Introduction (1)General tractor. (2)Garden tractor. (3)Row crop tractor. (4)Special purpose tractor. 2.2.2 Classification by walking device: (1)Crawler tractor (2)Wheeled tractor (3)Walking tractor (4)Boat tractor 2.2.3 Classification by Power Size (1)Over 100 horsepower-large tractor. (2)20-100 horsepower-middle tractor. (3)Below 20 horsepower-small tractor. Automobile and Tractor Northwest A&F University Automobile and Tractor Northwest A&F University Introduction (1) General tractor. (2) Garden tractor. (3) Row crop tractor. (4) Special purpose tractor. 2.2.2 Classification by walking device : (1) Crawler tractor (2) Wheeled tractor (3) Walking tractor (4) Boat tractor 2.2.3 Classification by Power Size : (1) Over 100 horsepower – large tractor. (2) 20-100 horsepower – middle tractor. (3) Below 20 horsepower – small tractor