your work area clean and well
create sparks which may ignite the
visitors away while operating a power
work area from debris such as chips
PERSONAL SAFETY
doing and use common sense when
this Engine while tired or under
while operating the Engine may result
Proper footing and balance enables
better control of the Engine in
hearing protection must be used
and hearing protection when using
or performing maintenance on this
TOOL USE AND CARE
better and safer at the rate for which
REV 10d
Page 4
SKU 66524-66525 For technical questions, please call 1-800-444-3353.
Engine and do not use the Engine for
Ignition Switch does not turn it on or
with the Ignition Switch is dangerous
from the Engine before making any
safety measures reduce the risk of
disconnect the Spark Plug Wire
engines are less likely to malfunction
If damaged, have the Engine
serviced before using.
accidents are caused by poorly
Use only accessories that are
recommended by the manufacturer
be suitable for one tool may become
SERVICE
Engine service must be performed
Service or maintenance performed by
parts or failure to follow maintenance
SPECIFIC SAFETY RULES
IMPORTANT! Your Warranty is1.
voided if:
You do not put engine oil ina.
the Engine’s crankcase prior
its rst use. Before each use,
check the oil level. Never run
the Engine with low or no engine
oil. Running the Engine with low
or no Engine oil will permanently
damage the Engine.
contact Harbor Freight Tools for a
sure you are prepared to begin work
People with pacemakers should
proximity to a heart pacemaker
could cause pacemaker interference
REV 10d
Page 5
SKU 66524-66525 For technical questions, please call 1-800-444-3353.
necessary when near the Engine’s
away from all moving parts of the
Prior to installing the Engine onto a
read and understand all instructions
and safety precautions as outlined
in the owner’s manual for the power
TOXIC FUMES, FIRE, AND
EXPLOSION PRECAUTIONS
This Engine is designed for outdoor
in a closed area or in a poorly
excessive carbon monoxide fumes in
the work area and in the surrounding
Use proper fuel storage and handling
Keep the Engine and surrounding
live electrical parts and connections
known leaks in the Engine’s fuel
Use only Engine manufacturer
MECHANICAL PRECAUTIONS
always make sure the Engine’s
the Engine that is assembled by the
REV 10d
Page 6
SKU 66524-66525 For technical questions, please call 1-800-444-3353.
CHEMICAL PRECAUTIONS
immediately wash with soap and
NOISE PRECAUTION
Prolonged exposure to high noise
when operating or working around the
MISC. PRECAUTION
WARNING: The warnings and
precautions discussed in this manual
cannot cover all possible conditions and
understood by the operator that common
sense and caution are factors which
UNPACKING
call Harbor Freight Tools at the number
shown on the cover of this manual as soon
ASSEMBLY INSTRUCTIONS
TO MOUNT THE ENGINE
IMPORTANT:1. If you have any doubts
about your ability to perform the
with which to mount the Engine to
(See
Figure A and Engine Mounting
Diagram on the following page.)
Set the Engine side-by-side to the
mounting holes of the Engine with
the mounting holes in the power
NOTE: There are
different patterns of mounting holes
that best match the ones on the
(See Figure A
and Engine Mounting Diagram.)
length to secure the Engine to the
(See Figure
A and Engine Mounting Dia.)
SKU 66524-66525 For technical questions, please call 1-800-444-3353.
5-5/8”
7-11/16”
8-3/4”
1/2”
5-3/16”
3-1/8”
4-5/16”
ENGINE MOUNTING DIAGRAM
M10 M10
M10
M8
M10
7/8”
5-1/4”
5”
M8
M8
M8
M8
M8
REV 10d
Page 8
SKU 66524-66525 For technical questions, please call 1-800-444-3353.
CAUTION! Check to make sure5.
the Bolts, Washers, Lock Washers,
and the Nuts used DO NOT come
in contact with any moving part of
the Engine and power equipment
unit.
NOTE:6.
unit’s owner manual for instructions
on how to properly install a belt drive
TO PROVIDE BATTERY POWER
TO THE STARTER MOTOR
Page 26
To provide battery power to the
the BLACK
connect the RED
(See Figure
B.)
PRE-OPERATING
INSTRUCTIONS
Make sure the Engine’s Crankcase1.
is lled with approximately 37
ounces of 10-30W automotive oil.
Also, make sure the Engine’s Fuel
Tank is lled with approximately
1-1/2 gallon of unleaded gasoline
before attempting to start the
Engine. Failure to do so WILL
damage the Engine and void the
(See
Figure C.)
Unscrew and remove the Fuel Filler
SKU 66524-66525 For technical questions, please call 1-800-444-3353.
screw the Fuel Filler Cap back onto
(See Figure C.)
OPERATING INSTRUCTIONS
NOTE: THIS ENGINE INCLUDES
AN AUTOMATIC LOW OIL SHUTDOWN
SENSOR THAT DISABLES THE ENGINE
IF THE OIL LEVEL IS TOO LOW.
Make sure the power equipment1.
unit’s transmission (if applicable)
is in its “NEUTRAL” or “PARK”
position before attempting to start
the Engine.
“OPEN”
the Choke to its “START”
to its “SLOW”(See Fig.
D.)
“RUN”
battery
“START”
NOTE: To prolong
(See
Figure E.)
“RUN”
Choke to its “RUN”
(See Figure D.)
IMPORTANT:6.
each startup so the Engine can
to its “OFF”
(See Figure D
and E.)
NOTE:8.
can be turned off by either:
“OFF”
REV 10d
SKU 66524-66525 For technical questions, please call 1-800-444-3353.
“CLOSED”
REV 09i
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INSPECTION, MAINTENANCE, AND CLEANING SCHEDULE
WARNING!1.
Engine and disconnect the Spark Plug Wire from the Spark Plug to prevent acci-
-
Do not use damaged equipment.
Follow all maintenance procedures as outlined in the Engine Maintenance
Schedule
-
fuel in the Engine’s Fuel Tank and Carburetor may become contaminated and pre-
CAUTION! All maintenance, service, and repairs not mentioned in this manu-6.
al must only be performed by a qualied service technician.
SKU 66524-66525 For technical questions, please call 1-800-444-3353.
Troubleshooting
Problem Possible Cause Possible Solution
Engine will not
start
Follow all safety precautions whenever diagnosing or servicing the
equipment or engine.
SKU 66524-66525 For technical questions, please call 1-800-444-3353.
PARTS LIST/DIAGRAM - CRANKCASE
PART DESCRIPTION QTY PART DESCRIPTION QTY
Washer 2
2 2
4 Seal 2
5
6 Crankcase Carbon Irrigation
8 Washer 2 Carbon Irrigation Connector
Fuel Pipe
IMPORTANT
When ordering parts from the above Parts list, make sure to specify the following:
The MODEL NUMBER (either 66525 or 66524) of the Engine for which you are ordering.1.
The PART NUMBER listed to the left of the part description.2.
The NAME OF THE PARTS LIST from which you are ordering (located at the top of this page).3.
SKU 66524-66525 For technical questions, please call 1-800-444-3353.
PARTS LIST/DIAGRAM - CRANKCASE COVER
PART DESCRIPTION QTY PART DESCRIPTION QTY
Washer 2
2 Sliding Sleeve
Seal
4 Crankcase Cover 2
5
6
Pin 2
8
2
20
IMPORTANT
When ordering parts from the above Parts list, make sure to specify the following:
The MODEL NUMBER (either 66525 or 66524) of the Engine for which you are ordering.1.
The PART NUMBER listed to the left of the part description.2.
The NAME OF THE PARTS LIST from which you are ordering (located at the top of this page).3.
SKU 66524-66525 For technical questions, please call 1-800-444-3353.
PARTS LIST/DIAGRAM - CYLINDER HEAD/CYLINDER HEAD COVER
IMPORTANT
When ordering parts from the above Parts list, make sure to specify the following:
The MODEL NUMBER (either 66525 or 66524) of the Engine for which you are ordering.1.
The PART NUMBER listed to the left of the part description.2.
The NAME OF THE PARTS LIST from which you are ordering (located at the top of this page).3.
PART DESCRIPTION QTY PART DESCRIPTION QTY
2 Washer 2
4 Set Pin 2
5
6
4 2
8 Circlip
Seal
20
SKU 66524-66525 For technical questions, please call 1-800-444-3353.
PARTS LIST/DIAGRAM - CRANKSHAFT, PISTON, CONNECTING ROD
IMPORTANT
When ordering parts from the above Parts list, make sure to specify the following:
The MODEL NUMBER (either 66525 or 66524) of the Engine for which you are ordering.1.
The PART NUMBER listed to the left of the part description.2.
The NAME OF THE PARTS LIST from which you are ordering (located at the top of this page).3.
PART DESCRIPTION QTY PART DESCRIPTION QTY
2
2
2
4 Expander Woodruff Key
5 Crankshaft
6 Piston Pin Circlip 2
Piston
8 Piston Pin
Shank 20
2
REV 10d
SKU 66524-66525 For technical questions, please call 1-800-444-3353.
PARTS LIST/DIAGRAM - CAMSHAFT, VALVE ROCKER
IMPORTANT
When ordering parts from the above Parts list, make sure to specify the following:
The MODEL NUMBER (either 66525 or 66524) of the Engine for which you are ordering.1.
The PART NUMBER listed to the left of the part description.2.
The NAME OF THE PARTS LIST from which you are ordering (located at the top of this page).3.
PART DESCRIPTION QTY PART DESCRIPTION QTY
2
2 Sleeve 2
2
4 2 2
5 Spring Keeper
6 2 Spring Keeper
2 Cap
8 Extension Spring 2
SKU 66524-66525 For technical questions, please call 1-800-444-3353.
PARTS LIST/DIAGRAM - CARBURETOR
IMPORTANT
When ordering parts from the above Parts list, make sure to specify the following:
The MODEL NUMBER (either 66525 or 66524) of the Engine for which you are ordering.1.
The PART NUMBER listed to the left of the part description.2.
The NAME OF THE PARTS LIST from which you are ordering (located at the top of this page).3.
PART DESCRIPTION QTY PART DESCRIPTION QTY
Choke Stem
2
4 Washer
5 20 2
6 Cover
22 Choke Switch
8 Float Throttle Unit
24
Float Chamber 25
Washer 2 26 Choke Unit
Float Chamber
Screw 28
Choke
SKU 66524-66525 For technical questions, please call 1-800-444-3353.
PARTS LIST/DIAGRAM - FUEL TANK
IMPORTANT
When ordering parts from the above Parts list, make sure to specify the following:
The MODEL NUMBER (either 66525 or 66524) of the Engine for which you are ordering.1.
The PART NUMBER listed to the left of the part description.2.
The NAME OF THE PARTS LIST from which you are ordering (located at the top of this page).3.
PART DESCRIPTION QTY PART DESCRIPTION QTY
Pipe 8 Filter Cup
2 Fuel Tank
Pipe Clamp 2
4 Connector Fuel Filler Cap
5 2
6 Plug-in board
2 2
Page 20
SKU 66524-66525 For technical questions, please call 1-800-444-3353.
PARTS LIST/DIAGRAM - AIR CLEANER
IMPORTANT
When ordering parts from the above Parts list, make sure to specify the following:
The MODEL NUMBER (either 66525 or 66524) of the Engine for which you are ordering.1.
The PART NUMBER listed to the left of the part description.2.
The NAME OF THE PARTS LIST from which you are ordering (located at the top of this page).3.
PART DESCRIPTION QTY PART DESCRIPTION QTY
2
2 8
Filler Element Washer
4 2
5
6
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