Generac Power Systems GTH760, Service Manual

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SeCTIoN 1: GeNerAl INForMATIoN
MAINTeNANCe SCHedule
Every
8 Hours or
Daily
Every
25 Hours
Season
Every
50 Hours
Season
Every
100 Hours
Season
Check Oil Level •
Change Oil Note 1
Change Oil Filter Note 1
Service Air Filter
Foam
Pre-Filter
if equipped
Filter
(Note 2)
Replace or Clean
Spark Plug •
Clean Spark
Arrestor Screen •
Valve Clearance
Note 3
nOTe 1:
Change oil and filter after first 8 hours of operation and then
every 100 hours thereafter. Change sooner when operating under a heavy
load or in a dusty or dirty environment or in high ambient temperature.
nOTe 2:
Clean more often when operating in dirty or dusty conditions.
Replace canister style filter every 500 hours.
nOTe 3:
Check valve lash and adjust if necessary after first 50 hours of
operation and every 100 hours thereafter.
Fuel ANd oIl reCoMMeNdATIoNS
GASOLINE:
We recommend the use of clean, fresh lead-free gasoline.
A minimum of 85 octane is recommended. The use of lead-
free gasoline results in fewer combustion deposits and longer
valve life.
NOTE: Using a fuel additive such as STA-BIL® fuel stabi-
lizer, or an equivalent, will prevent gum deposits from
forming in the engine’s fuel system.
NOTE: Some fuels, called oxygenated or reformulated
gasolines, are gasolines blended with alcohols, ethers or
ethanol. Excessive amounts of these blends can damage
the fuel system or cause performance problems. Do not
use gasoline which contains Methanol. If any undesir-
able operating symptoms occur, use gasoline with a
lower percentage of alcohol, ether or ethanol.
It is also recommended that gasoline be purchased in small
quantities, not more than a 30 day supply. FRESH gasoline
minimizes gum deposits, and also will ensure fuel volatility
tailored for the season in which the engine will be operated.
LUBRICATION:
Oil has four purposes. It cools, cleans, seals and lubricates.
During normal operation, small particles of metal from the
cylinder walls, pistons, bearings and combustion deposits will
gradually contaminate the oil. Dust particles from the air also
contaminate the oil forming an abrasive mixture which can
cause wear to all of the internal moving parts of the engine, if
the oil is not changed regularly. Fresh oil also assists in cooling.
Old oil gradually becomes thick and loses its cooling ability as
well as its lubricating qualities.
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 (see Figures 1-1 through 1-5). 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 an API service
classification SJ or higher (example: SL or SM). Do NOT use oil
designated "for diesel engines only" (example: CD).
The recommended oil weights include the following:
• During summer months: SAE 30. An acceptable substi-
tute is SAE 10W-30. After first oil change, synthetic oil is
acceptable.
• During winter months: SAE 5W-30 or synthetic 5W-30. DO
NOT USE SAE 10W-40. After first oil change, synthetic oil
is acceptable.
CHANGE OIL:
See "Section 14: Specifications" for crankcase oil capacities.
Use no special additives. Make sure that the unit is level when
filling with oil. DO NOT OVERFILL.
IMPORTANT: DO NOT OVERFILL. Check and maintain oil
level regularly. Change oil and filter after first eight (8)
hours of operation.
Thereafter, change oil and filter every 100 hours of opera-
tion. Change oil more often if engine is operated in dirty or
dusty conditions or if engine is operated under heavy loads or
in high ambient air temperatures.
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