PROBLEM TO BE SOLVED: To enable limp home operation (degeneracy operation) allowing a combine harvester to escape at least only from a field when abnormality in controlling means of a hydraulic stepless speed-changing mechanism for changing the power of an engine mounted on a traveling vehicle is caused.SOLUTION: The traveling vehicle includes the hydraulic stepless speed-changing mechanism for transmitting the power to right and left traveling parts, a straightly advancing operation device for operating the change of the straightly advancing speed of the traveling machine body 1, a turning operation device for operating the change of the advancing direction of the traveling machine body, electric actuators 272 and 270 for regulating the speed-changed output from the hydraulic stepless speed-changing mechanism, and the controlling means for driving the electric actuators 272 and 270 according to the operated amount of each operation device. Emergency manual operation devices 355 and 356 for manually operating the speed-changed outputs separately from the electric actuators 272 and 270 are installed in the hydraulic stepless speed-changing mechanism.COPYRIGHT: (C)2011,JPO&INPIT【課題】走行機体に搭載されたエンジンの動力を変速する油圧式無段変速機構の制御手段に異常が生じた場合に、圃場からだけでもコンバインを脱出させるようなリンプホーム運転(縮退運転)を実行出来るようにする。【解決手段】走行車両は、左右の走行部に伝達する油圧式無段変速機構と、走行機体1の直進速度を変更操作する直進操作具と、走行機体の進行方向を変更操作する旋回操作具と、油圧式無段変速機構の変速出力を調節する電気的アクチュエータ272,270と、各操作具の操作量に応じて電気的アクチュエータ272,270を駆動させる制御手段とを備える。油圧式無段変速機構には、その変速出力を電気的アクチュエータ272,270とは別個に手動操作するための緊急手動操作具355,356を設ける。【選択図】図15
