| 摘要 |
PROBLEM TO BE SOLVED: To perform traveling operation without releasing hands from a work operation lever during work operation. SOLUTION: Either of output pressure of traveling operation remote control valves 26 and 36 and output pressure of solenoid proportional valves 28, 29, 38, and 39 to regulate pilot pressure from a hydraulic source 27 is selected as high pressure by shuttle valves 24, 25, 34, and 35 for switching spools of control valves 23 and 33 to control hydraulic motors 21 and 31. While an operator operates the work operation levers 13 and 14, switches 19 and 20 provided on grips can be operated to make traveling operation without releasing hands from the work operation levers 13 and 14. COPYRIGHT: (C)2004,JPO
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