The basic action of the valves in the hydraulic system can be summarized in a simple line diagram.
The primary regulating valve maintains line pressure in the system.
Line pressure is directed to the manual valve and to the throttle valve at all times.
The secondary regulating valve determines the pressure in the converter and in the lubricating circuits.
The manual valve directs line pressure to the shift valves and to the governor valve.
The shift valves direct line pressure to the band and clutch servos.
Governor pressure is directed to one end of the shift valves, while throttle valve pressure is directed to the other end.
Throttle pressure is also directed to the spring end of the primary regulating valve to boost line pressure as required.
