AR35.31-P-0550-17PA Adjusting Friction Torque of Drive Pinion Bearing

AR35.31-P-0550-17PA Adjusting friction torque of drive pinion bearing
- Rear axle center assembly dia. 185, 198, 210

Friction torque for rear axle center assembly:

Test values for friction torque of rear axle differential:

Special Tools:

Component Identification:

1 Push pin wrench (040) and socket wrench bit (040a) onto joint flange (41) and carefully tighten twelve-point collar nut until the specified friction torque is reached.

When tightening the twelve-point collar nut, rotate the drive pinion several times and apply some light blows to the rear axle housing to ensure that the tapered rollers are correctly positioned in the bearing track.

Component Identification:

2 To check mount torque measuring instrument (040b) with connecting piece (040c) onto socket (040a) and crank drive pinion with approx. 60 rpm, in doing so read off the friction torque.

If the friction torque exceeds the specified torque, remove the drive pinion again and insert a new spacer sleeve.

Component Identification:

Under no circumstances may the friction torque be reduced by loosening the twelve-point collar nut (40) as otherwise the preload of the tapered roller bearings (43, 46) would be too low. This would result in play in the drive pinion (47) while driving and with it rear axle drive noise.

The tapered roller bearings (43, 46) of the drive pinion (47) must be installed with a certain pre-tension. This constant remaining preload is achieved by the spacer sleeve (44) located between the tapered roller bearing inner race and the drive pinion (47) being compressed when the twelve-point collar nut (40) is tightened.

If the friction torque is too low when the drive pinion (47) is spun, the preload of the tapered roller bearings (43, 46) is too low and the twelve-point collar nut (40) must be tightened a little more. If the specified friction torque is fallen below the drive pinion (47) is to be removed again and a new spacer sleeve (44) is to be inserted.