TM 9-2330-383-14&P
4-18. SLACK ADJUSTER (CONT)
INSTALLATION
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WARNING
The slack adjuster must be installed with the arrow stamped on the side
pointing AWAY from the air chamber. If the slack adjuster is installed
wrong, brake failure may occur, possibly causing serious injury to
personnel.
The slack adjusters for the front and rear axles are not identical.
When reinstalling or replacing, ensure that the correct slack adjuster
is used. Installation of incorrect slack adjuster may cause brake
failure and possible serious injury to personnel.
a. Lightly grease slack adjuster splines and slide slack adjuster (4) onto
camshaft (8).
b. Visually check alinement of slack adjuster and brake chamber push rod. If
required, install an additional washer between slack adjuster and drum to
center the slack arm in the clevis.
c. Install two washers (7 and 6) and install snap ring (5).
d. Install washer (10) and nut (9).
e. Check camshaft end play. Add or delete washers to obtain end play of between
0.020 and 0.045 inch.
CAUTION
Ensure that the push rod is threaded as far as possible into the
clevis. The face of the threaded push rod should be flush or protruding
slightly from the inside of the clevis.
f. Verify that the dimension between the air chamber mounting face and the
center of clevis pin is between 2.25 and 2.50 inches. If adjustment is
necessary, loosen jam nut above clevis, adjust clevis to 2.50 inches, and
tighten jam nut to 15-20 lb ft.
NOTE
Some slack adjusters are equipped with two clevis pin holes.
On the rear brakes, install the clevis in the slack adjuster hole
furthest from the camshaft.
On the rear brakes, install the clevis in the slack adjuster hole
closest to the camshaft.
g. Rotate adjustment hex on underside of slack adjuster (4) clockwise until
holes in slack adjuster arm aline with push rod clevis (3).
4-36