Piper Arrow IV Turbo Maintenance Manual page 564

3. Should engine RPM not be as required, the high RPM setting should be adjusted as follows:
A. Shut down the engine and remove the upper engine cowl.
B. Adjust the governor by means of the fine adjustment screw 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.
One revolution of the fine adjustment screw will increase or
decrease the engine speed approximately 20 RPM.
C. Reinstall upper engine cowl and repeat Step 2 to ascertain proper RPM setting.
D. After setting the proper high RPM adjustment, run the self-locking nut on the fine adjustment
screw against the base projection to lock.
E. Ascertain that the governor control arm is adjusted to the proper angle on the control wheel as
shown in Figure 61-7.
4. 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.
5. 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.
Effectivity
PA-28RT-201
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
—NOTE—
—END—
3B8
61-20-03
Page 61-13
December 1, 1978