Service Manual

Disassembly (Fig. 6 and 7)
Note: The front brake assembly may be
disas-
sembled as necessary for inspection and repairs.
1. Remove upper shoe spring (14), adjuster spring
(20), and then lower shoe spring (15).
Note: The adjuster assembly (27) consists of the fe-
male push rod (16), bolt adjuster (17), and adjuster
sleeve (18).
2. Remove hold down washers (22) and hold down
springs
(23) from the hold down pins (26). Remove
brake shoes (13), pawl (19), and adjuster assembly
(27).
Note: T
he brake cylinder assembly consists of the fol-
lowing: bleed screw (4), bleed screw cap (5), body (6),
spring (9), L–type seals (10), pistons (11), and dust cov-
ers (12)
3. Disassemble brake cylinder assembly as follows:
A. Remove both cap screws and lock washers (1)
from the back plate (2) and body (6). Remove brake
cylinder assembly
.
B. Remove dust covers (12) and pistons (11) from
the body
. make sure not to lose the spring (9).
C. Remove L–type seals (10) from the pistons.
Dis-
card seals and dust covers.
Inspection (Fig. 6)
1. Clean and inspect brake drum (2) any time they are
removed for brake service (Fig. 2).
A. Check drum diameter at a minimum of three
locations.
Diameter should not exceed the over size
limit cast into the outside of the drum. Replace drum
if limit is exceeded.
B. Replace drums if they are cracked or heat
spotted.
C. Scoring, grooves, taper, out of round, and glaz-
i
ng can be machined out as long as the oversize lim-
it is not exceeded. Minor scoring or glazing can be
removed with sand paper.
IMPORTANT: If one drum is machined, the drum on
the opposite side should be machined to the same
diameter to maintain equal braking forces.
D. Wipe braking surface of drum after machining
with a cloth soaked in denatured alcohol.
6
5
4
1
3
2
7
8
Figure 7
1. Upper shoe spring 5. Brake shoe
2. Adjuster spring 6. Adjuster
assembly
3. Lower shoe spring 7.
Brake cylinder assy
4. Hold down washer 8. Pawl
2. Inspect shoe and lining set (13).
IMPORTANT:Shoe and lining sets (13) should be re-
placed for each wheel on the axle. Equal braking
forces must be maintained.
A. Replace if linings are excessively worn or dam-
aged. Oil, grease, or brake fluid contamination is not
acceptable.
B. Replace if shoe webbing show signs of over-
heating as indicated by a slight blue color
.
3. Inspect hold down washer (22), hold down spring
(23), and hold down pin (26). Replace parts if rusted,
corroded, or bent. Replace washers and springs if they
are unable to lock onto the pin.
4. Inspect upper shoe spring (14), lower shoe spring
(15), and adjuster spring (20).
A. Replace if springs show signs of overheating as
indicated b
y a slight blue color. Over heated springs
lose their pull and could cause brake linings to wear
out prematurely.
B. Replace sagging, bent, or externally damaged
springs.
5. Inspect back plate (2).
A. Replace if shoe contact surfaces have grooves
that may restrict shoe movement and can not be
re-
moved by sanding lightly with emery cloth.
B. Replace if cracked, warped, or excessively
rusted.
Front Wheel Drive
Section (4WD)
Workman 4000 Series Page 10 – 9
Rev. B
Front Wheel Drive Section (4WD)