TM 55-1520-240-23-4
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INSTALL ROTARY-WING BLADE
(Continued)
5-84
13.
Install upper vertical pin nut (20.1) as follows:
a.
Have helper support drive bar (22). Remove
nut (26) and washer (25).
b.
Remove torque wrench (T23) (23).
c.
Install upper nut (20.1) on pin (18) and
hand-tighten.
d.
Install spanner socket (27) on drive bar (22)
over pitot socket (21). Seat spanner socket
on upper nut (20.1).
NOTE
Pitot socket can be pushed out of
vertical pin notches.
e.
Have helper raise drive bar (22) slightly. Have
him rotate bar until flats on bar seat in pitot
socket (21). Continue to support bar.
f.
Install torque wrench (T23) (23) on drive bar
(22). Turn handle (24), in either direction, until
wrench is seated on spanner socket (27).
g.
Install washer (25) and nut (26) on drive bar
(22). Have helper release bar.
h.
Turn handle (24) counterclockwise to
install upper nut (20.1). Torque nut to 145
foot-pounds. Check gap between inner
bearing race (14) and liner (28) of blade (4).
There shall be no gap over more than half
of contact surfaces.
NOTE
No limit on gap depth.
INSPECT
i.
Remove nut (26), washer (25), torque wrench
(T23) (23), spanner socket (27), pitot socket
(21), and drive bar (22).
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