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Generac
®
Power Systems, Inc. 15
MAINTENANCE PERFORMED BY
AUTHORIZED SERVICE FACILITIES
A. EVERY THREE MONTHS
1.Check battery state of charge and condition.
2.Inspect and test fuel system.
3.Check transfer switch.
4.Inspect exhaust system.
5.Check engine ignition system.
6.Check fan belts.
B. ONCE EVERY SIX MONTHS
1.Test Engine Safety Devices (low oil pressure, low
coolant level, high coolant temperature).
C. ONCE ANNUALLY
1.Test engine governor; adjust or repair, if needed.
2.Clean, inspect generator.
3.Flush cooling system.
D. FIRST 100 OPERATING HOURS
1.Change engine oil and oil filter. (After initial change,
service engine oil and filter at 150 operating hours
or 6 months, whichever comes first.)
2.Retorque cylinder head. (See Torque Specs, page 7.)
3.Retorque intake and exhaust manifold. (See Torque
Specs, page 7.)
E. EVERY 500 OPERATING HOURS
1.Service air cleaner.
2.Check starter.
3.Check engine DC alternator.
F. EVERY 800 OPERATING HOURS
1.Retorque cylinder head. (See Torque Specs, page 7.)
2.Retorque intake and exhaust manifold. (See Torque
Specs, page 7.)
3.Check engine compression.
4.Check valve clearance.
OVERLOAD PROTECTION FOR ENGINE DC
ELECTRICAL SYSTEM
Engine cranking, start up and running are controlled by
a solid state Engine Controller circuit board. Battery
voltage is delivered to that circuit board via a 30 amp
fuse. These overcurrent protection devices will open if
the circuit is overloaded.
CAUTION! If a circuit breaker opens or a fuse
element melts, you should find the cause of the
overload before resetting the circuit breaker or
replacing the fuse.
CHECKING FLUID LEVELS
CHECK ENGINE OIL
Check engine crankcase oil level (Figure 11) at least
every 20 hours of operation, or prior to use.
• Remove oil dipstick and wipe dry with a clean,
lint-free cloth.
• Install oil dipstick, then remove again.
• Oil should be between FULL and ADD marks.
• If oil level is below the dipstick ADD mark, remove oil
fill cap. Add the recommended oil to bring oil level
up to the FULL mark. DO NOT FILL ABOVE THE
“FULL” MARK. See page 6 for recommended oils.
Figure 11 - Oil Dipstick and Oil Fill Cap
c
ap
BATTERY FLUID
Check battery electrolyte fluid at least once weekly.
Fluid should cover separators in all battery cells. If
fluid level is low, add distilled water to cover tops of sep-
arators. DO NOT USE TAP WATER IN BATTERY.
ENGINE COOLANT
Check coolant level in coolant recovery bottle. See
Specifications, page 8
• Add recommended coolant mixture as necessary.
• Periodically remove radiator pressure cap to make
sure the coolant recovery system is functioning
properly. Coolant should be at bottom of radiator
filler neck. If coolant level is low, inspect gasket in
radiator pressure cap. Replace cap, if necessary. To
have pressure cap tested, contact an authorized
Generac Service Facility. Inspect cooling system and
coolant recovery system for leaks.
OIL FILL CAP
OIL DIPSTICK
Section 4 — Maintenance
Guardian Liquid-cooled 10 kW, 15 kW, 20 kW and 25 kW Generators