PROBLEM TO BE SOLVED: To achieve an operation mode in which a working machine is lifted to a position where a collision of the working machine with a vehicle machine is reliably prevented in lifting operation of an automatic lifting and lowering operation member in addition to an operation mode of lifting the working machine to a position arbitrarily set by the lifting operation of the automatic lifting and lowering operation member.SOLUTION: A main control device has a basic lifting control mode for using an arbitrary lifting position set by a lifting position setting member as a target value and an individual lifting control mode for using an individual lifting position of a connected working machine as a target value in automatic lifting control for controlling the operation of a lifting and lowering actuator by using a prescribed lifting position as a target value in lifting operation of an automatic lifting and lowering operation member. The basic lifting control mode and the individual lifting control mode can be selectively activated.COPYRIGHT: (C)2015,JPO&INPIT【課題】自動昇降操作部材の上げ操作によって任意に設定し得る位置まで作業機を上昇させる操作態様に加えて、自動昇降操作部材の上げ操作の際に作業機の前記車輌本機への衝突が確実に防止される位置まで前記作業機を上昇させる操作態様を可能とする。【解決手段】メイン制御装置は、自動昇降操作部材の上げ操作時に所定の上げ位置を目標値として昇降アクチュエータの作動制御を行う自動上昇制御として、上げ位置設定部材によって設定される任意上げ位置を目標値とする基本上昇制御モードと連結されている作業機の個別上げ位置を目標値とする個別上昇制御モードとを有している。前記基本上昇制御モード及び前記個別上昇制御モードは選択的に起動可能とされている。【選択図】図2
