Constant Speed Unit (Csu) Installation - Thrush Aircraft S2RHG-T65 TURBO THRUSH Maintenance Manual

THRUSH AIRCRAFT, INC – MODEL S2RHG-T65 TURBO THRUSH
B. Remove bolt that secures the propeller control cable to the governor's speed
select lever.
C. Remove the cotter pin, castellated nut, and washer and bolt securing the Nf
governor-interconnecting rod to the Nf governor reset arm.
D. Remove the cotter pin, castellated nut, washer, bolt and spacer securing the front
clevis end to the propeller-reversing lever.
E. Remove the cotter pin, washer, clevis pin and bushing securing the propeller-
reversing lever to the beta valve. Remove reversing arm.
F. Disconnect coupling nut of pneumatic (Py) front tube from straight nipple on
propeller governor.
G. Remove the four nuts and washers anchoring the governor to the mounting pad
on the reduction gearbox case.
H. Remove governor and governor mounting pad gasket.
I. If CSU is to be replaced by a new or overhauled unit, remove the straight nipple
from Py port on governor. Remove "O" ring and retain nipple for reuse on the
replacement unit.

CONSTANT SPEED UNIT (CSU) INSTALLATION

A. Install a new gasket over the four studs on the governor-mounting pad.
Make sure the gasket is placed on the mounting pad with the
raised side of the screen up so that it will fit into the recess on
the base of the governor.
B. If a new or overhauled propeller governor is to be fitted, install straight nipple as
follows:
1. Lubricate new "O" ring with clean engine oil and install on nipple.
2. Install nipple in Py port on propeller governor. Tighten and torque nipple to
65 to 70 lb. in.
C. Lightly coat the splined shaft of the governor with clean engine oil.
Ensure drive splines are completely engaged by checking that
flange of governor rests squarely on gasket with no gap.
Rotate propeller to assist engagement, if necessary.
D. Position the governor on the mounting pad and secure it in place with the four
attaching washers and nuts. Torque the nuts to 125 to 135 inch-pounds.
E. Secure the propeller-reversing lever to the beta valve with the attaching bushing,
clevis pin, washer and cotter pin.
4-20
AIRCRAFT MAINTENANCE MANUAL
** CAUTION **
** CAUTION **
Effective: 5/05/04