PROBLEM TO BE SOLVED: To implement a work in a field in a curved motion state.SOLUTION: A clutch connection mechanism C comprises clutch connection switch means S1 for switching a state of a work clutch mechanism 48 between a state in which the work clutch mechanism is linked to a put-on state or a cut-off state on the basis of operation of an operation lever 56, and a state in which the put-on state of the clutch is held even when the operation lever 56 is operated to the other side, a differential lock mechanism 41 is made in a differential lock release state, and the state of the work clutch mechanism 48 is linked to the put-on state. A differential lock connection mechanism D comprises differential lock connection switch means S2 for switching a state of the differential lock mechanism 41 between a state in which the differential lock mechanism 41 is in a differential lock state or the differential lock release state on the basis of the operation of the operation lever 56, and a state in which the differential lock release state is held even when the operation lever 56 is operated to one side, and the work clutch mechanism 48 is in the put-on state in the differential lock release state.SELECTED DRAWING: Figure 7COPYRIGHT: (C)2017,JPO&INPIT【課題】圃場での曲進状態での作業を具現化しようとする。【解決手段】クラッチ連繋機構Cに、前記操作レバー56の操作に基づき作業クラッチ機構48を入り又は切りに連動する状態と操作レバー56が前記他方側へ操作されてもクラッチ入りを保持し、デフロック機構41をデフロック解除状態とし作業クラッチ機構48をクラッチ入りに連動する状態に切り替えるクラッチ連繋切替手段S1を設ける。また、デフロック連繋機構Dに、前記操作レバー56の操作に基づきデフロック機構41をデフロック状態又はデフロック解除とする状態と、操作レバー56が前記一方側へ操作されてもデフロック解除状態を保持してデフロック解除状態・作業クラッチ機構48をクラッチ入りとする状態とに切り替えるデフロック連繋切替手段S2を備える。【選択図】図7
