Page 41 - Hydra-matic 6 Speed RWD Technician's Guide (October 2005)

HYDRAULIC CONTROL COMPONENTS

VALVES LOCATED IN THE LOWER CONTROL VALVE BODY
Clutch Select Valve 2 (352): Torque Converter Clutch (TCC) Regulator Valve (355):
Responds to orificed CSV2 enable fluid pressure and force from The TCC regulator valve is controlled by PCS TCC fluid pres-
the clutch select valve 2 spring (353). In Park, Reverse, Neutral sure on one side of the valve and spring force from the TCC
and Drive 1st (Engine Braking) the clutch select valve 2 is regulator apply valve spring (347) at the other end. When the
applied (moved against spring force) to allow CBR1/456 clutch TCC PC solenoid is energized and PCS TCC fluid pressure is
feed fluid to be routed through the valve and then to the CBR1 present, the valve regulates Drive 1-6 fluid pressure into the
clutch feed circuit and clutch select valve 3 (352). In Drive 1st, regulated apply fluid passage to the TCC control valve (227)
2nd, 3rd, 4th, 5th and 6th ranges CSV2 latch fluid pressure and located in the pump. This fluid is then directed to the torque
clutch select valve 2 spring force moves the valve to a released converter to apply the TCC. The TCC regulator apply valve can
position. With the valve in this position, Drive fluid from the also be applied by Solenoid 2 fluid acting on the TCC regulator
manual valve can pass through the valve and enter the Drive 1-6 shuttle valve (338). This is done to enable a diagnostic to be run
fluid circuit and fluid from the CBR1/456 clutch feed circuit is to determine if the TCC control valve is in the correct position.
directed to the 456 clutch feed circuit.
• TCC regulator valve stuck in the release position would
cause no TCC/slip or soft apply.
Clutch Select Valve 3 (352): • TCC regulator valve stuck in the apply position would
Responds to orificed CSV3 enable fluid pressure and force from cause harsh TCC apply.
the clutch select valve 3 spring (353). In Reverse gear range
only, the clutch select valve 3 is released to allow reverse fluid Manual Valve (354):
pressure to pass through the valve and enter the 3-5 clutch The manual valve is fed by line pressure from the fluid pump
reverse feed fluid circuit. Also, CBR1/CBR feed fluid passes assembly and is mechanically linked to the gear selector lever
through the valve and enters the CBR fluid circuit. When CSV3 and the transmission manual shift shaft position switch. When a
enable fluid pressure applies the valve, CBR fluid exhausts and gear range is selected, the manual valve directs line pressure
456 clutch feed fluid passes through the valve to enter the 456 into the various circuits by opening and closing feed passages.
clutch fluid circuit in Drive 4th, 5th or 6th gear ranges. The circuits that are fed or exhausted by the manual valve are
Reverse, and Drive.

Compensator Feed Regulator Valve (356): Stuck, misaligned or damaged, the manual valve and linkage could
Line pressure at the compensator feed regulator valve is routed cause:
through the valve and into the compensator feed fluid circuit. • No reverse
Compensator feed fluid is routed to the end of the valve, and • No Drive
spring force acting on the other end of the valve, regulate com- • Stuck in drive or reverse
pensator feed fluid pressure. Compensator feed fluid is then
routed to the compensators of the 1-2-3-4 clutch, 3-5 reverse
clutch and the 4-5-6 clutch assemblies.

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