Onan CCKB - Speed Adjustment; Sensitivity Adjustment; Vacuum-Booster Adjustment

THROTTLE
STOP SCREW
FUEL IDLE
adjustment
■ T HIS DISTANCE
1/32 INCH (0,79 mm)
AT NO LOAD
CARBURETOR
INTERNAL SPRING
BRACKET
VACUUM
BOOSTER -
CARBURETOR
THROTTLE ARM-
THIS
DISTANCE
DETERMINES
SENSITIVITY
carburetor
throttle
PLATE-
J
J
u
o
r
QjjJJ
□
EXTERNAL
SPRING
BALL JOINT
GOVERNOR
ARM
GOVERNOR ADJUSTMENT
FIGURE 17. GOVERNOR DETAILS
Speed Adjustment: With the set at operating
temperature and no load, and with the booster
external spring disconnected, adjust the tension of
the governor spring. Turn the speed-adjusting nut to
obtain the correct voltage and speed reading.
Sensitivity Adjustment: Check the voltage and speed,
first with no load connected, and again with a full
load. Adjust the sensitivity to give the closest regula¬
tion (least speed and voltage difference between no
load and full load) without causing a hunting condi¬
tion.
To increase sensitivity (to get closer regulation),
move the governor spring toward the governor shaft.
An adjustment for too much sensitivity will cause
alternate increasing and decreasing 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.
Vacuum-Booster Adjustment
1. After sensitivity adjustment, reconnect the
booster external spring to the governor linkage
(Figure 17).
2. With generating set running at no load, move
adjustable slide to point where there is no tension
on spring.
3. Apply full-rated load to generating set.
4. If the speed increases more than at no-load,
lessen the speed booster’s internal spring ten¬
sion. To change tension, pull out the spring
bracket and move the pin to a different hole
(Figure 17). If speed decreases when the load is
applied, increase the booster’s internal spring
tension.
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