Remove/Install Intelligent Servo Module - AR27.19-P-0550GQ

TRANSMISSION 722.9 in MODEL 166 

TRANSMISSION 722.9 in MODEL 292 

Shown on model 166 with 4MATIC 

	Risk of death  caused by vehicle slipping or toppling off of the lifting platform.	Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.	AS00.00-Z-0010-01A
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Notes on bolted connections with self tapping screws		AH00.00-P-0007-01SF
	Notes on self-locking nuts and bolts		AH00.00-N-0001-01A
	Remove/install
1	Release parking brake
2	Detach ground line from battery		AR54.10-P-0003GZ
	Notes on battery		AH54.10-P-0001-01A
3	Remove relevant section of the underfloor paneling		AR61.30-P-1001GQ
4	Remove rear propeller shaft at output flange to rear axle from transfer case, place to one side and fix in place	Tightening procedure for rear propeller shaft to transfer case	AR41.10-P-0050-17GZ
		Mark the position of the rear propeller shaft on the output flange. Observe the tightening procedure for the rear propeller shaft. Self-locking screw/bolt of propeller shaft at transfer case/adapter housing (to rear axle)	*BA41.10-P-1001-01F
		Retainer wrench	Figure
5	Remove front propeller shaft at output flange to front axle from transfer case, place to one side and fix in place	Transmission 722.9 in model 166 (except 166.006/058) Transmission 722.9 in model 292 Tightening procedure for front propeller shaft Transmission 722.9 in model 166 (except 166.006/058) Transmission 722.9 in model 292 Mark the position of the front propeller shaft on the output flange. Observe tightening procedure for front propeller shaft.	AR41.10-P-0070-03GZ
		Transmission 722.9 in model 166 (except 166.006/058) Transmission 722.9 in model 292 Self-locking bolt, drive shaft to transfer case (to front axle)	*BA41.10-P-1003-01F
		Retainer wrench	Figure
6	Remove rear engine crossmember	Transmission 722.9 in model 166 Transmission 722.9 in model 292 Engine 157 in model 166 with transmission 722.9 Engine 276 in model 166 with transmission 722.9 Engine 278 in model 166 with transmission 722.9 Engine 642 in model 166 with transmission 722.9 Engine 651 in model 166 with transmission 722.9	AR22.10-P-1180GQ
		Transmission 722.9 in model 292 with engine 642	AR22.10-P-4360OGR
7	Open retaining clips (A) of vent hose (2) on transmission housing	Do not cause irreparable damage to the retaining clips (A). Correct routing of the vent hose (2) can otherwise no longer be guaranteed. Lower the drivetrain only far enough to allow the retaining clips (A) on the vent hose (2) to be accessed.
8	Disconnect electrical connector (3a) from intelligent servo module ISM (5)
9	Remove screws/bolts (4) from intelligent servo module ISM (5)	Standard bolt/hexagon-spacer bolt, shift module (ISM) to transmission housing	*BA27.40-P-1021-01A
10	Remove intelligent servo module ISM (5) toward rear
11	Remove intelligent servo module ISM (5) with vent hose (2)	If the removed intelligent servo module ISM (5) is to be reused, do not detach the vent hose. A leaky connecting point can allow water to enter. The position of the range selector shaft (3) and intelligent servo module ISM (5) must match.
12.1	Turn range selector shaft (3) of transmission clockwise up to end stop at P-Parking position	When reusing removed intelligent servo module ISM (5) The intelligent servo module ISM (5) is at the P-Parking position. Assembly tool	Fig 1
12.2	Turn range selector shaft (3) of transmission counterclockwise up to end stop at position D-Drive (arrow)	When replacing intelligent servo module ISM (5) The intelligent servo module ISM (5) is at the D-Drive position. (Arrow) position when delivered Assembly tool	Fig 1
13	Detach vent hose (2)	When the intelligent servo module ISM (5) is replaced, the vent hose (2) must be replaced.
14	Install in the reverse order
15.1	Read out fault memory using the diagnostic system and delete if necessary	When reusing removed intelligent servo module ISM (5)
			AD00.00-P-2000-04A
15.2	Perform initial startup of intelligent servo module ISM (5) using diagnostic system	After replacing intelligent servo module ISM (5)
			AD00.00-P-2000-04A

Fig 1: Identifying Assembly Tool (722 589 03 09 00)

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Retainer Wrench (164 589 02 07 00)

Courtesy of MERCEDES-BENZ USA