Mattingly & Malur, PC
Work machine
A work machine is provided. The work machine includes a changeover valve capable of disabling area limiting control by bypassing an area limiting control solenoid proportional valve disposed in a pilot line through which pilot pressure generated by a hydraulic pilot type operation device is guided to a directional control valve and the work machine can perform the area limiting control while ensuring response of a work implement. When a first fluid temperature T1 is higher than a first predetermined temperature Ta and a control changeover switch 66 specifies disabling of the area limiting control, a controller brings a plurality of changeover valves into a bypass position. When the first fluid temperature T1 is equal to or lower than the first predetermined temperature Ta, the controller brings the changeover valves into a communication position and places the solenoid proportional valves in a fully open position.
HITACHI CONSTRUCTION MACHINERY CO., LTD.
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F15B F15B F15B F15B E02F F15B E02F E02F F15B E02F F15B F15B E02F E02F E02F E02F E02F E02F E02F F15B
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Takaaki Hiroyuki
Chiba Yamada