What is the main function of hydraulic fluid?

The main function of hydraulic fluid is to transmit power from the pump to the actuator. In hydraulic systems, fluid is pressurized in a pump and then moves through lines to actuators such as cylinders or motors, where it performs work. This transmission of power is essential for the operation of hydraulic machinery, as it allows forces to be applied over distances, enabling tasks such as lifting, pressing, and rotating to be accomplished efficiently.

While hydraulic fluid also provides lubrication to moving parts, seals clearances to minimize leakage, and carries heat and contaminants away from critical components to ensure system efficiency and longevity, its primary role in the context of operation is to facilitate the transfer of power. The ability of hydraulic fluid to efficiently transmit force is what makes hydraulic systems effective in various applications across industries.