| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic pressure control device of a dump truck capable of enhancing the operability. SOLUTION: The hydraulic pressure control device of the dump truck comprises a dump cylinder 8 for tilting a cargo bed 4, a hydraulic pump 10 driven by an engine via a power take-out device 9 to feed pressurized oil to the dump cylinder 8, and a directional control valve 11 provided between the hydraulic pump 10 and the dump cylinder 8 to control the flow of the pressurized oil; and further comprises an UP push switch 17 which indicates the upward operation at the first speed of the cargo bed 4 by the alternate operation to indicate the upward operation at the speed lower than the first speed of the cargo bed 4 by the momentary operation, a DOWN push switch 19 which indicates the downward operation at the second speed of the cargo bed 4 by the alternate operation to indicate the downward operation at the speed lower than the second speed of the cargo bed 4 by the momentary operation, and a controller 15 and an actuator 14 for performing the drive control of the directional control valve 11 according to the signals from the UP push switch 17 and the DOWN push switch 19. COPYRIGHT: (C)2009,JPO&INPIT
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