8 Scheduled Maintenance TP-5977 7/98
10. Start generator set and check for oil leaks.
11. Stop generator set. Check oil level. Add oil as
necessary to bring oil level up to MAX mark.
NOTE
Too high an oil level causes high oil consumption and
engine carbonizing. Too low a level damages the
engine.
NOTE
Donotpollutetheenvironment. Disposeofusedengine
oilandother contaminantsin a safe, approvedmanner.
3.2.4 Oil Filter Change
Replace the oil filter at the interval specified in the
service schedule. Change the oil filter more frequently
under dirty, dusty conditions. Refer to the following
procedure. See Section 1—Service Views for oil filter
location.
Oil Filter Change Procedure
1. Loosen the oil filter by turning it counterclockwise.
Remove the oil filter and use rags to clean up
spilled oil. Dispose of the oil filter in an approved
manner.
2. Clean contact surface of the oil filter adapter.
3. Lightlylubricatethe gasket surfaceofthenewfilter
with fresh engine oil. Thread filter onto adapter
until gasket makes contact; hand-tighten an
additional one-half turn. Wash hands after any
contact with engine oil.
If alsoperforminganoilchange,skipsteps4-5and
return to oil change procedure.
4. Start generator set and check for oil leaks.
5. Stop generator set. Check oil level. Add oil as
necessary to bring oil level up to MAX mark.
3.3 Gasoline Fuel System
The generator set can be equipped with one of four
differentfuelsystems:gasoline,straightgas(LP/natural
gas),gas/gasoline,andliquidwithdrawal. Thefollowing
sections discuss each of the fuel systems.
3.3.1 Fuel Specifications—Gasoline
For best results, use only clean, fresh regular grade
unleaded gasoline with a pump sticker rating of
87 octaneorhigher intheU.S.A. Incountries usingthe
research rating method use 90 octane minimum.
Use unleaded gasoline because it leaves fewer
combustion chamber deposits. Regular grade leaded
gasoline may be used; however, be aware the
combustion chamber and cylinder head will require
morefrequentservice. Usegasoholcontainingnomore
than 10% ethanol if unleaded gasoline is unavailable.
Neverusegasoholcontainingmorethan10%ethanolor
gasoline containing Methanol. Do not mix oil with fuel.
Usefresh,cleangasolineto ensurethat it isblendedfor
theseasonandtoreducethepossibilityofgumdeposits
forming which could clog the fuel system. Do not use
gasoline left over from the previous season.
3.3.2 Fuel Filter (Gasoline)
Clean/replace the gasoline fuel filter at the interval
specified in the service schedule. Service more
frequently if rough operation suggests a clogged fuel
filter. Somemodelsuseanin-linefuelfilterwhichcannot
be cleaned and requires replacement. Other models
have a fuel pump with an integral fuel filter which
requires cleaning at the specified interval.
3.4 Gaseous Fuel System
The gaseous fuel system utilizes a fuel valve (with
solenoid) to control the fuel flow to the fuel regulator.
The generator-mounted regulator reduces fuel
pressure as fuel passes to the carburetor. See
Figure 3-4. The carburetor (mixer) controls the ratio of
fuel to air under varying loads and speed conditions.
Because the carburetor receives fuel in a gaseous
state,itdoesnothavetoprovidevaporizationofthefuel.
Whenswitchingfrom naturalgas to LP gas or LP gasto
natural gas, verify that engine speed meets
specifications. If the engine speed is incorrect, refer to
the Generator Set Service Manual.
TP-5750-3
1
2
1. Gas fuel regulator
2. Gas fuel valve
Figure 3-4. Fuel Regulator and Valve
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