Brake and Air System Maintenance Instructions (Cont)
Rotate adjusting hex head (29) until slack
adjuster (22) hole alines with brake chamber
yoke (30) hole.
Install bracket (25) on control arm (31) with
nut (32). Do not tighten nut.
Rotate control arm (31) away from adjusting
hex head (29), towards brake chamber (26),
until control arm comes to a definite internal
Tighten nut (32). Ensure that control arm (31)
does not move its position when tightening
Tighten nut (28).
Install clevis pin (33) through slack
adjuster (22) and brake chamber yoke (30).
Install rear hub (para 12-3).
A minimum of 13 lb-ft (18 Nm) of torque is necessary
to overcome the slack adjusters internal clutch. A
ratcheting sound will occur. If a minimum of 13 lb-ft
(18 Nm) cannot be achieved, replace slack adjuster.
Rotate adjusting hex head (29) clockwise until
brake lining contacts drum. Once contact is
made, back-off adjusting hex head by 1/2 turn.
With full air pressure, release spring and service brake, and check that control arm (31)
installation indicator is within slotted area.
Remove clevis pin (33) and check that brake chamber yoke (30) hole and slack adjuster (22) hole
remain in alinement. If the brake chamber yoke pulls into the brake chamber (26), loosen
nuts (28) and (32) and repeat b. Installation steps (12) through (19) and c. Adjustment steps (1)
and (2). If brake chamber yoke hole and adjuster hole remain in alinement, go to step (3).
After slack adjuster (22) is adjusted properly, install clevis pin (33) and new cotter pin (34).
d. Follow-on Maintenance. None.
END OF TASK