Disassemble/assemble multi-disk brake B1 - AR27.50-P-0870W

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TRANSMISSION 722.9, 724.2

MODIFICATION NOTES

26.8.14	"Remove main components of the transmission" added.	Operation step 1
26.8.14	"Install main components of the transmission" added.	Operation step 29

Fig 1: Multi-Disk Brake B1 Components (1 Of 3)

Courtesy of MERCEDES-BENZ USA

Fig 2: Multi-Disk Brake B1 Components (2 Of 3)

Courtesy of MERCEDES-BENZ USA

Fig 3: Multi-Disk Brake B1 Components (3 Of 3)

Courtesy of MERCEDES-BENZ USA

	Notes on automatic transmission		AH27.19-P-0001-01NKB
	Remove
1	Remove main components of transmission		AR27.50-P-0610W
	Disassemble
2	Remove bearing (16l) and check for wear	TRANSMISSION 722.9 as of 1/1/05, 724.2 The bearing (16l) is stuck on the inside diameter of the Ravigneaux set and is removed when the planetary gear set is removed. If necessary: ↓ Replace bearing (16l).
	Check
3	Check thrust bearing (161) and bearing (162) for swirl marks and damage	The thrust bearing (161) and bearing (162) together with the external plate carrier (16a) form a single unit and must always be replaced together. If necessary: ↓ Replace thrust bearing (161) and bearing (162).
4	Remove retaining ring (105s) and end disk (105)
5	Remove clutch pack (5) and disk spring (5t)	Check the disks for scorch marks and wear; replace if necessary.
6	Place external plate carrier (16a) in lever press	The external plate carrier (16a) may not be disconnected from the torque converter housing. Therefore place the external plate carrier (16a) with the torque converter housing in a lever press. Workshop press (stationary)
7	Place thrust device on disk spring (16t)	Position thrust device precisely (see arrow in second picture) to enable retaining ring (16s) to be removed later.
		Pressing tool	Figure
		Set of drifts	Figure
8	Actuate lever press until retaining ring (16s) is exposed	Stop lever press stoke as soon as accessibility to groove is sufficient. Excess force will otherwise cause damage.
9	Remove retaining ring (16s) from groove
10	Move back lever press
11	Take thrust device and external plate carrier (16a) out of lever press
12	Remove retaining ring (16s)
13	Remove disk spring (16t)
14	Remove piston (16k) from external plate carrier (16a)	Check vulcanized seal for damage and wear, replace piston (16k) if necessary.
	Check
15	Check external plate carrier (16a) for damage and wear	Depending on the production date, an external plate carrier without inner phase (1a) or an external plate carrier with inner phase (2a) is installed (see the arrows in the third picture). This is why it is necessary to note the parts information in the EPC later on when installing a new retaining ring (16s).
	Assemble
16	Install piston (16k)
17	Install disk spring (16t)	Insert disk spring (16t) in such a way that curvature of inner circumference points toward piston (16k).
18	Fit retaining ring (16s)	Final installation is only possible when the lever press is actuated.
19	Place external plate carrier (16a) in lever press
20	Place thrust device on disk spring (16t)	Position thrust device precisely (see arrow in second picture) to enable retaining ring (16s) to be installed.
		Pressing tool	Figure
		Set of drifts	Figure
21	Actuate lever press until groove of retaining ring (16s) is exposed	Stop lever press stoke as soon as accessibility to groove is sufficient. Excess force will otherwise cause damage to the external plate carrier (16a).
22	Install retaining ring (16s)	Note the installation position of the retaining ring (16s). If installed incorrectly, the disk spring (5t) jams.
23	Move back lever press
24	Take thrust device and external plate carrier (16a) out of lever press
25	Install disk spring (5t) and disk pack (5) in external plate carrier (16a)	Insert disk spring (5t) in such a way that curvature of inner circumference points toward piston (16k). Observe insertion sequence when inserting disks: ↓ Survey of multi-disk components, production details
		TRANSMISSION 722.9	GF27.51-P-5200W
26	Install end disk (105) and retaining ring (105s)
	Measure
27	Measure and adjust clearance	TRANSMISSION 722.9, 724.2 Multidisk brake B1, B2, B3 and multidisk clutch K1, K2, K3	AR27.51-P-7229W
28	Insert bearing (16l)	TRANSMISSION 722.9 as of 1/1/05 TRANSMISSION 724.2 The bearing (16l) is mounted when the planetary gear set is installed.
	Install
29	Install main components of transmission		AR27.50-P-0610W

Fig 4: Identifying Set Of Drifts (722 589 04 15 00)

Courtesy of MERCEDES-BENZ USA

Fig 5: Identifying Pressing Tool (722 589 01 31 00)

Courtesy of MERCEDES-BENZ USA