PROBLEM TO BE SOLVED: To improve reaping work efficiency in a combined harvester and thresher provided with a travel side HST including a travel pump and a travel motor both of which are variable displacement type.SOLUTION: This combined harvester and thresher is constructed to include a small displacement control mode changing output of the travel side HST according to an operation position of a speed change operation member under a condition where the travel motor is shifted to or is maintained in a small displacement state, a large displacement control mode changing output of the travel side HST according to the operation position of the speed change operation member under a condition where the travel motor is shifted to or is maintained in a large displacement state, and a shift control mode changing a displacement state of the travel pump not to change output of the travel side HST in displacement state change of the travel motor, and to select the small displacement control mode when the combine is under a working condition.COPYRIGHT: (C)2008,JPO&INPIT【課題】双方が可変容積型とされた走行ポンプ及び走行モータを有する走行側HSTを備えたコンバインにおいて、刈取作業効率を向上させる。【解決手段】走行モータを小容積状態に移行又は保持した状態で走行側HSTの出力を変速操作部材の操作位置に応じて変化させる小容積制御モードと、走行モータを大容積状態に移行又は保持した状態で走行側HSTの出力を変速操作部材の操作位置に応じて変化させる大容積制御モードと、走行モータの容積状態変更時に走行側HSTの出力が変化しないように走行ポンプの容積状態を変更させる移行制御モードとを含み、コンバインが作業状態の際には小容積制御モードが選択されるように構成する。【選択図】図9
