| 摘要 |
PROBLEM TO BE SOLVED: To safely execute work by functioning outriggers as essential auxiliary vehicle-supporting means. SOLUTION: The crawler work vehicle has the plurality of outriggers which are longitudinally extensible and contractible by respective outrigger cylinders 20, 20, etc. and grounded in an extended position to support a vehicle body. In a hydraulic circuit including the outrigger cylinders 20, 20, etc., a main relief valve 48 is arranged in a pump line 30, an outrigger relief valve 49 is arranged in a cylinder extended-side main pipe line 28, respectively. Then the set pressure of the relief valve 49 is set to a value at which the vehicle body cannot be lifted with the outriggers kept grounded. COPYRIGHT: (C)2007,JPO&INPIT
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