| 摘要 |
PROBLEM TO BE SOLVED: To simplify pressure oil pipe passage arrangement to eliminate unevenness of operation speed of each outrigger. SOLUTION: This crawler crane 1 is provided with a crawler device 7 for hydraulic driving, a crane device 3, and an outrigger device 6. This crawler crane 1 is provided with a running-crane change-over switch 51 for switching running mode and crane mode, a crane operation-outrigger operation change-over switch 52 for switching crane operation mode and outrigger operation mode in crane mode, a change-over control valve for running for the crawler device, change-over control valves 21 to 24 of each hydraulic actuator 11, 12, 13, 14 for the crane device, outrigger cylinder change-over switches 53FL, 53FR, 53RL, 53RR, and a change-over control valve 25 for outrigger for simultaneously controlling outrigger cylinders 8FL, 8FR, 8RL, 8RR whose operation is selected. COPYRIGHT: (C)2005,JPO&NCIPI
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