TM 1-1520-238-23
Change 5
5-208.15
5.46C.
MAIN ROTOR LOWER BEARING GREASE REPACKING (AVIM) – continued
5.46C.6. Servicing
NOTE
A small amount of grease overfill on top
area of bearing roller and cage is accept-
able.
a. Repack lower bearing inner race/rollers and
cage (TM 55-1500-322-24). Use grease
(item 87, App F).
b. Apply a bead of grease between top of lower
bearing and mast liner. Use grease (item 87,
App F).
c. Apply a thin layer of grease on mast liner
where center seal rides. Use grease (item 87,
App F).
d. Apply a thin layer of grease to sealing surface
of center seal. Use grease (item 87, App F).
e. Inspect (QA).
5.46C.7. Installation
CAUTION
Use care not to damage or unseat center
seal when installing top of mast liner
through center seal. If center seal is dam-
aged or unseated, the main rotor head
must be serviced at depot.
a. Gently install mast liner/lower bearing (3) into
hub (2). Use care not to damage or unseat center
seal (4).
b. Inspect (QA).
GO TO NEXT PAGE
M04-5196-7
LOWER BEARING
INNER RACE
CENTER SEAL
MAST LINER
LOWER BEARING
OUTER RACE
BEARING ROLLER
AND CAGE
GREASE CAVITY
MAIN ROTOR HEAD
M04-5196-8
2
4
3
