Low & Reverse Clutch Releases

Shift Solenoid 1 

When shift Solenoid 1 is "turned OFF", CSV 2 enable fluid from the clutch select valve 2 passes by the #2 ball check valve and enters the Solenoid 1 fluid circuit. Solenoid 1 fluid from the #2 ball check valve and TCC regulator valve is then routed to the solenoid where it exhausts.

Clutch Select Valve 2 

Clutch select valve 2 (CSV 2) enable fluid is exhausted from the clutch select valve 2 and clutch select valve 2 spring force moves the valve to the released position. With clutch select valve 2 in the released position, drive fluid from the manual valve passes through the valve and enters the drive 1-6 fluid circuit. Drive 1-6 fluid then feeds the R-1/4-5-6 and 3-5 Reverse Clutch regulator valves and the TCC regulator valve.

R-1/4-5-6 Pressure Control Solenoid 3 

The R-1/4-5-6 pressure control Solenoid 3 is commanded OFF allowing PCS R-1/4-5-6 fluid from the R-1/4-5-6 clutch regulator valve and 4-5-6 clutch boost valve to exhaust.

R-1/4-5-6 Clutch Regulator Valve 

R-1/4-5-6 clutch regulator valve spring force moves the valve to exhaust the R-1/4-5-6 clutch feed circuit and allow drive 1-6 fluid to enter the PS4 fluid circuit. PS4 fluid is then routed to the normally-closed pressure Switch 4 and opens the switch. PS4 fluid is also routed to the #4 ball check valve and flows into the CSV 2 latch fluid circuit.

#4 Ball Check Valve 

PS4 fluid pressure seats the #4 ball check valve against the 4-5-6 clutch fluid circuit. PS4 fluid is then directed into the CSV 2 latch fluid circuit and routed to the clutch select valve 2. CSV 2 latch fluid combines with clutch select valve 2 spring force and holds the valve in this position during all 6 forward gear ranges.

#5 Ball Check Valve 

Drive 1-6 fluid pressure seats the #5 ball check valve against the 3-5-Reverse clutch feed fluid passage. Drive 1-6 fluid is then directed into the 3-5-R supply fluid circuit which is routed to the #7 ball check valve and orifice #16.

#7 Ball Check Valve 

The 3-5-R supply fluid seats the #7 ball check valve against the 3-5-R feed fluid passage to force 3-5-R supply fluid through orifice #16 before entering the 3-5-R feed circuit. The 3-5-R feed fluid is then routed to the 3-5 reverse clutch regulator valve.

Low and Reverse Clutch 

Low and reverse clutch spring force moves the low and reverse clutch piston which forces R-1 fluid out. R-1 fluid is routed to the clutch select valve 2 where it enters the exhaust backfill circuit. The low and reverse clutch is in the released position.