Ford YS4Z-1104-AA Hub Assembly - Wheel

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On 2008 and later models, the manufacturer advises that all suspension and steering system fasteners requiring specific torque should be replaced with new ones whenever removed, excluding subframe bolts. The front hub bearings are non-adjustable and come pre-greased. To check for excessive wear, apply the parking brake, lift the front of the vehicle, and support it on axle stands. Grip the front wheel at the top and bottom, attempting to rock it; excessive movement may indicate worn hub bearings, which can be distinguished from wear in the driveshaft outer joint or front suspension lower arm ball joint. Hub bearing wear manifests as roughness or vibration when the wheel spins and may produce a rumbling or growling noise while driving. Removal of the front hub may damage the bearings, making them unserviceable, so the bearing assembly must always be replaced when the hub is changed. To replace the hub, first remove the steering knuckle and hub assembly, then remove the hub from the bearing inner races, preferably using a press or a suitable metal tube. Any remaining part of the inner race on the hub should be removed with a puller. The wheel bearing must also be replaced, as it may be damaged during removal. Extract the snap-ring securing the hub bearing in the steering knuckle with snap-ring pliers, then press or drive out the bearing using a metal tube slightly smaller than the bearing outer race. Clean the bearing seating faces in the steering knuckle, then press or drive the new bearing into the knuckle until fully located, avoiding pressure on the inner race. Locate the snap-ring into the groove in the knuckle, ensuring it does not cover the wheel speed sensor, then support the inner race on a metal tube and press or drive the hub fully into the bearing before reinstalling the steering knuckle and hub assembly.

Apply a little penetrating oil at the joint between the drum and the axle. A little heat from a propane torch on the inner edge of the drum may also help loosen the bond.