Which component is most often used to ensure that the hydraulic system's fluid is free from foam?

The reservoir plays a crucial role in maintaining the hydraulic system's fluid integrity, particularly in preventing the presence of foam. One of its primary functions is to provide a space where hydraulic fluid can expand, allowing any entrained air bubbles to rise to the surface and escape. This process is essential because foam can significantly reduce the efficiency of the hydraulic system, leading to erratic actuator behavior and potential system failure.

Additionally, the design of the reservoir often includes features such as baffles to further assist in separating air from the fluid. By helping to eliminate foam, the reservoir ensures that the hydraulic fluid remains stable and effective under various operating conditions, supporting the overall reliability and performance of the hydraulic system.