| 摘要 |
PROBLEM TO BE SOLVED: To enhance stability of support of a boom by a boom bearer while reducing the size, weight and cost of the boom bearer; and to dispense with a complicated positioning operation. SOLUTION: A body 14 of the boom bearer 13 is provided with a hook-like engaging body 20; and a horizontal attachment pin 27 is provided on an outer surface of a crawler frame 1b of a lower structure 1. In assembly/disassembly, the engaging body 20 is engaged with the attachment pin 27 from above; and the bearer body 14 is detachably attached to the crawler frame 1b. The bearer body 14 has a cylinder retainer portion 18 provided at an upper end; and a boom cylinder 9 is supported by the cylinder retainer portion 18 so as to support the boom. COPYRIGHT: (C)2011,JPO&INPIT
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