Fig. 7 - Adjusting Buffer Screw
Adjust Buffer Screw
Fig. 6 - Adjusting Idle Speed
1.
With the engine running at normal operating
temperature, turn the buffer screw in (Fig. 7) so that it
governor gap is required, the position of the injector
contacts the differential lever as lightly as possible and
racks must be rechecked.
still eliminates engine roll.
NOTE: Governor stops are used to limit the
NOTE: Do not increase the engine idle
compression of the governor spring which
speed more than 15 rpm with the buffer
determines the maximum speed of the
screw.
engine.
2. Hold the buffer screw and tighten the lock nut.
Adjust Idle Speed
Adjust Booster Spring
With the maximum no-load speed properly adjusted,
adjust the idle speed as follows:
With the engine idle speed set, adjust the booster spring
as follows:
1. Place the stop lever in the run position and the speed
control lever in the idle position.
1. Move
the speed control lever to the idle speed
position.
2.
With the engine running at normal operating
temperature, back out the buffer screw to avoid contact
2. Refer to Fig. 8 and loosen the booster spring
with the differential lever.
retaining nut on the speed control lever. Loosen the
lock nuts on the eye bolt at the opposite end of the
3. Loosen the lock nut and turn the idle speed adjusting
booster spring.
screw until the engine is operating at approximately 15
rpm below the recommended idle speed (Fig. 6). The
3. Move the spring retaining bolt in the slot of the speed
recommended idle speed is 550 rpm, but may vary with
control lever until the center of the bolt is on or slightly
special engine applications.
over center (toward the idle speed position) of an
imaginary line through the bolt, lever shaft and eye bolt.
4. Hold the idle speed adjusting screw and tighten the
Hold the bolt and tighten the lock nut.
lock nut.
4. Start the engine and move the speed control lever to
the maximum speed position and release it. The speed
control lever should return to the idle speed position. If
it does not, reduce the tension on the booster spring. If
the lever does return to the idle position, continue to
increase the spring tension until the point is reached
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