August 2016
3 - 22
AL4 • AL4000
Part No. 218567
Section 3 • Scheduled Maintenance Procedures
11 Tighten the castle nut to 50 ft-lbs / 68 Nm to
seat the bearings.
12 Fully loosen the castle nut. Do not rotate the
hub.
13 Finger tighten the castle nut until snug.
14 Install a new cotter pin. Bend the cotter pin
to lock it in place.
Note: Always replace the cotter pin with a new one
when removing the castle nut.
15 Install the dust cap, then the tire and wheel
assembly. Torque the wheel lug nuts to
specifi cation. Refer to Section 2,
Specifi cations
16 Working from the back side of the wheel at the
brake backing plate, locate and remove the
small rubber plug from the lower side of the
backing plate to access the star-shaped brake
adjuster wheel. Set the plug to the side.
17 Insert a brake adjuster tool into the opening of
the brake backing plate, engaging it with the
teeth of the brake adjuster wheel. Move the tip
of the adjuster tool in an upwards direction to
tighten the brakes.
Note: It may be helpful to use a fl ashlight when
locating the brake adjuster wheel.
18 Repeatedly move the tip of the adjuster tool in
an upwards direction to tighten the brakes until
the wheel locks up and will no longer turn.
Note: This centers the brake shoes on the brake
drum, ensuring the shoes are positioned correctly.
6 Pull the hub off of the spindle. The washer and
outer bearing should fall loose from the hub.
7 Inspect the brake lining for wear (if equipped).
Result: The thickness of the brake lining is
greater than
1
/
16
inch / 1.6 mm. The brake shoes
are good.
Result: The thickness of the brake lining is
1
/
16
inch / 1.6 mm or less. The brake shoes
must be replaced and the brake drums must
inspected for wear, scoring and other damage.
Note: The maximum bore of a good brake drum
shall not be greater than 0.090 inch / 2.29 mm in
excess of the drum diameter.
Note: If drum resurfacing is required, the brake
drum should be resurfaced to a 120 micron fi nish.
Note: If replacing the brake shoes, apply a light
coating of grease or anti-seize compound to the
brake anchor pin, arm bushing and pin, and areas
of the backing plate which contact the magnet arm
and brake shoes frame. Apply a small amount of
lube to the actuating cam at the top of the magnet
arm. Do not allow grease or oil to contact the
brake shoes or the inside of the drum.
8 Slide the hub onto the yoke spindle.
Component damage hazard.
Do not apply excessive force or
damage to the lip of the seal may
occur.
9 Place the outer bearing into the hub.
10 Install the washer and castle nut.
CHECKLIST B PROCEDURES
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