wsm L503 Workshop Manual page 192

L3130 · L3430 · L3830 · L4630 · L5030, WSM
(B) GST Valve
GST Valve Assembly
The GST valve assembly is installed at the left side of
the transmission mid case. In the GST valve assembly,
many parts comprising the system are installed,
including the solenoid valves, shift pistons, shift check
valves, low-pass valve, proportional reducing valve,
clutch valve, check valves, sensor and switches. The
GST valve assembly functions as the central unit of the
GST system.
(1) GST Valve Assembly
(2) Clutch Valve
(3) Low-pass Valve
(4) Connector for Pressure
Switch
(5) Proportional Reducing Valve
Solenoid Valve
When the GST lever is operated, the solenoid valve
controls the flow of oil according to the gear shifting
operation.
When the solenoid is not excited, oil from regulating
valve flows to the shift piston through the surrounding of
the ball (10) in the valve. When the solenoid is excited,
plunger (9) presses the ball against the valve seat (11) to
open the unload passage (12), and drain the oil.
(1) Solenoid Valve 4
(2) Solenoid Valve 3
(3) Solenoid Valve 6
(Main Range Shift)
(4) Solenoid Valve 5
(Sub-range Shift)
(5) Solenoid Valve 2
(6) Solenoid Valve 1
(7) Coil
(8) Solenoid Valve
3-M18
TRANSMISSION
(6) Connector for Oil
Temperature Sensor
(7) Connector for Solenoid Valve
(8) Solenoid Valves
a : Oil From Regulating Valve
W1019626
(9) Plunger
(10) Ball
(11) Valve Seat
(12) Unload Passage
T : Drain Port
R : IN Port
P : To Shift Piston
W1019949
KiSC issued 02, 2007 A