手扶拖拉机是农田作业和农村运输的常用农业机械,在农业生产和农村经济发展中具有重要作用。手扶拖拉机作业环境通常比较恶劣,使用过程中由于磨损、松动等原因,一些零部件可能会降低或完全丧失工作能力,同时燃油、润滑油、冷却水等随着使用时间的延长,会逐渐减少和变质,因而需 Walking tractors are commonly used agricultural machinery for farmland operations and rural transport and play an important role in agricultural production and rural economic development. Walking tractor operating environment is usually harsh, due to wear and tear during use, some components may reduce or completely lose their ability to work, while fuel, lubricants, cooling water, etc., as the use of time, will gradually reduce And metamorphosis, so need