TM 1-1520-238-23
5-188
5.42.
MAIN ROTOR HEAD DISASSEMBLY (AVIM) – continued
WARNING
Main rotor hub weighs approximately
200 pounds. Use crane to lift rotor
hub. Failure to do so could result in
serious injury. If injury occurs, seek
medical aid.
NOTE
If the main rotor hub is to be replaced,
perform steps b, c, d, e, and f. If hub is to
be removed, go to step f.
b. Remove main rotor droop stop ring (para
5.44).
c. Remove main rotor upper seal retainer and
plain encased seal (para 5.45).
d. Remove main rotor lower seal and oil seal re-
tainer (para 5.46).
e. Remove main rotor electrical brush, brush
holder, and pitch web electrical lead (para
5.48).
f. Remove hub (2) from lower shoe (3).
(1) Hold eight bolts (4).
(2) Remove eight nuts (5) and washers (6).Use
hinged handle, two sockets, and box wrench.
(3) Remove eight bolts (4) and preload indicating
(PLI) washers (7).
(4) Discard PLI washers (7).
(5) Lift hub (2) from shoe (3).
(6) Place hub (2) flat side down on work bench.
g. Remove four main rotor strap packs (8),
spacers (9), and hub plate (10) from shoe (3).
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FLAT SIDE
4
3
6
5
2
M04-246-2
7
BLOCKS
M04-246-4
8
10
3
9
