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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Automatic Transmission - 6T40 - Description And Operation) >> Description and Operation >> Drive Range, Third Gear (Gen 2) >> 3-5-Reverse Clutch Applies

3-5-Reverse Clutch Applies

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3-5 R Pressure Control (PC) Solenoid 

The 3-5 R PC solenoid is commanded ON, allowing actuator feed limit fluid to enter the PCS 3-5 reverse clutch fluid circuit. PCS 3-5 reverse clutch fluid is routed through orifice #2-6 to the 3-5-reverse clutch regulator valve.

3-5-Reverse Clutch Regulator Valve 

PCS 3-5 reverse clutch fluid, at the 3-5-reverse clutch regulator valve, opposes 3-5-reverse clutch regulator valve spring force and 3-5 reverse clutch feedback fluid pressure to regulate 3-5 reverse clutch feed/drive 1-6 pressure into the 3-5 reverse clutch circuit. The 3-5 reverse clutch fluid is then routed through orifice #25 to the 3-5-reverse clutch assembly, through orifice #6 to the spring end of the 3-5-reverse clutch regulator valve and through orifice #33 to the #4 ball check valve.

3-5-Reverse Clutch 

3-5 reverse clutch fluid enters the 3-5-reverse and 4-5-6 clutch housing assembly to move the 3-5-reverse clutch piston against spring force and exhaust backfill fluid pressure to apply the 3-5-reverse clutch plates.

#4 Ball Check Valve 

3-5 reverse clutch feed fluid unseats the #4 ball check valve, allowing excess pressure to pass into the actuator feed limit circuit. This helps to control clutch apply fluid pressure and clutch apply feel.

Accumulator 

PCS 3-5 reverse clutch fluid is also routed to an accumulator valve. The accumulator valve is used to dampen any pressure irregularities occurring in the PCS 3-5 reverse clutch fluid circuit. This helps to control clutch apply fluid pressure and clutch apply feel.