GM S-Series Pick-ups and SUV's 1994-1999 Repair Guide

Front Wheel Bearings

Imprimir

See Figure 1



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Fig. Fig. 1: Exploded view of a common 2WD front hub and bearing assembly

Only the front wheel bearings on 2WD models require periodic maintenance. A premium high melting point grease meeting GM part number 1052497 or its equivalent, must be used. Long fiber type greases must not be used. This service is recommended at the intervals in the Maintenance Intervals Chart or whenever the truck has been driven in water up to the hubs.

Before handling the bearings, there are a few things that you should remember to do and not to do.

Remember to do the following:


Remove all outside dirt from the housing before exposing the bearing.
 
Treat a used bearing as gently as you would a new one.
 
Work with clean tools in clean surroundings.
 
Use clean, dry canvas gloves, or at least clean, dry hands.
 
Clean solvents and flushing fluids are a must.
 
Use clean paper when laying out the bearings to dry.
 
Protect disassembled bearings from rust and dirt. Cover them up.
 
Use clean rags to wipe bearings.
 
Keep the bearings in oil-proof paper when they are to be stored or are not in use.
 
Clean the inside of the housing before replacing the bearing.
 

Do not do the following:


Don't work in dirty surroundings.
 
Don't use dirty, chipped or damaged tools.
 
Try not to work on wooden work benches or use wooden mallets.
 
Don't handle bearings with dirty or moist hands.
 
Do not use gasoline for cleaning; use a safe solvent.
 
Do not spin-dry bearings with compressed air. They will be damaged.
 
Do not spin dirty bearings.
 
Avoid using cotton waste or dirty cloths to wipe bearings.
 
Try not to scratch or nick bearing surfaces.
 
Do not allow the bearing to come in contact with dirt or rust at any time.
 

REMOVAL, PACKING & INSTALLATION



Sodium-based grease is not compatible with lithium-based grease. Read the package labels and be careful not to mix the two types. If there is any doubt as to the type of grease used, completely clean the old grease from the bearing and hub before replacing.

2-Wheel Drive Models

See Figures 2 through 15



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Fig. Fig. 2: Pry the dust cap from the hub, taking care not to distort or damage its flange



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Fig. Fig. 3: Once the bent ends are cut, grasp the cotter pin and pull or pry it free of the spindle



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Fig. Fig. 4: If difficulty is encountered, gently tap on the pliers with a hammer to help free the cotter pin



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Fig. Fig. 5: Loosen and remove the castellated nut from the spindle



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Fig. Fig. 6: Remove the washer from the spindle



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Fig. Fig. 7: With the nut and washer out of the way, the outer bearing may be removed from the hub



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Fig. Fig. 8: Pull the hub and inner bearing assembly from the spindle



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Fig. Fig. 9: Use a small prytool to remove the old inner bearing seal



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Fig. Fig. 10: With the seal removed, the inner bearing may be withdrawn from the hub



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Fig. Fig. 11: Thoroughly pack the bearing with fresh, high temperature wheel-bearing grease before installation



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Fig. Fig. 12: Apply a thin coat of fresh grease to the new inner bearing seal lip



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Fig. Fig. 13: Use a suitably sized driver to install the inner bearing seal to the hub



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Fig. Fig. 14: Tighten the nut to specifications while gently spinning the wheel, then adjust the bearing



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Fig. Fig. 15: After the bearings are adjusted, install the dust cap by gently tapping on its flange

  1. Raise and support the front of the vehicle safely using jackstands.
  2.  
  3. Remove the tire and wheel assembly.
  4.  
  5. Remove the brake caliper mounting bolts and carefully remove the caliper (along with the brake pads) from the rotor. Do not disconnect the brake line; instead wire the caliper out of the way with the line still connected. Refer to Brakes of this repair guide for this procedure.
  6.  
  7. Carefully pry out the grease cap, then remove the cotter pin, spindle nut, and washer.
  8.  
  9. Remove the hub, being careful not to drop the outer wheel bearings. As the hub is pulled forward, the outer wheel bearings will often fall forward and they may easily be removed at this time.
  10.  
  11. If not done already, remove the outer roller bearing assembly from the hub. The inner bearing assembly will remain in the hub and may be removed from the rear of the hub after prying out the inner seal with a small prybar. Discard the seal after removal.
  12.  

To install:
  1. Clean all p