Remove/install drive pinion

AR35.30-B-0458A

04.08.2020

Rear axle	743.4 (except 743.498) in model 688.1/2
Rear axle	746.891/982 in model 693, 694
	plain-flanged

Modification notes

21.08.2019	Threaded rings of drive pinion bearings	BA35.30-B-1002-06C
21.08.2019	Drive pinion (basic depth and thickness or compensation washers)	BE35.31-B-1005-03C
30.10.2019	Drive pinion (basic depth and thickness or compensation washers)	BE35.31-B-1005-03C

1	Coupling flange
2	Threaded ring
3	Tapered roller bearing (outer)
4	Split ring
5	Lock
6	Shim
7	Roller bearing
8	Retaining ring

B35.31-0051-01

B35.31-0050-01

	Remove
1	Remove the differential with crown gear	Rear axle 743.410/411/413/414/415/432/433/436/437/438 Rear axle 746.891	AR35.30-B-0464B
		Rear axle 743.439/498	AR35.30-B-0464E
2	Remove the screw and lock (5) from the threaded ring of drive pinion (2)
3	Remove the threaded ring (2) from its housing	 Torque multiplier	*000589021300
		 Claw-type wrench	*384589000700
		 Slotted nut wrench	*318589010700
		To not deform the deflector of the flange:
		
		Rotate the threaded ring (2) a few turns and move the drive pinion away by striking it into the inner side using a mandrel made of a pliable material.
		 Repeat this until the last thread of the threaded ring (2) is visible.
4	Remove the drive pinion assembly	 Do not remove the drive pinion assembly without installing two screws in the coupling flange (1) to secure the threaded ring (2) against the outer bearing cap (3): This feature will prevent the split ring (4) from falling into the oil groove in the housing.
		 Hit the drive pinion end from the inside of the housing with a mandrel of soft material.
5	Remove the compensation washer from housing (6)
6	Remove the lock-ring (8) and the outer race of the cylindrical roller bearings (7)	 Utilize an appropriate tool.
7	Remove the outer race of the cylindrical rollers bearing (7)	 Drift	*345589051500
		 Drift punch	*730589041500
8	Disassemble the drive pinion assembly	Rear axles 746.891/980/982	AR35.30-B-0459A
		Rear axle 743.439/498	AR35.30-B-0459D
	Install
9	Assemble the drive pinion assembly	Rear axles 746.891/980/982	AR35.30-B-0459A
		Rear axle 743.439/498	AR35.30-B-0459D
10	Install the external race of cylindrical roller bearings (7)	 Install from the inside of the housing.
		 Note the groove parallelism on the external race of cylindrical roller bearings and its housing.
		 Drift	*345589051500
		 Drift punch	*730589041500
11	Install the lock ring (8) on the outer race of the cylindrical bearing (7)	 Install in the same direction of rotation of the drive pinion.
12	Install some shims (6) on the drive pinion housing inside the housing
13	Position the drive pinion assembly in its housing	 Install two screws in the coupling flange (1) to secure the threaded ring (2) against the outer bearing cap (3): This feature will prevent the split ring (4) from falling into the oil groove in the housing.
		 Insert the plastic bush used for removal into the outer race of the tapered roller bearing (7): To avoid damage to the bearing.
		 Hit the drive pinion assembly with a plastic hammer until the threaded ring (2) touches the face of the housing.
14	Install the threaded ring (2) to housing	 Remove the two screws which have been used in the installation.
		 Apply a sealing agent on the screwed surface of the ring.
		 Threaded rings of pinion bearings	*BA35.30-B-1002-06C
		Terolan 307/II, Dichtin 51, epple 22 sealant	*BR00.45-Z-1018-01A
		 Torque multiplier	*000589021300
		 Claw-type wrench	*384589000700
		 Slotted nut wrench	*318589010700
	Check
15	Check the basic measurement of the drive pinion depth	Rear axle 746.891/982	AR35.30-B-0458-01A
		Rear axle 743.4 in Type 688.1/2	AR35.30-B-0458-01D
		.Pinion (basic depth and thickness or compensation washers)	*BE35.31-B-1005-03C
		 Adjustment tool	*055589342100
		 Adjusting device	*321589042100
		 Adjusting element	*318589012102
		 Dial gage	*001589532100
16	Retighten the threaded ring (2)
		 Apply a sealing agent on the screwed surface of the ring.
		 Threaded rings of pinion bearings	*BA35.30-B-1002-06C
		Terolan 307/II, Dichtin 51, epple 22 sealant	*BR00.45-Z-1018-01A
		 Torque multiplier	*000589021300
		 Claw-type wrench	*384589000700
		 Slotted nut wrench	*318589010700
17	Lock the threaded ring with lock (5)
18	Install the differential with the crown gear	Rear axle 743.4, 746.891/982	AR35.30-B-0464B
		Rear axle 743.439/498	AR35.30-B-0464E

Differential. ring ear and pinion check values

Number	Designation			746.890, 746.891 Rear axles	746.980/982/983 Rear axle
BE35.31-B-1005-03C	Pinion (basic depth and thickness or compensation washers)	Basic depth	mm	83,50	83,50
		Thickness of the compensating washers	mm	0,10, 0,15, 0,20, 0,50, 1,50	0,10, 0,15, 0,20, 0,25, 0,50, 1,50