SERVICE MANUAL
Anchor Pins
The anchors should be inspected for signs of wear. In
most cases, rust will be the factor in servicing brake
anchors. Clean all dirt and rust from anchors and coat
them with a very light coat of lubricant. Refer to
LUBRICATION, section, Brakes, for type of lubricant.
If anchor pins are worn, they must be replaced. Anchor
pins may be replaced on all brake groups except Eaton
(Fig. 18). Eaton anchor pins are staked in place and are
replaced with spider.
Brake Shoe Return Springs
Inspect brake shoe return springs for distortion, such as
nicks, twisted shanks or spread coils. Damaged springs
must be replaced. It is suggested that shoe return
springs be replaced when shoes or shoe lining are
replaced.
Backing Plate end Dust Shields
Inspect backing plates and dust shields. If bent or
twisted, they must be replaced.
Spider
Inspect spider for damage. If any cracks are found, the
spider must be replaced.
Camshaft Bushings and Rollers
Clean all dirt and rust from rollers and camshaft. In most
cases, rust will be the factor in servicing rollers. Check
for dirt in splines on camshaft. Remove any small burrs
from camshaft assembly to avoid damage to seals when
shaft is reinstalled.
Inspect camshaft, camshaft bushings or bearings and
brake shoe rollers. If noticeable signs of wear exist,
replace worn parts.
Do not remove camshaft bushings from spider and/or
mounting bracket unless replacement is necessary.
Apply a very light coat of lubricant to camshaft assembly
and rollers. Refer to LUBRICATION section for type of
lubricant.
For detailed servicing instructions pertaining to camshaft
and bushings, refer to SERVICING BRAKE GROUP
COMPONENTS in this section.
REASSEMBLY
The reassembly instructions contained herein have been
arranged as follows:
Install Wheel, Hub and Drum
Brake Groups with Backing Plate
Brake Groups with Spiders
Install Wheel, Hub and Drum
After various components of the brake assemblies have
been serviced, brakes are reassembled by reversing the
disassembly procedure.
It is recommended that newly installed brake lining be
circle ground before installing brake drums. Circle
grinding lining to fit drum assures full contact between
lining and drum. Refer to RECONDITIONING BRAKE
DRLUS AND SHOES section.
When reassembling various components which are
secured with bolts and/or nuts such as backing plates,
spiders, camshaft brackets or anchor pins, refer to
applicable ’ORQUE CHART.
Brake shoes must be properly located to provide
designed efficiency of brake group. The primary
(forward) shoe is the first shoe just past the cam in
forward direction of wheel rotation.
Brake shoes with combination brake blocks sets of semi-
metallic and organic lining must be installed as shown in
Figures 19 and 20.
The brake blocks on each shoe consist of one semi-
metallic material (shaded area) and one block of organic
material (unshaded area).
The semi-metallic material is identified by the metal
particles embedded in the brake block. The organic
material will not have the visable metal particles.
Brake Groups with Backing Plate
Rockwell “T” Series Brake Group
The Rockwell “T” Series brake group will be
reassembled in the same manner as the Wagner
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