Suction filters sit at the pump inlet and protect the pump from large particles, pressure filters sit downstream of the pump and protect sensitive valves and actuators, and return-line filters sit in the line back to the tank and capture wear debris and ingressed contamination before it recirculates. Each location has different pressure ratings, filtration fineness, and trade-offs, which is why most reliable hydraulic systems use more than one. Contamination is the leading cause of hydraulic component wear, and the filter you choose, and where you put it, determines how well your system fights it. A filter that works perfectly in one position can be a poor or even damaging choice in another. This guide explains how suction, pressure, and return-line filters differ, where each one fits, and how to decide which your system needs.
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