PROBLEM TO BE SOLVED: To stop surely a traveling vehicle body, and to reduce damage of an implement, in comparison with a conventional constitution in which reverse rotation is sometimes transmitted erroneously to the implement.SOLUTION: Such control is carried out that when a main speed change lever (17) is moved to a neutral position, pressure extraction control of a hydraulic stepless speed variator (31) is executed, and that power is prevented from being transmitted to an implement (3) during the pressure extraction control. Thereby, a traveling vehicle body can be stopped surely, and damage on the implement (3) can be reduced in comparison with a conventional constitution in which reverse rotation is sometimes transmitted erroneously to the implement (3).SELECTED DRAWING: Figure 11COPYRIGHT: (C)2019,JPO&INPIT【課題】誤って作業機に逆回転が伝達されることがある従来の構成に比べて、走行車体を確実に停止させるとともに、作業機の破損を低減すること。【解決手段】主変速レバー(17)が中立位置に移動した場合に油圧式無段変速装置(31)の圧抜き制御を実施し且つ圧抜き制御中に作業機(3)に動力を伝達しないように制御することで、誤って作業機(3)に逆回転が伝達されることがある従来の構成に比べて、走行車体を確実に停止させるとともに、作業機(3)の破損を低減することができる。【選択図】図11
