TP-6073 4/06 25Section 4 Fuel System
4.4 Governor
The centrifugal, mechanical-type governor maintains
constant engine speed by automatically adjusting the
fuel supply to the engine depending on load changes.
The governor requires no regular service. The governor
is factory-set during run-in and requires no further
adjustment unless greatly varying load conditions are
encountered or if 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 frequency meter. Loosen the
locknut on the speed-adjusting screw. Turn the screw
counterclockwise to increase speed (and frequency) or
clockwise to decrease speed. Tighten the locknut to
secure at a new setting. See Figure 4-4.
1-933
1. Locknut
1
Figure 4-4 Governor, Typical
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