| 摘要 |
PURPOSE:To simplify the operation as well as raise operability, workability, and operating efficiency by a method in which an operating switch to vertically move a loader arm is set on the controller of the loader arm, and a lower limit position setter to set up the lower limit position during the lowering operation is provided. CONSTITUTION:A vehicular speed setter 16, a shovel angle setter 17, a lowering speed setter 18, and a lower limit position setter 5 are provided to an operating seat 15, and a position lever 19 to stop the lowering of a loader arm 2. When the lowering operation switch button 21 of an operating lever 18 is pushed, the oil pressure of a vertically movable cylinder 26 is discharged by the switch valve, a pressure control valve 41, a flow rate control valve 40, and a poppet valve 42 and the arm 2 is lowered by shortening. When the lever 19 is turned back and forth, the lower limit position of the arm 2 is set up and detected by an arm angle sensor, and the action is limitedly stopped by the valves 41 and 42 in such a way as to prevent the lowering of the arm 2 beyond the position. |
