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随着拖拉机功率的增长(在整机尺寸和额定牵引力基本不变的条件下)和大功率拖拉机的增加,目前世界各国拖拉机大中小的划分随发展年限与不同国家的使用要求不同变化甚大。在这方面我们所谓的中等马力是指40～100马力这样一个较大范围的拖拉机,在这一功率范围内的农用拖拉机大部分又是用轮式拖拉机作为基本型。功率范围的划分又与零部件的通用化、系列化有着密切的关系。
With the increase of tractor power (under the condition of the same machine size and rated traction) and the increase of high-power tractors, the division of large, medium and small tractors in various countries in the world varies greatly with the development years and the requirements of different countries. In this respect, the so-called medium horsepower refers to a large-scale tractor of 40 to 100 horsepower, and most of the agricultural tractors in this power range use the wheeled tractor as the basic type. The division of power range and components of the universal, serialization has a close relationship.