B
BRAKES
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
39
Repair and Service Manual
699322
Figure 19 Checking Parking Brake Latching Pressure
11. Perform the Periodic Brake Performance Test as
described and return the vehicle to service if brake
performance is satisfactory.
Brake Drum Removal and Installation
1.
Remove the dust cap (1) to gain access to the cas-
tellated nut (2) and the cotter pin (3) (Figure 20).
Figure 20 Brake Assembly
2.
Remove the cotter pin and castellated nut as shown.
NOTICE: Do not apply the brake when removing the
nut as the shoes may not fully retract preventing
removal of the brake drum.
3.
Remove washer (4) and spindle cap adapter (7).
4.
Slide the 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 15947G1).
Use care when raising the adjuster
arm. Too much force will damage
the adjuster and require that both
wheel brake assemblies be replaced.
5.
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 posi-
tion which is directly over the brake mechanism. Use
a small straight blade screwdriver to raise the
adjuster arm
just above
the star wheel.
6.
Loosen the star wheel to retract the brake shoes and
remove the brake drum.
NOTICE: Pay particular attention to the location of
the inner brake drum washer (6) inside the brake
drum, which may be on the axle shaft or attached to
the rear of the drum hub. This washer must be rein-
stalled when the brake is reassembled.
7.
To install the brake drum, clean the axle shaft and
the splines on the brake drum to remove dirt, grease
and foreign matter.
8.
Apply a small amount of anti-seize compound to the
axle spline.
9.
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.
10. 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. Maxi-
mum torque is 140 ft. lbs. (190 Nm).
Wheel Brake Service
Wheel brake service consists of disassembly, cleaning,
inspection, lubrication and re-assembly of the wheel
brake. Worn or damaged components must be replaced.
Wheel brake service is required periodically as a preven-
tive maintenance measure (see SCEDULED MAINTE-
NANCE CHART section). The wear rate of brake shoes
and required service intervals will vary based on usage,
terrain and other conditions. It is recommended that
wheel brake service be performed periodically on a sam-
ple of vehicles within the service fleet to establish the
most efficient and effective service interval.
1.
Remove the brake drum as described in ‘Brake
Drum Removal and Installation’.
65 70 75
Use a 'bathroom' scale
to confirm the latching force
required to engage and latch
the parking brake.
If required adjust spherical nut
to achieve correct parking brake
latching pressure of 65 - 75 lbs.
(29 - 34 kg).
Loosen Jam Nut
Front of Vehicle
1
5
6
3
4
2
7
