SSANGYONG KYRON 2010.01 Manual page 575

01-27
3410-01
(2) Pump cover
▶ Primary regulator valve
The Primary Regulator Valve (PRV)
regulates the transmission line pressure (or
pump output pressure). This valve gives
either high or low line pressure depending
on whether S6 is switched OFF or ON.
When S6 is switched ON, S6 pressure is
applied to the PRV moving it against spring
pressure and opening the line pressure
circuit to the pump suction port resulting in
reduced line pressure.
Low line pressure is used during light throttle
applications and cruising. Heavy throttle will
cause S6 to switch OFF and thereby cause
high line pressure.
This stepped line pressure control has no
detrimental effect on shift feel because all
shifting pressures are controlled by separate
band and clutch regulator valves, and the
output of S5.
When reverse gear is selected, both the low
and high line pressure values are boosted to
guard against slippage.
This is achieved by applying reverse oil line
pressure to the PRV to assist the spring
load. The other end of the valve contains
ports for line pressure feedback and S6
pressure.
The PRV also regulates the supply of oil to
the converter via the converter feed port.
The cascade effect of the PRV ensures the
first priority of the valve is to maintain line
pressure at very low engine speeds. When
the engine speed increases and the pump
supplies an excess of oil the PRV moves to
uncover the converter feed port thereby
pressurizing the converter. If there is an
excess of oil for the transmission's needs
then the PRV moves further to allow oil to
return to the suction port.
ION 4-SPEED
KYRON 2010.01