TM 55-1520-240-23-4
5-9
INSTALL ROTARY-WING HEAD
(Continued)
5-9
27.
Install tang washer (34) on nut (23).
Do not file tang washer to make it
fit. Filing can cause tangs to break
causing loss of helicopter and loss
of life.
28.
If tang washer (34) cannot be seated in any
position, repeat steps 12 thru 27. Increase
torque of step 21 to 5750 foot-pounds to permit
washer to be seated.
29.
If tang washer (34) cannot be seated in any
position, repeat steps 18 thru 27, increasing
torque to 6000 foot-pounds.
Before backing off torque, the three
reaction hooks must be reversed so
that the REMOVAL side faces out,
as in Task 5-8; otherwise, injury to
personnel and damage to equipment
may occur.
30.
If tang washer (34) still will not seat, back off
nut (23). (Refer to Task 5-8.) Repeat steps 18
thru 27, torquing nut to 5600 foot-pounds and
other in-between torques as needed for washer
alignment.
31.
Install retaining ring (35) in groove of nut (23).
INSPECT
32.
Install packing (36) on hub oil tank (21).
33.
Position cover (37) on hub oil tank (21).
34.
Position retainer (38) on cover (37). Install nine
screws (39) and washers (40). Torque screws to
23 inch-pounds.
5-66
