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Power Systems, Inc. 15
3.10 MAJOR SERVICE MANUAL
To obtain a service manual for your generator, con-
tact Generac or your nearest Generac Authorized
Service Dealer or, go to www.generac.com. Make sure
to identify your MODEL NUMBER and SERIES.
3.11 EXERCISING THE GENERATOR
Generac recommends that you start and operate the
generator at least once every seven days. Let
the unit run for at least 30 minutes to “exercise”
the engine.
3.12 OUT OF SERVICE PROCEDURE
3.12.1 REMOVAL FROM SERVICE
If you cannot exercise the generator every seven days,
and it is to be out of service longer than 30 days, pre-
pare the generator for storage as follows:
1. Start the engine and let it warm up.
2. Close the fuel shutoff valve in the fuel supply line
and allow the unit to shut down.
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.
3. While the engine is still warm from running,
drain the oil completely. Refill the crankcase with
SAE 10W-30 oil having API classification “For
Service SF.”
4. Attach a tag to the engine indicating the viscosity
and classification of the oil in the crankcase.
5. Remove the spark plug and pour two or three
tablespoons of clean, fresh engine oil into the
spark plug threaded openings. Reinstall and
tighten the spark plug.
6. Remove the battery and store it in a cool, dry
room on a wooden board. Never store the battery
on any concrete or earthen floor.
7. Clean and wipe the entire generator.
3.12.2 RETURN TO SERVICE
To return the unit to service after storage, proceed
as follows:
1. Check the tag on the engine for oil viscosity and
classification. Verify that the correct recommend-
ed oil is used in the engine (see Section 1.5.4,
Page 6). If necessary, drain and refill with the
proper oil.
2. Check the state of the battery. Fill all cells of
unsealed batteries to the proper level with distilled
water. DO NOT USE TAP WATER IN THE BAT-
TERY. Recharge the battery to 100 percent state of
charge, or, if defective, replace the battery.
3. Clean and wipe the entire generator.
4. Reconnect the battery. Observe battery polarity.
Damage may occur if the battery is connected
incorrectly.
5. Turn OFF all electrical loads. Add fuel if neces-
sary and then start the engine.
6. Allow the unit to run for several minutes to warm
up.
7. Apply electrical loads to at least 50 percent of the
unit’s rated wattage capacity.
8. When the engine is thoroughly warmed up, shut
it down.
9. Your generator is now ready for service.
3.13 ADJUSTING VALVE CLEARANCE
After the first 50 hours of operation, you should
adjust the valve clearance in the engine.
When adjusting valve clearance, the engine should be
at room temperature and the piston should be at Top
Dead Center (TDC) of its compression stroke (both
valves closed). Correct clearance is 0.001-0.003 inch
(0.03-0.07mm). Adjust valve clearance as follows:
1. Loosen the rocker arm jam nut. Use an allen
wrench to turn the pivot ball stud while checking
clearance between the rocker arm and the valve
stem with a feeler gauge (Figure 3.7).
Figure 3.7 — Adjusting Valve Clearance
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Section 3 – Maintenance
QUIETPACT 40G Recreational Vehicle Generator