TM 1-1520-238-23
Change 1
5-205
5.46.
MAIN ROTOR LOWER OIL SEAL AND OIL SEAL RETAINER REPLACEMENT (AVIM) – continued
CAUTION
Do not allow pitch housings to be unsup-
ported while inverting Failure to do so will
result in damage to strap packs and
feathering bearings.
5.46.3. Removal
a. With assistants, position rotor head (1) flat
side down on suitable support. Use sling set
kit.
b. Remove four screw plugs (2).
c. Remove main rotor lower oil seal retainer (3).
(1) Install four setscrews (4) and tighten until
they bottom against lower bearing. Use
screws.
(2) Continue tightening each setscrew 1/2 turn
until retainer (3) is free of hub (5).
(3) Remove four setscrews (4) from retainer (3).
d. Remove and discard main rotor lower oil seal
(6) from retainer (3).
(1) Support retainer (3), curved side down, on
blocks.
(2) Tap around end of seal (6) until it drops from
retainer (3). Use mallet.
5.46.4. Cleaning
a. Remove grease from lower oil seal retainer
and hub liner. Use depressor (item 70, App F),
methyl ethyl ketone (item 124, App F), and cloth
(item 52, App F) (para 1.47).
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