GM Full-Size Trucks 1988-1998 Repair Information

Wheel Hub/Rotor and Bearing

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REMOVAL & INSTALLATION



  1. Raise and support the front end on jackstands.
  2.  
  3. Remove the wheel.
  4.  
  5. Dismount the caliper and wire it out of the way.
  6.  
  7. Remove the locking hub.
  8.  
  9. Remove the lock nut, ring and adjusting nut.
  10.  
  11. Remove the hub/rotor and outer bearing. Do not drop the wheel bearings. The inner bearing assembly will remain in the hub and may be removed after prying out the inner seal. Discard the seal.
  12.  
  13. Using a hammer and drift, remove the bearing races from the hub. They are driven out from the inside out.
  14.  

To install:
  1. Clean all parts in a non-flammable solvent and let them air dry. Never spin-dry a bearing with compressed air! Check for excessive wear and damage.
  2.  
  3. Apply a thin film of grease to the spindle at the outer wheel bearing seat and at the inner bearing seat, shoulder and seal seat.
  4.  
  5. Apply a small amount of grease inboard of each wheel bearing cup, inside the rotor/ hub assembly.
  6.  
  7. When installing new races, make sure that they are not cocked and that they are fully seated against the hub shoulder.
  8.  
  9. Pack both wheel bearings using high melting point wheel bearing grease for disc brakes. Ordinary grease will melt and ooze out ruining the pads. Bearings should be packed using a cone-type wheel bearing greaser tool. If one is not available they may be packed by hand. Place a healthy glob of grease in the palm of one hand and force the edge of the bearing into it so that the grease fills the bearing. Do this until the whole bearing is packed.
  10.  
  11. Lubricate the seal lip with a small amount of grease, then place the inner bearing in the hub and install a new inner seal. Use a flat plate to install the seal so it is flush with the hub/rotor flange.
  12.  
  13. Carefully install the wheel hub/rotor assembly.
  14.  
  15. Using your hands, firmly press the outer bearing into the hub. Install the adjusting nut.
  16.  
  17. Spin the wheel hub by hand and tighten the nut to 50 ft. lbs. (60 Nm). Back off the nut until it is loose. On models with automatic locking hubs, tighten the adjusting nut to 35 ft. lbs. (47 Nm) while rotating the hub by hand, back off the adjusting nut 3 / 8 of a turn. On models with manual locking hubs, tighten the adjusting nut to 50 ft. lbs. (60 Nm) while rotating the hub by hand, back off the adjusting nut enough to free the bearing.
  18.  
  19. Install the ring and the lock nut. The tang on the inside diameter of the ring must pass onto the slot on the spindle. Also the hole in the ring must align with the pin on the lock nut. Move the adjusting nut to align the pin. There should be 0.001-0.010 in. (0.025-0.254mm) end-play. This can be measured with a dial indicator, if you wish.
  20.  
  21. Install the lock nut and tighten to 160 ft. lbs. (217 Nm).
  22.  
  23. Install the locking hub assembly and the caliper.
  24.  
  25. Replace the wheel and tire and lower the vehicle.
  26.  

 
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