What is the purpose of a hydraulic reservoir?

The purpose of a hydraulic reservoir is to store and supply hydraulic fluid, making this the correct choice. Hydraulic systems rely on fluid to transmit power and maintain system operation. The reservoir serves as a storage unit where excess hydraulic fluid can accumulate, allowing for consistent flow and pressure throughout the system. It also accommodates thermal expansion of the fluid, ensuring that the hydraulic system can operate efficiently regardless of temperature fluctuations.

In addition to storage, the reservoir can help facilitate the separation of air and contaminants from the hydraulic fluid, contributing to the overall health and performance of the hydraulic system. However, the primary role of the reservoir is indeed to store and supply the hydraulic fluid necessary for system operation.