TM 9-2330-392-14&P
4-23 SERVICE BRAKE ADJUSTMENT (Con't).
7. Remove protective plug (6) in backing plate (5) adjusting slot (7).
8. Rotate star wheel (8) upward, 20 to 25 clicks, to tighten brakes.
NOTE
The brake adjustment is performed by rotating the wheel using a torque wrench and
measuring the force required to turn the wheel. While checking the adjustment, the
wheel must be turned in the forward direction to ensure correct adjustment. To rotate
the wheel in the forward direction, place your hand on the side of the wheel towards
the taillight and roll the wheel with your hand going over the top towards the tongue.
The torque wrench must be properly aligned on the wheel to ensure accurate
measurement of force. Proper placement for the torque wrench is with the handle
pointing away from the center of the wheel and in a straight line with the center of
the grease cap.
If the wheel rotates in the reverse or backwards direction, the brake shoes must be
aligned by starting the procedure again at step 9.
9. Rotate the wheel three or four revolutions in the forward direction and stop the wheel where two oppos-
ing lug nuts are directly above and below the center of the grease cap.
10. Set torque wrench (14) to 170 ± 17 in-lb (19 ± 1.9 N·m) and place on the top lug nut and turn the wheel
90 degrees, 1/4 rotation, in the forward direction checking whether the torque wrench (14) exceeded the
setting.
11. Move the torque wrench (14) back to the top, checking every other lug nut, and repeat step 10. Continue
checking torque until four lug nuts have been checked, one full rotation of the wheel.
12. Reset the torque wrench (14) to 220 ± 22 in-lb (24 ± 2.4 N·m) and repeat steps 10 and 11. If the torque
measurement at two or more lugs is less than 170 in-lb, tighten the brakes and repeat steps 10 through
12. If the torque measurement at two or more lugs is greater than 220 in-lb, loosen the brakes and repeat
steps 10 through 12.
13. The torque measurements at the four lugs must meet one of the following:
Number of lugs
Number of lugs
greater than 170 in-lb
Number of lugs
Condition
less than 170 in-lb
and less than 220 in-lb
greater than 220 in-lb
1
1
3
0
2
0
3
1
3
1
2
1
14. Loosen brakes by rotating star wheel (8) in the opposite direction 25 clicks.
15. Install protective plug (6) in backing plate (5) adjusting slot (7).
4-40
Change 1
