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Governor
The centrifugal, mechanical-type governor keeps the
engine speed constant by automatically adjusting the
amount of fuel supplied to the engine according to
changes in the load. No regular service is required on
the unit. The governor is adjusted during run-in at the
factory, and further adjustment is not necessary unless
encountering greatly varying load conditions or poor
governor control develops after extended usage.
60-Hz generator sets are designed to operate at
60--63 Hz, 1800 rpm under full load and 1890 rpm under
no load.
50-Hz generator sets are designed to operate at
50-52.5 Hz, 1500 rpm under full load and 1575 rpm
under no load.
To check speed, use a hand-held tachometer or
frequency meter. See Figure 3-10. Loosen the locking
nut on the speed-adjusting screw. Turn the screw in a
counterclockwise direction to increase speed and
TP-5605 4/97
frequency or in a clockwise direction to decrease speed.
Tighten the lock nut to secure at new setting.
1. Locking nut
Figure 3-10. Governor
1
1-933
Scheduled Maintenance 3-9
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