TM 9-2330-294-14
below the forward power unit and above the
b. Service Brake Adjustment (fig. 4-24). T h e
rear power unit, otherwise one or both of the
semitrailer brakes are self-adjusting. The self-
plunger housing assemblies have been
adjusting mechanism is activated each time the
assembled on the wrong side of the vehicle.
brakes are applied while semitrailer is moving in a
(4) Remove two dust covers from adjusting
forward direction. After servicing brakes or if wedge
slots in the dust shield.
assembly or plunger failure causes brakes to lock,
adjust brakes manually by following procedure (1)
(5) Insert brake adjusting spoon (S9523, op-
through (7) below.
tional spoon 2006, fig. 4-1) or long screw-driver into
(1) Jack or lift wheels free of ground with air
slot to meet adjusting bolt starwheel. Turn right
suspension control.
threaded adjusting bolt clockwise until a heavy
(2) Compress fail-safe unit per paragraph
drum drag develops. If adjusting bolt will not turn
d below.
using hand pressure, lightly tap tool with hammer.
(3) Remove dust plugs from access slots at top
(6) Back off the adjusting bolt to a very light
and bottom of dust shield and check brake drum to
drag on the drum and check brake lining clearance
brake lining clearance using feeler gage. If clearance
in accordance with (3) above.
is .040 to .060 inch, brakes are properly adjusted;
(7) Repeat procedure (4) through (6) above for
insert top and bottom dust plugs, release fail-safe
other shoe on brake.
unit and proceed to next brake unit. If clearance is
NOTE
out of .040 to .060 inch limits, proceed to (4) below.
Access to the lower adjusting bolts on
NOTE
semitrailer axle number six is limited by the
Starwheel adjusting bolts should be found
position of the walking beam.