7-1
Section 7. General Maintenance
Follow a regular schedule of inspection and servicing,
based on operating hours. Keep an accurate record of
maintenance, service, and operating time. Use the run-
ning time meter (optional) to monitor operating hours.
Follow the service schedule listed in the Periodic Mainte-
nance Schedule on page 8-1.
Many maintenance procedures present
hazards which can result in severe personal injury or
death. Only qualified service personnel with knowl-
edge of fuels, electricity, and machinery hazards
should perform service procedures. Review the
safety precautions on the inside cover page of this
manual.
PERIODIC CHECKS
1. Check all fuel and oil lines for possible leakage.
2. Inspect exhaust lines and mufflers for possible leak-
age and cracks.
3. Periodically drain moisture from condensation
traps.
4. Inspect the cooling system. Be sure the cooling fins
are clean.
5. Inspect electrical wires and connections to see they
are secure and have no fray damage.
If the generator requires major repair or servicing, contact an
authorized Onan service center.
Inadvertently starting the engine may
result in damage to the generator set or serious per-
sonal injury. For this reason, disconnect the batter-
ies, negative (-) cable first, before beginning any
maintenance work on the engine, generator, control
panel, automatic transfer switch or associated wir-
ing.
BATTERIES
Check the condition of the starting batteries at least every
two weeks. Make certain that connections are clean and
tight. A light coating of non-conductive grease will retard
corrosion at terminals. Add distilled water t o keep the
electrolyte at the proper level above the plates. Check
the specific gravity; recharge if below 1.260 at 77
°
F
(25
°
C).
Batteries present the hazard of explo-
sion, which can result in severe personal injury. Dis-
connecting battery cables from the battery while the
generator set is cranking or running causes arcing.
For this reason, do not disconnect battery cables
from the battery while the generator set is cranking
or running. To avoid excessive arcing, always dis-
connect the negative (-) cable first, and connect it
last.
Discharged batteries are subject to se-
vere damage if exposed to freezing temperatures.
Store all batteries in a fully charged condition, and
maintain their charge during storage.
FUEL FILTERS
Every 100 hours, open the drains on the bottom of the
fuel filter assembly (Figure 7-1) and allow any water to
escape. The drain plug on the fuel filter can tolerate only
a limited amount of torque. Use two wrenches in combi-
nation for breaking the plug loose and for final tightening.
Fuel presents the hazard of fire or ex-
plosion which can cause severe personal injury or
death. Do not permit any flame, spark, pilot light,
cigarette, arc-producing equipment or other ignition
source near the fuel system. Keep an ABC type fire
extinguisher nearby.
FIGURE 7-1. DUAL FUEL FILTERS
FS1113
ELBOW (TO
INJECTION
PUMP)
SECONDARY
FILTER
DRAIN
PRIMARY
FILTER
DRAIN
CONNECTOR
(FROM FUEL
TRANSFER
PUMP)
