Hydraulic Operation

Line pressure hydraulic circuits:

• Line pressure from the pump is supplied to the manual valve.
• Line pressure is regulated by the pressure regulator valve.
• The pressure regulator valve is controlled by varying pressure from the LPC  solenoid through the LPC  circuit.

Torque converter circuits:

• Regulated line pressure from the pressure regulator valve is directed to the TCC  control valve through the CONV FD hydraulic circuit.
• When the TCC  is released, CONV FD pressure is directed to the TCC  RELEASE circuit by the TCC  control valve. Pressure from the TCC  RELEASE circuit releases the TCC  .
• Transmission fluid from the TCC  RELEASE returns to the TCC  control valve through the TCC  APPLY circuit.

Cooler and lubrication hydraulic circuits:

• The TCC  control valve directs transmission fluid from the TCC  APPLY circuit (return circuit from the torque converter when the TCC  is released) to the COOLER FEED circuit.
• In the COOLER FEED circuit, transmission fluid flows through the transmission fluid cooler or the thermal bypass valve to the LUBE circuit.

Solenoid hydraulic circuits:

• The LPC  solenoid applies varying pressure to the pressure control valve through the LPC  hydraulic circuit. The LPC  solenoid regulates line pressure by controlling the position of the pressure regulator valve.
• SSA  applies pressure to the forward (1, 2, 3, 4) clutch regulator valve to apply the forward clutch.
• SSB  applies pressure to the direct (3, 5, R) clutch regulator valve to apply the direct clutch.

Clutch hydraulic circuits:

• Line pressure from the manual valve is directed to the multiplex shift valve through the DRIVE 1 hydraulic circuit.
• The multiplex shift valve directs DRIVE 1 pressure to the forward (1, 2, 3, 4) clutch regulator valve through the DRIVE 2, CB26FD/CB1234FD and CB1234 SUP hydraulic circuits. The DRIVE 2 hydraulic circuit also feeds the C35R SUPPLY hydraulic circuit which supplies the direct (3, 5, R) clutch regulator valve with pressure.
• The low/reverse/overdrive (4, 5, 6) clutch regulator valve directs DRIVE 2 pressure to the multiplex shift valve through the VALVE LATCH hydraulic circuit to latch the multiplex shift valve.
• Regulated CB1234 SUP pressure from the forward (1, 2, 3, 4) clutch regulator valve is directed to the forward (1, 2, 3, 4) clutch through the CB1234 hydraulic circuit to apply the clutch.
• To apply the direct (3, 5, R) clutch, SSB  applies varying solenoid pressure to the C35R clutch regulator and boost valves. As the C35R regulator valve moves, it supplies the direct (3, 5, R) clutch and C35R boost valve with regulated line pressure through the C35R circuit. The C35R boost valve directs the regulated line pressure to the opposite side of the C35R clutch regulator valve through the C35R FDBK circuit for gradual direct (3, 5, R) clutch engagement.

For additional hydraulic circuit and information, refer to HYDRAULIC CIRCUITS .