Most contaminants enter the hydraulic system through which component?

The reservoir is a critical component in a hydraulic system, and it serves as the primary storage area for hydraulic fluid. Because the reservoir is exposed to the open environment, it is often the main entry point for contaminants such as dirt, dust, moisture, and other foreign particles. Over time, these contaminants can accumulate and negatively impact the performance and efficiency of the hydraulic system.

Proper maintenance of the reservoir, including regular inspections and cleaning, is essential to minimize contamination. The design of the reservoir often includes features to help reduce the ingress of contaminants, but some will inevitably find their way in. This makes the reservoir a focal point in maintaining hydraulic fluid cleanliness and system integrity. In contrast, while valves, filters, and dipsticks play important roles in the functionality and maintenance of hydraulic systems, they are not typically the initial entry points for contaminants. Filters, for example, function to remove impurities already present in the fluid rather than being a source of contaminants themselves.