Remove/install piston B08

AR27.50-S-0618EA

Remove/install piston B08

20.07.2020

Transmission

725.0 in model 447, 448

1

Drive shaft

5

Support fixture

2

Planetary gear set 1

6

Piston B08

3

B08 multidisk brake

7

Snap ring

4

Torque converter housing

8

Disk spring

6

Piston B08

9

Pressure device

7

Snap ring

10

Multiplate clutch K81

8

Disk spring

 Caution

Risk of injury to skin and eyes due to handling of transmission oil. Health risk caused by swallowing transmission oil

Wear protective gloves, protective clothing and safety glasses.
Do not pour transmission oil into beverage bottles.

AS00.40-Z-0001-01A

 Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

Topical note

General information on repair work on transmission

AH27.00-S-1000-01PS

 

Remove/install

1

Remove drive shaft (1), planetary gear set 1 (2) with multidisk brake B08 (3).

AR27.50-S-0625EA

2

Remove multiplate clutch K81 (10).

AR27.50-S-0622EA

3

Remove torque converter housing (4) from support fixture (5).

 Support fixture

*725589004000

4

Attach pressure device (9) to piston B08 (6).

 Make sure that the pressure device (9) is at the correct position.

 Pressing tool

*722589013100

 Set of drifts

*722589041500

5

Push down disk spring (8) using pressure device (9) far enough until snap ring (7) is exposed.

 Pressing tool

*722589013100

 Set of drifts

*722589041500

6

Remove snap ring (7).

 Installation: Make sure that the installation position is correct.

7

Remove disk spring (8).

 Installation: Make sure that the installation position is correct.

8

Remove piston B08 (6).

 Installation: Make sure that the installation position is correct.



Measure

9

Measure clearance of multidisk brake B08 (6) and adjust if necessary.

AR27.51-S-7230-02EA

 Commercially available devices/tools
Workshop press
Digital vernier caliper

Clearance in multidisk brake B08

*BE27.51-P-1003-01E

 Pressure cylinder

*725589033100

 Set of drifts

*722589041500

 Pressing tool

*722589013100

 Parallel support

*168589032100

10

Install in the reverse order.

Adjustment values for multidisk clutch/multidisk brake

Number

Designation

Transmission 725.0

BE27.51-P-1003-01E

Clearance in multidisk brake B08

Contact force for clearance adjustment

F1

N

600

Number of internal plates

3

mm

1,6…1,8

4

mm

1,8…2,0