TM 1-1520-238-23
6-88
Change 4
6.15.
TAIL ROTOR GEARBOX INPUT COUPLING REMOVAL/INSTALLATION – continued
CAUTION
When installing tail rotor gearbox input
coupling, ensure that bolts are installed
through 0.250 INCH bolt holes on the
coupling lower flange and on the tail rotor
gearbox input flange. Do not install bolts
through any of 0.500 INCH lightening
holes. Installation of bolts through lighten-
ing holes will result in failure of drive shaft
and/or coupling.
b. Install coupling (1). Torque bolts (2) and (5) to
125 INCH-POUNDS.
(1) Push down on shaft (7).
(2) Position coupling (1) between flange (4) and
shaft (7) with upper flange (3) facing flange
(4). Aline bolt holes.
(3) Install five bolts (5) through coupling (1) lower
flange (6) and shaft (7).
(4) Install five bolts (2) through flange (4) and
coupling (1) upper flange (3).
(5) Torque bolts (2) and (5) to 125 INCH-
POUNDS. Use torque wrench adapter and
torque wrench.
(6) Apply corrosion preventive compound to
bolts (2) and (5). Use corrosion preventive
compound (item 62A, App F).
c. Inspect (QA).
d. Install access fairings L530 and L540 (para
2.2).
e. Perform drive system vibration maintenance
operational check (TM 1-1520-238-T).
END OF TASK
M04-0455-4
2
5
4
1
7
3
6
