Kubota WSM L3560, Workshop Manual

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TRANSMISSION
L3560, L4060, L4760, L5060, L5460, L6060, WSM
3-M33
(Continued)
Since loads are applied on the motor shaft, the pressure between
"A"
and
"C"
is increased. With the pressure
between
"A"
and
"C"
increased, the pump receives more resistance, thereby decreasing the engine speed. The
engine stall prevention function is controlled by the engine speed sensor and accelerator opening sensor. Signals are
sent continuously from each sensor to the ECU all the time. The ECU controls the proportional control valve so that
the engine torque and loads on the HST keep well-balanced relation. (By controlling oil supply from the regulator by
the proportional control valve, the servo piston is moved toward the neutral direction. As a result, the swashplate on
the pump side moves toward the neutral direction. This decreases loads applied to the pump, resulting in the
decrease in loads applied to the motor. In this way, engine stall can be prevented.)
* When the pedal is kept at the same position, the load is decreased and engine speed is increased again. Since
signals are being transmitted continuously from the engine speed sensor to the ECU, the signals are sent from the
ECU to the proportional control valve. Thereby, more oil is supplied from the regulator to the servo piston. As a result,
the swashplate on the pump side returns to its original position (before speed reduction).
9Y1210824TRM0037US0
KiSC issued 03, 2016 A