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Home >> Saturn >> 2010 >> Sky Red Line, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 18 (Automatic Transmission - 5L40-E/5L50-E - Description And Operation) >> Description and Operation >> Automatic Transmission Hydraulic Diagrams >> Overdrive Range, First Gear (Before First 1-2 Shift) >> Low and Reverse Clutch Applies

Low and Reverse Clutch Applies

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2-3 Shift Solenoid (SS) Valve

The 2-3 SS valve is energized, allowing feed limit fluid to enter the 2-3 signal fluid circuit. 2-3 signal fluid overcomes spring force and applies the 2-3 shift valve (371).

3-4 Shift Control Valve and 3-4 Shift Valve

2-3 signal fluid is routed to the 3-4 shift control valve (346) and applies the valve against spring force. This allows D13 fluid to enter the 123 fluid circuit.

#4 Ball Check Valve

123 fluid seats the #4 ball check valve and passes through orifice #16. This orifice helps to control low and reverse clutch apply.

4-5 Shift Valve

Orificed 123 fluid is routed to the 4-5 shift valve (374) where it passes into the 123 braking fluid circuit.

Low Pressure Control Valve

123 braking fluid is routed to the low pressure control valve (383). This valve regulates 123 braking fluid into the 123 regulated fluid circuit against spring force and orifices 123 regulated fluid pressure.

1-2 Shift Control Valve and 1-2 Shift Valve

2-3 signal fluid is also routed to the 1-2 shift control valve (366) and applies the valve against spring force. This allows feed limit fluid to enter the FDL fluid circuit. FDL fluid is routed to the 1-2 shift valve (387) and applies the valve against spring force. 123 regulated fluid is routed through orifice #20 to the 1-2 shift valve where it passes into the low and reverse clutch fluid circuit.

#8 Ball Check Valve

Low and reverse clutch fluid seats the #8 ball check valve against the reverse lockout fluid passage and enters the low and reverse clutch or reverse lockout fluid passage.

Low and Reverse Clutch

Low and reverse clutch or reverse lockout fluid pressure enters the outer area of the low and reverse clutch piston and moves the piston against spring force to apply the low and reverse clutch plates.