TM 1-1520-238-23
Change 1
5-201
5.45.
MAIN ROTOR UPPER SEAL RETAINER AND PLAIN ENCASED SEAL
REMOVAL/INSTALLATION – continued
5.45.4. Cleaning
a. Remove grease from head above bearing rollers and retainer. Use depressor (item 70, App F) and cloth
(item 52, App F).
CAUTION
Damage to the main rotor head may occur if main rotor head grease is contaminated. Avoid contami-
nating grease with old sealant.
b. Clean old adhesive from steel shell of main rotor head. Use depressor (item 70, App F) and methyl ethyl
ketone (item 124, App F).
5.45.5. Inspection
a. Check main rotor head for nicks, scratches, and gouges. None allowed.
b. Check outside diameter of retainer for grooves and nicks.
(1) Blend out, maximum 0.010 INCH.
c. Check head and retainer for corrosion (para 1.49).
d. Check components for cracks. None allowed.
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