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12 Generac
®
Power Systems, Inc.
Section 3 – Maintenance
IMPACT-36 plus II Recreational Vehicle Generator
Do NOT use a forceful spray of water to clean
the generator. Water will enter the generator
interior and cause problems, and may also
contaminate the generator fuel system.
3.10 BATTERY
All lead-acid storage batteries will discharge when
not in use. Inspect the generator battery as follows:
3.10.1 ONCE WEEKLY
Inspect battery posts and cables for tightness, corro-
sion. Clean and/or tighten as necessary.
Also check battery fluid level, and, if necessary, fill
with DISTILLED WATER ONLY. DO NOT USE TAP
WATER IN BATTERY.
3.10.2 EVERY SIX MONTHS
Have the battery state of charge and condition
checked by an automotive service facility. This should
be done with an automotive type battery hydrometer.
Storage batteries give off explosive hydrogen
gas. This can form an explosive mixture
around the battery for several hours after
charging. The slightest spark can ignite the
gas and cause an explosion. Such an explo-
sion can shatter the battery and cause blind-
ness or other injury. Any area that houses a
storage battery must be properly ventilated.
Do not allow smoking, open flame, sparks or
any spark producing tools or equipment near
the battery.
Battery electrolyte fluid is an extremely caus-
tic sulfuric acid solution that can cause severe
burns. Do not permit fluid to contact eyes,
skin, clothing, painted surfaces, etc. Wear pro-
tective goggles, protective clothing and
gloves when handling a battery. If fluid is
spilled, flush the affected area immediately
with clear water.
Do not use any jumper cables or booster bat-
tery to crank and start the generator engine.
If any battery has discharged, remove it from
the vehicle for recharging.
3.11 SERVICE AND ADJUSTMENTS
3.11.1 ENGINE SPEED
Engine speed is completely computer-controlled.
There is no adjustment for speed on the unit. The
computer adjusts the engine speed using an electron-
ic governor throttle control. The computer monitors
the demand for power and adjusts the engine speed
accordingly. This allows the engine to produce only
the power required, resulting in fuel economy as well
as lowering the overall noise emitted.
NOTE:
The computer will disable the electrical load
capabilities of the generator and enter a fault con-
dition if the throttle is accelerated manually or
any other way.
3.12 ADJUSTING THE CARBURETOR
The carburetor of the generator is preset at the facto-
ry. The carburetor should not be tampered with, as
this will void the emission control system warranty. If
the generator is used at altitudes in excess of 5,000
feet, consult the Generac Authorized Service Facility
regarding high altitude jetting changes.
3.13 ADJUSTING VALVE CLEARANCE
After the first 50 hours of operation, 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 3.8).
Figure 3.8 — Adjusting Valve Clearance
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