TM 1-1520-238-23
Change 9
6-12.1
6.1.
DRIVE SHAFT INSPECTION – continued
NOTE
Ensure that the small flange points inward toward the hanger bearing.
(2) Install hanger bearing (1) on hanger bearing support (2), and install nutation/torque reactor tool (3) on
flange of hanger bearing using bolt (4) and nut (5) (Figure D-483, App D).
(3) Position torque wrench on small flange with 3/8-inch attachment hole.
(4) Check breakaway nutation torque in three planes (12, 4 and 8 o’clock positions) from centered starting
position. Ensure that breakaway torque is between 10 and 300 inch pounds in all three planes.
(5) If breakaway torque is less than 10 inch pounds in any of three planes, replace hanger bearing.
(6) If breakaway torque exceeds 300 inch pounds in any of three planes, clean hanger bearing (para 6.1A).
(7) Record initial torque value(s) on maintenance checklist.
x. Nut torque check.
(1) Visually inspect nut for broken or missing torque stripe. If torque stripe is intact, inspection is complete.
NOTE
When checking torque use AH-64 nutation/torque reactor tool and 1/2 drive breaker bar to
restrain hanger bearing flange.
(2) If torque stripe is missing or broken, verify 700-800 inch pounds torque by rotating nut in clockwise
direction. If nut moves before reaching 700 inch pounds, replace nut.
y. Check drive shafts and components for corrosion (para 1.49).
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