| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem with a conventional hydraulic control device that the specified amount of a hydraulic fluid is led continuously to a fixed throttle installed in a preference flow path to generate a pilot pressure for driving a directional control valve even when a steering operation is not performed. SOLUTION: This hydraulic control device for feeding the hydraulic fluid to the preference flow path for steering a drive part S and an excess flow path 2 for a load handling drive part N comprises a load-sensing type flow- dividing valve 4 installed in the flow path for the hydraulic fluid from a pump port 10, an unload part 6 installed in a flow path 5 between the flow dividing valve 4 and an excess flow port 11, and a back pressure regulating valve 7 installed at the end of the excess flow path 2. Thus, when the steering operation is not performed, all the amount of the hydraulic fluid can be fed to the load handling drive part N. |
