B
78
Repair and Service Manual
BRAKES
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
634756
Fig. 22 Checking Park Brake Latching Pressure
Brake Drum Removal and Installation
Remove dust cap (1) to gain access to castellated nut (2)
and cotter pin (3) (Ref. Fig. 23).
Fig. 23 Brake Assembly
Remove cotter pin (3) and castellated nut.
Do not apply the brake when removing the nut as the
shoes may not fully retract, preventing removal of the
brake drum.
Remove washer (4).
Slide brake drum (5) from the axle shaft. If required, tap
the drum with a plastic faced hammer to loosen it from the
axle shaft or use drum puller (P/N 15947-G1).
Use care when raising the adjuster arm. Excessive
force will damage the adjuster and necessitate both
wheel brake assemblies be replaced.
If the drum does not slide from the brake assembly, the
brake shoes must be retracted. Rotate the hub so that the
hole in the drum is in the six o’clock position which is
directly over the brake mechanism. Use a small straight
blade screwdriver to raise the adjuster arm
just above
the star wheel.
Loosen the star wheel to retract the brake shoes and
remove the brake drum.
Pay particular attention to location of inner brake drum
washer (6) inside brake drum. It may be on the axle
shaft or attached to the rear of the drum hub. This
washer must be reinstalled when brake is reassembled.
To install the brake drum, clean the axle shaft and the
splines on the brake drum to remove debris and grease.
Apply a small amount of anti-seize compound to the axle
spline.
Install the inner brake drum washer (6) and slide the
brake drum (5) into place.
Check to ensure the nose of drum hub is beyond the end
of the axle splines. If not, remove drum and install one
additional inner brake drum washer (total of 2) to obtain
required spacing.
Do not back off nut to install cotter pin.
Install the remaining hardware and tighten the nut to 80-
90 ft. lbs. (108 - 122 Nm) torque. Continue to tighten until
a new cotter pin can be installed through the castellated
nut and the hole in the axle. Maximum torque is 140 ft.
lbs. (190 Nm).
Wheel Brake Service
Wheel brake service consists of disassembly, cleaning,
inspection, lubrication and reassembly of the wheel
brake. Worn or damaged components must be replaced.
Wheel brake service is required periodically as a preven-
tive maintenance measure (see Periodic Service Sched-
ule in Section A). The wear rate of brake shoes and
required service intervals will vary based on usage, ter-
rain and other conditions.
Spherical Nut
Loosen Jam Nut
65 70 75
Front of Vehicle
NOTE:
Bottom pull brake drum
shown; some models
are top pull. They are
functionally the same.
3
5
1
2
4
6