Tractor A self-propelled engine used to pull and drive working machinery to complete various mobile operations. Can also do fixed work power. It is composed of engine, transmission, walking, steering, hydraulic suspension, power output, electrical instruments, driving control and traction systems or devices. The engine power is transmitted from the transmission system to the driving wheel to make the tractor run. In real life, it is common to use the rubber belt as the medium of power transmission. Agricultural, industrial and special purpose tractors according to function and use; According to the structure type of wheel, crawler, boat tractor and self-propelled chassis