Bearing Adjustment; Wheel Hub Bolt - GMC G Service Manual

11. Locking hub assembly (249).
• Refer to FRONT AXLE (SEC. 4C).
12. Caliper.
• Refer to HYDRAULIC FOUNDATION BRAKES
(SEC. 5A2).
13. Wheel and tire assembly.
• Lower the vehicle.

BEARING ADJUSTMENT

] Important
• The proper functioning of the front suspension cannot
be maintained unless the front wheel bearings are
correctly adjusted. The cones must be a slip fit on the
spindle and the inside diameter of the cones must be
lubricated to insure the cones will crfeep. The adjust­
ing nut must have a free-running fit on the spindle
threads.
l / | Adjust (Figure 49)
• Raise the vehicle and support it with safety stands.
1. Remove the locking hub assembly (249), lock nut
(250) and ring (251).
HO
Tighten
• Adjusting nut (252) to 60 N«m (50 ft. lbs.) while
rotating the hub/rotor; this will seat the bearings.
2. Back off the adjusting nut (252).
H Q Tighten
• For Automatic Hubs, torque the adjusting nut to
47 N«m (35 ft. lbs.) while rotating the wheel.
• For Manual Hubs, torque the adjusting nut to 60
N«m (50 ft. lbs.) while rotating the wheel.
3. Back off the adjusting nut (252).
• For Automatic hubs, back off 3/8 of a turn maxi­
mum.
• For Manual hubs, back off enough to free the
bearing.
4. Install the ring (251) and lock nut (250).
• Tang on the inside diameter of the ring must
pass onto the slot on the spindle (265).
• The hole in the ring must align with the pin on
the lock nut (250). Move the adjusting nut (252)
to align the pin.
HO
Tighten
• Lock nut (250) to 217 N«m (160 ft. lbs.)
minimum.
[ j§ | Measure
• Endplay in the hub/rotor assembly. It should be set
between 0.025 to 0.254 mm (0.001 to 0.010-inch).
FRONT SUSPENSION 3C-51
5. Install the locking hub assembly (249).
• Refer to FRONT DRIVING AXLE (SEC. 4C).
• Lower the vehicle.

WHEEL HUB BOLT

M Remove or Disconnect (Figure 55)
Tool Required:
J 9746-02 Hub/Rotor Support
1. Hub/rotor assembly from the vehicle.
• Refer to "Wheel Hub/Rotor Assembly," in this
section.
2. Wheel hub bolts (255) with a press.
• Support the hub/rotor using J 9746-02 to pre­
vent damage to the rotor face (figure 55).
• Do not damage the wheel mounting surface on
the hub/rotor flange.
A. Press Bars
255. Wheel Hub Bolt
Figure 55 — Removing the Hub Bolts
H Install or Connect (Figure 56)
Tool Required:
J 9746-02 Hub/Rotor Support
NOTICE: See " Notice" on page 3C-1 of this
section.
1. New serrated bolt (255) into the hole in the hub/rotor.
• Place four washers onto the bolt, then fasten a
nut onto the bolt until the nut bottoms on the
washers (figure 56).
L00596