GOVERNOR AND INJECTOR RACK CONTROL ADJUSTMENT
Do not raise the engine idle speed more than 20 rpm with the buffer screw. Check
the maximum no-load speed to make sure it has not increased over 25 rpm by the
buffer screw setting.
Adjust Governor Booster Spring
The governor booster spring is used on some engines to reduce the force necessary to move the speed control
lever from the idle speed position to the maximum speed position. Adjust the booster spring as follows:
Move the speed control lever to the idle speed position.
Reduce the tension on the booster spring, if not previously performed, to the minimum by backing
off the outer locknut (Fig. 8) until the end of the booster spring eyebolt is flush with the end of the nut.
Adjust the eyebolt in the slot in the bracket so that an imaginary line through the booster spring will
align with an imaginary centerline through the speed control shaft. Secure the locknuts on the eyebolt to retain
Move the speed control lever to the maximum speed position and note the force required. To
reduce the force, back off the inner locknut and tighten the outer locknut to increase the tension on the booster
Before tightening the locknuts, reposition the booster spring as in Step 3.
Figure 6. Adjusting Maximum No-Load Engine
Figure 7. Adjusting Buffer Screw