The present invention manually by providing a height adjustment device of the lifting wheel of certainty adjustable become agricultural management unit to a predetermined position easily and quickly lifting wheel. A equipped with backward to the drive wheels of the rotary, in the management machine that was arranged the lifting wheel 5 for adjusting tillage forward depth, is Hai-gi in the lower fuselage, pivot provided with a pivot 10 to the plate surface The pivotally with a bracket 8 in which a plurality of locking holes 11 on the same circumference with a focus, the proximal end to the bracket pivot 10 provided with a pivot of the lifting loop at the distal end, the bracket engaging hole The through an arm 14 having a communicable possible transmembrane insertion hole 17 to 11, is pivotally supported a base end portion to the pivot 10, the tip is projected forward along the arm, the intermediate portion, an arm transmural insertion hole the operating rod 15 the front end portion is provided with a retractable key 16 that infested the bracket locking hole by a spring 19 which was biased in the direction of fitting the located haunt keys between the arms and the operating rod to the locking hole 11 Consisting of. .BACKGROUND【課題】手動によって容易且つ素早く昇降輪を所定位置に確実に調節可能となる農業用管理機の昇降輪の高さ調節装置を提供する。【解決手段】ロータリの後方に駆動輪を備え、前方に耕耘深さ調節用の昇降輪5を配設した管理機において、機体下部に配着し、板面に枢支部10を備えると共に枢支部を中心とした同一円周上に複数の係止孔11を設けたブラケット8と、先端部に昇降輪の枢支部を備えると共にブラケット枢支部10に基端部を枢支し、ブラケット係止孔11に連通可能な貫挿孔17を設けたアーム14と、基端部を枢支部10に枢支し、先端部をアームに沿って前方に突出させ、中間部に、アーム貫挿孔を貫通して先端部がブラケット係止孔に出没する出没キー16を備えた操作ロッド15と、アームと操作ロッドとの間にあり出没キーを係止孔11に嵌入する方向に付勢させたバネ19とから成る。【選択図】図3
