Disassemble and assemble main shaft

AR26.50-B-0420H

Disassemble and assemble main shaft

12.02.16



Disassemble

1

Remove the gearbox front housing

For Transmission 712.360/361/362

AR26.40-B-2470B

2

Remove transmission rear housing

For Transmission 712.360/361/362

AR26.40-B-2475A

For Transmission 712.370/371

AR26.40-B-2475C

3

Withdraw drive shaft from shaft assembly, and fasten main shaft (23) at the flange end in a bench vise

Use protections on vise jaws.

4

Remove synchronizer ring (3) and tapered roller bearing (1)

For bearing removal use a multipurpose extractor with two claws together with special tool.



*710589046300

5

Remove shifting collar (9) and locking ring (2). Then extract synchronizer body (4)

Cover shifting collar with cloth to keep positioners and balls (6 and 7) from being ejected by pressure spring (5) action.

For synchronizer body removal use a multipurpose extractor with two claws together with special tool.



*710589036300

6

Remove synchronizer ring (8), 3rd speed gear (10), and needle roller bearing (11)

7

Withdraw 2nd speed gear (14) together with bushing (12) and washer (13)

For this operation use a multipurpose extractor with two claws together with special tool.



*710589036300

8

Remove locking ring (16) and synchronizer ring (17). Turn main shaft (23) around and fasten it at the power input end (drive)

Use protections on vise jaws.

9

Remove tapered roller bearing (32)



*001589413300



*710589046300

10

Remove 5th speed gear (31), split needle roller bearing (30), and synchronizer ring (27)

11

Remove locking ring (29) and shifting collar (28)

Cover shifting collar with cloth to keep positioners and balls (6 and 7) from being ejected by pressure spring (5) action.

12

Remove synchronizer body (26), reverse gear (25), and needle roller bearing (24)

For synchronizer body removal use a multipurpose extractor with two claws together with special tool.



*710589036300

13

Turn main shaft around again and fasten it at the flange end

Use protections on vise jaws.

14

Withdraw 1st speed gear (21)

For this operation use a multipurpose extractor with two claws. Together with 1st speed gear the following components are to be removed in one operation: synchronizer body, synchronizer ring, and shifting collar (18, 19, 20).



Assembly

15

Check wear limit between synchronizer rings and coupling bodies

AR26.50-B-0420-13A

Wear limit between synchronizer rings and shifting collars.

*BE26.50-B-1012-01B

16

Mount needle roller bearing (24) and reverse gear (25)

Lubricate needle roller bearing lightly and mount gear (25) with its cone facing the power output side.

Danger!

Risk of injury by burning

Use adequate protection equipment when handling heated components.

17

Mount synchronizer body (26) and locking ring (29)

Heat synchronizer body to approx. 120 °C. The surface with a welded ring must be positioned towards the main shaft drive side.

Locking ring must be mounted without any clearance, if possible. if needed, it must be replaced by a thicker ring.

Radial play for locking rings.

*BE26.50-B-1013-01B

18.1

Mount shifting collar (28) together with pressure springs (5), positioners (6), and balls (7).

The shifting collar has recessed teeth, at 120° intervals, where the balls are to be fitted. Assure correct mounting position of shifting collar.

18.2

Install synchronizer ring (27)

Make sure the synchronization teeth mesh.

19

Install split needle roller bearing (30), 5th speed gear (31), and tapered roller bearing (32)

Lightly lubricate split needle roller bearing. Before installation heat tapered roller bearing to a temperature of approx. 120 °C.

20

Fasten main shaft (23) in a bench vise at the flange end. Mount needle roller bearing (22) and 1st speed gear (21)

Use protections on vise jaws when fastening the main shaft.

Lubricate needle roller bearing lightly and mount 1st speed gear with its cone facing the power input side.

21

Mount synchronizer ring (19), synchronizer body (18), and then locking ring (16)

Heat synchronizer body to approx. 120 °C and mount it with the inscription side facing the power input side.

Make sure the synchronization teeth mesh.

Locking ring must be mounted without any clearance, if possible. if needed, it must be replaced by a thicker ring.

Radial play for locking rings.

*BE26.50-B-1013-01B

22.1

Mount shifting collar (20) together with pressure springs (5), positioners (6), and balls (7)

The shifting collar has recessed teeth, at 120° intervals, where the balls are to be fitted. Assure correct mounting position of shifting collar.

22.2

Install synchronizer ring (17)

Make sure the synchronization teeth mesh.

23

Install needle roller bearing (15) 2nd speed gear (14), washer (13), and bushing (12)

Lightly lubricate needle roller bearing.

Heat washer and bushing to approx 120 °C before installation.

24

Install needle roller bearing (11), 3rd speed gear (10), synchronizer ring (8), and synchronizer body (4)

Lubricate needle roller bearing lightly and mount 3rd speed gear with its cone facing the power input side.

Heat synchronizer body to approx. 120 °C and mount it with the inscription side facing the power input side.

25

Install the locking ring (2)

Locking ring must be mounted without any clearance, if possible. If needed, it must be replaced by a thicker ring.

26

Mount shifting collar (9) together with pressure springs (5), positioners (6), and balls (7)

The shifting collar has recessed teeth, at 120° intervals, where the balls are to be fitted. Assure correct mounting position of shifting collar.

27

Install tapered roller bearing (1) and synchronizing ring (3)

Before installation heat tapered roller bearing to a temperature of approx. 120 °C.

Make sure the synchronization teeth mesh.

Número

Denominação

Gearbox 712.36

Gearbox 712.370; 712.371

BE26.50-B-1012-01B

Wear limit of synchronizing rings

mm

0,6

0,6

BE26.50-B-1013-01B

Axial clearance of locking-rings

mm

0...0,10

0...0,10