PROBLEM TO BE SOLVED: To provide a vehicle body height-adjusting structure of a walking type working machine, which can stably do works in a prescribed working depth in spite of a field having a shallow surface soil layer and a field having a deep surface soil layer without causing the increase in the size, weight and cost of a vehicle body.SOLUTION: There is provided the vehicle body height-adjusting structure of the walking type working machine, which has a transmission case 5 upward or downward shaken on a lateral axis center P1 as a support point, and an operation mechanism E for upward or downward shaking the transmission case 5 on the axis center P1 as a support point within a preliminarily set shaking range, and in which a vehicle body height-adjusting mechanism F for changing the vehicle body height of a driving wheel 6 disposed in the free end portion of the transmission case 5 to adjust the ground height of the vehicle body comprises the transmission case 5 and the operation mechanism E, characterized by disposing a shaking range-changing means G capable of changing the setting of the shaking range in the vehicle body height-adjusting mechanism F.COPYRIGHT: (C)2010,JPO&INPIT【課題】車体の大型化や重量化及びコストの高騰などを招くことなく、作土層の浅い圃場と作土層の深い圃場とにかかわらず、所定の作業深さで作業を安定して行えるようにする。【解決手段】左右向きの軸心P1を支点にして上下揺動する伝動ケース5と、伝動ケース5を予め設定した揺動範囲で軸心P1を支点にして上下方向に揺動操作する操作機構Eとを備え、伝動ケース5と操作機構Eとから、伝動ケース5の遊端部に備えた推進車輪6の対車体高さを変更することにより車体の対地高さを調節する車体高さ調節機構Fを構成してある歩行作業機の車体高さ調節構造において、車体高さ調節機構Fに、揺動範囲の設定変更を可能にする揺動範囲変更手段Gを備える。【選択図】図24
