| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic system for long reach equipment, which is configured to facilitate switching of hydraulic equipment such as a relief valve when standard reach equipment is reassembled to the long reach equipment.SOLUTION: A relief valve 29 for long reach equipment is provided as a relief valve for a revolving motor of a slewing gear 2, ahead of the slewing gear 2 on a revolving super structure 3. A switching valve 34 for using a relief valve 28 for standard reach equipment and the relief valve 29 for long reach equipment for setting of operation limit pressure of the revolving motor in such a manner as to switch therebetween is provided on the revolving super structure 3. |
