ZEST BOLT Service Manual

Automated Manual Transmission 6 Electrical Components Of The Hydraulic Unit: Proportional Pressure Solenoid Valve: It controls the pressure of the oil to the two actuator chambers for double effect gear en- gagement- disengagement with two mechanical stable positions according to the command combination (even gears EV2, odd gears EV1). The two solenoid valves are identical and have a maximum flow rate of 7 l/min with a pressure differential of 10 bar. The control current ranges from 0 to 2.5 A and is controlled directly by the control unit. The electrical resistance of the winding is 2.5 ohm +/- 6% at 20°C. Operation: When EV1 is operated, pressurised oil enters the right side of the actuator. In this way, thanks to the rotation of the engagement shaft, the odd gears are engaged. When EV2 is operated, pressurised oil enters the left side of the actuator. In this way, thanks to the rotation of the engagement shaft, the even gears are engaged.