Timken/Rockwell - 12 Inch Ring Gear

Fig. 1 Timken/Rockwell drive axle w/12 inch ring gear exploded view:

DISASSEMBLY

1. Tap or press pinion from cage, taking care not to damage shaft threads, then remove outer pinion bearing, Fig. 1.
2. Remove spacer from pinion, then the inner bearing, using suitable separator and press or puller.
3. If straddle bearing must be replaced, remove snap ring and washer, then the bearing, using suitable puller.
4. If bearings are to be replaced, press outer races from bearing cage, taking care not to distort cage.
5. Inspect components as outlined, and replace as needed, keeping components in order for assembly.




ASSEMBLY & PRELOAD ADJUSTMENT

1. When installing new cups, press them firmly against pinion bearing cage shoulders.
2. Lubricate bearings and cups with suitable lubricant.
3. Press rear thrust and radial bearings firmly against pinion shoulders, using suitable sleeve that will bear only on bearing inner race.
4. Install radial bearing lock ring, then squeeze ring into pinion shaft groove.
5. Insert pinion and bearing assembly in pinion cage and position spacer or spacer combination over pinion shaft.
6. Press front bearing firmly against spacer.
7. Rotate cage several revolutions to assure normal bearing contact.
8. Press flange or yoke against forward bearing and install washer and pinion shaft nut.
9. Place pinion and cage assembly over carrier studs, hold flange with suitable tool, and torque pinion shaft nut to 350 ft. lbs.
10. Check pinion bearing preload torque. If rotating torque is not within 5 to 15 pound inches, disassemble, adjust spacer, reassemble, and recheck preload torque. Use thinner spacer to increase or thicker spacer to decrease preload.
11. Hold flange with suitable tool and remove pinion shaft nut and flange.
12. Lubricate pinion shaft oil seal and cover outer edge of seal body with non-hardening sealing compound, then press seal against cover shoulder with suitable tool.
13. Install new gasket and bearing cover.
14. Press flange against forward bearing and install washer and pinion shaft nut, torquing nut to 350 ft. lbs.