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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Transmission >> Hydraulic Diagrams >> Automatic Transmission - 6T70 - Description And Operation >> Description and Operation >> Drive Range, Third Gear >> 3-5 Reverse Clutch Applies

3-5 Reverse Clutch Applies

3-5-R Pressure Control Solenoid 2 

The 3-5-R pressure control Solenoid 2 is commanded ON allowing actuator feed fluid to enter the pressure control solenoid (PCS) 3-5 Reverse Clutch fluid circuit. PCS 3-5 Reverse Clutch fluid is routed through orifice #36 and then to the 3-5 reverse clutch regulator valve. PCS 3-5 Reverse Clutch fluid is also routed through orifice #37 and then to the 3-5 reverse clutch boost valve.

3-5 Reverse Clutch Boost Valve 

PCS 3-5 Reverse Clutch fluid pressure acts on a differential area moving the 3-5 reverse clutch boost valve against the 3-5 reverse clutch boost valve spring. The 3-5-Reverse clutch fluid passes through the valve and enters the 3-5-Reverse clutch feedback circuit. As PCS 3-5 Reverse Clutch fluid pressure is increased to a given value, the 3-5 reverse clutch boost valve opens the 3-5-Reverse clutch feedback circuit to exhaust. This results in the 3-5- reverse clutch regulator valve moving to the full feed position sending full 3-5-Reverse clutch feed pressure (full line pressure) to the clutch.

3-5 Reverse Clutch Regulator Valve 

PCS 3-5 Reverse Clutch fluid moves the 3-5 reverse clutch regulator valve against 3-5 reverse clutch regulator valve spring force and 3-5-Reverse clutch feedback fluid. This allows 3-5-Reverse feed to pass through the valve and enter the 3-5-Reverse clutch circuit. The 3-5-Reverse clutch fluid is then routed to the 3-5 reverse clutch, the 3-5 reverse boost valve and the clutch select valve 2. When the 3-5 reverse clutch regulator valve is in this position, PS 2 fluid from the pressure switch 2 exhausts through the valve allowing the switch to close.

3-5 Reverse Clutch 

The 3-5-Reverse clutch fluid enters the 3-5-reverse/4-5-6 clutch housing to move the piston against spring force to apply the 3-5-reverse clutch plates.