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Dismantling and assembling multi-disk brake B1 - AR27.50-P-0870A: Notes

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TRANSMISSION 722.6 

Fig 1: Identifying Multi-Disk Brake B1 Components
G04606599Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Modification notes

25.8.98 New special tool for setting clearance   AR27.50-P-0870-01A 
16.9.02 Multi-disks for B1, K1 and K3 changed Transmission 722.6 as of 02.09.02, refer to step 10. BT27.50-P-0013-01A
DISASSEMBLING Dismantling     
1 Remove snap ring (6h)    
2 Remove multi-disk pack (6g) and spring washer (6f) from external plate carrier NOTES Check multi-disks for scorch marks and wear.  
3 Place assembly device (073) on spring washer (6d) and tension until the snap ring (6e) is exposed SPECIAL TOOL Assembly device Fig 2
4 Remove snap ring (6e)    
5 Remove piston (6c) from the external plate carrier by carefully blowing compressed air into the bore (A).    
ASSEMBLING Assemble     
6 Install piston (6c) in external plate carrier INSPECT Inspect molded gasket, replace if necessary.
IMPORTANT Press in the piston with the assistance of the spring washer (6d) and the assembly device (073).
 
7 Insert spring washer (6d) NOTES Insert spring washer with the curvature towards the multi-disk pack.  
8 Place assembly device (073) on spring washer (6d) and tension until the groove of the snap ring is exposed SPECIAL TOOL Assembly device Fig 2
9 Insert snap ring (6e) NOTES The collar of the snap ring must point towards the multi-disk pack.
After installing, check snap ring for correct seat
 
10 Insert spring washer (6f) and multi-disk pack (6g) in the external plate carrier and measure NOTES Observe outer multi-disk sequence Inserting and measuring multi-disk pack B1: ↓  
    TRANSMISSION 722.6 up to 01.09.02 AR27.50-P-0870-01A 
    SPECIAL TOOL Pressing tool Figure
    Clearance of multi-disk brake B1 *BE27.50-P-1001-02B 
    Transmission 722.6 as of 02.09.02 AR27.50-P-0870-01AA
    SPECIAL TOOL Pressing tool Figure
    Clearance of multi-disk brake B1 *BE27.50-P-1001-02B 
REFER TO COMPONENT MODIFICATIONS Thickness of steel multi-disks B1, K1 and K2 changed Transmission 722.6 BT27.51-P-0002-01A 
REFER TO COMPONENT MODIFICATIONS External plate carrier B1 modified Transmission 722.6 BT27.50-P-0008-01A 
REFER TO COMPONENT MODIFICATIONS Multi-disks for B1, K1 and K3 changed Transmission 722.6 as of 02.09.02 BT27.50-P-0013-01A
REFER TO BASIC KNOWLEDGE Survey of multi-disk components, production details Transmission 722.6 GF27.51-P-5200A 
11 Insert snap ring (6h) IMPORTANT For additional work, see: ↓
Remove/install multi-disk brake B1 and oil pump
AR27.50-P-0721A 
Adjustment values of multi-disk clutch

Number Designation Transmission 722.6 up to 01.09.02 with double sided multi-disks Transmission 722.6 as of 02.09.02 with single-sided multi-disks
BE27.50-P-1001-02B Clearance of multi-disk brake B1 Number of multi-disks 2 mm 2.30...2.70 2.20...2.60
3 mm 2.70...3.10 2.40...2.80
4 mm 3.00...3.40 2.60...3.00
Fig 2: Identifying Assembly Device (140 589 13 43 00)
G04606600Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 3: Identifying Pressing Tool (208 589 00 21 00)
G04606601Courtesy of MERCEDES-BENZ OF NORTH AMERICA.