Pinion Depth Adjustment

Pinion Depth Adjustment

^ Tools Required
- J 34925 Pinion Setting Gauge and Components

Important: Make sure all of the tools, the differential side bearing bores, and the pinion bearing cups are clean before proceeding.

1. Lubricate the pinion bearings with axle lubricant.
2. Install the pinion bearings into the axle housing.





3. Assemble the J21777-40 (1), the J 21777-43 (2), the J 21777-42 (3), and the J 23597-11 (4) as shown.

Notice: Refer to Fastener Notice in Service Precautions.

4. While holding the J21777-43 stationary, install an inch-pound torque wrench on the nut of the J 21777-43.
^ Tighten the nut on the J 21777-43 until a rotating torque of 2.3 Nm (20 inch lbs.) is obtained. Rotate the assembly several times in both directions in order to seat the pinion bearings.
5. Check the rotating torque of the assembly. If the rotating torque is less than 1.7 Nm (15 inch lbs.), continue to tighten the nut on the J21777-43 until a rotating torque of 1.7 - 2.8 Nm (15 - 25 inch lbs.) is obtained.
6. Assemble the J 21777-45 (1, 2) to the J 23597-1 (3) and install into the differential carrier bore of the axle housing as shown.
7. Install the bearing caps.





8. Install the bearing cap bolts.
^ Tighten the bearing cap bolts to 75 Nm (55 ft. lbs.).
9. Rotate the J23597-1 within the J21777-45. The J23597-1 must rotate back and forth freely within the discs. If the J23597-1 does not rotate freely, disassemble the components, inspect for proper seating and/or misaligned components and re-assemble.





10. Align the plunger of the J 23597-1 (1) to the J23597-11 (2).
11. Install the J 8001-3 to the J 23597-1 as follows:
11.1. Loosely clamp the J 8001-3 onto the stem on the J 23597- 1.
11.2. Place the contact pad of the J 8001-3 onto the mounting post of the J 23597- 1.
11.3. With the contact pad of the J 8001-3 touching the mounting post of the J 23597-1, loosen the lock nut on the J 8001-3 and push down on the J 8001-3 until the needle the J 8001-3 has turned 3/4 of a turn clockwise.
11.4. Tighten the clamp on the J 8001-3 finger tight.
12. Move the plunger of the J 23597-1 back and forth until the needle of the J 8001-3 indicates the greatest deflection. The deflection is the point where the needle changes direction.





13. At the greatest point of deflection, move the housing of the J 8001-3 until the needle indicates zero.
14. Move the plunger of the J 23597-1 back and forth again to verify the zero setting. Adjust the housing of the J 8001-3 as necessary to set the needle to zero.
15. Rotate the plunger of the J 23597-1 from the J 23597-11 until it no longer touches the J 23597-11.
16. The value indicated on the J 8001-3 is the thickness of the shim needed in order to set the depth of the pinion.
17. Select the shim that indicates the proper thickness. Measure the shim with a micrometer in order to verify that the thickness is correct.
18. Remove the pinion depth setting tools.
19. Remove the pinion bearings.
20. Install the pinion shim between the pinion gear and the inner pinion bearing.