Front
REMOVALNOTE: Replacement of the Unit III front hub/bearing assembly can be normally done without having to remove the steering knuckle from the vehicle. In the event that the hub/bearing is frozen in the steering knuckle and cannot be removed by hand it will have to be pressed out of the steering knuckle. The steering knuckle will require removal from the vehicle to allow the hub/bearing assembly to be pressed out of the steering knuckle. Refer to Steering Knuckle for the required removal and installation procedure.
1. Remove the cotter pin, and nut lock from the stub axle.
2. Remove the spring wave washer.
CAUTION: Wheel bearing damage will result if after loosening hub nut, vehicle is rolled on the ground or the weight of the vehicle is allowed to be supported by the tires.
3. With the aid of a helper applying the brakes to keep the front hub from turning, loosen but do not remove the hub nut. The hub and driveshaft are splined together through the knuckle (bearing) and retained by the hub nut.
4. Raise vehicle on jack stands or centered on a frame contact type hoist. See Vehicle Lifting, for the required lifting procedure to be used for this vehicle.
5. Remove wheel lug nuts, and front tire and wheel assembly.
6. Remove front disc brake caliper to steering knuckle attaching bolts.
7. Remove disc brake caliper assembly from steering knuckle. Caliper is removed by first rotating top of caliper away from steering knuckle, and then removing bottom of caliper out from under machined abutment.
8. Support disc brake caliper assembly using a wire hook, do not hang caliper assembly by hydraulic hose.
9. Remove the braking disc from the front hub/ bearing assembly.
10. Remove the retaining nut and the washer from the end of the stub axle.
11. Remove the four hub and bearing assembly mounting bolts from the rear of steering knuckle.
12. Remove the hub and bearing assembly from the steering knuckle.
INSTALLATION
CAUTION: Hub and bearing assembly mounting surfaces on the steering knuckle and halfshaft must be smooth and completely free of foreign material or nicks prior to installing hub and bearing assembly.
CAUTION: When installing hub and bearing assembly into steering knuckle, be careful not to damage the bearing seal on the outer ON joint.
1. Install hub/bearing assembly onto stub axle and into steering knuckle until squarely seated on the face of the steering knuckle.
2. Install the 4 hub/bearing assembly to steering knuckle attaching bolts. Equally tighten all 4 mounting bolts in a cries-cross pattern until hub/ bearing assembly is squarely seated against front of steering knuckle. Then tighten the 4 hub and bearing assembly mounting bolts to a torque of 65 Nm (45 ft. lbs.)
3. Install the hub/bearing assembly to stub shaft washer and retaining nut. Tighten, but do not torque the hub nut at this time.
4. Install the braking disk on the hub and bearing assembly.
5. Install front brake caliper back over braking disc and align with caliper mounting holes on steering knuckle. Caliper is installed by first installing bottom of caliper under machined abutment on bottom of steering knuckle and then rotating top of caliper toward steering knuckle. Install the disc brake caliper to steering knuckle attaching bolts and tighten to a torque of 19 Nm (168 inch lbs.).
6. Install wheel and tire assembly on vehicle. Tighten the wheel mounting stud nuts in proper sequence until all nuts are torqued to half specification. Then repeat the tightening sequence to the full specified torque of 129 Nm (95 ft. lbs.).
7. Lower vehicle to the ground.
CAUTION: When tightening hub/bearing assembly to stub shaft retaining nut, do not exceed the maximum torque of 244 Nm (180 ft. lbs.).
8. With vehicle brakes applied to keep vehicle from moving, torque stub shaft to hub/bearing assembly retaining nut to 244 Nm (180 ft. lbs.).
9. Check the lbs. setting on the vehicle and reset if not within specifications.