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 dust cap, cotter pin, nut and washer.
  8.  
  9. 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.
  10.  
  11. Using a hammer and drift, remove the bearing races from the hub. They are driven out from the inside out.
  12.  

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. Use a press and a 3 inch (76mm) diameter bar to install the inner race and outer race into position. If the bar diameter is bigger than 3 inch (76mm), it may damage the seal seat.
  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 until it is just snug-12 ft. lbs. (16 Nm). Back off the nut one full flat. If the hole in the spindle lines up with the slot in the nut, insert the cotter pin. If they do not line up, back off the nut until they do, but not more than one additional flat and install the cotter pin. There should be 0.0005-0.008 in. (0.013-0.20mm) end-play. This can be measured with a dial indicator, if you wish.
  18.  
  19. Replace the dust cap, caliper, wheel and tire.
  20.  

 
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