Kubota WSM L3540-II Workshop Manual page 211

L3540-II, L4240-II, L5040-II, L5240-II, L5740-II , WSM
[3] ELECTRICAL CONTROL SYSTEM
(1) Electrical Control
(2) Construction and Function of Components
• Refer to Workshop Manual of "TRACTOR MECHANISM" (code No. 9Y021-18200) for construction and function
of components
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
2
, 71 psi), the pressure switch becomes
(5 kgf/cm
"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.
NOTE
• By means of
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 kept at this state.
(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
3-M11
TRANSMISSION
speed increasing, speed
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
9Y1211167TRM0017US0
9Y1211167TRM0018US0
KiSC issued 02, 2015 A