TM 1-1520-238-23
Change 5
5-208.13
5.46C.
MAIN ROTOR LOWER BEARING GREASE REPACKING (AVIM) – continued
5.46C.4. Cleaning
a. Clean grease from spacer. Use cloth (item 52,
App F).
b. Clean grease from hub cavity. Use cloth
(item 52, App F) and depressor (item 70, App F).
c. Clean grease from center seal. Use cloth
(item 52, App F).
d. Clean grease from lower bearing outer race.
Use cloth (item 52, App F).
e. Clean grease from bearing rollers and roller
cage, inner race, bearing surfaces, and mast
liner. Use cloth (item 52, App F).
5.46C.5. Inspection
NOTE
If the mast liner needs replacement, the
main rotor head will need to be serviced
at depot.
a. Check center seal for damage to sealing lip of
seal. None allowed.
b. Check mast liner where center seal and lower
seal ride for excessive wear.
(1) Blend out, maximum 0.010 INCH.
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M04-5196-5
LOWER BEARING
INNER RACE
CENTER SEAL
MAST LINER
LOWER BEARING
OUTER RACE
SPACER
BEARING ROLLER
AND CAGE
GREASE CAVITY
