Guardian GTV/GTH-990/760 OHVI series, GTH-990 Series, GTH-760 Series, GTV-990 Series, GTV-760 Series Owner's Manual
Owner’s
Manual
• SAFETY
• ASSEMBLY
• OPERATION
• TROUBLESHOOTING
• PARTS
• WARRANTY
GTV/GTH-990/760
AUTHORIZED DEALER SUPPORT:
SERIES ENGINES
1-800-333-1322
THIS SYMBOL POINTS OUT IMPORTANT SAFETY INSTRUCTIONS, WHICH, IF NOT FOLLOWED,
COULD ENDANGER THE PERSONAL SAFETY AND/OR PROPERTY OF YOU AND OTHERS. READ AND
FOLLOW ALL INSTRUCTIONS IN THE MANUAL BEFORE ATTEMPTING TO OPERATE THIS UNIT.
SERVICE INFORMATION
Service on this engine within and after the warranty
period can be performed by any authorized service
dealer. Service technicians are factory trained and
capable of handling all service needs.
When contacting an authorized service dealer about
parts and service, always supply the complete model
number and serial number of your unit as given on its
data plate decal. See the illustration below for the
location of the decal.
The warranty for this engine is included in the owner’s
manual.
This engine meets the U.S. EPA and California
emissions regulations. To ensure that your
engine continues to meet these regulations,
refer to the following information and
instructions in this owner’s manual.
2
TABLE OF CONTENTS
GENERAL INFORMATION
Service Information ..................................................................2
Engine Identification Decal Location ........................................2
Oil and Fuel Information............................................................3
Engine Emission Compliance Period ........................................3
SAFETY
Rules for Safe Operation ..........................................................4
Before Operating ......................................................................4
While Operating ........................................................................5
OPERATION & MAINTENANCE
Before Starting the Engine ........................................................6
Starting the Engine ................................................................6-7
Stopping the Engine..................................................................7
Low Pressure Shutdown System ..............................................7
Restarting the Engine................................................................7
Maintenance Schedule..............................................................7
MAINTENANCE
General Maintenance Recommendations ................................8
Service and Adjustments ........................................................10
Carburetor Adjustments ..........................................................10
Adjusting Valve to Rocker Arm Clearance..............................11
Storage Instructions ................................................................11
Product Specifications ............................................................11
Oil Capacities ..........................................................................11
Service Parts ..........................................................................12
Troubleshooting ......................................................................12
Notes ......................................................................................13
WARRANTY
California Emission Control Warranty Statement....................15
Emission Control System Warranty ........................................16
Generac Engine Warranty ......................................................17
MAINTENANCE RECORD ..................................18
GTV/GTH - 990/760 OHVI SERIES ENGINES
OIL AND FUEL INFORMATION
NOTE: Be sure to read these instructions carefully before
attempting to start or operate this equipment. Using old or
improper oil or fuel can cause engine damage.
CAUTION: Any attempt to crank or start the engine
before it has been properly serviced with the
recommended oil may result in engine damage.
CAUTION: This engine is shipped from Generac Power
Systems without oil. Check oil level before starting Engine. If
you start the engine without oil, the engine will be damaged
beyond repair and will not be covered under warranty.
RECOMMENDED OIL TYPE
Using the proper type and weight of oil in the crankcase is
extremely important. Check the oil before each use and change
the oil regularly. Failure to use the correct oil, or using dirty oil,
can cause premature engine wear and failure.
Use only high quality detergent oil rated with API service
classification SF, SG or SH. The recommended oil weights
include the following:
• During summer months: SAE 30. An acceptable substitute is
SAE 10W-30. After first oil change, synthetic oil is
acceptable.
• During winter months: SAE 5W-30, Synthetic 5W-20 or 5W-
30. DO NOT USE SAE 10W-40.
See Oil Capacities chart (Page 11) for oil capacities. Use no
special additives. Make sure that the unit is level when filling
with oil. DO NOT OVERFILL.
RECOMMENDED BATTERY
Servicing of the battery is to be performed or supervised by
personnel knowledgeable of batteries and the required
precautions. Keep unauthorized personal away from batteries.
Use only 12 volt negative (-) ground batteries with a minimum
rating of 675 cold-cranking amps at -17.8C (0 F).
WARNING: Damage will result to the engine starter if a
battery rated less than 675 cold-cranking amps is used.
BATTERY CABLES
Using battery cables that are too long or too small in diameter
may cause a decrease in voltage which leads to a starting
problem due to voltage drop. Use a cable size “2” for length 0”
to 10 feet. See Figure A for battery cable connections.
RECOMMENDED FUEL TYPE
Use clean, fresh, regular UNLEADED gasoline with this
engine.
CAUTION: Do not overfill the fuel tank. Always
allow room for fuel expansion.
WARNING: Never fill the fuel tank indoors. or when
the engine is running or hot. Do not light a cigarette or
smoke when filling the fuel tank.
ENGINE EMISSION COMPLIANCE PERIOD
For non-hand held engines: The Emissions Compliance Period
referred to on the Emissions Compliance label indicates the
number of operating hours for which the engine has been
shown to meet Federal emission requirements.
For engines less than 225 cc displacement, Category
C = 125 hours, B = 250 hours, and A = 500 hours.
For engines 225 cc or more, Category C = 250 hours,
B = 500 hours, and A = 1000 hours.
C
-20
-10
10 20 30 40
100
806040200F -20
-30
Temperature Range of Expected Use
Synthetic 5W-20, 5W-30
10W-30, SAE 30
Battery
Positive(+)
Starter
Contactor
Typical Battery
Ground
Figure A - Battery Cable Connections
3
GTV/GTH - 990/760 OHVI SERIES ENGINES
If you do not understand any portion of this manual, contact
Generac or your nearest Generac Authorized Service Dealer
for starting, operating and servicing procedures.
Throughout this publication and on tags and decals affixed to
the engine, DANGER, WARNING and CAUTION blocks
are used to alert you to special instruction about a particular
operation that may be hazardous if performed incorrectly or
carelessly. Observe them carefully.
These safety warnings cannot eliminate the hazards that they
indicate. Strict compliance with the special instructions while
performing the service plus “common sense” are major
measures to prevent accidents.
The following definitions apply to DANGER, WARNING,
CAUTION and NOTE blocks found throughout the manual.
These safety symbols indicate the following:
DANGER: After this heading you can read handling,
installing, operating or servicing instructions that, if not
strictly complied with, will result in personal injury.
WARNING: After this heading you can read
handling, installing, operating or servicing instructions
that, if not strictly complied with, may result in personal
injury.
CAUTION: After this heading you can read
instructions for handling, installing, operating or
servicing the engine that, if not strictly complied with,
may result in damage to equipment and/or property.
NOTE: After this heading you can read explanatory
statements that require special emphasis.
These symbols indicate the following:
Points out important safety information that, if not
followed, could endanger personal safety and/or
property of yourself and others.
Potential explosion hazard.
Potential fire hazard.
Ꮨ Potential electrical shock hazard.
RULES FOR SAFE OPERATION
Study these RULES FOR SAFE OPERATION carefully
before operating or servicing this equipment. Become familiar
with the OWNER’S MANUAL and with the engine. The
engine can operate safely, efficiently and reliably only if it is
properly operated and maintained. Many accidents are caused
by failing to follow simple and fundamental rules or precautions.
Generac cannot possibly anticipate every possible circumstance
that might involve a hazard. The warnings in this manual and on
tags and decals affixed to the equipment, are therefore, not allinclusive. If you use a procedure, work method or operating
technique Generac does not specifically recommend, you must
satisfy yourself that it is safe for you and others. You must also
make sure the procedure, work method or operating technique
that you choose does not render the engine to be unsafe.
DANGER: Do not tamper with the engine governed
speed. High operating speeds are dangerous and
increase the risk of personal injury or damage to the
equipment. Operating at low speeds with heavy load may
shorten the engine’s life.
BEFORE OPERATING
• Gasoline is highly FLAMMABLE and its vapors are
EXPLOSIVE. Do not permit smoking, open flames,
sparks or heat in the area while handling gasoline. Avoid
spilling gasoline on a hot engine. Comply with all of the
laws regulating storage and handling of gasoline.
• Store gasoline and other fuels only in containers
designed and approved for the storage of such
materials.
• Add gasoline in a clean, well-ventilated area. Wipe up
any spilled gasoline immediately.
If gasoline has been spilled, let it dry completely before
starting the engine.
The engine exhaust from this product contains
chemicals known to the State of California to cause
cancer, birth defects, or other reproductive harm.
WARNING:
4
GTV/GTH - 990/760 OHVI SERIES ENGINES
• Do not overfill the fuel tank. Always allow room for fuel
expansion. If the tank is overfilled, the fuel can flow onto a
hot
engine and cause a FIRE or an EXPLOSION.
• Allow at least two (2) feet of clearance on all sides of the
engine, even while operating it outdoors, or you could
damage the engine.
• Thoroughly inspect the engine for loose or damaged
parts before each use. Do not use the engine until
adjustments or repairs are made.
• Check the oil level in the engine before each use.
• Inspect the engine periodically. Repair or replace all
damaged or defective parts immediately.
• Inspect fuel system frequently for leaks or damage.
Repair or replace any damaged or leaking component
immediately. Never attempt to change, alter or modify
the engine fuel system in any way that might affect
safety or compliance with applicable codes and
standards.
WHILE OPERATING
• This engine was designed and manufactured for specific
applications. Do not attempt to modify the equipment or
use it for any application for which it was not designed.
• Generac Power Systems does not approve or authorize
the use of these engines on All Terrain Vehicles (ATV’s),
go-carts, motorbikes, aircraft products, personal
watercraft, or vehicles intended for use in competitive
events. Use of these engines in such applications could
result in property damage, serious injury (including
paralysis), or even death.
• Engine exhaust gases contain DEADLY carbon
monoxide gas. This dangerous gas, if breathed in
sufficient concentrations, can cause unconsciousness or
even death. Operate this equipment only in the open air
where adequate ventilation is available.
• Do not insert any object through the cooling slots of the
engine. You could damage the equipment or injure
yourself.
• Do not operate the engine faster than the speed
necessary to operate the equipment. Do not run the
engine at high speed when not operating the equipment.
• This engine requires an adequate flow of cooling air for its
continued proper operation. Never operate the equipment
inside any room or enclosure where the free flow of cooling
air into and out of the equipment might be obstructed.
Without sufficient cooling air flow, the engine quickly
overheats, damaging the engine or nearby property.
• Do not smoke around the engine. Wipe up any fuel or oil
spills immediately. Never leave oily or fuel soaked rags
around the engine. Keep the area around the engine clean
and free of debris.
• Keep hands, feet, clothing, etc., away from moving parts of
this engine.
• Never operate the engine (a) in the rain; (b) in any enclosed
compartment; (c) if the engine speed changes; (d) if the
engine sparks; (e) if flame or smoke is observed while the
engine is running.
• Never work on this engine or handle any electrical device
while standing in water, while barefoot, or while hands or feet
are wet. DANGEROUS ELECTRIC SHOCK will
result.
5
GTV/GTH - 990/760 OHVI SERIES ENGINES
OPERATION AND MAINTENANCE
It is the owner’s/operator's responsibility to perform all safety
checks; to make sure that all maintenance for safe operation is
performed promptly; and to have the engine checked by an
authorized dealer periodically. Normal maintenance service and
replacement of parts are the responsibility of the
owner/operator and, as such, are not considered defects in
materials or workmanship within the terms of the warranty.
Individual operating habits and usage contribute to the need for
maintenance service.
Proper maintenance and care of your engine assures a
minimum number of problems and keeps your operating
expenses at a minimum. See your authorized dealer/distributor
for service aids and accessories.
BEFORE STARTING THE ENGINE
Perform the following tasks before trying to start the engine:
CHECKING AND ADDING ENGINE OIL
NOTE: When adding oil to the engine crankcase in the future,
use only high quality detergent oil rated with API service
classification SF or SG SAE 30 weight. Use no special
additives.
Select the oil’s viscosity grade according to the expected
operating temperature. Do not use SAE 10W-40.
• Above 40°F, use SAE 10W-30 or SAE 30.
• Below 40°F, use synthetic 5W-20 or 5W-30.
Check your engine oil level frequently to avoid possible
damage from running low on oil.
• Place engine on a level surface.
• Clean area around oil fill and remove oil fill cap and
dipstick. (Figure 1 or figure 2)
• Wipe dipstick clean. Reinstall and check oil level on dipstick.
• Slowly fill engine with oil through the oil fill opening
until it reaches the full mark on the dipstick. Stop filling
occasionally to check oil level. DO NOT OVERFILL.
• Install dipstick. Install oil fill cap and finger tighten
securely.
• Check engine oil level before starting each time thereafter.
ADDING FUEL
1. Fill the fuel tank using clean, fresh regular UNLEADED
gasoline.
STARTING THE ENGINE
1. Open the fuel shut-off valve, (if equipped).
2. Move choke control to CHOKE or START Position.
3. Push throttle to FAST position (if equipped). Operate the
engine with the throttle in FAST position.
4. Turn key to START position (hold until engine starts, but
not more than 5 seconds). To prevent damage to starter,
allow starter to cool for one minute between attempting to
restart.
5. A) If the engine FAILS TO START, go to Step 6.
B) If the engine STARTS, go to Step 7.
6. Push the choke lever to the HALF CHOKE
POSITION. Repeat step 4
• If the engine STILL FAILS TO START, repeat
Steps 1-5.
OPERATION
Figure 1 - Oil Fill Check
6
FILL/
CHECK
DRAIN
CHECK
FILL
Figure 2 - Oil Check and Oil Fill
GTV/GTH - 990/760 OHVI SERIES ENGINES
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