Kohler 8.5RES Service page 90

Mechanical Governor Sensitivity Adjustment
Note: Often hunting/surging problems thought to be
caused by the governor are actually caused by
engine or carburetor problems. If the generator
set speed is unstable, hunts, or surges, check for
the cause using the procedure in Section 6.9.3
before proceeding.
Governor sensitivity is adjusted by repositioning the
governor spring in the holes of the governor lever. If
speed surging occurs with a change in engine load,
decrease the governor sensitivity. If a drop in speed
occurs when normal load is applied, increase the
governor sensitivity. See Figure 6-27 and adjust as
follows:
1. To increase the sensitivity, move the spring closer
to the governor cross shaft.
2. To decrease the sensitivity, move the spring away
from the governor cross shaft.
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1. Governor lever
2. Cross shaft
Figure 6-27 Governor Sensitivity Adjustment
90 Section 6 Component Testing and Adjustment
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Engine Speed (Frequency) Adjustment,
Mechanical Governor
Use the adjusting nut shown in Figure 6-28 to adjust the
engine speed, if necessary. Recommended engine
speeds with no load and full load are shown in
Figure 6-29.
1. With the engine running, loosen the lock nut.
2. If the engine is running too slow (frequency is low),
turn the adjusting nut clockwise to increase the
speed.
3. If the engine is running too fast, turn the adjusting
nut counterclockwise, backing the nut out and
decreasing the speed.
4. Verify that the engine speed is correct and tighten
the locknut.
#
1. Speed adjusting nut and lock nut
photo5005
Figure 6-28 Engine Speed Adjustment
Generator Set Load
No Load
Full Load
Figure 6-29 Recommended Engine Speed
photo5005
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Engine Speed
3780 RPM (63 Hz)
3600 RPM (60 Hz)
TP-6196 10/09