TP-6071 3/00 13Section 4 Fuel System
4.5 Governor
The centrifugal, mechanical governor keeps the engine
speed constant by automatically adjusting the amount
of fuel supplied to the engine according to changes in
the load. The govorner requires no regular service. The
factory adjustes the governor during run-in, and further
adjustment should not be needed unless greatly varying
load conditions are encountered or if poor governor
control develops after extended usage.
60 Hz generator sets are designed to operate in the
range of 57-63 Hz (1800 rpm under full load and
1890 rpm under no load).
50 Hz generator sets are designed to operate in the
range of 47.5-52.5 Hz ± 5% (1500 rpm under full load
and 1590 rpm under no load).
To check the engine speed, use a frequency meter
connected to the load leads or use a hand tachometer. If
adjustment is needed, loosen the locking nut on the
speed adjusting screw. Turn the screw clockwise to
increase the speed (and frequency). To decrease the
speed, turn the screw counterclockwise. Tighten the
locking nut when the correct setting is reached. See
Figure 4-4.
1
2
1. Speed adjusting screw
2. Locking nut
607146
Figure 4-4 Governor Adjustment
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