Kubota WSM L3540-II, Руководство по ремонту, Страница: 238 / 672

TRANSMISSION L3540-II, L4240-II, L5040-II, L5240-II, L5740-II , WSM
3-M38
(Continued)
1. The swashplate on the motor side is changed to the Lo side (The lamp of the turtle lights up and the rabbit lamp
goes off).
2. At the same time, the swashplate on the pump side is inclined toward the speed increasing side (To achieve
smooth shift transmission).
3. Even when the position of the swashplate on the motor side is changed toward the Lo side but a balance between
the load and engine torque cannot be achieved, the ECU controls the proportional control valve so that the engine
torque and loads on the HST are balanced, activates the servo piston and moves the swashplate on the pump
side to the neutral side. As a result, the loads applied on the pump are decreased more and reduces the load on
the engine. This increases the engine speed and prevents an engine stall.
* When the pedal is kept at the same position, the load is decreased and engine speed is increased again. In this
state, signals are being continuously transmitted from the engine speed sensor to the ECU. Then the signals are sent
from the ECU to the proportional control valve and the Hi-Lo solenoid valve. (4) As a result, the swashplate on the
pump side returns to its original position (before speed reduction). (5) The position of the swashplate on the motor
side is also automatically changed toward the Hi side. (The pump and motor move in almost the same manner as
shown in the illustration 4.)
* When the Hi-Lo lever is manually set at "Lo" position, the setting is not automatically changed to the Hi side even
if the AUTO H-DS function is set to "ON" .
9Y1211167TRM0045US0
[I] Stage 9

Stall Guard on and the PTO is engaged (Stall Guard PLUS)
[Tractor Condition]
Stall-Guard: ON
Hydro Dual Speed: ON
PTO Switch: ON
1. By the load of the PTO, the engine revolution number goes down.
2. When the engine revolution goes down, the ECU will send the message to return the Pump Swashplate to the
neutral position.
3. At the Stall Guard PLUS, compared with at the Stall Guard, the Pump Swashplate is set in such a way as to
quickly return to the neutral position.
4. On the other hand, when the engine revolution recovers, the Pump Swashplate is set in such a way as to slowly
return.
5. The setting is in such a way as the PTO work can be done at the engine revolution of 2000 or higher even when
the PTO load is applied at the maximum engine revolution. (At the time of depressing the pedal.)
6. Because the stable engine revolution has priority, the response-dial is not operable for adjustment.
9Y1211167TRM0046US0
KiSC issued 02, 2015 A