MORE SENSITIVITY - TURN SCREW
COUNTERCLOCKWISE.
LESS SENSITIVITY - TURN SCREW
CLOCKWISE.
CARBURETOR
THROTTLE PLATE
CAM GEAR
GOVERNOR
SHAFT
GOVERNOR
SHAFT YOKE
GOVERNOR
CUP
SPEED ADJUSTING
NUT
THIS
DISTANCE
ETERMINES
SENSITIVITY
DECREASE SPEED-TURN
NUT COUNTERCLOCKWISE
INCREASE SPEED-TURN
NUT CLOCKWISE
SENSITIVITY
ADJUSTING
SCREW
FIGURE 12. GOVERNOR ADJUSTMENT
GOVERNOR
Rated speed and voltage appear on the nameplate
(also see Specifications). Engine speed equals fre-
quency multiplied by 30, on a 4 pole generator, thus
•
1800 rpm gives 60 hertz frequency. Preferred-speed-
varies approximately 2 to 3 hertz from no load to full
load operation. Be sure throttle, linkage and governor-
mechanism operate smoothly (Figure 12).
Linkage: The engine starts at wide open.throttle. The
length of the linkage connecting the governor arm of
the throttle arm is adjusted by rotating the ball joint.
Adjust length so that with the engine stopped and
tension on the governor spring, the.stop screw on the
carburetor throttle lever is
1/32-inch
from stop pin.
This setting allows immediate control by the governor
after starting and synchronizes travel of the governor
arm and the throttle shaft.
Speed Adjustment: With the warmed-up set operating
at no
load,
adjust the tension of the governor spring.
Turn the speed adjusting nut to obtain a voltage and
speed reading within the limits shown on the
nameplate.
. Sensitivity Adjustment: Check the voltage and speed,
first with no load connected and again with a full
load.
Adjust
,
the sensitivity so as to give the closest
regulation (least speed and voltage difference
between no load and full load) without causing a
hunting condition.
To increase sensitivity (closer regulation), move the
governor spring toward the governorshaft. An adjust-
ment for too much sensitivity will cause alternate
increase and decrease of engine speed (hunting).
To decrease sensitivity, move the governor spring
toward the outer end of the governor arm. Too little
sensitivity will result in too much difference in speed
between no load and full load conditions.
Any change in the sensitivity adjustment usually
requires a compensating speed (spring tension)
adjustment.
15
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