| 摘要 |
<p>PURPOSE:To prevent the occurrence of trouble with concurrent operations of traveling motor and other actuators by a method in which a solenoid valve to be operated by interlocking with switching of left and right-handed traveling valves is provided and oil paths for slewing valve and operating actuator are switched. CONSTITUTION:Left and right-handed traveling motors 2 and 3 are set in tandem on the uppermost side of groups A and B, and a solenoid valve 18 is provided for an electric circuit 17 to be operated by interlocking with switching operations of the motors 2 and 3. Valves 19 and 20 are also provided for oil paths 26 and 27 branched at the middle of an oil path 25 for the third pump 9 and a slewing valve 11. The valve 19 is switched to a closing position by pilot pressures from the valve 11 and remote control valves 22-24 for operating attachment, and the valve 20 is switched to an opening position by pressure oils from the valves 22-24. Pressure oils from the first and second pumps 7 and 8 can thus be supplied to the motors 2 and 3, and pressure oil from the pump 9 can be supplied to the slewing motor 11 and the actuators 4-6.</p> |
