SsangYong Rexton. Manual - part 535

AUTOMATIC TRANSMISSION  5A-11

SSANGYONG  Y200

HYDRAULIC CONTROL CIRCUIT

KAA5A08A

5A-12  AUTOMATIC TRANSMISSION

SSANGYONG  Y200

Manual Valve

The manual valve is connected to the vehicle selector
mechanism and controls the flow of oil to the forward
and reverse circuits. The manual valve function is
identical in all forward gear positions except that in
the Manual  1 position an additional supply of oil is
directed to the  1-2 shift valve for application of the
rear band and the C4 overrun clutch. The manual valve
directs the line pressure into the PRND fluid circuits.

Valve Body

1-2 Shift    Valve

The 1-2 shift valve is a two position valve that must be
switched to the 2, 3 and 4 position in order to get any
forward gear other than first gear. It is used for all 1-2
and 2-1 gearshifts.

The switching of this valve is achieved by using S1
and/ or  S2.

During a 1-2 gearshift drive oil from the manual valve
passes through to the second gear circuit. During a 2-
1 gearshift the band apply feed oil is allowed to exhaust
via the 1-2 shift valve.

The 1-2 shift valve works in conjunction with the 3-4
shift valve to disengage the C4 clutch in first gear,
and  engage C4 in second gear. When Manual 1 is
selected the C4 clutch and rear band (B2) are engaged.

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 al-
lows the C4 clutch to disengage.

KAA5A090

KAA5A100

KAA5A110

KAA5A120

AUTOMATIC TRANSMISSION  5A-13

SSANGYONG  Y200

During a 4-3 gearshift, the C4 clutch is engaged and
the front band (B1) is released. These actions are se-
quenced 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 shift valve. Refer to
“1-2 Shift Valve” in this section.

4-3 Sequence Valve

The 4-3 sequence valve is a two position spring loaded
valve. It switches during 3-4 and 4-3 gearshifts although
it performs no function during the 3-4 shift.

During the 4-3 shift the 4-3 sequence valve delays the
connection of the Clutch Apply Feed (CAF) circuit to
the  B1R circuit until the B1R circuit has been fully
pressurized by using the third gear circuit. This
prevents objectionable engine flare on completion of
the 4-3 gearshift.

Solenoid Supply Pressure Regulator Valve

The solenoid supply pressure regulator valve supplies
a  constant pressure to all solenoids (S1 to S7). Line
pres-sure  is used as the feeding oil to this regulator
and the output is termed line 500.

Line Pressure Control Valve

Line pressure is controlled by S6, which acts as the

line pressure control valve. When S6 pressure is applied
to the end of the Primary Regulator Valve (PRV), it is
opposed by spring force and causes LOW line
pressure for light throttle application and cruising.

Heavy throttle application causes the normally open
S6  to open (switch Off) thus closing line 500 and
opening S6 to exhaust. Removal of S6 pressure from
the PRV results in HIGH line pressure.

Clutch Apply Feed Regulator Valve

The clutch apply feed regulator valve is a fixed ratio
(2.25:1) valve. This valve provides a regulated pressure
to the C1 clutch and controls the change rate of the
clutch state to give the desired shift quality.

Third gear oil supplied to the valve is regulated to pro-
vide an output pressure, Clutch Apply Feed (CAF) pres-
sure, of 2.25 times the S5 signal pressure when S3 is
ON. When S3 is OFF, the output pressure is 2.25 times
the line 500 pressure.

Band Apply Feed Regulator Valve

The band apply feed regulator valve is a fixed ratio
(1.4:1) valve. It provides a regulated pressure to the
front servo, and controls the change rate of the front
band (B1) state to give the desired shift quality.

Second gear oil supplied to the valve is regulated to
provide  an output pressure, Band Apply Feed (BAF)
pressure, of  1.4 times the S5 signal pressure when S4
is ON. When S4 is OFF the output pressure is 1.4 times
the line 500 pressure.

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KAA5A140

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5A-14  AUTOMATIC TRANSMISSION

SSANGYONG  Y200

Reverse Lockout Valve

The reverse lockout valve is a two position valve con-
tained in  the upper valve body. This valve uses S1-S2
pressure as a signal pressure and controls the applica-
tion of the rear band (B2).

While the manual valve is in D, 3, 2 or 1 positions,
drive  oil is applied to the spring end of the valve,
overriding any signal pressures and holding the valve
in the lockout  position. This prevents the application
of B2 in any of the forward driving gears except M1.

S1- S2 pressure is exhausted and the valve is held in
the lockout position  by the spring. In this position,
engagement of B2 is prohibited.

This feature protects the transmission from abuse by
preventing the undesirable application of B2 at high
speed, and by providing a reverse lockout function.

Note that if the transmission is in failure mode, the
rear band will be applied at all times in P, R and N.

Pump Cover

When the manual valve is in P, R or N positions, drive
oil is  exhausted and the reverse lockout valve may be
toggled by S1-S2 pressure.

B2 is applied in P, R, and N if the following conditions
are satisfied;

•

In P or N, vehicle speed = 3 km/h.

•

In R, vehicle speed = 10 km/h.

•

Engine speed = 1600 rpm.

•

Throttle position = 12 %.

Under these conditions, the TCM switches solenoids
S1 and S2 to OFF. The reverse lockout valve toggles
under the influence of the S1-S2 pressure, to connect
the line pressure to the B2 feed. Oil is fed to both the
inner and outer apply areas of the rear servo piston,
applying B2.

If any of the above conditions are not satisfied, the
TCM switches solenoids S1 and S2 to ON.

Primary  Regulator Valve

The Primary Regulator Valve (PRV) regulates the trans-
mission 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 applica-
tions 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 slip-
page.  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.

KAA5A170

KAA5A180

KAA5A190