SSANGYONG KYRON 2010.01 Manual page 571

2-3 shift valve
▶
The 2-3 shift valve is a two position valve. It
is used on all 2-3 and 3-2 gearshifts.
The switching of this valve is achieved by S2
which is located at the end of the valve
spool.
In the 1, 2 position, second gear oil from the
1-2 shift valve is prevented from entering the
third gear circuit.
When the valve is moved to the 3, 4
position, oil from the second gear circuit is
routed to the third gear circuit and the
transmission is changed to third gear.
▶ 3-4 shift valve
The 3-4 shift valve is a two position valve. It
is used for all 3-4 and 4-3 gearshifts.
The switching of this valve is achieved by
S1 which is located at the end of the valve
spool.
During a 3-4 gearshift the 3-4 shift valve:
- Exhausts the front band release (B1R)
circuit thereby allowing the application of
the front band (B1).
- Connects the inner apply area of the front
servo (B1AI) to the Band Apply Feed
(BAF) circuit thus allowing greater apply
forces to the front band.
- Exhausts the Overrun Clutch (OC) circuit
which allows the C4 clutch to disengage.
During a 4-3 gearshift, the C4 clutch is
engaged and the front band (B1) is released.
These actions are sequenced by the 4-3
sequence valve.
The 3-4 shift valve also switches during 1-2
and 2-1 gearshifts where its function is to
apply the overrun clutch (C4) in second gear
but to release it in first gear.
Note that the C4 clutch is applied in Manual
1 by virtue of the manual valve and the 1-2
hift valve. Refer to "1-2 Shift Valve" in this
section.
01-23
3410-01
ION 4-SPEED
KYRON 2010.01