Wheel Hub/Rotor Assembly - GMC 1986 P-Truck Service Manual

WHEEL HUB/ROTOR ASSEMBLY

Remove or Disconnect (Figures 32 and 33)
• Raise the vehicle and support it with suitable
safety stands. Remove the tire and wheel
assembly.
1. Caliper (142).
• Refer to BRAKES (SEC. 5).
NOTICE: Support the caliper with a piece of
wire to prevent damage to the brake line.
2. Wheel hub/rotor (154) (figures 32, 33).
• Retainer/cap (148).
• Cotter pin (149), nut (150) and washer (151).
• Pull the hub/rotor free from the spindle,
making sure the outer wheel bearing (152)
comes free.
• Do not damage the steering knuckle spindle
threads.
3. Inner wheel bearing (155).
• Pry out the seal (156).
4. Races.
• Drive out each race using a brass drift.
Clean
1. Grease from the hub/rotor (154) and steering
knuckle spindle.
• Grease from inside the hub.
2. Grease from the wheel bearings (152, 155) and
races.
• Use clean solvent and a small brush (no
loose bristles).
• Do not spin the wheel bearings with
compressed air to dry them—the wheel
bearings may be damaged.
Inspect
1. Wheel bearings (152, 155) and their races for
damage or wear.
• Refer to " Diagnosis of Wheel Bearings," in
this section.
• If either a bearing or its race is damaged or
worn, replace both.
2. Hub/rotor (154) for damage or wear.
• Check for out-of-round or scored conditions.
• Check for pitting or cracks.
• Repair or replace as necessary.
+«- Install or Connect (Figures 32 and 33)
Tools Required:
J-8092 Driver Handle
J-29040 Outer Bearing Race Installer
J-9746-02 Hub/Rotor Support
FRONT SUSPENSION 3C-35
NOTICE: Start the races squarely inside the
hub/rotor (154) to avoid distortion and
possible cracking.
1. Races into the hub/rotor (154).
• Place the hub/rotor on J-9746-02 and rest
this assembly on press bars.
• Use J-29040 to drive the outer bearing race
into position.
• Remove J-9746-02 and use a 7.6 cm (3 inch)
diameter bar, or equivalent tool to drive the
inner bearing race into position. If the bar is
larger than 7.6 cm (3 inches), it may damage
the bearing seal seat.
9
Im portant
• Use an approved high temperature front wheel
bearing grease to lubricate the bearings. Refer to
MAINTENANCE AND LUBRICATION (SEC. OB).
• Do not mix different greases as mixing may
change the grease's properties resulting in poor
performance.
2. Apply a thin film of grease to the steering knuckle
spindle at the outer wheel bearing seat and at the
inner wheel bearing seat, shoulder, and seal seat.
3. Put a small quantity of grease inboard of each
wheel bearing retainer/cap (148).
4. F ill each w heel b ea rin g (cone and ro lle r
assembly) full of grease.
• Use a cone-type grease machine that forces
grease into the bearing.
• If a cone-type grease m achine is not
available, pack the wheel bearing by hand.
• When packing the wheel bearing by hand,
work the grease into the bearings between
the rollers, cones, and the cage.
NOTICE: Failure to completely pack the wheel
bearing (cones, rollers, and cage) with grease
will result in premature wheel bearing damage
and/or wear.
5. Inner wheel bearing (155) into the hub/rotor (154).
• Put an a dd itio n a l q u a n tity of grease
outboard of this bearing.
6. New seal (156).
• Use a flat plate or block to install the seal to
insure it is flush with the hub/rotor flange.
• Lubricate the seal lip with a thin layer of
grease.
7. Hub/rotor (154).
• Do not damage the steering knuckle spindle
threads.
8. Outer wheel bearing (152).
• Slide it over the spindle until the wheel
bearing (152) fu lly seats against the
hub/rotor outer race.