Overdrive Clutch Hydraulic Circuits
When the overdrive clutch is applied in 4th, 5th and 6th gears, LINE pressure is supplied to the low/reverse/overdrive (4, 5, 6) clutch regulator valve from the pump. To apply the overdrive (4, 5, 6) clutch, SSD applies varying solenoid pressure to the CBLR/C456 regulator and boost valves. As the CBLR/C456 regulator valve moves, it supplies the multiplex shift valve assembly and CBLR/C456 boost valve with regulated line pressure through the CBLR/C456 SUPPLY circuit. The CBLR/C456 boost valve directs the regulated line pressure to the opposite side of the CBLR/C456 regulator valve through the CBLR/C456 FDBK circuit for gradual overdrive (4, 5, 6) clutch engagement. The multiplex shift valve directs the regulated pressure to the multiplex manual valve through the C456 SUPPLY hydraulic circuit. The multiplex manual valve directs the regulated pressure to the overdrive (4, 5, 6) clutch through the C456 hydraulic circuit. The C456 circuit also supplies pressure to the CB26 clutch regulator valve to boost the pressure from SSC in 6th gear.
When the overdrive (4, 5, 6) clutch is released in PARK, REVERSE, NEUTRAL, 1st gear (below 5 km/h [3 MPH]) and LOW position, LINE pressure is supplied to the low/reverse/overdrive (4, 5, 6) clutch regulator valve from the pump. The low/reverse/overdrive (4, 5, 6) clutch regulator valve is controlled by SSD and directs regulated pressure to the multiplex shift valve through the CBLR/C456 SUPPLY hydraulic circuit. The multiplex shift valve directs the regulated pressure to the low/reverse clutch through the CBLR SUPPLY hydraulic circuit.
When the overdrive (4, 5, 6) clutch is released in 1st (above 5 km/h [3 MPH]), 2nd and 3rd gears, LINE pressure is supplied to the low/reverse/overdrive (4, 5, 6) clutch regulator valve. Solenoid pressure is not applied to the low/reverse/overdrive (4, 5, 6) clutch regulator valve and the regulator valve blocks regulated LINE pressure to the multiplex shift valve assembly.