| 摘要 |
PROBLEM TO BE SOLVED: To maintain satisfactory maintenance property of piping, improve the durability, and protect hydraulic piping by a simple configuration in a boom structure of a turning work vehicle provided with a work machine having a boom attached to a turning body constituted so as to turn it freely and an arm attached to the boom so as to turn freely. SOLUTION: An assembly type protective cylinder 41 for hydraulic hose is inserted and provided into the boom 6, a hydraulic hose take-out port 46 is provided between a support bracket 45 in a terminal part of an arm cylinder on a rear surface of the boom 6 and it, a mounting seat of a locking device 43 for hydraulic hose protective cylinder is provided in the take-out port, and the hydraulic hose from the hydraulic hose take-out port on the rear surface of the boom to a bucket cylinder or a protective cover 47 for PTO piping is provided between the hose take-out port on the rear surface of the boom and the tip of the boom.
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