Automatic gearbox - Jatco (Torque Converter): Description and operation (page 3 of 4)

Unlock Condition

2

1

12

11

5

9

M44 1623

1 Impeller 2 Turbine 3 Lock-up clutch 4 Release pressure 5 Lock-up control valve 6 Drain port

6 7

9

7 Torque converter pressure 8 Lock-up solenoid 9 Fluid cooler 10 Torque converter applied pressure 11 Lubrication 12 Input shaft

The unlock release pressure is supplied via the control valve to the lock-up clutch. The pressure forces the clutch mechanism away from the torque converter and moves the lock-up mechanism into the unlock condition. The torque converter pressure is decayed to the drain port, removing the applied pressure from the torque converter, allowing the clutch mechanism to move.