Figure 8A-3. Propeller Governor
8A-12. RIGGING AND ADJUSTMENT OF PROPELLER GOVERNOR. (Refer to Figure 8A-3.)
a. Start engine, park 90° to wind direction and warm in normal manner.
b. To check high RPM, low pitch setting, move the propeller control all the way forward. At this position
the governor speed control arm (1) should be against the high RPM fine adjusting screw (2). With the
throttle full forward, observe engine RPM, which should be 2700 RPM with high RPM properly
adjusted.
c. Should engine RPM not be as required, the high RPM setting should be adjusted as follows:
1. Shut down the engine and remove the upper engine cowl.
2. Adjust the governor by means of the fine adjustment screw (2) for 2700 RPM. To do this, loosen
the high RPM fine adjustment screw locknut and turn the screw in a clockwise direction to
decrease engine speed or in a counterclockwise direction to increase engine speed.
NOTE
One revolution of the fine adjustment screw will increase or decrease the
engine speed approximately 20 RPM.
3. Reinstall upper engine cowl and repeat Step b to ascertain proper RPM setting.
4. After setting the proper high RPM adjustment, run the self-locking nut on the fine adjustment
screw against the base projection to lock.
5. Ascertain that the governor control arm (1) is adjusted to the proper angle on the control wheel (4)
d. With the high RPM adjustment complete, the control system should be adjusted so that the governor
control arm will contact the high RPM stop when the cockpit control knob is .032 to .047 of an inch
from its full forward stop. To adjust the control knob travel, disconnect the control cable end from the
control arm, loosen the cable end jam nut and rotate the end to obtain the desired level clearance.
Reconnect the cable end and tighten jam nut.
e. It is usually only necessary to adjust the high RPM (low pitch) setting of the governor control system,
as the action automatically takes care of the positive low RPM (high pitch) setting.
Revised 12/l l/78
2C24
CHEROKEE ARROW III SERVICE MANUAL
POWER PLANT - LYCOMING
Summary of Contents for ARROW III
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