What is the primary function of a hydraulic fluid in a hydraulic system?

The primary function of hydraulic fluid in a hydraulic system is to transmit power from one point to another. Hydraulic systems rely on the incompressibility of the fluid to efficiently transfer force through pressurized fluid within the system. When the fluid is pressurized, it can exert force on various components, allowing for movement and operation of machinery, such as hydraulic lifts, presses, and other tools.

The nature of hydraulic fluids enables them to move energy from the hydraulic pump to the actuators or cylinders that perform work. This capability makes hydraulic systems highly effective for lifting heavy loads and performing tasks that require significant force.

While other roles such as cooling and absorbing shock and vibration are important in specific contexts, they are secondary to the fluid's primary role in power transmission.