Alfa Romeo Selespeed system
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HYDRAULIC SYSTEM - OPERATION
  As can be seen from figures 5 and 6, the CFC 208F control unit, before each gear change, activates the clutch (1) by a servo actuator and a solenoid valve (EV0) controlled by the control unit.

The control function of the gear shaft takes place in these steps:
• Selection lever activation
• Transmission of the selection lever position to the control unit
• Activation of engagement lever
• Transmission of the engagement lever position to the control unit

The components involved in the gear change are:
• Selection actuator
• Selection potentiometer
• Wiring harness between selection potentiometer and sectioning connector
• Selection solenoid valve EV3
• Wiring harness between selection solenoid valve EV3 (gear selection range 1-2) and the sectioning connector
• Selection solenoid valve EV4
• Wiring harness between selection solenoid valve EV4 (gear selection range 5 - R) and the sectioning connector
• Gear engagement actuator
• Engagement potentiometer
• Wiring harness between engagement potentiometer and sectioning connector
• Engagement solenoid valve EV1 (to engage odd gears 1-3-5)
• Wiring harness between engagement valve EV1 and the sectioning connector
• Engagement solenoid valve EV2 (to engage even gears 2-4-R)
• Wiring harness between engagement solenoid valve EV2 and sectioning connector.
   
   

Section of clutch control - gearbox actuators

  
    Key
 1. Clutch control lever on gearbox
2. Gear shaft (engagement and selection control)		  
         
 

HYDRAULIC SYSTEM - DIAGRAM
   

Hydraulic diagram

  
    Key
 1. Engagement solenoid valve 1
2. Engagement solenoid valve 2
3. Selection solenoid valve 3
4. Selection solenoid valve 4
5. Clutch solenoid valve
6. Electric pump
7. Delivery filter
8.
1. Check valve
2. Accumulator
3. Oil tank
4. Clutch actuator
5. Engagement actuator
6. Selection actuator
7. Pressure sensor