| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a working machine whose lower travelling body is equipped with four or more travelling units freely vertical-position adjustable, and which improves its travelling stability while maintaining its operability and occupant comfort during working. <P>SOLUTION: The working machine includes suspension mechanisms 91-93, and suspension mechanism operation changeover means 94, 97, 102. During travelling, a suspension mechanism operation ON/OFF switch 97 is turned on so that the suspension mechanisms automatically ground crawler units 224a, thus improving travelling stability. During front working, the suspension mechanism operation ON/OFF switch is turned off to cut off pilot pressure on pilot check valves 92a, 93a so that the pilot check valves 92a, 93a does not permit the flow of the pressure oil from an accumulator 91a to make the suspension mechanisms inoperative, thus maintaining operability and occupant comfort during front working. <P>COPYRIGHT: (C)2012,JPO&INPIT |
