a. When load on main pump is lightlf there is a failure in the governor, pump controller, turn TVC prolix svvitch ON to svvitch to the resistor side. In this case, the power source is taken directly from the bat- tery. But if the current is used as it is, it is too large, so use the resistor to control the current flowing to solenoid (1)ẵ When this is done, the current becomes con- stant, so the force pushing solenoid push pin (11) is also constant.• lf main pump pressures Pa1 and Pa2 are low, the combined force of the pump pres- sure and the force of solenoid (1) is vveaker than the spring set force, so piston (2) is baíanced at a position to the right.At this point, port c is connected to the drain pressure of port d, and the large piston di- ameter end of servo piston (9) also becomes the drain pressure PT through the LS valve. When this happens, the pressure at the small piston diameter end is large, so servo piston (9) moves in the direction to make the dis- charge amount larger.
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