TM 1-1520-238-23
6-424
Change 2
6.96.
MAIN ROTOR DRIVE PLATE REMOVAL/INSTALLATION – continued
NOTE
Reinstall shim if removed from main rotor
head.
b. Install shim (7) if required between plate (1)
and head (2).
c. Install plate (1) on head (2). Torque 12 nuts (4)
to 125 FOOT-POUNDS.
(1) Position plate (1) on head (2). Ensure flat
edge (13) of plate (1) is between pitch hous-
ings (14) and (15).
NOTE
Provide clearance for de-ice electrical
lead over top of pitch housing.
(2) Apply a thin coat of lubricant on threads of 12
bolts (3). Use lubricant (item 114, App F).
(3) Allow threads to air dry 6 HOURS or air dry
for 30 MINUTES and cure for 30 MINUTES at
150 F (65.6 C).
(4) Install 12 countersunk washers (6) (with
countersink toward head of bolts) and bolts
(3) on plate (1).
(5) Install 12 washers (5) and new nuts (4) on
bolts (3).
(6) Hold 12 bolts (3). Torque 12 nuts (4) to 125
FOOT-POUNDS. Use torque wrench adapter
and torque wrench.
(a) Torque bolts (3) in the following order: 1,
2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12.
(b) Check torque of 12 nuts (4) in same se-
quence as torqued in step (6).(a). Torque
shall be 125 FOOT-POUNDS.
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