TM 1-1520-238-23
Change 3
5-208.7
5.46B.
MAIN ROTOR UPPER BEARING INNER RACE/ROLLERS GREASE REPACKING
(AVIM) – continued
5.46B.3. Removal
a. Wipe main rotor head (1) upper surface using
outward motion away from main rotor upper
bearing inner race/rollers (2). Use cloth
(item 52, App F).
CAUTION
After removal, upper bearing inner race/
rollers must be placed on a clean, dry,
dust-free surface. Failure to do so will
result in damage to bearing.
b. Remove main rotor upper bearing inner race/
rollers (2) from main rotor head (1). Use gloves
(item 82, App F).
NOTE
If upper bearing inner race rollers and
head upper cavity grease has been dam-
aged by heat (discoloration) or contami-
nated by metal, main rotor head is
unserviceable.
5.46B.4. Cleaning
a. Clean grease from upper cavity. Use cloth
(item 52, App F) and depressor (item 70, App F).
b. Clean grease from lower cavity. Use cloth
(item 52, App F) and depressor (item 70, App F)
c. Clean grease from head outer race surfaces.
Use cloth (item 52, App F).
d. Clean grease from bearing rollers and roller
cage, inner race, and bearing surfaces. Use
cloth (item 52, App F).
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M04-5168-2
2
1
M04-5168-3
UPPER BEARING
BEARING INNER
RACE
LOWER CAVITY
MAIN ROTOR
HEAD
UPPER CAVITY
MAIN ROTOR
HEAD BEARING
OUTER RACE
BEARING ROLLER
AND CAGE
MAIN ROTOR UPPER BEARING
