Tractor hydraulic system is mainly used to lift and control agricultural machinery.

It is generally composed of a hydraulic tank, a hydraulic pump, a control valve, a hydraulic cylinder and a connecting pipeline. The hydraulic pump is responsible for pulling the hydraulic oil out of the tank and creating pressure. The control valve can adjust the flow direction and pressure of the hydraulic oil to control the action of the hydraulic cylinder. Hydraulic cylinder is the actuator, through the hydraulic oil to push the piston, to achieve the lifting of farm tools and other actions.

For example, when a mounted plow needs to be lifted, a hydraulic pump delivers hydraulic oil to a hydraulic cylinder, and a piston extends under the oil pressure to lift the plow. The hydraulic oil in the system also plays the role of lubrication and power transmission, and can buffer vibration to ensure the stable operation of the system.