TP-5594 5/95 Scheduled Maintenance 3-9
Governor
The centrifugal, mechanical-type governor serves to
keep 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
needed unless greatly varying load conditions are
encountered or if poor governor control develops after
extended usage.
60-Hzgenerator setsaredesignedtooperateat60--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 3-9. Loosen the locking
nut on the speed-adjusting screw. Turn the screw in
clockwise direction to increase speed (and frequency)
or in counterclockwise direction to decrease speed.
Tighten the locknut to secure screw at new setting.
1-932
1
2
1. Locking Nut
2. Speed Adjusting Screw
Figure 3-9. Governor
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