August 2016
3 - 26 AL4 • AL4000 Part No. 218567
Section 3 • Scheduled Maintenance Procedures
C-3
Grease the Wheel Bearings
Axle specifi cations require that this procedure
be performed every 6000 miles or semi-annually,
whichever comes fi rst.
Maintaining the axle wheel bearings is essential
for safe machine operation and service life.
Operating the machine with loose or worn wheel
bearings may cause an unsafe operating condition
and continued use may result in component
damage. Extremely wet or dirty conditions or
regular steam cleaning and pressure washing of
the machine may require that this procedure be
performed more often.
1 Select a wheel. Chock the front and rear of the
tire at the opposite side of the machine.
2 Loosen the wheel lug nuts. Do not remove
them.
3 Place a lifting jack under the axle near the
wheel to be removed. Lift the axle until the
wheel is off the ground and place a jack stand
under the axle. Lower the axle onto the jack
stand and remove the wheel.
4 Remove the dust cap from the hub. Remove the
cotter pin from the castle nut.
5 Remove the castle nut and washer.
6 Pull the hub off of the spindle. The washer and
outer bearing should fall loose from the hub.
7 Place the hub on a fl at surface and gently pry
the bearing seal out of the hub. Remove the
rear bearing.
8 Pack both bearings with clean, fresh grease.
CHECKLIST C PROCEDURES
9 Inspect the hub for wear. Replace if necessary.
10 Place the large inner bearing into the rear of
the hub.
11 Install a new bearing grease seal into the hub
by pressing it evenly into the hub until it is fl ush.
Note: Always replace the bearing grease seal
when removing the hub.
12 Inspect the brake lining for wear (if equipped).
13 Inspect the brake cylinder for leaks (if
equipped).
14 Inspect the brake springs for wear or loss of
arch (if equipped).
15 Inspect the brake wiring/hoses for wear (if
equipped).
16 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.
17 Place the outer bearing into the hub.
18 Install the washer and castle nut.
19 Tighten the castle nut to 50 ft-lbs / 68 Nm to
seat the bearings.
20 Fully loosen the castle nut. Do not rotate the
hub.
21 Finger tighten the castle nut until snug.
22 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.
23 Install the dust cap, then the tire and wheel
assembly. Torque the wheel lug nuts to
specifi cation. Refer to Section 2, Specifi cations.
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