3-M14
L3130 · L3430 · L3830 · L4630 · L5030, WSM
TRANSMISSION
(2) Electrical Control
An electrical control of GST system is as follows.
1. Shift the GST lever and shuttle lever to desired
position.
2. The output voltage of selected gear shift position is
output to microcomputer of the ECU by lever sensor.
3. The ECU detects the gear shift position with GST
lever sensor and shuttle switch, and excites various
solenoid valves in accordance with selected position.
4. When the desired solenoid is excited, oil is sent to the
desired shift piston.
5. A pressure in the circuit is raised because the
movement of shift piston shuts the shift check pin.
When the pressure in the circuit reaches 0.49 MPa (5
kgf/cm
2
, 71 psi), the pressure switch becomes ON.
6. By means of the pressure switch’s ON, the ECU
detects the present condition (traveling speed, engine
speed and oil temperature) from various sensors, and
pressure in the hydraulic clutch is raised according to
the respective condition.
• By means of speed increasing, speed decreasing,
traveling speed, engine speed and oil
temperature, the indicated pressure period from c
to d is controlled at appropriate pressure
respectively.
7. A pressurizing to hydraulic clutch has been done until
it reaches the system pressure, and pressure in the
clutch is maintained at this state.
W1016324
(1) Oil Temperature Sensor
(2) Engine Tachometer Sensor
(3) Traveling Speed Sensor
(4) Shuttle Switch
(5) Pressure Switch
(6) Shift Piston
(7) Clutch Valve
(8) GST Lever Sensor
(9) ECU
(10) Solenoid Valves
(11) Proportional Reducing Valve
P : Pressure
H : Time
a : Starting of clutch engaging
b : Low-pas pressure
c : Starting of pressurized
c to d :Specified pressure from
ECU
e : Gear shifting completion
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