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16 Generac
®
Power Systems, Inc.
Section 4 — Maintenance
Centurion Liquid-cooled 15 kW and 25 kW Generators
Figure 4.1 - Oil Dipstick and Oil Fill Cap
4.4.2 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
separators. DO NOT USE TAP WATER IN BATTERY.
4.4.3 ENGINE COOLANT
Check coolant level in coolant recovery bottle. See
Section 1.10, Specifications.
• 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 Dealer. Inspect cooling system
and coolant recovery system for leaks.
4.5 MAINTENANCE OWNER/
OPERATOR CAN PERFORM
4.5.1 CHECK ENGINE OIL LEVEL
Refer to “Checking Fluid Levels”, Section 4.4.
4.5.2 CHECK BATTERY
• Check battery fluid level each week as outlined
under “Checking Fluid Levels”, Section 4.4.
• Check battery cables for condition, tightness,
corrosion or damage. Clean, tighten or replace as
necessary.
4.5.3 EXERCISE SYSTEM
Start the generator engine at least once every seven
days and let it run at least 20 minutes. See Section
3.5, “Weekly Exercise Cycle”.
4.5.4 INSPECT COOLING SYSTEM
• Inspect engine cooling system at least once each
month.
• Check hoses for damage, deterioration, leaks, etc.
Correct any discrepancies found.
• Check hose clamps for tightness.
• Check fluid levels as outlined above.
4.5.5 PERFORM VISUAL INSPECTION
Complete a thorough visual inspection of the entire
generator monthly. Look for obvious damage, loose,
missing or corroded nuts, bolts and other fasteners.
Look for fuel, oil or coolant leaks.
4.5.6 INSPECT EXHAUST SYSTEM
Inspect the exhaust system at least once every three
months. Check all exhaust system pipes, mufflers,
clamps, etc. for condition, tightness, leaks, security,
damage.
4.5.7 CHECK FAN BELT
• Inspect fan belts every three months. Replace any
damaged, deteriorated, worn or otherwise
defective belt.
• Check fan belt tension. Thumb pressure, exerted
midway between pulleys, should deflect about 3/8
to 3/4 inch. Adjust belt tension as required.
4.5.8 INSPECT ENGINE GOVERNOR
Visually inspect electronic governor.
Do not attempt to adjust the governor. Only
qualified service persons should adjust the
governor. Excessively high operating speeds
are dangerous and increase the risk of
personal injury. Low speeds impose a heavy
load on the engine when adequate engine
power is not available and may shorten
engine life. Correct rated frequency and
voltage are supplied only at the proper
governed speed. Some connected electrical
load devices may be damaged by incorrect
frequency and/or voltage. Only qualified
technicians should adjust the governed speed.
4.5.9 CHANGING ENGINE OIL
Refer to maintenance performed by authorized
service facilities for engine oil and filter change
frequencies.
Drain the oil while the engine is still warm from
running. This means warm up the engine, shut it
down and drain immediately as follows:
!
DANGER
OIL DIPSTIC
K