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

The primary purpose of hydraulic fluid in a system is to transmit power. In hydraulic systems, the fluid serves as a medium that transfers energy from one part of the system to another. When pressure is applied to the hydraulic fluid, it allows for the movement of components such as pistons, motors, and cylinders, effectively converting hydraulic energy into mechanical energy. This capability is essential for the operation of various machines and equipment that rely on hydraulic systems, such as excavators, forklifts, and brakes in vehicles.

While hydraulic fluid does also play roles in lubrication, maintaining temperature, and filtering contaminants, these functions are secondary to its main role of energy transmission. Lubrication helps reduce wear and friction on moving parts, temperature regulation ensures the fluid remains within operational limits, and filtration helps maintain fluid quality by removing particles. However, without the fluid's ability to transmit power, the hydraulic system would not be able to perform its intended functions.