Disassembly (Fig. 5 and 6)
Partially loosen wheel nuts then jack up and support
B. Replace drums if they are cracked or heat
spotted.
1.
vehicle (see Jacking Instructions in Operator’s Manual).
Remove wheel nuts and then remove wheel.
C. Scoring, grooves, taper, out of round and glazing
can be machined out as long as the oversize limit is
not exceeded. Minor scoring or glazing can be re-
moved with sand paper.
2.
If servicing rear brakes, loosen set screw on parking
brake control lever knob. Turn knob on parking brake le-
ver counterclockwise all the way to loosen parking brake
cable adjustment.
IMPORTANT: If one drum is machined, the drum on
the opposite side should be machined to the same
diameter to maintain equal braking forces.
NOTE: It may be necessary to back off adjuster to re-
move brake drum. To back off adjuster, rotate brake
drum until access hole lines up with bolt adjuster on ad-
juster assembly. Use a hooked piece of wire to pull pawl
away from bolt adjuster, then turn bolt adjuster.
D. Wipe braking surface of drum after machining
with a cloth soaked in denatured alcohol.
2.
Inspect brake shoe and lining set (13).
IMPORTANT: Shoe and lining sets should be re-
placed for both wheels on the axle. Equal braking
forces must be maintained.
3.
Remove brake drum.
4.
If servicing front brakes, remove wheel hub from ve-
hicle (see Front Wheel Assembly (2 Wheel Drive) in this
section for series 3000 Workman vehicle or see Front
Wheel and Axle Housing Assembly in the Service and
Repairs section of Chapter 10 – Front Wheel Drive
A. Replace if linings are excessively worn or dam-
aged. Oil, grease or brake fluid contamination is not
acceptable.
(4WD)
for series 4000 Workman vehicle).
B. Replace if shoe webbing show signs of overheat-
ing as indicated by a slight blue color.
5.
If servicing rear brakes, remove stub axle from ve-
hicle (see Stub Axle and Drive Shaft Service in the Ser-
vice and Repairs section of Chapter 6 – Drive Train).
3.
(23)
Inspect hold down washer (22), hold down spring
and hold down pin (26). Replace parts if rusted, cor-
roded or bent. Replace washers and springs if they are
unable to lock onto the pin.
6.
and then lower shoe spring (15).
Remove upper shoe spring (14), adjuster spring (20)
NOTE: The adjuster assembly (27) consists of the fe-
male push rod (16), bolt adjuster (17) and adjuster
sleeve (18).
7
1
7.
springs (23) from the hold down pins (26). Remove
brake shoes (13), pawl (19) and adjuster assembly (27).
Remove hold down washers (22) and hold down
4
4
8.
cable from parking brake lever.
If servicing rear brakes, disengage parking brake
8
2
6
9.
See Brake Cylinder Service in this section for infor-
3
mation on brake cylinder disassembly, inspection and
assembly procedures.
10.If
needed, remove brake backing plate from vehicle
by removing four cap screws and lock washers.
5
5
Inspection
Figure 6
1.
moved for brake service.
Clean and inspect brake drum any time they are re-
1.
2.
3.
4.
Upper shoe spring
Adjuster spring
Lower shoe spring
Hold down washer
5.
6.
7.
8.
Brake shoe
Adjuster assembly
Brake cylinder assy
Pawl
A. Check drum diameter at a minimum of three loca-
tions. Diameter should not exceed the over size limit
cast into the outside of the drum. Replace drum if lim-
it is exceeded.
Workman 3000/4000 Series
Page 7 – 15
Chassis
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