Forward Clutch Hydraulic Circuits
When the forward (1, 2, 3, 4) clutch is applied in 1st (above 5 km/h [3 mph]), 2nd, 3rd, and 4th gear, LINE pressure from the pump is directed to the multiplex shift valve by the manual valve through the DRIVE 1 hydraulic circuit. The multiplex shift valve supplies the forward (1, 2, 3, 4) clutch regulator valve with pressure through the DRIVE 2, CB26FD/CB1234FD and CB1234 SUP hydraulic circuits. The forward (1, 2, 3, 4) clutch regulator valve directs regulated pressure to the forward (1, 2, 3, 4) clutch through the CB1234 hydraulic circuit.
When the forward (1, 2, 3, 4) clutch is applied in LOW position and 1st gear (below 5 km/h [3 mph]), LINE pressure from the pump is directed to the multiplex shift valve by the manual valve through the DRIVE 1 hydraulic circuit. The multiplex shift valve directs the pressure to the multiplex manual valve through the REV DRIVE B circuit. The multiplex manual valve directs the REV DRIVE B pressure to the forward (1, 2, 3, 4) clutch regulator valve through the DRIVE B, CB26FD/CB1234FD and CB1234 SUP circuits. The forward (1, 2, 3, 4) clutch regulator valve directs regulated pressure to the forward (1, 2, 3, 4) clutch through the CB1234 hydraulic circuit.
When the forward (1, 2, 3, 4) clutch is released in 5th and 6th gear, DRIVE 2 pressure is directed to the forward (1, 2, 3, 4) clutch regulator valve. Solenoid pressure is not applied to the forward (1, 2, 3, 4) clutch regulator valve and the regulator valve blocks the DRIVE 2 circuit in this position.