Harbor Freight Tools 8750 Product manual
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.
REV 15a
Using a generator indoors CAN
Using an engine indoors
KILL YOU IN MINUTES.
CAN KILL YOU IN MINUTES.
Generator exhaust contains
Engine exhaust contains carbon monoxide.
carbon monoxide. This is a poison
This is a poison you cannot see or smell.
you cannot see or smell.
NEVER use inside
a home or garage,
NEVER use inside
EVEN IF doors and
windows are open.
a home or garage,
EVEN IF doors and
windows are open.
Only use OUTSIDE
and far away from
Only use OUTSIDE
windows, doors,
and far away from
and vents.
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© 2011 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.
Email our technical support at:
productsupport@harborfreight.com
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
Table of Contents
Safety ......................................................... 2
Setup .......................................................... 6
Specifications ............................................. 6
SAFETY OPERATION MAINTENANCESETUP
Operation ................................................... 10
This is the safety alert symbol. It is used to alert you to potential personal injury hazards.
Maintenance .............................................. 16
Parts List and Diagram .............................. 21
Warranty .................................................... 23
WARNING SYMBOLS AND DEFINITIONS
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.
IMPORTANT SAFETY INSTRUCTIONS
INSTRUCTIONS PERTAINING TO A RISK OF FIRE,
ELECTRIC SHOCK, OR INJURY TO PERSONS
WARNING – When using tools, basic precautions should always be followed, including the following:
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. All connections and conduits from the Generator
to the load must only be installed by trained and
licensed electricians, and in compliance with all
relevant local, state, and federal electrical codes and
standards, and other regulations where applicable.
6. Connections for standby power to a building
electrical system must be made by a qualified
electrician. The connection must isolate the
generator power from utility power, and must comply
with all applicable laws and electrical codes.
7. Wear ANSI‑approved safety goggles, heavy‑duty
work gloves, and dust mask/respirator during set up.
8. Use only lubricants and fuel
recommended in this manual.
Page 2
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Item 68525 68530
Set up Precautions (cont.)
9. Improper connections to a building electrical
system can allow electrical current from the
generator to backfeed into the utility lines. Such
backfeed may electrocute utility company workers
or others who contact the lines during a power
outage, and the generator may explode, burn, or
cause fires when utility power is restored. Consult
the utility company and a qualified electrician if
intending to use the generator for back up power.
Operating Precautions
1. CARBON MONOXIDE HAZARD
Using a generator indoors CAN KILL
YOU IN MINUTES.
Generator 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.
10. Do not operate the Generator before grounding.
The Generator must be earth‑grounded
in accordance with all relevant electrical
codes and standards before operation.
SAFETYOPERATIONMAINTENANCE SETUP
7. 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.
8. Do not touch engine during use. Let
engine cool down after use.
9. Never store fuel or other flammable
materials near the engine.
10. If the plugged in product operates abnormally
or unusually slow, immediately stop using the
generator as a power source. Always read and
adhere to the instruction manual of the product
to be powered, to make sure that it can be safely
and efficiently powered by a portable generator.
Only use OUTSIDE and far away from windows,
doors, and vents.
2. Never use a generator indoors, including in
garages, basements, crawlspaces and sheds.
Opening doors and windows or using fans will NOT
prevent carbon monoxide build up in the home.
3. When using generators, keep them outdoors
and far away from open doors, windows,
and vents to avoid toxic levels of carbon
monoxide from building up indoors.
4. If you start to feel sick, dizzy, or weak while
using a generator, get to fresh air right away.
The carbon monoxide from generators can
quickly lead to full incapacitation and death.
5. Keep children away from the equipment,
especially while it is operating.
6. Keep all spectators at least six feet
from the Engine during operation.
11. Before connecting an appliance or power cord
to the generator: Make sure that it is in good
working order. Faulty appliances or power cords
can create a potential for electrical shock.
12. Do not exceed the maximum power rating of the
generator. Make sure that the total electrical rating
of the all of the tools or appliances plugged into
the generator at the same time does not exceed
that of the generator. Check that the startup surge
will not be beyond the limit of the Generator.
Power levels between rated and maximum
may be used for no more than 30 minutes.
13. Avoid substantially overloading which will trip the
circuit breaker. Exceeding the time limit for maximum
power operation or slightly overloading the generator
may not switch the circuit breaker or circuit protector
OFF, but will shorten the service life of the generator.
14. Do not attempt to connect or disconnect
load connections while standing in
water, or on wet or soggy ground.
15. Do not touch electrically energized parts of
the Generator and interconnecting cables or
conductors with any part of the body, or with
any non‑insulated conductive object.
Item 68525 68530
For Generator technical questions, please call 1-888-866-5797.
Page 3
16. Connect the Generator only to a load or
electrical system (120 volt or 240 volt) that is
compatible with the electrical characteristics
and rated capacities of the Generator.
17. Insulate all connections and disconnected wires.
SAFETY OPERATION MAINTENANCESETUP
18. Guard against electric shock. Prevent body
contact with grounded surfaces such as
pipes, radiators, ranges, and refrigerators.
29. 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.
30. 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.
19. Only use a suitable means of transport and
lifting devices with sufficient weight bearing
capacity when transporting the generator.
20. Secure the Generator on transport vehicles to
prevent the tool from rolling, slipping, and tilting.
21. Industrial applications must follow
OSHA requirements.
22. Do not leave the Generator unattended when it is
running. Turn off the Generator (and remove safety
keys, if available) before leaving the work area.
23. The Generator 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.
24. Wear ANSI‑approved safety glasses,
hearing protection, and NIOSH‑approved
dust mask/respirator during use.
25. 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.
31. Parts, especially exhaust system components,
get very hot during use. Stay clear of hot parts.
32. Do not cover the generator or its
engine during operation.
33. Keep the generator, its engine, and
surrounding area clean at all times.
34. Use the generator, 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.
35. Do not operate the generator with known
leaks in the engine’s fuel system.
36. WARNING: This product contains or, when
used, produces a chemical known to the State
of California to cause cancer and birth defects
or other reproductive harm. (California Health
& Safety Code § 25249.5, et seq.)
37. WARNING: This product contains di (2‑ethylhexyl)
phthalate (DEHP), a chemical known to the State
of California to cause cancer and birth defects
or other reproductive harm. (California Health
& Safety Code § 25249.5, et seq.)
26. 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.
27. 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.
28. Keep grounded conductive objects, such as
tools, away from exposed, live electrical parts
and connections to avoid sparking or arcing.
These events could ignite fumes or vapors.
38. 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.
39. Keep hands and feet away from moving parts. Do
not reach over or across generator while operating.
40. Before use, check for misalignment or binding
of moving parts, breakage of parts, and any
other condition that may affect the generator’s
operation. If damaged, have the generator
serviced before using. Many accidents are
caused by poorly maintained equipment.
41. Use the correct generator for the application. Do not
modify the generator or its engine, and do not use the
generator for a purpose for which it is not intended.
Page 4
For Generator technical questions, please call 1-888-866-5797.
Item 68525 68530
Service Precautions
1. Before service, maintenance, or cleaning:
a. Unplug all devices from the generator.
b. Turn the engine switch to its “OFF” position.
c. Allow the engine to completely cool.
d. 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. Make sure the Engine Switch is in its “OFF”
position before moving the Generator and
before performing any service, maintenance,
or cleaning procedures on the unit.
4. Keep all electrical equipment clean and dry.
Replace any wiring where the insulation is
cracked, cut, abraded, or otherwise degraded.
Replace terminals that are worn, discolored, or
corroded. Keep terminals clean and tight.
5. 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.
6. Wear ANSI‑approved safety goggles, heavy‑duty
work gloves, and dust mask/respirator during service.
7. Maintain labels and nameplates on
the equipment. These carry important
information. If unreadable or missing, contact
Harbor Freight Tools for a replacement.
8. 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.
9. Store equipment out of the reach of children.
10. Follow scheduled engine and
equipment maintenance.
Refueling:
1. Do not smoke, or allow sparks, flames,
or other sources of ignition around the
equipment, especially when refuelling.
2. Do not refill the fuel tank while the
engine is running or hot.
3. TO PREVENT FUEL LEAKAGE AND FIRE
HAZARD, Do not overfill with fuel. Fill with
fuel according to the Fuel Level information
below the Specification chart for your model.
4. Do not fill fuel tank to the top. Leave a little
room for the fuel to expand as needed.
5. Refuel in a well‑ventilated area only.
6. Wipe up any spilled fuel and allow excess
to evaporate before starting engine. To
prevent FIRE, do not start the engine
while the smell of fuel hangs in the air.
SAVE THESE
SAFETYOPERATIONMAINTENANCE SETUP
Item 68525 68530
INSTRUCTIONS.
For Generator technical questions, please call 1-888-866-5797.
Page 5
Functional Description
Specifications
SAFETY OPERATION MAINTENANCESETUP
Generator
Engine
Item 68525 ‑ The emission control system for this Generator’s Engine is warranted for standards set by the U.S.
Environmental Protection Agency and by the California Air Resources Board (also known as CARB). For warranty
information, refer to the last pages of this manual.
Item 68530 ‑ The emission control system for this Generator’s Engine is warranted for standards set by the U.S.
Environmental Protection Agency. For warranty information, refer to the last pages of this manual.
Output
Battery needed for electric start
(not included)
Electrical Receptacle
Displacement 420cc
Engine Type Horizontal Single Cylinder 4 stroke OHV
Cooling System Forced air cooled
Fuel
Engine Oil
Run Time @ 50% load 12 hr.
Operational Volume 76 dB
Available accessories Wheel kit (sold separately)
Type 87+ octane stabilizer treated unleaded gasoline
Capacity 6.6 Gallons (25L)
Type SAE
Capacity 1.16 Quart (1.1L)
120/240VAC, 60Hz
7,000 Running Watts (8750 Peak Watts)
12V, lead acid, 9Ah
Two 3‑Prong, duplex NEMA #5‑15 120V
One 3‑Prong, NEMA #L5‑20 twistlock 120V
One 4‑Prong, NEMA #L14‑30 twistlock 120V/240V
One DC Outlet 12VDC
10W‑30 above 32° F
5W‑30 at 32° F or below
Components and Controls
Fuel Cap
Fuel Valve
Choke
Air Filter
Frame
Starter
Handle
DC Receptacle
DC Circuit Breaker
AC Circuit Breakers
AC Receptacles
Ground Terminal
Power Switch
Low Oil Indicator
Page 6
For Generator technical questions, please call 1-888-866-5797.
Item 68525 68530
Components and Controls (cont.)
The following are descriptions of the controls
on the power panel. Your generator has
sockets to power your products with circuit
breakers to protect the voltage flow.
START
I
O
1.
Engine Switch: Used to start and stop the Engine.
2. AC Receptacles: The Generator contains several
AC Receptacles to power tools and equipment.
a. 3-Prong, duplex
120 volt receptacle
(NEMA #5-15)
ON
OFF
3.
Circuit Breakers: The circuit breaker protects the
Generator from overloading. The rating of the breaker
and the load it protects are marked near the breaker.
Should any of the Circuit Breakers trip, the Generator
will stop the electricity output. If this happens, unplug
all loads from the Generator. Allow the Generator to
cool down. Then, press the tripped Circuit Breaker,
restart the Engine, and re‑attach loads.
4. 12 VDC Receptacle: 12 VDC Receptacle provides a
power source for 12 volt DC items.
5. Grounding Terminal: Prior to each use, set
up the ground wire (not included) connection
to the Grounding Terminal to properly ground
the Generator. See Set up instructions
to properly ground the Generator.
SAFETYOPERATIONMAINTENANCE SETUP
b. 3-Prong, twistlock,
120 volt receptacle
(NEMA #L5-20)
c. 4-Prong, twistlock,
120/240 volt receptacle
(NEMA #L14-30)
WARNING! Connect tools and equipment
only to the Receptacle (120 volt or 240 volt)
that is compatible with the electrical
characteristics and rated capacities of the
tools and equipment being used.
Item 68525 68530
For Generator technical questions, please call 1-888-866-5797.
Page 7
Initial Tool Set Up/Assembly
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 OPERATION MAINTENANCESETUP
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, 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.
Battery Setup Instructions
All Generators can be started using the recoil method. This generator requires installation of a
battery to operate the electric start feature. Connect the battery to the generator engine:
1. Place a fully charged, lead‑acid 12 V, 9 Ah battery (not included) in the battery holder on the generator.
2. Bolt in place using the hardware included with the battery.
3. Attach the positive (red) cable connector from the engine to the Positive Terminal
on the battery. Connect cable securely to prevent disconnection and short circuits.
4. Attach the negative (black) cable connector to the negative battery terminal.
Positive
Connector
Grounding
The Generator must be properly grounded before use. Have the unit grounded
by a qualified electrician if you are not qualified to do so.
To ground the Generator, connect a #6 AWG grounding wire (not included) from the
Grounding Terminal on the Control Panel to a grounding rod (not included) that has been
driven at least 24 inches deep into the earth. The grounding rod must be an earth‑driven
copper or brass rod (electrode) which can adequately ground the Generator.
CAUTION: This generator is not intended to power sensitive electronic equipment without the addition of an
appropriate line conditioner and surge protector (both not included). Sensitive electronic equipment includes,
but is not limited to, audio/video equipment, some television sets, computers, and printers. Sensitive
electronic equipment should be operated on approved inverter type generators or pure sine wave generators.
Note: For additional information regarding the parts listed in the following pages,
refer to the Assembly Diagram near the end of this manual.
Negative
Connector
Battery
Hardware
Note: Wheel Kit, item # 68531 (sold separately) can be used with this generator.
Page 8
For Generator technical questions, please call 1-888-866-5797.
Item 68525 68530
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