Onan 25.0 DEH-53R Series Operator's Manual And Parts Catalog page 30

GENERAL MAINTENANCE
G E N E R A L
Follow a definite schedule of inspection and ser-
vicing, based on operating hours (Table 5). Keep an
accurate logbook, of maintenance, servicing, and
operating time. Use the running time meter to keep a
record of operation and servicing. Service periods
outlined are recommended for normal service and
operating conditions. For continuous duty, extreme
temperature, etc., service more frequently. For in-
frequent use, light duty, etc., service periods can be
lengthened accordingly. Refer to Ford^Dorset engine
manual for details of engine service and maintenance
procedures.
W A R N I N G
Before performing any maintenance work on
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.
C O N T R O L
L E V E R
IDLING
STOP
SCREW
MAXIMUM SPEED
STOP SCREW
FIGURE 25. GOVERNOR SPEED ADJUSTMENT
ENGINE S P E E D
Generator frequency is in direct ratio to enginespeed
which is controlled by the governor. The governor
controlling the DEH set is integral with the injector
pump. High and low speed limit stops are set at the
ONAN testing facility and normally do not require
further adjustment, therefore if your set is ori con-
tinuous standby service, the governor may never
need to be touched.
If however the unit is removed for repair or the set is
used frequently, adjustment may be necessary due to
wear of internal components.
To adjust governor, proceed as follows:
1. Loosen lock nuts on idle stop screw and max-
imum speed stop screw. Refer to Figure 25.
2. Start engine; apply full load.
If governor se'' 'g is considerably out of adjustment, adjust
low speed stop .crew until frequency meter indicates ap-
proximately 63 >:z before applying load.
3. - Back off maximum speed stop screw (screwdriver
slot).
4. Turn'idle speed stop screw clockwise until fre-
quency meter indicates 60 Hz. (Counterclockwise
reduces rpm.)
5. Turn maximum speed stop until it bottoms on
governor control lever. .
6. Secure lock nuts.
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.
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