1. The hydraulic system of the excavator consists of a total of 5 parts.

2. The energy device part. The device that converts mechanical energy into pressure energy of fluid generally refers to a hydraulic pump, if it is pneumatic, it is an air compressor, the power part;

3. Execution device part. A device that converts the pressure of a fluid into mechanical energy, generally referring to hydraulic cylinders and hydraulic motors;

4. Part of the control and adjustment device. Control and adjust the pressure, flow and flow direction of the fluid in the hydraulic system, such as relief valve, throttle valve, reversing valve, etc.;

5. Auxiliary device part. In addition to the above 3 items, such as fuel tank, filter, accumulator, etc.;

6. Transmission medium. A medium that transmits energy.