Function of Shift N to D (1ST Gear)

FUNCTION IN SELECTOR LEVER POSITION N
- No pressure is applied to piston B2 (B2a), the shift side and opposite side of the shift are emptied via the selector valve (52)

- The solenoid valve (Y3/6y4) is switched. The shift valve pressure (p-SV) acts on the end face of the command valve 3-4 (31c) against the spring force to the right.

- The holding pressure shift valve 3-4 (28c) is held in the left position by the spring. The shift pressure regulating valve (24) regulates a maximum shift pressure. This reaches the clutch K3 via the shift pressure shift valve 3-4 (29c) and the command valve 3-4 (31c). The overlap regulating valve 3-4 (30c) is held in this right-hand position by the shift pressure.





FUNCTION IN SELECTOR LEVER POSITION D (SHIFT PROCESS)
- The shift pressure is reduced by the regulating solenoid valve (Y3/6y2) via the shift pressure regulating valve (24). As a result the overlap regulating valve 3-4 (30c) moves into the control position. Pressure oil reaches the piston B2 (b2a) on the shift side and opposite side of the shift via the overlap regulating valve 3-4 (30c), the shift pressure shift valve 3-4 (29c), the command valve 3-4 (31c), selector valve (52) and the shift valve B2 (26).

- For comfort reasons the multiple-disc clutch B2 is engaged with a reduced effective area. The holding pressure regulating valve 3-4 (28c) switches to the right as soon as the B2 pressure acting on the end face exceeds the spring force.

Also Refer To:
- Shift Valve Pressure. Shift Pressure Regulating Solenoid Valve
- Holding Pressure Shift Valve. Upshift/Downshift Solenoid Valve
- Shift Pressure Shift Valve. Multiple Disc Brake
- Overlap Regulating Valve. Function of Operating Pressure
- Command Valve. Function of Regulating Valve Pressure