| 摘要 |
A hydraulic pump displacement control apparatus for a working vehicle capable of reliably detecting the working vehicle under excavating operation and reducing loss in power is provided. For this purpose, the control apparatus includes a bottom pressure detector ( 45 ) for detecting a hydraulic pressure in a bottom side ( 13 A) of a cylinder ( 60 ) for operating a working machine ( 10 ), a displacement control device ( 41 ) for controlling a displacement of a variable displacement hydraulic pump ( 26 ), and a controller ( 50 ) which determines that an excavating operation starts when a predetermined time elapses with a detection value from the bottom pressure detector at a predetermined value or less and thereafter, the detection value exceeds the predetermined value, and outputs a displacement control signal to reduce the displacement of the hydraulic pump to a predetermined displacement that is smaller than the maximum displacement to the displacement control device.
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