Disassemble/assemble multi-disk brake B2 - AR27.50-P-0880A

TRANSMISSION 722.6

Fig 1: Exploded View Of Multi-Disk Brake B2 (1 Of 2)

Courtesy of MERCEDES-BENZ USA

Fig 2: Exploded View Of Multi-Disk Brake B2 (2 Of 2)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Assembly Tool And Snap Ring

Courtesy of MERCEDES-BENZ USA

Fig 4: Identifying Piston B2, Piston Guide Ring And Valve

Courtesy of MERCEDES-BENZ USA

Oil pressure supply:

Fig 5: Identifying Bores For Piston, B2/Reciprocal And B2/Switching Sides (Oil Pressure Supply)

Courtesy of MERCEDES-BENZ USA

MODIFICATION NOTES

4.12.07

Reference to modified end disk inserted

Step 16

BT27.50-P-0015-01W

	Removing
1	Remove disk pack B2 (134)		AR27.50-P-0781A
	Disassemble
2	Remove snap ring (134a)
3	Remove disk pack B2 (134) and disk spring (134b) from external plate carrier B2	The external plate carrier B2 for the multidisk brake B2 also serves as the piston B3 for the multidisk brake B3. Check multi-disks for scorch marks and wear.
4	Place assembly device (074) on disk spring (29) and tension until groove for snap ring (31) is exposed (picture C)		Fig 6
5	Remove snap ring (31)
6	Remove spring plate (30) and disk spring (29)
7	Separate piston guide ring (28) and piston/multidisk brake B2 (27) from piston B3 (14a); to do so, blow compressed air into hole (D) (picture E)
8	Press piston guide ring (28) out of piston B2 (27)
	Peak-to-valley height on piston B2 changed		BT27.50-P-0009-01A
	Piston B2 modified		BT27.50-P-0010-01A
9	Separate piston guide (32) from piston B3 (14a); to do so, blow compressed air into hole (A) (picture E)
	Assemble
10	Assemble piston guide (32) and piston B3 (14a) at correct position		AR27.50-P-0880-01A
11	Insert piston/multidisk brake B2 (27) into piston B3 (14a)	Check all seal rings; replace if necessary With seal rings (14c), (28a) and (28b), the rounded edges must face outward. With seal ring (14d), the rounded edges must face inward. (Picture B)
12	Insert piston guide ring (28)	The valve (137) in the piston guide ring must be at the top (picture D) .
13	Insert disk spring (29) and spring plate (30)	Insert the disk spring with the curvature toward the spring plate.
14	Place assembly device (074) on disk spring (29) and tension until groove for snap ring (31) is exposed		Fig 6
15	Insert snap ring (31)
16	Insert disk spring (134b) and disk pack B2 (134) into external plate carrier B2 and measure	Observe externally-toothed plate sequence.	AR27.50-P-0880-02A
		Play in multiple-disc brake B2	*BE27.50-P-1002-02B
			Fig 7
	Survey of multi-disk components, production details		GF27.51-P-5200A
	End disk modified		BT27.50-P-0015-01W
17	Attach snap ring (134a)
	Install
18	Install disk pack B2 (134).		AR27.50-P-0781A

ADJUSTMENT VALUES OF MULTI-DISK CLUTCH

Number	Designation				Transmission 722.6
BE27.50-P-1002-02B	Play in multiple-disc brake B2	Number of multiple-discs	4	mm	1.90...2.30
			5	mm	2.00...2.40
			6	mm	-

Fig 6: Identifying Assembly Tool (140 589 13 43 00)

Courtesy of MERCEDES-BENZ USA

Fig 7: Identifying Thrust Device (208 589 00 21 00)

Courtesy of MERCEDES-BENZ USA