Hydraulic clutch release mechanism: operation - GF25.20-P-5101-03A

Models 203, 208, 209, 211, 230

Fig 1: Identifying Hydraulic Clutch Release Mechanism And Related Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Operation

The pressure plunger (13g) is operated hydraulically and pushed forward on the sleeve (13h). The thrust ring (13b) pushes against the disk spring of the clutch and actuates it.

The internal seal is provided by a collar seal (13f).

The boot (13d) is designed to protect the running surface of the central clutch operator from dirt. The pretension spring (13e) ensures, when the clutch is not operated, that the thrust bearing is subjected always only to a minimal load in order to avoid bearing noises.

Fig 2: Hydraulic Clutch Release Operation Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Function with clutch open

The automated manual transmission control module (N15/6) actuates the automated manual transmission clutch solenoid valve (Y90) in the valve block (B).

The solenoid valve directs the hydraulic pressure (p) into pressure chamber I of the hydraulic central clutch operator (A). The pressure piston (A2) is pushed forward toward the disk spring. The thrust ring pushes against the disk spring of the clutch and opens it.

Fig 3: Hydraulic Clutch Release Function Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Function with clutch closed

The automated manual transmission clutch solenoid valve (Y90) in the valve block (B) is not energized. The return spring holds the solenoid valve in the basic position.

Consequently, pressure chamber I in the hydraulic central clutch operator (A) is pressure less and a link exists to the oil outlet in the oil reservoir (0).