Hydraulic Control

Hydraulic Control

The hydraulic control system is controlled by the ATF pump, the valves, and the solenoid valves. The ATF pump is driven by the input shaft. The ATF pump and the input shaft are linked by the ATF pump drive chain and the sprockets. Fluid from the ATF pump flows through the pressure high (PH) regulator valve to maintain specified pressure to the drive pulley, the driven pulley, and the manual valve.

The lower valve body assembly includes the main valve body, the secondary valve body, the CVT driven pulley pressure control valve, the CVT start clutch pressure control valve, and the CVT drive pulley pressure control valve.

The manual valve body is bolted on the intermediate housing, and houses the manual valve which switches hydraulic pressure to meet with the shift lever position.

Main Valve Body

The main valve body contains the start clutch shift valve, the shift inhibitor valve, the lubrication regulator valve, and the cooler relief valve.

^ Start Clutch Shift Valve
When a control system malfunction occurs, the start clutch shift valve receives shift inhibitor pressure (SI) and covers the lubrication pressure bypass circuit port.
^ Shift Inhibitor Valve
The shift inhibitor valve switches the fluid passage to switch the start clutch control from electronic control to hydraulic control when the electronic control system is faulty.
^ Lubrication Regulator Valve
The lubrication regulator valve stabilizes the lubrication pressure to the internal circuit.
^ Cooler Relief Valve
The cooler relief valve stabilizes the ATF cooler pressure and recirculation pressure to the ATF cooler and to the internal circuit.





Secondary Valve Body

The secondary valve body contains the pressure high (PH) regulator valve, the pressure high control (PHC) shift valve, the start clutch back-up valve, the clutch reducing valve, and the start clutch accumulator valve.

^ PH Regulator Valve
The PH regulator valve maintains hydraulic pressure supplied from the ATF pump, and supplies PH pressure to the hydraulic control circuit and the lubrication circuit. PH pressure is regulated at the PH regulator valve by the PH control pressure (PHC) from PHC shift valve.
^ PHC Shift Valve
The PHC shift valve supplies PH control pressure (PHC) to the PH regulator valve to regulate PH pressure in accordance with the drive pulley control pressure (DRC) or driven pulley pressure (DNC).
^ Start Clutch Back-up Valve
When a control system malfunction occurs, the start clutch back-up valve supplies start clutch control B pressure (CCB) based on shift inhibitor pressure (SI) to the start clutch.
^ Clutch Reducing Valve
The clutch reducing valve receives PH pressure from the PH regulator valve and regulates clutch reducing pressure (CR).
^ Start Clutch Accumulator Valve
The start clutch accumulator valve stabilizes the hydraulic pressure that is supplied to the start clutch.





CVT Driven Pulley Pressure Control Valve

The CVT driven pulley pressure control valve contains the driven pulley control valve with the solenoid and pulley control valve A. The driven pulley control valve controls pulley control valve A's position, which applies driven pulley pressure (DN) to the driven pulley.

CVT Drive Pulley Pressure Control Valve

The CVT drive pulley pressure control valve contains drive pulley control valve with the solenoid and pulley control valve B. The drive pulley control valve controls the position of pulley control valve B which applies drive pulley pressure (DR) to the drive pulley. The combination of the CVT driven pulley pressure control valve and the CVT drive pulley pressure control valve, applies pulley control pressures to the respective pulleys creates complete power transfer, eliminating steel belt slippage and increasing belt life.

CVT Start Clutch Pressure Control Valve

The CVT start clutch pressure control valve consists of the start clutch pressure control valve and the solenoid. The CVT start clutch pressure control valve controls start clutch engagement according to the throttle opening.





Manual Valve Body

The manual valve body contains the manual valve and the reverse inhibitor valve. The manual valve body is bolted on the intermediate housing.

^ Manual Valve
The manual valve mechanically uncovers/covers the fluid passage according to the shift lever position.
^ Reverse Inhibitor Valve
The reverse inhibitor valve is controlled by reverse inhibitor (RI) pressure from the reverse inhibitor solenoid. The reverse inhibitor valve intercepts the hydraulic pressure flowing to the reverse brake while the vehicle is moving forward at speeds over about 6 mph (10 km/h).