Jeep CJ 1945-1970 Repair Information

Front Hub and Wheel Bearings

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REMOVAL, REPACKING AND INSTALLATION



Non-Locking Hubs

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.

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.
 

4-WHEEL DRIVE VEHICLES

See Figures 1 through 8



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Fig. Fig. 1: Exploded view of the front wheel hub and bearings-4WD models with drum brakes



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Fig. Fig. 2: After removing the wheel, loosen the hub nut



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Fig. Fig. 3: Remove the hub nut and flat washer ...



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Fig. Fig. 4: ... followed by the bearing adjusting nut ...



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Fig. Fig. 5: ... and the adjusting nut's flat washer



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Fig. Fig. 6: Remove the outer bearing, then pull the drum off of the axle shaft



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Fig. Fig. 7: Use a seal remover to extract the old hub's inner seal



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Fig. Fig. 8: Once the seal is pried out, the inner bearing can be removed

  1. Raise the front of the vehicle and place jackstands under the axle.
  2.  
  3. Remove the wheel.
  4.  
  5. Remove the front hub grease cap and driving hub snapring. On models equipped with locking hubs, remove the retainer knob hub ring, agitator knob, snapring, outer clutch retaining ring and actuating cam body.
  6.  
  7. Remove the splined driving hub and the pressure spring. This may require slight prying with a screwdriver.
  8.  
  9. Remove the external snapring from the spindle shaft and remove the hub shaft drive gear.
  10.  
  11. Remove the wheel bearing locknut, lockring, adjusting nut and inner lockring.
  12.  
  13. On vehicles with drum brakes, remove the hub and drum assembly. This may require that the brake adjusting wheel be backed off a few turns. The outer wheel bearing and spring retainer will come off with the hub.
  14.  
  15. On vehicles with disc brakes, remove the caliper and suspend it out of the way by hanging it from a suspension or frame member with a length of wire. Do not disconnect the brake hose, and be careful to avoid stretching the hose. Remove the rotor and hub assembly. The outer wheel bearing and, on vehicles with locking hubs, the spring collar, will come off with the hub.
  16.  
  17. Carefully drive out the inner bearing and seal from the hub, using a wood block.
  18.  
  19. Inspect the bearing races for excessive wear, pitting or grooves. If they are cracked or grooved, or if pitting and excess wear is present, drive them out with a drift or punch.
  20.  
  21. Check the bearing for excess wear, pitting or cracks, or excess looseness.
  22.  

If it is necessary to replace either the bearing or the race, replace both. Never replace just a bearing or a race. These parts wear in a mating pattern. If just one is replaced, premature failure of the new part will result.

  1. If the old parts are retained, thoroughly clean them in a safe solvent and allow them to dry on a clean towel. Never spin dry them with compressed air.
  2.  
  3. On vehicles with drum brakes, cover the spindle with a cloth and thoroughly brush all dirt from the brakes. Never blow the dirt off the brakes, due to the presence of asbestos in the dirt, which is harmful to your health when inhaled.
  4.  
  5. Remove the cloth and thoroughly clean the spindle.
  6.  
  7. Thoroughly clean the inside of the hub.
  8.  
  9. Pack the inside of the hub with EP wheel bearing grease. Add grease to the hub until it is flush with the inside diameter of the bearing cup.
  10.  
  11. Pack the bearing with the same grease. A needle-shaped wheel bearing packer is best for this operation. If one is not available, place a large amount of grease in the palm of your hand and slide the edge of the bearing cage through the grease to pick up as much as possible, then work the grease in as best you can with your fingers.
  12.  
  13. If a new race is being installed, very carefully drive it into position until it bottoms all around, using a brass drift. Be careful to avoid scratching the surface.
  14.  
  15. Place the inner bearing in the race and install a new grease seal.
  16.  
  17. Place the hub assembly onto the spindle and install the inner lockring and outer bearing. Install the wheel bearing nut and torque it to 50 ft. lbs. (68 Nm) while turning the wheel back and forth to seat the bearings. Back off the nut about 1 / 4 turn (90°) maximum.
  18.  
  19. Install the lockwasher with the tab aligned with the keyway in the spindle and turn the inner wheel bearing adjusting nut until the peg on the nut engages the nearest hole in the lockwasher.
  20.  
  21. Install the outer locknut and torque it to 50 ft. lbs. (68 Nm).
  22.  
  23. Install the spring collar, drive flange, snapring, pressure spring, and hub cap.
  24.  
  25. Install the caliper over the rotor.
  26.  

2-WHEEL DRIVE VEHICLES

See Figure 9



Click image to see an enlarged view

Fig. Fig. 9: Exploded view of the front wheel drum and bearings mounting-2WD models

  1. Raise the front of the vehicle and place jackstands under the axle.
  2.  
  3. Remove the wheel.
  4.  
  5. Remove the front hub grease cap.
  6.  
  7. Remove the cotter pin and locknut.
  8.  
  9. Pull out on the brake drum slightly to free the outer bearing and remove the bearing.
  10.  
  11. Remove the drum and hub.
  12.  
  13. Using an awl, puncture the inner seal and pry it out. Discard the seal.
  14.  
  15. Remove the inner bearing.
  16.  
  17. Inspect the bearing races for excessive wear, pitting or grooves. If they are cracked or grooved, or if pitting and excess wear is present, drive them out with a drift or punch.
  18.  
  19. Check the bearing for excess wear, pitting or cracks, or excess looseness.
  20.  

If it is necessary to replace either the bearing or the race, replace both. Never replace just a bearing or a race. These parts wear in a mating pattern. If just one is replaced, premature failure of the new part will result.

  1. If the old parts are retained, thoroughly clean them in a safe solvent and allow them to dry on a clean towel. Never spin dry them with compressed air.
  2.  
  3. On vehicles with drum brakes, cover the spindle with a cloth and thoroughly brush all dirt from the brakes. Never blow the dirt off the brakes, due to the presence of asbestos in the dirt, which is harmful to your health when inhaled.
  4.  
  5. Remove the cloth and thoroughly clean the spindle.
  6.  
  7. Thoroughly clean the inside of the hub.
  8.  
  9. Pack the inside of the hub with EP wheel bearing grease. Add grease to the hub until it is flush with the inside diameter of the bearing cup.
  10.  
  11. Pack the bearing with the same grease. A needle-shaped wheel bearing packer is best for this operation. If one is not available, place a large amount of grease in the palm of your hand and slide the edge of the bearing cage through the grease to pick up as much as possible, then work the grease in as best you can with your fingers.
  12.  
  13. If a new race is being installed, very carefully drive it into position until it bottoms all around, using a brass drift. Be careful to avoid scratching the surface.
  14.  
  15. Place the inner bearing in the race and install a new grease seal.
  16.  
  17. Place the hub assembly onto the spindle and install the outer bearing. Install the wheel bearing nut and tighten it until the hub binds while turning. Back off the nut about 1 / 6 - 1 / 4 turn to free the bearings. Install a new cotter pin.
  18.  
  19. Install the grease cap.
  20.  
  21. Install the wheel.
  22.  
  23. Lower the vehicle and install the hub cap.
  24.  

Locking Hubs

Jeep vehicles through 1970 were not factory equipped with locking hubs. Locking hubs could often be purchased as a dealer installed option, or as aftermarket components.

The following is a general service procedure that should apply to all types. Locking hubs should be lubricated at least once a year and as soon as possible if running for extended periods submerged in water. The same type of grease should be used in the locking hubs as is used on the wheel bearings. EP lithium based chassis lube is preferred.

  1. Remove the lockout screws and washers.
  2.  
  3. Remove the hub ring and knob.
  4.  
  5. Remove the internal snapring from the groove in the hub.
  6.  
  7. Remove the cam body ring and clutch retainer from the hub and disassemble the parts.
  8.  
  9. Remove the axle shaft snapring. It may be necessary to push in on the gear and pull out on the axle with a bolt to make the snapring removal easier.
  10.  
  11. Remove the drive gear and clutch gear. A slight rocking of the hub may make them slide out easier.
  12.  
  13. Remove the coil spring and spring retainer.
  14.  
  15. Clean all the components in a safe solvent. Wipe out the hub with a clean cloth.
  16.  
  17. Grease the inside of the hub liberally.
  18.  
  19. Install the spring retainer ring with the undercut area facing inwards. Be sure it seats against the bearing.
  20.  
  21. Install the coil spring with the large end going in first.
  22.  
  23. Install the axle shaft sleeve and ring and the inner clutch ring with the teeth of both components meshed together in a locked position. It may be necessary to rock the hub to mesh the splines of the axle with those of the axle shaft sleeve and ring. Keep the two gears locked in position.
  24.  
  25. Install the axle shaft snapring. Push in on the gear and pull out on the axle with a bolt to allow the snapring to go into the groove.
  26.  
  27. Install the actuating cam body ring into the outer clutch retaining ring and install them in the hub.
  28.  
  29. Install the internal snapring.
  30.  
  31. Apply a small amount of Lubriplate® grease to the ears of the cam.
  32.  
  33. Assemble the knob in the hub ring and assemble them to the axle with the knob in the locked position. Tighten the screws and washers evenly and alternately, making sure the retainer ring is not cocked in the hub.
  34.  
  35. Torque the screws to 40 inch lbs. (4.5 Nm).
  36.  

 
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