Reinstall slack adjuster retaining ring.
Reinstall wheel and drum assembly and
adjust wheel bearings.
Adjust brakes as instructed elsewhere in
Brake Groups with Spiders
Three variations will be found in brake groups with
Eaton (Fig. 7) with fixed anchor pin and open end shoes.
Rockwell "P" Series (Fig. 8) with two removable anchor
pins and closed ends on shoes.
Rockwell "Q" Series (Fig. 12) with two removable anchor
pins and open ends on shoes.
Lubricate camshaft bushings with lubricant
listed in LUBRICATION section, Brakes.
spacer washers are assembled in reverse
sequence when removed.
Install anchor pins if removed (Rockwell "P"
and "Q" Series brake groups).
"P" Series - Position shoes in place on
spider then push the pin through shoe and
into spider. Repeat anchor pin installation
on remaining shoe. Install felt seals, seal
retainers and lock rings on anchor pins.
Also be sure return spring links are
positioned between shoe webs.
It is important that anchor pins which are
secured with lock bolts, are positioned so
that flats are aligned with bolt openings and
tightened bolts to 85-120 N.m (19-27 ft.
lbs.). Install lock wires.
"Q" Series - Anchor pins are held in place
by the shoes, eliminating snap rings, felts
and set screws.
On brake groups with open end anchor
ends on shoes, position shoes on anchors
and install shoe retaining springs at anchor
end of shoes.
Install brake shoe return springs.
Pry each shoe (one at a time) away from
cam and install rollers. If rollers have
retainers, be sure they are hooked on the
Reassemble slack adjusters on camshaft
aligning scribe marks and repositioning
spacer washers to the same location when
Spacer washers are to be positioned
to provide a maximum end pay of 1.59
Adjuster screw may be either facing
toward or away from brake chamber
accessibility. In most instances, the
adjuster screw will be facing away
Install slack adjuster retaining ring. Make
sure that the retaining ring is of correct
thickness. Two variations of ring grooves
will be found; namely 1.5875 mm (1/16)
and 3.1750 mm (1/8). The proper ring
thickness must be used in the camshaft
Install brake chamber if removed.
10. Reinstall wheel and drum assembly and
adjust wheel ring.
11. Adjust brakes as outlined in BRAKE
SERVICING FOUNDATION BRAKE
DRUM AND SHOES
For complete details covering servicing of brake drums
RECONDITIONING DRUMS AND SHOES.
Anchor pins provide a point where shoes can be secured
to backing plate or spider and also permit positioning
shoe in respect to drum.
Anchor pins are designed to withstand all braking force
of slowing or stopping the vehicle.
Anchor pins which are secured to the backing plate with
a lock washer and nut are replaced by using two
wrenches; one wrench is positioned on the nut while the
second wrench is positioned over the flats on threaded
area on anchor pin. Refer to TORQUE CHART for
specified torque value.
If fixed anchor pins (Fig. 18) become worn, the complete
spider replacement will be necessary.
Anchor pins in spiders which are removable
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