Disassembly (Fig. 20)
Remove auto adjust spring and shoe–to–shoe
3. Inspect backing plate surfaces, which contact with
the brake shoes for grooves that may restrict shoe
movement. Replace plate if grooves can not be re-
moved by light sanding with emery cloth or other suit-
able abrasive. Replace plate if cracked, warped, or
excessively rusted.
1.
springs from brake shoes.
2.
Remove hold down pins and shoe cups securing the
brake shoes to the backing plate.
Remove brake shoes from backing plate.
Inspection (Fig. 18 and 20)
Inspect brake drums.
4.
Replace entire brake assembly if deformation or exces-
sive rust is found.
Inspect anchor abutment and rivets for deformation.
3.
5.
corroded, bent, or fatigued.
Replace adjuster screw and shim washers if rusted,
1.
IMPORTANT:Brake drum machining is not recom-
mended. Replace brake drums as a set to maintain
equal braking forces.
6.
Replace brake cables if frayed, stretched, or kinked.
Assembly (Fig. 20)
A. Clean drums with denatured alcohol. Check
braking surface diameter in at least three places. If
the diameter exceeds 6.320 inches (16.05 cm), re-
place both brake drums.
IMPORTANT:Brake shoe lining surfaces must be
free of grease, oil, and other foreign matter.
1.
Apply a light film of lubricant to the following:
B. Replace drums that are cracked, deeply grooved,
tapered, significantly out–of–round, scored, exces-
sively rusted, or heat spotted.
A. Surfaces of the shoe web that contact the back-
ing plate, push rod, and adjusting screw.
B. Six ledges on which the brake shoes rest.
C. Entire surfaces of PTFE coated washers.
D. Entire surface of pivot pin.
C. Minor scoring can be removed with sandpaper.
2.
Inspect brake shoe linings.
IMPORTANT:Replace brake shoes as a set (all four
shoes) to maintain equal braking forces.
E. Slot in push rod that contacts actuator lever.
A. Replace brake shoes if damaged or if lining is
worn to 1/16” (1.6 mm). Replace if lining is contami-
nated by oil, grease, or other fluids.
F. Surfaces of adjusting lever that contact wave
washer, washer, and pivot pin.
G. Surfaces of the actuator bracket that contact the
star wheel of the adjusting screw.
NOTE: Overheated springs lose their tension, and can
cause brake linings to wear out prematurely.
2.
Position brake shoes to backing plate. Secure shoes
B. Inspect brake shoe webbing, shoe–to–shoe
springs, and auto adjust spring for overheating.
Overheating is indicated by a slight blue color. In-
spect brake shoe webbing for deformation. Replace
parts as necessary.
to plate with shoe cups and hold down pins.
3.
Secure brake shoes with shoe–to–shoe springs and
auto adjust spring.
C. Inspect hold down pins and shoe cups for bends,
rust, and corrosion. Replace as necessary.
Workman 1100/1110/2100/2110
Page 7 – 29 (Rev. D) Chassis, Wheels, and Brakes (Rev. B)
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