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

TEST VALUES FOR FRICTION TORQUE OF REAR AXLE CENTER ASSEMBLY

Number	Designation		Model 124.003/004/007/ 019/022/023/026/027/ 030/040/042/043/050/ 060/062/079/082/083/ 090 Model 124.104/107 as of 01.05.94 Model 124.127/128/129/ 130/131/133 Model 124.186 as of 01.03.94, except (code 450) taxi version Model 124.188/190/191/ 193/226/230/290/330/ 333/393	Models 124.020/021/080/ 081/120/125/126/180/ 185/186, with (code 450) taxi version as of 01.11.88	Model 129.060
BE35.31-P-1001-02C	Friction torque of drive pinion bearing (new tapered roller bearings)	Ncm	125-150	125-150	125-150

TEST VALUES FOR FRICTION TORQUE OF REAR AXLE CENTER ASSEMBLY

Number	Designation		Models 170.444/445/ 447/449	Model 201.018/023/024/ 122/126, with (code 450) taxi version as of 01.11.88	Models 201.028/ 029/035/ 036/128
BE35.31-P-1001-02C	Friction torque of drive pinion bearing (new tapered roller bearings)	Ncm	125-150	125-150	125-150

TEST VALUES FOR FRICTION TORQUE OF REAR AXLE CENTER ASSEMBLY

Number	Designation		Models 202.018/078/120/ 121/122/125/182 with (code 450) taxi version, Models 202.018/020/022/ 120/121/125 with ASD (code 211)	Model 202.020/022/023/ 024/025/026/028/029/ 080/081/082/083/086/ 087/088/089/128/188 Model 202.085 with automatic 5-speed transmission, model 202.134/194, except (code 450)
BE35.31-P-1001-02C	Friction torque of drive pinion bearing (new tapered roller bearings)	Ncm	125-150	125-150

TEST VALUES FOR FRICTION TORQUE OF REAR AXLE CENTER ASSEMBLY

Number	Designation		MODEL 203.035/045/061 /235/245/261/73 5/745/747, Model 203.004/204 except Code 450	Model 208.335/344/345/ 347/348/435/444 /445/447/448	Model 210.010/ 020/035/037/04 8/061/062/210/ 235/237/248/26 1/262/610
BE35.31-P-1001-02C	Friction torque of drive pinion bearing (new tapered roller bearings)	Ncm	125-150	125-150	125-150

TEST VALUES FOR FRICTION TORQUE OF REAR AXLE CENTER ASSEMBLY

Number	Designation		Model 210.003/004 with (Code 450) 210.007 except code 450
BE35.31-P-1001-02C	Friction torque of drive pinion bearing (new tapered roller bearings)	Ncm	125-150

TEST VALUES FOR FRICTION TORQUE OF REAR AXLE CENTER ASSEMBLY

Number	Designation		Model 124.008/028/029/ 031/032/034/036/051/ 052/061/066/088/091/ 092	Models 129.058/063 up to 31.05.94 Models 129.061/066	Models 140.028/032/ 033 up to 31.05.94 Models 140.042/043/ 063/1
BE35.31-P-1001-02D	Friction torque of drive pinion bearing (new tapered roller bearings)	Ncm	125...150	125...150	125...150

TEST VALUES FOR FRICTION TORQUE OF REAR AXLE CENTER ASSEMBLY

Number	Designation		Model 209.316/375/ 376/475/476	Model 210.070/ 074/270/274 up to 31.01.98, Model 210.072/ 272/617
BE35.31-P-1001-02D	Friction torque of drive pinion bearing (new tapered roller bearings)	Ncm	-	125...150

TEST VALUES FOR FRICTION TORQUE OF REAR AXLE CENTER ASSEMBLY

Number	Designation		Model 209.342/343/ 361/442/461
BE35.31-P-1001-02E	Friction torque of drive pinion bearing (new tapered roller bearings)	Ncm	-

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

Fig 2: Identifying Socket (126 589 02 09 00)

Fig 3: Identifying Torque Measuring Instrument (001 589 49 21 00)

Fig 4: Identifying Connecting Piece (100 589 02 59 00)

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

Shown: 185 mm dia. rear axle center assembly

Fig 5: Pushing Pin Wrench And Socket Wrench Bit Onto Joint Flange
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.

Fig 6: Torque Measuring Instrument With Connecting Piece Mounted Onto Socket

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.

Fig 7: Identifying Twelve-Point Collar Nut, Tapered Roller Bearings And Drive Pinion

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, i.e. the preload of the tapered roller bearings (43, 46) is too low, the twelve point collar nut (40) should 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.