Kubota WSM L3560, Руководство по ремонту, Страница: 311 / 801

TRANSMISSION
L3560, L4060, L4760, L5060, L5460, L6060, WSM
3-M35
(Continued)
With loads 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. Since the engine
stall prevention function starts to operate first, the ECU controls the proportional control valve according to signals
from the engine speed sensor and accelerator opening sensor so that the engine torque and loads on the HST should
keep well-balanced relation. Loads applied on the engine are controlled by returning the swashplate on the pump side
toward the neutral side. When the loads cannot be controlled just by returning the swashplate on the pump side
toward the neutral side and the engine speed is decreased more, the Hi-Lo solenoid valve is closed by signals from
the ECU (Lo position). Then the position of the two-speed change spool is changed by the force of a spring to the
position shown in the drawing. Then oil between
"A"
and
"C"
(Forward and high pressure side) passes through the
two-speed change spool and is guided by the piston on the Lo side, and the position of the swashplate on the motor
side is changed to the Lo side (the inclination angle becomes larger).
9Y1210824TRM0038US0
KiSC issued 03, 2016 A