GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC C-Series Medium Duty Truck B7 🢒 General Information 🢒 General Information 🢒 Wheel Bearing Adjustment
  1. Set the parking brake.
  2. Block the vehicle rear wheels.
  3. Lift the vehicle frame until the front tire is off the ground.

    4. Notice: Perform the following steps before beginning any vehicle lifting or jacking procedure:

       • Remove or secure all of the vehicle's contents in order to avoid any shifting or any movement that may occur during the vehicle lifting or jacking procedure.
       • The lifting equipment or the jacking equipment weight rating must meet or exceed the weight of the vehicle and any vehicle contents.
       • The lifting equipment or the jacking equipment must meet the operational standards of the lifting equipment or jacking equipment's manufacturer.
       • Perform the vehicle lifting or jacking procedure on a clean, hard, dry, level surface.
       • Perform the vehicle lifting or jacking procedure only at the identified lift points. DO NOT allow the lifting equipment or jacking equipment to contact any other vehicle components.
    Failure to perform the previous steps could result in damage to the lifting equipment or the jacking equipment, the vehicle, and/or the vehicle's contents.

  4. Support the frame using suitable safety stands.

    5. Object Number: 201863 Size: MH
  5. Remove the bolts (1) and the washers (2). (The illustration shows a wheel hub with disc brakes, but you will perform the bearing adjustment in the same manner for any kind of axle.)
  6. Remove the hub cap (3) and the gasket (4). DO NOT allow the gasket material to fall into the hub, where applicable.
  7. Remove the cotter pin (6).

    8. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  8. Adjust the nut (5).

    9. Tighten
    Tighten the nut to 153 N·m (113 lb ft) while rotating the wheel 360 degrees in both directions. This rotation will correctly position the bearings.

    Important: Always back off the nut 1/4-1/6 turn. This adjustment should result in bearing end play of 0.025-0.200 mm (0.001-0.008 in).

  9. Back off the nut 1/4-1/6 turn until the slot in the nut lines up with hole in the spindle (16) of the steering knuckle.
  10. Install a new cotter pin (6). Bend the cotter pin for proper clearance of the rotating components.
  11. Install a new gasket (4) and align the gasket properly. Attach the hub cap (3).

    12. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  12. Install the hub cap bolts (1) with new washers (2).

    13. Tighten
    Tighten the hub cap bolts evenly to 13 N·m (115 lb in).


    Object Number: 201869 Size: SH
  13. Add new lubricant to the oil lubricated bearings only. Refer to Adding Lubricant to Hub Caps .
  14. Remove the safety stands.
  15. Lower the vehicle.