一台上海— 50型拖拉机带旋耕机作业，旋耕正常，行驶到田头转弯时旋耕机却提升不起来，但停车后把动力输出操纵手柄扳至“分离”位置，即使小油门也能较快升起。　　从现象看，在机组单独旋耕或单独提升时因所需动力较小，所以都很正常。只有在旋耕与提升同时进行时因所需动力 A Shanghai-50 tractor with rotary tiller operation, rotary normal farming, rotary tiller to drive when the field is not up, but the power output control handle after the parking to “disconnect” position, even if the small throttle Can rise faster. From the phenomenon of view, when the unit alone rotary or single upgrade due to the smaller power required, so are normal. Only when the rotary tillage and lifting at the same time because of the power needed