PROBLEM TO BE SOLVED: To constitute an adjusting mechanism capable of adjusting the reaping height, to be simple.SOLUTION: A front wheel transmission case 16 with a front wheel 1 supported to the front end is supported to the front position of a traveling machine body so as to be swingable around a support axis Q. A switching operation part F provided for holding the swinging attitude of the front wheel transmission case 16 includes an engaging plate 82 formed with a plurality of engaging holes 82A a locking member 84 engaged into the engaging hole 82A by the energizing force of a locking spring 85 and a lock release wire 86 operated in a direction to separate the locking member 84 from the engaging hole 82A.COPYRIGHT: (C)2013,JPO&INPIT【課題】刈り高さの調節が可能な調節機構を簡便に構成する。【解決手段】前端に前輪1が支持された前輪伝動ケース16が走行機体の前部位置に支持軸芯Qを中心にして揺動自在に支持され、この前輪伝動ケース16の揺動姿勢を保持する切換操作部Fを備えた。この切換操作部Fが、複数の係合孔82Aが形成された係合板82と、係合孔82Aに対してロックバネ85の付勢力で係入するロック部材84と、このロック部材84を係合孔82Aから分離させる方向に操作するロック解除ワイヤ86を備えて構成した。【選択図】図10
