Remove/install main shaft and countershaft with shift unit

AR26.50-B-0002D

Remove/install main shaft and countershaft with shift unit

06.07.2018

Transmission

710.26 in model 386, 682

Transmission

710.26 in model 688

Transmission

710.270/271/272/273/274 in model 688, 979

1

Reverse intermediate gear

6

Intermediate shaft

2

Gearwheel axle intermediate reverse gear

7

Secondary shaft

3

Gear axle fastening bolt

8

Drive shaft

4

Elastic pin

9

Synchronizer ring

5

Command rod

 

Remove/install

1

Remove the front housing from the gearbox

AR26.40-B-2470I

2

Remove the screw (3) and the reverse gear intermediate gearwheel axle (2)

3

Remove the reverse gear intermediate gearwheel (1)

4

Remove the needle bearing of the reverse gear intermediate gearwheel (1)

 Avoid the needle bearing fall.

5

Remove the drive shaft (8) and the synchronizer ring (9)

 Tilt slightly the main shaft to ease its removal.

6

Remove the clamping pins (4) from the shift rod (5) of 5th gear and reverse gear


Place a wood wedge between the gearwheels and the shift rod
To avoid deformation on shift rod and on its housing.

 Use a 5 mm diameter pin punch.

7

Remove the shift rod (5) of 5th gear and reverse gear with the engagement sector assembled

 Make sure the gearbox is in neutral.

 the 5th and reverse speed fork will be removed later, together with the counter shaft .

8

Remove the clamping pin (4) of the shifting fork of 3rd and 4th gears


Place a wood wedge between the gearwheels and the shift rod
To prevent deformation on shift rod and on its housing.

 Use a 4 mm diameter pin punch.

9

Lift the fork of 1st and 2nd gears and couple the 2nd gear

10

Remove the clamping pin (4) of the engagement sector of 3rd and 4th gears


Place a wood wedge between the gearwheels and the shift rod
To prevent deformation on shift rod and on its housing.

 Use a 4 mm diameter pin punch.

11

Disengage the 2nd gear by moving the fork of 1st and 2nd gears to neutral

12

Remove the shif rod (5), the engagement sector, and the fork of 3rd and 4th gears

13

Remove the clamping pin (4) of the fork of 1st and 2nd gears


Place a wood wedge between the gearwheels and the shift rod
To prevent deformation on shift rod and on its housing.

 Use a 5 mm diameter pin punch.

14

Remove the shift rod (5) and the fork of 1st and 2nd gears

15

Displace the countershaft (6) and remove the main shaft (7) together with the fork of 5th gear and reverse gear


Take care during the removal of the countershaft and main shaft
To prevent shock between the shafts and damages on gearwheels teeth

16

Remove the fork of 5th gear and reverse gear from the main shaft (7)

17

Remove the countershaft (6)

18

Disassemble and assemble the rear housing

AR26.40-B-2476G

19

Install on the reverse order