1-2-3-4 Clutch Applies

WARNING: This page is about a different variant/trim than selected.

Manual Valve

The manual valve is moved to the Drive (D) position and allows line fluid pressure to enter the drive fluid circuit. Drive fluid is then routed to the clutch select valve, the #5 ball check valve, and to the 2-6 clutch regulator valve.

#5 Ball Check Valve

Drive fluid unseats the #5 ball check valve and is routed to the 1-2-3-4 clutch regulator valve.

1-2-3-4 Pressure Control (PC) Solenoid

The 1-2-3-4 PC solenoid is commanded ON allowing actuator feed limit fluid to enter the PCS 1-2-3-4 clutch fluid circuit. PCS 1-2-3-4 clutch fluid is then routed through orifice #20 to the 1-2-3-4 clutch regulator valve, and through orifice #17 to the 1-2-3-4 clutch boost valve.

1-2-3-4 Clutch Regulator Valve

PCS 1-2-3-4 clutch fluid, at the 1-2-3-4 clutch regulator valve, opposes 1-2-3-4 clutch regulator valve spring force and 1-2-3-4 clutch feedback fluid pressure to regulate drive fluid pressure into the 1-2-3-4 clutch fluid circuit. The 1-2-3-4 clutch fluid is then routed to the 1-2-3-4 clutch boost valve and through orifice #19 to the 1-2-3-4 clutch.

1-2-3-4 Clutch Boost Valve

PCS 1-2-3-4 clutch fluid pressure acts on a differential area, moving the 1-2-3-4 clutch boost valve against 1-2-3-4 clutch boost valve spring force, to regulate 1-2-3-4 clutch fluid into the 1-2-3-4 clutch feedback circuit. As PCS 1-2-3-4 clutch fluid pressure is increased to a given value, the 1-2-3-4 clutch boost valve opens the 1-2-3-4 clutch feedback circuit to exhaust backfill. This results in the 1-2-3-4 clutch regulator valve moving to the full feed position, sending full 1-2-3-4 clutch feed pressure (full line pressure) to the 1-2-3-4 clutch.

1-2-3-4 Clutch

The 1-2-3-4 clutch fluid enters the transmission case assembly and moves the 1-2-3-4 clutch piston against spring force to apply the 1-2-3-4 clutch plates.

Accumulator

PCS 1-2-3-4 clutch fluid is also routed to an accumulator valve. The accumulator valve is used to dampen any pressure irregularities occurring in the PCS 1-2-3-4 clutch fluid circuit. This helps to control clutch apply fluid pressure and clutch apply feel.