Disassemble/assemble drive pinion

AR35.30-B-0459E

12.02.16

Rear axle 746 with Vehicle 382.180, 382.181, 382.171, 382.175, 382.176, 382.177, 382.184, 382.185, 382.186, 382.188, 382.189, 634.001

Rear axle 746.973 with Vehicle 634.011, 634.061, 634.071

Rear axle 746.974 with Vehicle 634.011, 634.061, 634.071, 634.081

B35.31-0056-06

1 Collar nut

2 Coupling flange

3 Seal

4 Threaded ring

5 Thrust ring

6 Taper roller bearing

7 Split washer

8 Spacer washer

9 Taper roller bearing

10 Pinion

11 Inner race - Cylindrical roller bearings

12 Lock ring

13  Immobilization key

	Disassembling
1	Remove the pinion assembly from the rear axle	Rear axle 746.983 with coupling flange	AR35.30-B-0458D
		Rear axle 746.97/98/99 with yoke flange	AR35.30-B-0458G
2	Secure the pinion assembly in a vise and remove the nut with collar (1)		*717589003100
3	Remove the coupling flange (2) or the coupling fork		*035589013300
4	Remove the threaded ring (4) and the thrust ring (5)
5	Extract the seals (3) from the threaded ring (4)		*310589001500
6	Remove under pressure the tapered roller bearings (6) (9), the split washer (7) and the spacer ring (8)	 With 40:7 43:7 48:7 reduction shafts	*321589043500
		 With 39:8 reduction shafts	*344589003400
7	Remove the lock-ring (12) and the inner race of the cylindrical roller bearings (11)		*000589453300
	Check
8	Check the components for damage and wear.	 Replace the defective parts. Thoroughly lubricate the sliding surfaces of all parts with gear oil Each crown/pinion set includes an electrically engraved number on the front face of the pinion and the oblique face of the crown. Assemble only sets with the same number.
	Installing
9	Install the inner race of the inner tapered roller bearing (9) with an appropriate sleeve	 Heat the inner race to 80 °C. Observe the bearing widths: inner roller bearing = larger width; outer roller bearing = smaller width
			*370589011500
10	Install the spacer washer (8) and both outer races of the tapered roller bearings (6) (9)
11	Install the inner race of the outer tapered roller bearing (6) using an appropriate sleeve	 Heat the inner race to 80 °C
12	Install the thrust ring (5).
13	Fit new seals (3) under pressure into the threaded ring (4)	 Inner seal with single sealing lip, outer seal with ancillary sealing lip
		 Apply a sealing agent to the external surface of the seals	*BR00.45-B-1001-01A
			*745589041500
14	Install the threaded ring (4) with seals on the pinion	 Fill with the inner space between the seal lips with grease.	*BR00.45-B-1003-06A
15	Install the coupling flange (2) or coupling fork on the pinion streaks until it touches the thrust ring (5), and screw the collar nut (1)
16	Secure the flange (2) or coupling fork of the coupling wrench on a vise and tighten the collar nut (1) on the pinion set		*BA35.30-B-1001-06C
			*717589003100
17	Install the inner race of the cylindrical roller bearing (11) at the tip of the pinion and lock it with the lock ring (12)	 Heat the inner race to 80 °C
18	Install the split washer (7) and check frictional torque of the bearings		AR35.30-B-0470-04C
		Frictional torque of the pinion bearings	*BE35.31-B-1001-02C
		Thickness of the split rings	*BE35.31-B-1002-02C
			*001589492100
			*354589012100
19	Lock the collar nut (1) by punching its collar on the pinion slot
20	Install the pinion on the rear axle	Rear axle 746.983 with coupling flange	AR35.30-B-0458D
		Rear axle 746.97/98/99 with yoke flange	AR35.30-B-0458G

Test values for rear axle center assembly friction torque

Número	Denominação			Axles 743.0/1/2, 743.3, 746.890/891/980, 746.982/983	Axles 741.914/918, 741.93, 741.95, 742.8, 745.5, 745.9, 746.5, 746.8, 746.97; 746.990/991/994, 746.995/997


BE35.31-B-1001-02C	Friction moment of the pinion bearings		Nm	1.4 ... 4.2	1.4 ... 6.0
BE35.31-B-1002-02C	Thickness of bipartite washers of the pinion bearings - 0.02 mm increments	minimum	mm	6.66	6.60
		Maximum	mm	7.08	7.40

Drive pinion

Número	Denominação			Rear axle 745.53/95/98, 746.86/87/880, 746.97, 746.990/991/994, 746.995/997	Rear axle 743.0, 743.2, 743.3, 746.980, 746.982, 746.983


BA35.30-B-1001-06C	Mounting nut of pinion coupling flange	M32	Nm	-	-
		M40 Hex	Nm	360	360
		M40 Dodecagonal	Nm	580...600	480...500