TM 9--2520--215--34
0052 00--2
BRAKE LINKAGE, BRAKE AND BRAKE AIR VALVE LINKAGE ADJUSTMENT
– CONTINUED
0052 00
BRAKE ADJUSTMENT
1. Apply brakes firmly and measure travel of brake apply levers on output reduction gear assemblies. Outer hole in
each lever should travel forward no less than 2.92 inches or through an arc of 24 degrees.
CAUTION
Travel must be no less than 24 degrees. Shorter travel will subject brakes to unnecessary wear
and cause overheating.
2. If travel is incorrect, release brake and adjust travel by rotating adjustment on brake apply lever. Clockwise
rotation will shorten travel, counter clockwise will lengthen it. Adjust travel to as near 24 degrees rotation as
possible. After brakes have been in use, readjust them if travel is 34 degrees or more.
BRAKE AIR VALVE LINKAGE ADJUSTMENT
1. After brake have been adjusted disconnect brake air valve linkage assembly from left brake apply lever. Loosen
three 3/8--24 hexagon nuts, which locks rod ends and brake air valve linkage rod.
2. Apply brakes firmly and, while brakes are applied, adjust length (between clevis pinhole centers) of brake air valve
linkage assembly. Length must be ¾ inch greater than the distance between clevis pin holes (center to center) in
brake apply lever and brake air valve linkage assembly lever. Release brakes.
NOTE
Plungers are correctly scribed when brakes are applied and a scribe mark is flush with bottom of
plunger stop, indicating manufactured and correct brake air valve linkage adjustment.
3. Tighten three 3/8--24 hexagon nuts and reconnect brake air valve linkage assembly to brake apply lever. Apply
brakes and check travel of plunger into plunger stop. Travel must be ¾ inch. Readjust as required to obtain
required travel.
END OF TASK
