MAINTENANCE AND ADJUSTMENTS
General mechanics tool kit
(1) To release failsafe spring forces from slack adjuster and camshaft, apply
air to air brake chamber. Do not apply the brakes. This procedure is to
release failsafe spring.
(2) Jack up the axle to be adjusted. Check that wheels rotate freely.
(3) Check clevis rod (1, figure 4-26) adjustment. Dimension from outside of
nonpressure housing to center of clevis pin must be 6-7/8 1/32 inches
( 1 7 . 5 c m ) . S l a c k adjuster (3) may have to be moved or adjusted to center
hole in air brake chamber with clevis rod (1). If dimensions of clevis rod
are not correct, remove cotter pin, clevis pin and loosen locknut. Adjust
clevis rod (1) to correct length. Tighten nut. Install clevis pin and new