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 engine. If necessary, again adjust vernier so that full-load
i. Maximum Speed Adjustment. The maximum speed
speed of generator is 1,200 rpm.
adjusting screw (4, fig. 5-51) limits travel of governor speed
(5) Move main switch to OFF position to remove
adjusting shaft. This, through linkage, controls the throttle
generator load from engine. Note engine speed. If droop is
at the control cabinet. Moving the screw in will decrease,
satisfactory. engine speed will now be 1.250 rpm. If engine
and out will increase, the maximum engine speed. This
no-load speed is too high. stop engine and again loosen bolt
adjustment should be made after the fuel rod, maximum fuel,
(2) and decrease droop by moving bracket (5) out or away
and the speed droop adjustments have been made.
from engine. To increase droop, move bracket in or toward
engine. Repeat this procedure until engine no-load speed is
1,250 rpm and full-load speed is 1,200 rpm.
1.
Subcap assembly. governor
3.
Locknut
2.
Governor case
4.
Screw, governor high speed stop
Figure 5-51. Setting maximum speed adjusting screw.
(1) Loosen locknut (3) and back out maximum
(3) Turn throttle vernier back to bring no-load
speed screw (4), as was done for adjusting the speed droop.
speed to 1,250 rpm.
Start and warm engine to operating temperature.
j. Removal. In case of major repairs, or a complete
(2) With no-load on engine, turn throttle vernier
governor change, the governor must be removed from the
and increase the no-load engine speed to 1,300 rpm. With
engine.
engine running at this speed, turn the maximum speed
(1) Remove valve rocker cover, and disconnect
adjusting screw in until engine speed drops to 1,290 rpm.
governor fuel rod (8, fig. 5-52) from the injector control tube
Tighten locknut (3).
lever (9).
5-64
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