S10 Pickup, Sonoma 2000-2004

Wheel Bearings

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Adjustment




NOTE
The front wheel bearings on 2004-05 2WD vehicles are not adjustable. If the bearings become loose or make noise, they must be replaced.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove the dust cap from the hub.
  4.  
  5. Remove the cotter pin and loosen the spindle nut.
  6.  
  7. Spin the wheel forward by hand and torque the nut to 12 ft. lbs. (16 Nm) in order to fully seat the bearings and remove any burrs from the threads.
  8.  
  9. Back off the nut until it is just loose, then finger-tighten the nut.
  10.  
  11. Loosen the nut 1 / 4 - 1 / 2 turn until either hole in the spindle lines up with a slot in the nut, then install a new cotter pin. This may appear to be too loose, but it is the proper adjustment.
  12.  
  13. Proper adjustment creates 0.001-0.005 in. (0.025-0.127mm) endplay.
  14.  

The front wheel bearings are not adjustable. If the bearings become loose or make noise, they must be replaced.

Cleaning & Repacking



To lubricate each bearing, place a gob of grease in the palm of the hand, then scoop the bearing through the grease until it is well lubricated.

Removal & Installation



  1. Remove or disconnect the following:
    WARNING
    Be careful not to drop the outer wheel bearing. As the hub is pulled forward, the outer wheel bearings will often fall forward and they may easily be removed at this time.



    Wheel
     
    Brake caliper with the pads without disconnecting the brake line
     
    Grease cap
     
    Cotter pin, spindle nut and washer
     
    Hub
     



    Outer roller bearing assembly
     
    Inner seal by prying it out of the hub and discard it
     
    Inner bearing assembly
     

  2.  

To install:

  1. Clean all parts in solvent and allow to air dry, then check for excessive wear or damage. Inspect all of the parts for scoring, pitting or cracking and replace if necessary.
    NOTE
    DO NOT remove the bearing races from the hub, unless they show signs of damage.

  2.  
  3. If it is necessary to remove the wheel bearing races, use the GM Front Bearing Race Removal tool J-29117 to drive the races from the hub/disc assembly. A hammer and brass drift may also be used to drive the races from the hub, but the race removal tool is quicker.
  4.  
  5. If the bearing races were removed, position the replacement races in the freezer for a few minutes and then install them to the hub:
    1. Lightly lubricate the inside of the hub/disc assembly using wheel bearing grease.
    2.  
    3. Using the GM Seal Installation tools J-8092 and J-8850, drive the inner bearing race into the hub/disc assembly until it seats. Be sure the race is properly seated against the hub shoulder and is not cocked.
      NOTE
      When installing the bearing races, be sure to support the hub/disc assembly with GM tool J-9746-02.

    4.  
    5. Using the GM Seal Installation tools J-8092 and J-8457, drive the outer race into the hub/disc assembly until it seats.
    6.  

  6.  
  7. Using a high melting point wheel bearing grease, lubricate the bearings, races and spindle; be sure to place a gob of grease (inside the hub/disc assembly) between the races to provide an ample supply of lubricant.
    NOTE
    To lubricate each bearing, place a gob of grease in the palm of the hand, then scoop the bearing through the grease until it is well lubricated.

  8.  
  9. Place the inner bearing in the hub, then apply a thin coating of grease to the sealing lip and install a new inner seal, making sure the seal flange faces the bearing cup.
    NOTE
    Although a seal installation tool is preferable, a section of pipe with a smooth edge or a suitably sized socket may be used to drive the seal into position. Be sure the seal is flush with the outer surface of the hub assembly.

  10.  
  11. Install or connect the following:

    Wheel hub over the spindle
     
    Outer bearing into the hub by hand
     
    Spindle washer and nut
     
    Brake caliper
     
    Wheel
     

  12.  
  13. Properly adjust the wheel bearings
  14.  
  15. Install or connect the following:

    New cotter pin
     
    Dust cap
     
    Wheel cover

    Click image to see an enlarged view

    Fig. Wheel bearings, races and related components-2000-03 2WD vehicles

     

  16.  

  1. Raise and support the vehicle.
  2.  
  3. Remove the tire and wheel.
  4.  
  5. Remove the brake rotor.
  6.  
  7. Remove the wheel speed sensor mounting bolt from the wheel hub and bearing.
  8.  
  9. Remove the wheel speed sensor from the wheel hub and bearing.
  10.  
  11. Remove the wheel hub and bearing-to-steering knuckle mounting bolts.
  12.  
  13. Remove the wheel hub and bearing from the steering knuckle.
  14.  
  15. Remove the splash shield from the steering knuckle.
  16.  
  17. Remove the wheel hub seal.
  18.  

To install:

  1. Install the wheel hub seal.
  2.  
  3. Install and align the splash shield to the steering knuckle.
  4.  
  5. Install the wheel hub and bearing assembly to the steering knuckle. Align the threaded holes.
  6.  
  7. Install the mounting bolts and tighten to 77 ft. lbs. (105 Nm).
  8.  
  9. Install the wheel speed sensor and tighten to 13 ft. lbs. (18 Nm).
  10.  
  11. Install the rotor.
  12.  
  13. Install the tire and wheel.
  14.  
  15. Lower the vehicle.
  16.  

  1. Install Torsion Bar Unloading tool J 36202 on the torsion bar adjusting bolt and remove the bolt. To aid during installation, count the number of turns required to remove the bolt.

    Click image to see an enlarged view

    Fig. Use Torsion Bar Unloading tool J 36202 to remove the adjusting bolt and unload the torsion bar

  2.  
  3. Remove the wheel.
  4.  
  5. Install an axle shaft boot seal protector to the Tri-pot axle joint.
  6.  
  7. Remove or disconnect the following:
    NOTE
    Be sure the brake line is not stretched or damaged.



    Cotter pin and retainer
     
    Castle nut and the thrust washer
     
    Brake caliper and support it aside using wire or a coat hanger
     



    Brake disc from the wheel hub
     
    Halfshaft from the hub/bearing assembly, using a Spindle Remover tool J-28733-A to prevent damage to the shaft or hub/bearing assembly
     
    Hub/bearing assembly from the knuckle
     

  8.  
  9. Clean and inspect the parts for nicks, scores and/or damage, then replace them as necessary.
  10.  

To install:

  1. Install or connect the following:

    Hub and bearing assembly by aligning the threaded holes. Torque the bolts to 77 ft. lbs. (105 Nm).
     
    Tie rod end to the steering knuckle using the retaining nut
     
    New cotter pin
     
    Brake assembly
     
    Halfshaft nut. Tighten the nut to 103 ft. lbs. (140 Nm).
     
    Retainer and a new cotter pin but DO NOT back off specification in order to insert the cotter pin.
     

  2.  
  3. Remove the torsion bar unloader tool and the drive axle boot protector.
  4.  
  5. Install the wheel.
  6.  
  7. Check and/or adjust the vehicle trim height, as necessary.

    Click image to see an enlarged view

    Fig. Hub and bearing assembly-4WD vehicles

  8.  

 
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