Disassemble/assemble multi-disk brake B2

AR27.50-P-0880W

Disassemble/assemble multi-disk brake B2

18.12.12

TRANSMISSION

722.9, 724.2

5

Clutch pack B2

105

End disk

5t

Disk spring

105a

Externally toothed plate

61a

External plate carrier B2

105s

Retaining ring

61b

Piston guide

161a

Sealing ring

61f

Spring cup

161b

Sealing ring

61k

Piston

161i

Sealing ring

61r

Guide ring

161k

Sealing ring

61s

Retaining ring

161r

Sealing ring

61t

Disk spring

61a

External plate carrier B2

61b

Piston guide

61f

Spring cup

61r

Guide ring

61s

Retaining ring

A

Hole

B

Hole



Notes on automatic transmission

AH27.19-P-0001-01NKB



Remove

1

Remove disk pack B2 (5)

AR27.50-P-0782W


Cleanliness is essential when working on the transmission.
Otherwise, even the smallest foreign particle in the hydraulic components of the transmission can lead to malfunctions or a total failure of the transmission.

 For cleaning, use lint-free cleaning cloth. Chamois leathers are the most suitable.



Disassemble

2

Remove retaining ring (105s) and end disk (105)

3

Remove disk pack B2 (5), externally toothed plate (105a) and disk spring (5t)

 Check disks for scorch marks and wear, replace if necessary.

4

Place assembly device on disk spring (61t) and tension until retaining ring (61s) is exposed

 Assembly device

*140589134300

5

Remove circlip (61s)

 Pliers

*000589523700

6

Remove assembly device

7

Remove spring cup (61f) and disk spring (61t)

8

Remove guide ring (61r) and piston (61k); to do so, blow compressed air into hole (B) of piston guide (61b)

 Blow compressed air in carefully.

9

Separate piston guide (61b) from external plate carrier B2 (61a); to do so, blow compressed air into hole (A)

 Blow compressed air in carefully.

 The external plate carrier B2 (61a) also serves as the piston for the multidisk brake B3.



Assemble

10

Assemble piston guide (61b) and external plate carrier B2 (61a)

AR27.50-P-0880-01W

 Replace the sealing rings (161a, 161b, 161i). With sealing rings (161a, 161b), the rounded edges must face outward.



TRANSMISSION 722.9

*BA27.40-P-1005-01A



TRANSMISSION 724.2

*BA27.19-P-1006-01C

11

Install piston (61k)

 Replace the sealing ring (161k).
The rounded off edges must point outwards.

12

Insert guide ring (61r)

 Replace the sealing ring (161r).
The rounded off edges must point outwards.

13

Insert disk spring (61t) and spring cup (61f)

 Insert the disk spring (61t) with the curvature toward the spring cup (61f).

14

Place assembly device on disk spring (61t) and tension until groove for circlip (61s) is exposed

 Assembly device

*140589134300

15

Install circlip (61s)

 Pliers

*000589523700

16

Remove assembly device

17

Install disk spring (5t), external plate (105a) and disk pack B2 (5)

 Insert disk spring (5t) in such a way that curvature of the inner circumference points toward the piston (61k).
Observe insertion sequence when inserting disks:





Survey of multiple-disc components, production details
TRANSMISSION 722.9

GF27.51-P-5200W

18

Install end disk (105) and retaining ring (105s)



End disk modified

TRANSMISSION 722.9

BT27.50-P-0015-01W



Measure

19

Measure and adjust clearance

TRANSMISSION 722.9, 724.2Multidisk brake B1, B2, B3 and multidisk clutch K1, K2, K3

AR27.51-P-7229W



Install

20

Install disk pack B2 (5)

AR27.50-P-0782W

 Housing

Number

Designation

TRANSMISSION 722.9

BA27.40-P-1005-01A

Bolt, multi-disk brake B2 to transmission housing

Stage 1

Nm

10

Stage 2

°

90

 Electrohydraulic controller unit

Number

Designation

TRANSMISSION 724.2

BA27.19-P-1006-01C

Bolt, multi-disk brake B2 to transmission housing

Stage 1

Nm

10

Stage 2

°

90