Pinion Installation

- Tools Required
- J 5590 Rear Pinion Bearing Cone Installer
- J 23911 Pinion Oil Seal Installer
- J 8614-01 Pinion Flange Remover





1. Ensure that the bearing cups have been installed. For bearing cup installation, refer to Pinion Depth Adjustment.
2. Install the selective shim between the inner bearing and the shoulder on the gear.
3. Install the inner pinion bearing using the J 5590.
Drive the bearing on until the cone seats on the pinion shim.
4. Install a new collapsible spacer. Lubricate the pinion bearings using axle lubricant.
5. Install the pinion to the axle housing.





6. Install the outer pinion bearing onto the pinion using the J 5590. When you drive the bearing onto the pinion, hold the pinion forward from inside the case.
7. Install the pinion oil seal using the J 23911.
8. Install the pinion flange by tapping the flange using a soft-faced hammer until a few threads are shown.
9. Install the pinion washer and nut while holding the pinion flange using the J 8614-01.
10. Tighten the nut until the pinion end play is just taken up. Rotate the pinion while tightening the nut in order to seat the bearings. When no end play is present in the pinion, check the preload torque.





11. Remove the J 8614-01. Check the pinion preload by rotating the pinion using an inch pound torque wrench. Preload should be at or below 2.7 - 3.6 Nm (24 - 32 inch lbs.) on new bearings, or within 1.0 - 1.4 Nm (8 - 12 inch lbs.) for used bearings.

NOTICE: Refer to Fastener Notice in Service Precautions.

12. If the preload torque is below the specified values, continue torquing the nut in small increments. Check the preload after each tightening. Each tighten increases the bearing preload by several pounds. If the bearing preload is exceeded, remove the pinion, and install a new collapsible spacer.
13. Once the specified preload has been obtained, rotate the pinion several times to ensure the bearings have seated. Recheck the preload, and adjust if necessary,
14. Install the differential case.