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14 Generac
®
Power Systems, Inc.
ENGINE HEATER
Your Generac standby generator comes equipped with a
block heater (Figure 4.1), similar to the block heaters
used in automotive applications. The block heater is
wired to a grounded plug.
Figure 4.1 - Engine Block Heater
Refer to applicable wiring diagram(s) and electrical
schematic(s) at back of manual for wiring connections.
Customer supplies a 120V 15A Utility fed circuit for the
block heater.
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.
COOLING SYSTEM
Air intake and outlet openings in the generator com-
partment must be open and unobstructed for continued
proper operation. This includes such obstructions as
high grass, weeds, brush, leaves and snot.
Without sufficient cooling and ventilating air flow, the
engine/generator quickly overheats, which causes it to
shut down. (See Section 9 for installation drawings and
vent locations.)
The exhaust system parts from this product get
extremely hot and remains hot after shutdown.
High grass, weeds, brush, leaves, etc. must remain
clear of the exhaust. Such materials may ignite
and burn from the heat of the exhaust system.
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.
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 4.2) 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.
Section 4 — Maintenance
Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators