TM 1-1520-238-23
5-208.4
Change 7
5.46A.
MAIN ROTOR LOWER OIL SEAL RETAINER RESEATING – continued
b. Replenish grease cavity directly beneath main
rotor head lower bearing as required. Use
grease (item 87, App F).
NOTE
Over-packing of the grease cavity be-
tween the main rotor head lower bearing
and the lower oil seal will cause exces-
sive main rotor head grease leakage. If
grease replenishment is required, leave
sufficient space in the grease cavity for
thermal expansion and/or churning of the
grease.
c. Apply a thin uniform layer of sealing com-
pound to outer surface of retainer (1) immedi-
ately prior to installation. Use sealing
compound (item 167, App F).
(1) Allow sealing compound to cure undisturbed
for 2 HOURS at ambient temperatures of 70
to 77 F (21 to 25 C).
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M04-5168-7
GREASE CAVITY
MAIN ROTOR HEAD
LOWER BEARING
MAIN ROTOR
LOWER OIL SEAL
RETAINER
M04-5164-6
1
UPPER FLIGHT CONTROL COMPONENTS
REMOVED FOR CLARITY
