See Figures 1, 2, 3 and 4
- Raise and support the front end on jackstands. Check both the bearing axial play and the ease and smoothness of rotation. Axial play should be 0; the wheel should rotate smoothly, with no perceptible bearing noise.
- Remove the wheel. Remove the brake drum or disc brake caliper. Suspend the caliper out of the way. Don't disconnect the brake line.
- Attach a spring scale to a wheel lug.
- Pull the scale horizontally and check the force needed to start the wheel turning. The force should be 1.3-2.4 lbs. If the reading is not correct, proceed.
- Remove the grease cap and cotter pin.
- Tighten or loosen the hub nut until the correct pull rating is obtained.
- Align the cotter pin holes and insert a new cotter pin. Replace the grease cap and wheel.
REMOVAL, REPACKING AND INSTALLATION
See Figures 5 through 23
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:
Do NOT do the following:
- Raise and support the front end on jackstands.
- Remove the wheel.
- Remove the grease cap, cotter pin, hub nut and flat washer.
- On trucks with disc brakes, remove the caliper and suspend it out of the way without disconnecting the brake line. Slowly pull the hub from the spindle, positioning your hand to catch the outer bearing.
- Remove the spacer, inner seal and inner bearing. Discard the seal.
- Thoroughly clean the bearings and inside of the hub with a nonflammable solvent. Allow them to air dry.
- Inspect the bearings for wear, damage, heat discoloration or other signs of fatigue. If they are at all suspect, replace them. When replacing bearings, it is a good idea to replace the bearing races as a set, as bearings do wear the races in a definite pattern which may not be compatible with new bearings.
- To replace the races, carefully drive them out of the hub with a drift.
- Coat the outside of the new races with clean wheel bearing grease and drive them into place until they bottom in their bore. Make certain that they are completely bottomed! A drift can be used as a driver, if you hammer evenly around the rim of the race and are very careful not to slip and scratch the surface of the race. A driver made for the purpose is much easier to use.
- Pack the inside of the hub with clean wheel bearing grease until it is flush packed.
- Pack each bearing with clean grease, making sure that it is thoroughly packed. Special devices are sold for packing bearings. They are inexpensive and readily available. If you don't have one, just make certain that the bearing is as full of grease as possible by working it in with your fingers.
- Install the inner bearing and seal. Drive the seal into place carefully until it is seated.
- Install the spacer and the hub on the spindle.
- Install the outer bearing, flat washer and hub nut.
- Adjust the bearing as explained above.
- Install the nut cap, cotter pin and grease cap. Install the wheel.