IT28G Integrated Toolcarrier and 928G Wheel Loader Differential Pinion Preload Adjustment Caterpillar

Pinion Preload Adjustment for the Rear Axle

Illustration 1	g00995619
Rear pinion

Note: Freezing of the cup or heating of the cone may be used. Reset the cups or cones with a driver or press after parts have reached a uniform temperature. Heat the cone to a limit of 135°C (275°F) maximum for 4 hours maximum. To prevent rusting, lubricate the bearings after the bearings have cooled. Freeze the cup to a limit of −29° C (−20° F). Wipe the cup dry. Remove any frost. Allow the cone to cool. Lubricate the cone to prevent rusting.

1. Install bearing cups (3) and (5) in the housing (4). Bearing cups must be seated against the shoulders in the housing (4).

2. Install the bearing cone (2) on pinion (1). Bearing cone (2) must be seated against the shoulder on the pinion (1). Lubricate the bearing cone (2).

3. Secure the housing (4) in a holding device. Install the pinion (1) in the housing (4). Press the cone (6) of the bearing into place. Leave a small amount of end play. Lubricate the bearing cone (6).

4. Lubricate the washer (8) and the nut (7) and install the washer (8) and the nut (7).

5. Place a torque wrench on nut (7) with the 1U-6690 Socket Wrench As.

6. Turn the pinion shaft (1) with the torque wrench. Tighten the nut (7) until the torque wrench reading in the following chart is reached.
   Show/hide table

   Table 2

   Pinion Rolling Torque
   Bearings	Actual Torque At The Pinion
   New Bearings	0.7 to 1.4 N·m (6 to 12 lb in)
   Used Bearings	0.35 to 0.70 N·m (3 to 6 lb in)

7. Stake the nut (7) by peening the collar on the nut into the key slot in the pinion shaft (1). Use a suitable punch with a spherical nose that has a diameter of 7.5 to 8.0 mm (0.295 to 0.315 inch).

   Best results are achieved by holding the punch against the nut face at 10 degrees to 30 degrees to the nut face. Refer to the above illustration. The desired results are a stake that is 4.7 mm (0.185 inch) minimum length and 2.5 mm (0.098 inch) minimum depth.

   To disassemble the nut during servicing, drive a wedge under the stake. Lift the stake. The nut may be reused if the collar is not cracked during removal or restaking.

   Note: The nut may be reused if the collar is not cracked during the removal or the restaking.

Pinion Preload Adjustment for the Front Axle

Illustration 2	g00994743
Front differential and pinion

Note: The following is the procedure for the preload adjustment for the front axle. The fixed yoke is attached. The preload is set by using shims between the yoke retainer and the pinion shaft.

Note: Freezing of the cup or heating of the cone may be used. Reset the cups or cones with a driver or press after parts have reached a uniform temperature. Heat the cone to a limit of 135°C (275°F) maximum for 4 hours maximum. To prevent rusting, lubricate the bearings after the bearings have cooled. Freeze the cup to a limit of −29° C (−20° F). Wipe the cup dry. Remove any frost. Allow the cone to cool. Lubricate the cone to prevent rusting.

1. Install bearing cups (3) and (5) in the housing (4). Bearing cups must be seated against the shoulders in the housing (4).

2. Install the bearing cone (2) on pinion (1). Bearing cone (2) must be seated against the shoulder on the pinion (1). Lubricate the bearing cone (2).

3. Install the pinion (1) in the housing (4). Press the cone (6) of the bearing into place. Leave a small amount of end play. Lubricate the bearing cone (6).

4. Secure the pinion in a holding fixture. Install the spacer (10), yoke assembly (11), seal (12), shim pack (13), retainer (14), and bolt (15). Tighten the bolt to 105 ± 20 N·m (77 ± 15 lb ft).

5. Secure the pinion housing (9) in a holding fixture. Place a torque wrench on bolt (15). Turn the pinion and measure the rolling torque. See table 3 for the correct torque. Add an extra 0.6 N·m (5 lb in) for the seal drag.
   Show/hide table

   Table 3

   Pinion Rolling Torque
   Bearings	Actual Torque At The Pinion
   New Bearings	0.7 to 1.4 N·m (6 to 12 lb in)
   Used Bearings	0.35 to 0.70 N·m (3 to 6 lb in)

6. For pinion rolling torque that exceeds the specification, remove bolt (15) and retainer (14). Add shims as necessary and repeat the setting procedure.

   For pinion rolling torque that is lower than the specification, remove bolt (15) and retainer (14). Remove shims as necessary and repeat the setting procedure.

   Ensure that there is zero end play of the pinion shaft (1).