TM 1-1520-238-23
Change 4
6-31
6.6.
FORWARD HANGER BEARING COUPLING REMOVAL/INSTALLATION – continued
CAUTION
When installing forward hanger bearing
coupling, ensure that bolts are installed
through 0.250 INCH bolt holes on cou-
pling aft 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) Position coupling (1) between flange (7) and
shaft (4) with nutplates (14) facing forward.
Aline bolt holes.
(2) Install five bolts (5) through flange (7) and
coupling (1) forward flange (6).
(3) Install five bolts (2) through coupling (1) aft
flange (3) and shaft (4).
(4) Torque bolts (2) and (5) to 125 INCH-
POUNDS. Use torque wrench adapter and
torque wrench.
(5) Apply corrosion preventive compound to
bolts (2) and (5). Use corrosion preventive
compound (item 62A, App F).
c. Inspect (QA).
d. Secure forward catwalk (para 2.84).
e. Secure access doors T250L, T250R, T290L,
T290R, and L325 (para 2.2).
f. Perform drive system vibration maintenance
operational check (TM 1-1520-238-T).
END OF TASK
5
7
2
1
4
M04-0439-3
14
6
3
