TM 1-1520-238-23
5-194
5.43.
MAIN ROTOR HEAD ASSEMBLY (AVIM) – continued
k. Lubricate eight bolts (14) and threads of nuts
(15). Use lubricant (item 114, App F).
(1) Allow lubricated bolts (14) and nuts (15) to
dry for 6 HOURS at room temperature, or air
dry for 30 MINUTES and then cure for 30
MINUTES at 150 F (66 C).
WARNING
Main rotor hub weighs approximately
200 pounds. Use crane to lift rotor
hub. Failure to do so could result in
serious injury. If injury occurs, seek
medical aid.
CAUTION
Tighten nuts only. Do not allow bolts to
turn in main rotor hub. Damage to main
rotor hub and lower shoe will result.
l. With assistant, install hub (2) on shoe (10).
Torque eight nuts (15) to 480 INCH-POUNDS.
(1) Place hub (2) on strap packs (13) and aline
bolt holes. Use sling set kit.
(2) Install eight new preload indicating (PLI)
washers (16) in proper sequence on eight
bolts (14).
(a) Install washer (17), inner washer (18),
outer washer (19), and washer (20).
(3) Install eight bolts (14) with PLI washers (16)
through hub (2), and shoe (10).
(4) Install eight washers (21) and new nuts (15)
on bolts (14).
(5) Hold eight bolts (14). Torque nuts (15) to 480
INCH-POUNDS. Use torque wrench,
adapter, hinged handle, and sockets.
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