R1600G Load Haul Dump Power Train Differential Pinion Preload - Adjust Caterpillar

Illustration 1	g00922820
(1) Pinion shaft (2) Bearing cone (3) Bearing cup (4) Housing (5) Bearing cup (6) Bearing cone (7) Nut (8) Washer

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 in order to prevent rusting.

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

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

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

4. Lubricate washer (8) and nut (7) and install washer (8) and nut (7). Position the assembly vertically in a soft jawed vise. Tighten the vise against the teeth on pinion shaft (1) .

5. Place a 203 mm (8.0 inch) torque wrench on nut (7).

6. Turn housing (4) with the torque wrench. Tighten nut (7) until the torque wrench reading in the following chart is reached.
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   Table 1

   Pinion Rolling Torque (1)
   	Actual Torque At The Pinion	Torque Wrench Reading
   New Bearings	0.9 to 1.8 N·m (6 to 12 lb in)	0.5 to 1.1 N·m (4 to 8 lb in)
   Used Bearings	0.45 to 0.90 N·m (3 to 6 lb in)	0.25 to 0.55 N·m (3 to 4 lb in)

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   ( 1 )

   The measurements are with a 203 mm (8.0 inch) torque wrench.

7. For pinion rolling torque that exceeds the specification, back off nut (7) for one eighth of a turn. Reseat bearing cone (6) and washer (8) against nut (7). Tighten the nut to the correct specification.

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

   Find the torque wrench reading by using the following formula for any other length of a torque wrench.

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   Table 2

   C =	B × T
   	B × A

   (C) The torque wrench reading is measured in Newton meters.

   (B) Measure the length of the torque wrench.

   (A) Measure the bolt circle radius of the pinion housing in meters.

   (T) The rolling torque specification for the pinion bearing preload is 0.9 to 1.8 N·m (6 to 12 lb in).

8. Get the correct torque to turn the pinion.

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Illustration 2	g00104718
(A) Minimum length 4.7 mm (0.185 inch) (B) Minimum depth 2.5 mm (0.098 inch) (C) Position the tool at an angle of 10 degrees to 30 degrees. (D) Spherical diameter of the tool 7.5 to 8.0 mm (0.295 to 0.315 inch)

9. Stake nut (7) by peening the collar on the nut into the key slot in 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 with respect to the nut face. Refer to Illustration 2. 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.

   In order 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.