TM 1-1520-238-23
5-102
5.20.
MAIN ROTOR HUB RETENTION NUT INSTALLATION – continued
(3) Torque 12 bolts (5) to 315 INCH-POUNDS.
Use torque wrench.
g. Remove retaining ring (4).
(1) Remove 12 bolts (5) in reverse order starting
with No. 12.
(2) Remove retaining ring (4).
h. Hand tighten retention nut (2).
i. Install retaining ring (4).
(1) Aline tangs on retaining ring (4) with slots on
mast (3).
(2) Place retaining ring (4) on top of retention nut
(2).
(3) Aline holes. If holes in retaining ring (4) do not
aline with holes in retention nut (2), loosen
retention nut (2) until alignment is obtained.
j. Lubricate threads of bolts (5). Use lubricant
(item 114, App F).
(1) Allow bolts (5) to dry for 6 HOURS after coat-
ing with lubricant.
(2) Alternate accelerated cure time is 30 MIN-
UTES air dry plus 30 MINUTES at 150 F (66
C).
k. Install 12 bolts (5) in retaining ring (4).
(1) Torque 12 bolts (5) to 45 INCH-POUNDS.
Use torque sequence from step f. Use torque
wrench.
(2) Torque 12 bolts (5) to 90 INCH-POUNDS.
Use torque wrench.
(3) Torque 12 bolts (5) to 135 INCH-POUNDS.
Use torque wrench.
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10
2
11
7
3
5
9
1
8
4
6
12
5
4
2
M04-213-3
SLOT
3
TANG
10
2
11
7
3
5
9
1
8
4
6
12
M04-213-4
5
