Servicing Rotor, Hub or Bearings
Fig. 1 Using puller to remove hub & rotor. 44 FBJ Units w/disc brakes. Models w/full time 4WD:
Fig. 2 Removing outer bearing cone. 44 FBJ Units w/disc brakes. Models w/full time 4WD:
Fig. 3 Removing bearing retainer. 44 FBJ Units w/disc brakes. Models w/full time 4WD:
Fig. 4 Using pry bar to remove bearing from knuckle. 44 FBJ Units w/disc brakes. Models w/full time 4WD:
MODELS W/FULL TIME 4WD
Removal & Inspection
1. Remove axle shaft cotter pin and loosen outer axle shaft nut.
2. Raise vehicle then remove wheel assembly.
3. After removing caliper retainer and anti-rattle spring assembly, slide caliper out and away from rotor. Hang caliper out of the way. Do not allow caliper to hang by hydraulic brake hose. Remove inboard brake pad.
4. Remove outer axle shaft nut and washer. Secure a suitable puller to wheel studs and tighten main screw of tool to remove hub and rotor assembly.
5. Remove puller from hub and rotor assembly.
6. Assemble Modified Bearing Press, Tool C-293-PA, Extension, Tool C-293-3, and Adapters, Tool No. C-293-49, to hub and rotor assembly and position in a vise. Pull outer bearing cone from hub and rotor and discard outer seal.
7. Remove the six retainer bolts and retainer, then remove brake caliper adapter from knuckle, if required.
8. Place a pry bar behind inner axle shaft yoke and push bearings out of knuckle.
Fig. 5 Sizing axle shaft seal surface. 44 FBJ Units w/disc brakes. Models w/full time 4WD:
Fig. 6 Installing bearing cups before checking bearing clamp. 44 FBJ Units w/disc brakes. Models w/full time 4WD:
Fig. 7 Installing bearing retainer to check bearing clamp. 44 FBJ Units w/disc brakes. Models w/full time 4WD:
Fig. 8 Checking bearing clamp. 44 FBJ Units w/disc brakes. Models w/full time 4WD:
9. Remove and discard O-ring from knuckle, if equipped, then carefully remove axle shaft assembly. Examine inner seal surface and knuckle bore for wear or damage and replace knuckle if required. If outer axle shaft seal surface is grooved, repair as follows:
a. Measure in from yoke shoulder of axle approximately 3/8 inch. Use a center punch and stake at 1/4 inch intervals around circumference of shaft. This will size shaft and ensure a tight fit of inner seal slinger.
b. Proper bearing clamp should be checked by installing bearing cups and spacer into knuckle bore and bolting bearing retainer to knuckle. If a 0.004 inch feeler gauge can not be inserted between knuckle and retainer at the six places midway between retainer mounting ears, the knuckle must be replaced. The brake dust shield may have to be removed to complete this check. If knuckle is serviceable, remove retainer, bearing cups and spacer and install dust shield if removed.
Fig. 9 Installing seal slinger on outer axle shaft. 44 FBJ Units w/disc brakes. Models w/full time 4WD:
Fig. 10 Installing lip seal on outer axle shaft. 44 FBJ Units w/disc brakes. Models w/full time 4WD:
Fig. 11 Using pry bar to retain axle shaft. 44 FBJ Units w/disc brakes. Models w/full time 4WD:
Assembly & Installation
1. Apply RTV sealer or equivalent to seal surface of axle shaft.
2. Using driver, Tool No. C-4398-1, install seal slinger with lip toward splines onto outer axle shaft.
3. Carefully insert axle shaft into housing so as not to damage differential seal at side gears. After sliding axle shaft completely in, wedge a pry bar through universal joint to retain shaft.
Fig. 12 Using driving & adapter to install seal cup into knuckle. 44 FBJ Units w/disc brakes. Models w/full time 4WD:
Fig. 13 Tools in place after seal cup is installed. 44 FBJ Units w/disc brakes. Models w/full time 4WD:
Fig. 14 Tools positioned to press outer bearing onto hub. 44 FBJ Units w/disc brakes. Models w/full time 4WD:
Fig. 15 Forming a seal on bearing retainer face. 44 FBJ Units w/disc brakes. Models w/full time 4WD:
Fig. 16 Bearing retainer positioned with grease fitting facing forward. 44 FBJ Units w/disc brakes. Models w/full time 4WD:
4. Install seal cup using adapter, Tool C-4398-2, and driver, Tool No. C-4398-1. Use a small amount of wheel bearing grease on adapter face to hold cup in position, then drive up until bottomed in knuckle. Do not remove tool at this time.
5. Using a suitable tool, install new outer seal in retainer plate, then locate retainer plate over hub of rotor.
6. Thoroughly pack wheel bearings with Multi-Purpose grease and press outer bearing onto hub using Tool No. C-4246-A and adapters. Remove tool and place grease coated outer bearing cup over bearing cone followed by spacer, grease coated inner bearing cup and inner bearing cone. Again use Tool No. C-4246-A and adapters to press components into position. Remove tool.
7. Apply a 1/4 inch bead of RTV sealer to retainer face on the chamfer. This replaces O-ring discarded during disassembly.
8. Carefully remove seal installing tool from knuckle bore so that outer axle shaft remains centered. If shaft is moved, be sure that lip seal is still riding inside cup. Correct if necessary.
9. Before assembling hub and rotor to knuckle, position bearing retainer in hub so that grease fitting is facing forward, if equipped. Using a crossing method, torque retainer plate bolts to 30 ft-lbs. Bearing retainers that have a grease fitting must be positioned on knuckle so that fitting is facing directly forward.
10. Install brake adapter and remove pry bar from universal joint.
11. Install axle shaft washer and nut. Torque nut to 100 ft-lbs, and continue to tighten nut until next slot in nut aligns with hole in axle shaft. Install cotter pin.
12. Through the access hole in hub, lubricate fitting in bearing retainer with multipurpose grease until grease flows through new inner seal. Seal may be viewed at the universal joint area. Spin hub several times and lubricate fitting again. Grease must flow from 1/2 of seal diameter.
13. Replace brake caliper assembly and wheel, then lower truck and test operation.
MODELS LESS FULL TIME 4WD
Removal & Inspection
1. Remove locking hub assembly, if equipped.
2. Raise and support vehicle, then remove wheel assembly.
3. Remove caliper retainer and anti-rattle assemblies.
4. Remove caliper from disc and support caliper to prevent damage to brake line.
5. Remove inboard brake shoe.
6. On 1985-87 models, remove grease cap and driving hub snap ring, then the driving hub and retaining spring.
7. On all models, remove wheel bearing adjusting locknut using tool C-4170 or equivalent, then the washer and adjusting nut.
8. Remove rotor assembly. The outer wheel bearing and retainer spring plate will slide out as rotor is removed.
9. Pry inner wheel bearing grease seal from hub, then remove bearing cone and the inner and outer bearing cups.
Assembly & Installation
1. Install inner and outer bearing cups in rotor.
2. Lubricate and install inner bearings, then install the grease seal using suitable tools.
3. Install rotor, then the outer wheel bearing.
4. Install inner locknut and torque to 50 ft-lbs, using tool C-4170, to seat bearings.
5. Loosen inner locknut, then retorque to 30-40 ft-lbs, while rotating hub. Back off locknut 135° to 150°. Set retaining washer in position by turning nut so that the pin pressed into locknut will engage nearest hole in washer.
6. Install outer locknut and torque to 50 ft-lbs. End play after final bearing adjustment should be 0.001-0.010 inch.
7. On 1985-87 models, install retaining spring plate, retaining spring with large end first, driving hub, snap ring and grease cap.
8. On all models, install inboard brake shoe on adapter with shoe flanges in adapter slots, then install caliper assembly. Use care not to pull dust boot out of its grooves while sliding piston and boot over the inboard shoe.
9. Install anti-rattle springs and retaining clips and torque to 180 inch lbs. The inboard shoe anti-rattle spring must be installed on top of the retainer spring plate.
10. Install wheel assembly, then lower truck and test operation.