P O W E R T R A I NT R A N S M I S S I O N H Y D R A U L I C C O N T R O LSof spring (1). This opens a passage from the pressuredifferential valve to the reservoir. The oil pressure inthe directional clutch circuit decreases, and the dir-ectional clutch is no longer engaged.Since a speed and direction clutch must both beengaged before power goes through the transmission,SELECTOR AND PRESSURE CONTROL VALVETM 5-3805-258-24-1S Y S T E M S O P E R A T I O Npower does not go through the transmission when theleft brake pedal is pushed.When the left brake pedal is released, the passageto the reservoir is closed. Oil pressure in the direc-tional clutch will then increase until the directionalclutch is engaged. Power then goes through thetransmission.SELECTOR AND PRESSURE CONTROL VALVE1. Speed selection spool. 2. Valve body. 3. Load pieton. 4.Modulation relief valve.5. Pressure differential valve. 6.Oil pressure valve for torqueconverter inlet. 7. Directionselection spool.The selector and pressure control valve is insideDirection selection spool (7) is connected throughthe top cover of the transmission.the transmission neutralizer to the direction controlSpeed selection spool (1) is connected to the speedcable from the transmission control lever.control cable from the transmission control lever.VALVEFUNCTION(1)Speed selection spool.Directs oil to a speed clutch.*(3) Load piston.Controls the rate of pressureincrease in the clutches.(4) Modulation reliefvalve,Controls the maximum pressure in the system.(5) Pressure differential valve.Keeps a pressure differential between the speedand direction clutches.Prevents movement of the machine if the engine is startedwith the transmission in a speed and direction.(6) Ratio valve for converter inlet.Limits the maximum pressureto the torqueconverter.(7) Direction selection SDOOI.IDirects oil to a direction clutch.I3-41
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