General Maintenance - Onan DYG Series Operator's Manual And Parts Catalog

GENERAL MAINTENANCE
GENERAL ~
Follow a definite schedule of inspection and ser-
vicingi based on operating hours (Table 6). Keep an
accurate logbook of maintenance, servicing, and
operating time. Use the running time meter (optional
equipment) to keep a record of operation and ser-
vicing. Service periods outlined below are
recommended for normal service and operating con-
ditions. For continuous duty, extreme temperature,
etc., service more frequently. For infrequent use, light
duty, etc., service periods can be lengthened accor-
dingly. Refer to Allis-Chalmers engine manual for
details of engine service and maintenance
procedures.
W A R N I N G
Before performing any maintenance work oh
the engine, generator, control panel,
automatic transfer switch or associated wiring, disconnect
batteries. Failure to do so could result in damage to the unit or
serious personal injury in the event of inadvertent starting.
E N G I N E S P E E D
Generatorfrequency is in direct ratio to engine speed,
which is controlled by the governor.
A Woodward SG governor is standard equipment on
the DYG generator set. High speed and low speed
limit stops are set at the ONAN testing facility and
normally do not require further adjustment, therefore
if your set is used on continuous standby service, the
governor may never need to be touched. If however
the unit is used frequently, adjustment may be
required due to wear of internal components. This
adjustment is achieved by backing o f f t h e high speed
stop screw. Screw in the low speed adjusting screw
until the generator output frequency meter reads 60
Hz (generator -on load). Turn in the high speed
adjusting screw until it bottoms; secure the locknuts.
Refer to Figure 27.
When using the generator frequency meter to deter-
mine engine speed, multiply frequency by 30 to
calculate engine speed.
Example: 30 x 61 (Hz) = 1830 rpm.
Adjust engine speed to 1800 rpm for 60 Hz sets and
1500 rpm for 50 Hz sets.
Engine crankcase oil flows through the governor. Dirty oil can
degrade governor operation.
LOW SPEED
ADJUSTING SCREW.
LOCK NUT.
TERMINAL
SHAFT
LOCK
NUT
HIGH SPEED
ADJUSTING
SCREW
FIGURE 27. WOODWARD GOVERNOR
DUST AND DIRT
1. Keep set clean. Keep cooling system free of dirt,
etc.
2. Service air cleaners frequently.
3. Store oil and fuel in dust-tight containers.
' 4. See engine operation and maintenance manual.
A C GENERATOR
There are no brushes, brush springs or collector rings
on these generators, therefore they require very little
seirvicing. Periodic inspections, to coincide with
engine oil changes, will ensure good performance. -
Generator Bearing: Inspect the bearing every 1000
hours with the unit running.
If using the unit for "prime power," replace the
bearing every 10,000 hours o r t w o years. If using the
set for "standby," replace the bearing every five years.
Check generator voltage. It may be necessary to
make a slight readjustment of the voltage rheostat to
obtain the preferred voltage at average load.
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