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Home >> Mercedes Benz >> 2017 >> GLS450 >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> Automatic Transmission - 166 Chassis 2 Of 4 >> Testing & Repair >> Remove/Install Intelligent Servo Module - AR27.19-P-0550GQ

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

Transmission 722.9 in model 166 

Transmission 722.9 in model 292 

MODIFICATION NOTES

05.03.2020 Document completely revised.    

Shown on model 166 with 4MATIC 

G14134992Courtesy of MERCEDES-BENZ USA
G14134993Courtesy of MERCEDES-BENZ USA
DANGER 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
Notice  Notes on threaded connections fastened using a tightening angle-based tightening process   AH00.00-P-0020-01A
  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
REMOVINGINSTALLING Remove/install     
1 Release parking brake.    
2 Disconnect ground line from battery.   AR54.10-P-0003GZ
  Notes on battery   AH54.10-P-0001-01A
3 Remove appropriate section of underfloor paneling.   AR61.30-P-1001GQ
4 Remove front propeller shaft from output flange to front axle of 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
IMPORTANT Mark the position of the front propeller shaft on the output flange.
AR41.10-P-0070-03GZ
    INSTALLATION IMPORTANT Observe tightening procedure for front propeller shaft.  
    TORQUE SPECIFICATION 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 
    SPECIAL TOOL Retainer wrench Fig 2
5 Remove rear engine crossmember and lower Transmission slightly. 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
AR22.10-P-1180GQ
    Transmission 722.9 in model 292 with engine 642
IMPORTANT Lower Transmission until retaining clips (A) on vent hose (2) can be accessed.
AR22.10-P-4360OGR
6 Open retaining clips (A) of vent hose (2) on Transmission housing.    
7 Release and disconnect electrical connector (3a) from intelligent servo module ISM (5).    
8 Unscrew screws (4) from intelligent servo module ISM (5). TORQUE SPECIFICATION Standard Bolt/hexagon-spacer Bolt, shift module (ISM) to Transmission housing *BA27.40-P-1021-01A 
9 Remove intelligent servo module ISM (5) with vent hose (2). INSTALLATION IMPORTANT The position of the range selector shaft (3) and intelligent servo module ISM (5) must match.
If intelligent servo module ISM (5) is reused:

Do not detach vent hose (2) because a leaky connecting point results in water entry.
 
10.1 Turn range selector shaft (3) of Transmission clockwise up to end stop at P-Parking position When reusing intelligent servo module ISM (5).
IMPORTANT The intelligent servo module ISM (5) is at the P-Parking position.
 
    SPECIAL TOOL Assembly tool Fig 1
10.2 Turn range selector shaft (3) of Transmission counterclockwise up to end stop at "D" position (arrow). When replacing intelligent servo module ISM (5).
IMPORTANT The intelligent servo module ISM (5) is set to "D" position (arrow) in as-delivered condition.
 
    SPECIAL TOOL Assembly tool Fig 1
11 Replace vent hose (2) of intelligent servo module ISM (5). When replacing intelligent servo module ISM (5).  
12 Install in the reverse order.    
13.1 Read out fault memory with vehicle diagnosis system and delete if necessary. When reusing intelligent servo module ISM (5).  
REFER TO SELF DIAGNOSTIC SYSTEMS     AD00.00-P-2000-04A
13.2 Commission intelligent servo module ISM (5). When replacing intelligent servo module ISM (5).  
REFER TO SELF DIAGNOSTIC SYSTEMS     AD00.00-P-2000-04A
HOUSING

Number Designation Transmission 722.9
BA27.40-P-1021-01A Standard Bolt/hexagon-spacer Bolt, shift module (ISM) to Transmission housing Stage 1 Nm 4
Stage 2 ∠ ° 90
PROPELLER SHAFT

Number Designation Model 166 Model 292
BA41.10-P-1003-01F Self-locking Bolt, drive shaft to transfer case (to front axle) Stage 1 Nm 40 40
Stage 2 ∠ ° 90 90
Fig 1: Identifying Assembly Tool (722 589 03 09 00)
G07494441Courtesy of MERCEDES-BENZ USA
Fig 2: Identifying Retainer Wrench (164 589 02 07 00)
G07212216Courtesy of MERCEDES-BENZ USA