Front wheel drive vehicles are equipped with permanently sealed front wheel bearings. There is no periodic lubrication or maintenance recommended for these units. However, if during servicing the brake system, service to the front wheel bearing is required, refer to Drive Train in this information.
The lubricant in the rear wheel bearings should be inspected whenever the hubs are removed to inspect or service the brake system, or at least every 30,000 miles (48,000 km). The bearings should be cleaned and repacked with a High Temperature Multipurpose E.P. Grease whenever the disc rotors are resurfaced.
Check the lubricant to see that it is adequate in quantity and quality. If the grease is low in quantity, contains dirt, appears dry or has been contaminated with water, it will appear milky. The bearings must then be cleaned and repacked.
Do not add grease to a wheel bearing that already has grease packed in it. Relubricate completely. Mixing of different types of greases in wheel bearings should be avoided since it may result in excessive thinning and leakage of the grease.Premier
- Raise and support the rear of the vehicle on jackstands.
- Remove the wheel(s) from the rear axle.
- Remove the plastic cap from the center of the brake drum.
- Install a dial indicator on the brake drum with the stem resting against the end of the axle shaft.
- Push the brake drum inward and note the reading of the dial indicator. Replace the hub and bearing assembly if the movement exceeds 0.001 in. (0.03mm). The bearings and bearing races are permanently installed in the hub assembly, therefore the entire hub assembly should be replaced with a new one.
- If the movement does not exceed the standard, the rear hub bearings are still good.
- Remove the dial indicator from the brake drum.
- Install the plastic cup back onto the center of the brake drum.
- Install the wheel(s) and torque the lug nuts to 63 ft. lbs. (85 Nm) for the steel wheels and to 90 ft. lbs. (122 Nm) for aluminum wheels.
- Lower the vehicle back to the ground.
REMOVAL, PACKING AND INSTALLATION
See Figure 1
For the servicing, removal and installation of the rear wheel bearings utilize to the following procedure:
- Remove the rear tire and wheel assembly.
- On the rear disc brake equipped vehicles, remove the caliper and rotor. Support the caliper out of the way with strong cord or wire. Do not allow the caliper to hang by the hydraulic hose. For further procedures, refer to Brakes .
- Remove the grease cap, cotter pin, locknut, nut thrust washer and outer wheel bearing.
- Carefully slide the hub or drum off of the spindle. Do not drag the inner bearing or grease seal over the stub axle (thread, bearing, and oil seal may be damaged.) Remove the grease seal and inner bearing from the drum or hub. Discard the old grease seal, a new seal should be used when reinstalling the inner bearing.
- Thoroughly clean all old grease from the outer and inner bearings, bearing cups and hub cavity. To clean the bearings, soak them in an appropriate cleaning solvent. Strike the flat surface of the bearing inner race against a hardwood block several times. Immerse the bearings in solvent between the blows to jar the grease loose and wash old particles of hardened grease from the bearings. Repeat this operation until the bearings are clean. Bearings can be dried using compressed air, but do not spin the bearings. After cleaning, oil the bearings with engine oil. Insert the bearing into its appropriate cup, apply pressure to the bearing while rotating it to test them for pitting and roughness. Replace all worn or defective bearings with new ones. Bearings must be replaced as a set, both the cup and the bearing need to be replaced at the same time. If the bearings are suitable for further use, remove the engine oil from the bearings using the appropriate solvent, then dry the bearings. Repack the bearings using a Multi-Purpose NLGI Grade 2 EP Grease such as Mopar or equivalent. Make sure to work as much grease as possible into the bearings. Place the bearings in a clean covered container until ready for installation. If a bearing packer is not available, hand pack the grease into all cavities between the bearing cage and rollers.
- If the bearings and cups are to be replaced, remove the cups from the drum or hub using a brass drift or suitable remover.
- Install the new bearing cups with a bearing cup installation tool.
- Install the inner bearing in the grease coated hub and bearing cup, and install new grease seals using the appropriate seal installer.
- Coat the hub cavity and cup with grease.
- Before installing the hub or drum assembly, inspect the stub axle and seal surface for burrs or roughness, and smooth out all rough surfaces.
- Coat the stub axle with Multi-Purpose NLGI Grade 2 EP grease such as Mopar or equivalent.
- Carefully slide the hub of the drum assembly onto the stub axle. Do not drag the seal or inner bearing over the threaded area of the stub axle.
- Install the outer bearing, thrust washer and nut.
- Tighten the wheel bearing adjusting nut to 20-25 ft. lbs. (27-34 Nm) while rotating hub or the drum assembly. This seats the bearings.
- Back off the adjusting nut 1 / 4 turn (90°), then finger-tighten it.
- Position the locknut over the bearing adjusting nut with one pair of slots in line with the cotter pin hole in the stub axle, and install the cotter pin.
- Install the grease caps and the wheel and tire assemblies. Tighten the wheel stud nuts to 85 ft. lbs. (115 Nm) on all models. Reinstall the wheel covers, if so equipped.
See Figures 2 and 3
- Raise and support the rear of the vehicle. Block the front wheels to keep the vehicle from rolling.
- Remove the rear wheel(s).
- Remove the hub cap, but do not remove the drum retaining nuts.
- Remove the hub nut.
- If the drum proves difficult to remove, brake shoes are probably holding the drum in place and must be backed off. Remove the access plug from the backing plate. Unseat the adjuster lever with a small prytool and back off the adjuster screw with the brake tool.
- Pull the hub and drum off of the axle shaft.
- Separate the brake drum from the wheel hub by removing the drum retaining nuts.
- Either hammer the lug studs out of the old axle hub before disposal of the hub, or purchase new lug studs to install in the new axle hub.
- Install the new axle hub (with axle studs installed) to the brake drum and install the drum retaining nuts.
- Lubricate the axle shaft and hub bearings with bearing grease.
- Install the drum and hub assembly onto the axle shaft.
- Secure the hub and drum to the axle shaft with a new hub nut. Tighten the nut to 123 ft. lbs. (167 Nm).
Adjust the rear brakes with the following procedure:
- Working through the access plug hole, tighten the adjuster screw with the brake tool or thin prytool until the drum exhibits a moderate drag condition.
- While holding the adjuster lever away from the adjuster screw with the thin-bladed prytool. Back off the adjuster screw one full turn.
- Install the access plug into the backing plate.
- Install the cap in the hub.
- Install the wheels and tighten the lug nuts to 63 ft. lbs. (85 Nm) for the steel wheels and to 90 ft. lbs. (122 Nm) for aluminum wheels.
- Lower the vehicle back to the ground and remove the wheel chocks.