STUD 9B9106 - Caterpillar

Note: The following procedure controls bearing preload. The procedure provides the same results for new bearings and for used bearings.
Install bearing cone (2) and bearing cone (21) onto the differential group. Make sure that the bearing cone is fully seated. Lubricate the bearing cone with SAE 50W differential oil.
Press bearing cup (6) and bearing cup (8) on pinion housing (28). Make sure that the bearing cups are fully seated.
Press bearing cone (7) on pinion (27). Make sure that the bearing cone is fully seated. Lubricate the bearing cone with SAE 50W differential oil.
Install pinion (27) in housing (28). Press bearing cone (9) onto the pinion shaft. Allow a small amount of end play to remain. Lubricate the bearing cone with SAE 50W differential oil.Note: If you freeze the bearing cups, allow the parts to reach a uniform temperature. Then use a driver or a press to reset the bearing cups. The limit for freezing the bearing cups is −29°C (−20°F). Remove any frost and wipe the bearing cups dry. Lubricate the bearing cups with SAE 50W differential oil to prevent rust on the bearing cups.Note: If you heat the bearing cones, allow the parts to reach a uniform temperature. Then use a driver or a press to reset the bearing cones. The limit for heating the bearing cones is a maximum of 135°C (275°F) for a maximum of four hours. Lubricate the bearing cones with SAE 50W differential oil after the bearing cones have cooled to prevent rust on the bearing cones.
Secure the assembled pinion housing (28) in a holding fixture. Install washer (10) and stake nut (11).
Table 1
Required Tools
Part Number Description Quantity
1U-6691 Socket Wrench Assembly 1
While you rotate pinion shaft (27), tighten nut (11) to achieve a preload rolling torque of 1.2 to 3.4 N m (10.6 to 30 lb in). This is the torque that is needed to rotate pinion (27). Make sure that there is zero end play of pinion shaft (27).Note: Reduce preload rolling torque to 0.6 to 1.7 N m (5.3 to 15 lb in) for used roller bearings with more than 100 hours of operation.
If the preload rolling torque for the pinion exceeds the specifications, back off nut (11) by 1/8 turn and reseat bearing cone (9) and washer (10) against nut (11). Perform Step 6 again.
Illustration 2 g00103469
Stake Nut and Tooling
When the torque for rotating pinion (27) is correct, stake nut (11) by peening the collar into the slot in the pinion shaft. Proper peening requires the use of a punch with a spherical nose. The punch should have a nose that is (C) diameter. The punch should be held at an angle (B). The desired result is a stake of minimum length (D) and minimum depth (E). See Illustration 2 for a view of a completed staked nut.List of dimensions for a staked nutDimension (B) ... 10 to 30°Dimension (C) ... 7.5 to 8.0 mm (.30 to .32 inch)Dimension (D) ... 4.7 mm (.19 inch)Dimension (E) ... 2.5 mm (.10