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The function of hydraulic transmission system: 1. Use liquid to convert mechanical energy into hydraulic pressure energy, which is the power factor in hydraulic transmission; 2. Convert the hydraulic energy of the liquid into mechanical energy, which reacts with the action of the power component; 3. Adjust the speed of the hydraulic motor steplessly as needed, and adjust and control the pressure, flow rate, and flow direction of the working fluid in the hydraulic system. The hydraulic system is mainly composed of five parts: power components, actuator components, control components, auxiliary components, and working medium. The auxiliary components include pressure gauges, oil filters, energy storage devices, coolers, various pipe joints of pipe fittings, high-pressure ball valves, quick change joints, hose assemblies, pressure measuring joints, pipe clamps, and oil tanks; The working medium refers to the hydraulic oil or emulsion in various hydraulic transmissions, which undergoes energy conversion through oil pumps and hydraulic motors.