Disassemble and assemble electrohydraulic control unit - AR27.19-P-0220A

Transmission 722.6 in MODELS 129, 140, 163, 170, 199, 202, 208, 210, 211, 215, 220, 230, 240

Transmission 722.6 in MODELS 461.302 /332 /342 /345, 463.206 /209 /232 /233 /240 /241 /243 /244 /245 /246 /247 /248 /249 /250 /254 /270 /271 /308 /309 /322 /323 /330 /331 /332 /333

Shown on the electrohydraulic control unit in model 163

Fig 1: Identifying Shift Plate, Electrical Control Unit

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Modification notes

24.9.97	Remove caps	Step 1 new
24.9.97	Caps for solenoid valves, new	Step 1	BT27.19-P-0003-01A

	Disassemble/assemble
1	Take off caps of solenoid valves	Only on transmission 722.6 as of 1.8.97
	Caps for solenoid valve, new	Transmission 722.6	BT27.19-P-0003-01A
2	Unscrew bolts (17a, 17b) and remove leaf springs (17)	Installation: Note the different lengths of the bolts (17a, 17b).
2	Unscrew bolts (17a, 17b) and remove leaf springs (17)		*BA27.19-P-1002-01A
3	Use pliers to pull modulating pressure control solenoid valve (Y3/6y1) and shift pressure control solenoid valve (Y3/6y2) out of shift plate (16)	Installation: Check the O-rings on the modulating pressure control solenoid valve (Y3/6y1) and on the shift pressure control solenoid valve (Y3/6y2); fit a new valve if necessary.
3		Pliers	Fig 2
4	Use pliers to pull 1-2 and 4-5 shift solenoid valve (Y3/6y3), 3-4 shift solenoid valve (Y3/6y4) and 2-3 shift solenoid valve (Y3/6y5) out of shift plate (16)	Installation: Check the O-rings on the 1-2 and 4-5 shift solenoid valve (Y3/6y3), 3-4 shift solenoid valve (Y3/6y4) and 2-3 shift solenoid valve (Y3/6y5); fit a new valve if necessary.
4		Pliers	Fig 2
5.1	Remove electric control unit (Y3/6) from shift plate (16)	Transmission 722.6 up to end no. 0026194 Installation: Make sure that the two centering pins of the electric control unit (Y3/6) engage in the shift plate (16).
5.2	Bend retaining lug on stiffening rib on oil-temperature sensor to one side and remove electric control unit (Y3/6) from shift plate (16)	Transmission 722.6 as of end no. 0026195
	Retaining lug added to electrohydraulic control unit	722.6	BT27.19-P-0001-01A
6	Disassemble shift plate (16)	Only when the shift plate (16) is dirty or metal shavings are present in the transmission oil.	AR27.35-P-0350A
7	Assemble in the reverse order

Electrohydraulic control unit

Number	Designation		Transmission 722.6
BA27.19-P-1002-01A	Bolt, solenoid valve to shift plate	Nm	8

Fig 2: Identifying Pliers (606 589 00 37 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.