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3161 GOVERNOR
TESTING AND ADJUSTING
GOVERNOR ADJUSTMENTS
DROOP SETTING - INTERNAL
ADJUSTMENT
INTERNAL DROOP ADJUSTMENT
1. Locknut.
When the position of the droop pivot pin (internal
EXTERNAL DROOP ADJUSTMENT
or external) is changed on the terminal lever, the percent
1. Bolt.
of governor droop changes.
To change the droop setting, loosen the
To change the droop pivot pin setting on
adjustment lever bolt (1) and move the lever down to
governors not equipped with an external adjustment
decrease droop, and up to increase droop.
lever, the governor top cover must be removed.
DROOP SETTING CHECK
The droop pivot pin is fastened to the terminal
After an adjustment has been made to the droop
lever with locknut (1). With the nut loosened, the pivot
pivot pin (internal or external), the setting can be
pin can be moved from minimum droop to maximum
checked by alternately loading and checking the high idle
droop. It is shown here in the minimum droop position.
speed.
The terminal shafts are clamped in the ends of
As this procedure is performed, the high idle
the terminal lever by two bolts.  A line can be drawn
screw will probably have to be adjusted. The full load
through the center of the two bolt heads and used for
speed of the engine will also adjust upward or downward.
reference in adjusting the droop pivot pin position.
As droop is decreased, full load speed is
When the pivot pin and nut is moved near the
increased, high idle speed is decreased. The greater
reference line as shown, the governor is set for minimum
the percent droop, expect the full load speed to
droop. As the pivot pin and nut are moved farther away
decrease, and the high idle speed to increase.
from the reference line, the droop is increased. When
Therefore high idle speed should be adjusted to set the
the pivot pin and nut are moved to the farthest point
full load speed at the correct rpm.
away from the reference line the governor is set for
maximum droop.
COMPENSATION NEEDLE VALVE
ADJUSTMENT
DROOP SETTING - EXTERNAL
ADJUSTMENT
After the engine has started and is under
governor control, open the needle valve (turn it
On the 3161 Generator Set Governor, the
counterclockwise) until governor operation just becomes
internal droop pivot pin locknut must be kept loose
unstable (starts to hunt), then turn the needle valve in
enough to be moved by the external droop adjustment
until engine speed has stability. Let the governor and
lever. The external droop adjustment lever is held in
engine get to operating temperature by operating a
place with a bolt which retains the droop setting.
minimum of one-half hour.
After the engine and
governor are at the operating tempera-
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