Mercedes-Benz ML320. Service manual - part 158

Fig. 49: Upshift/Downshift Solenoid Valve, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA. 

Operation - If a shift solenoid valve (Y3/6y3, Y3/6y4, Y3/6y5) is actuated via the ETC control module 
(N15/3), it opens and directs the control pressure (p-SV) to the command valve assigned (31). See Fig. 49. 

The respective shift solenoid valve (Y3/6y3, Y3/6y4, Y3/6y5) remains actuated and therefore open until the 
shift process is completed. The shift pressure (p-SV) to the command valve is reduced to zero as soon as the 
respective shift solenoid valve (Y3/6y3, Y3/6y4, Y3/6y5) is switched de-energized. 

Automatic Transmission, Location Of Components, Floor Shift (With Touch Shift) 

Fig. 50: Automatic Transmission, Location Of Components, Floor Shift 
Courtesy of MERCEDES-BENZ OF NORTH AMERICA. 

Location/Task/Design/Function Of Oil Pump 

 

2001 Mercedes-Benz ML320 

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

  

me 

 

Fig. 51: Location/Task/Design/Function Of Oil Pump 
Courtesy of MERCEDES-BENZ OF NORTH AMERICA. 

Oil Pump, Location 
 
The oil pump (crescent-type pump) (6) is installed in the torque converter housing behind the torque 
converter and is driven by the drive flange of the torque converter. See Fig. 51. 

Oil Pump, Task 
 
To produce the necessary oil pressure for the hydraulic sequences. 

Oil Pump, Design 
 
An external gear (6a) which is mounted eccentrically in the pump housing is located on the internal gear 
(6b) which is connected to the drive flange (6b). The crescent (6c) drives the external gear (6a). 

Oil Pump, Function 
 
When the engine is running oil is delivered through the suction gallery (6e) along the top and bottom side 
of the crescent (6c) to the pressure chamber (6d) of the housing. The meshing of the teeth prevents oil 

 

2001 Mercedes-Benz ML320 

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

  

me 

 

from flowing from the pressure side to the suction side. 

Park Pawl, Location/Task/Design/Function 

Fig. 52: Park Pawl, Location/Task/Design/Function 
Courtesy of MERCEDES-BENZ OF NORTH AMERICA. 

Park Pawl, Location 
 
The park pawl gear (4) and park pawl mechanism (4a) are located in the rear part of the transmission 
housing. See Fig. 52. 

Park Pawl, Task 
 
Secures the vehicle mechanically to prevent it from rolling in addition to the parking brake. 

Park Pawl, Design 
 
See PARK PAWL, DESIGN. 

Park Pawl, Function 
 
See PARK PAWL, FUNCTION.  

Park Pawl, Design 

 

2001 Mercedes-Benz ML320 

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

  

me 

 

Fig. 53: Park Pawl, Design 
Courtesy of MERCEDES-BENZ OF NORTH AMERICA. 

Park Pawl, Function 

 

2001 Mercedes-Benz ML320 

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

  

me