Adjusting friction torque of drive pinion bearing - AR35.31-P-0550-17T

TEST VALUES FOR FRICTION TORQUE OF REAR AXLE DIFFERENTIAL

Number	Designation		Model 171.456	Model 211.006/054/056/065/082/087/092/206/254/256/265/282/287/292/606, Model 211.004 with code 450
BE35.31-P-1001-02G	Friction torque of drive pinion bearing (new tapered roller bearings)	Ncm	215...245	215...245

TEST VALUES FOR FRICTION TORQUE OF REAR AXLE DIFFERENTIAL

Number	Designation		Model 219.356	Model 230.467
BE35.31-P-1001-02G	Friction torque of drive pinion bearing (new tapered roller bearings)	Ncm	215...245	215...245

Fig 1: Identifying Pin Wrench (129 589 01 07 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Identifying Torque Meter (001 589 49 21 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 3: Identifying Connecting Piece (100 589 02 59 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Push pin wrench (040) and socket wrench bit (040a) onto joint flange (41) and carefully tighten hexagon collar nut until the specified friction torque is reached.
When tightening the hexagon collar nut, rotate the drive pinion several times and by applying some light blows to the rear axle housing, ensure that the tapered rollers are correctly positioned in the bearing track.

Fig 4: Tightening Hexagon Collar Nut
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
To check, push torque measuring instrument (040b) with connection piece (040c) onto socket wrench bit (040a) and spin drive pinion at approx. 60 RPM. Read off friction torque.

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

Fig 5: Pushing Torque Measuring Instrument With Connection Piece Onto Socket Wrench Bit And Spin Drive Pinion

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

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

Fig 6: Identifying Collared Hexagon Nut, Joint Flange, Radial Sealing Ring, Tapered Roller Bearing Spacer Sleeve And Shim

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

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 hexagon collar nut (40) is tightened.

If the friction torque is too low when the drive pinion (47) is cranked, i.e. the preload of the tapered roller bearings (43, 46) is too low, the hexagon collar nut (40) should be tightened. 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.