Which component removes contaminants from hydraulic fluids?

• A. Reservoir
• B. Filters (correct)
• C. Accumulator
• D. Manometer

Answer: (B)

Maintaining fluid cleanliness is essential in hydraulic systems because contaminants can cause abrasive wear, scoring, and premature failure of pumps, valves, and actuators. Filters remove contaminants from hydraulic fluids by trapping particles in a porous media as the fluid flows through. The filter media and micron rating determine which particle sizes are removed, and the filter continuously cleans the fluid during operation. When dirt accumulates, the pressure drop across the filter rises, signaling that it should be replaced or cleaned. Other components serve different roles: a reservoir stores fluid and provides space for gas to come out of solution; an accumulator stores energy by compressing gas; a manometer measures pressure. Since only a filter actively removes particulates from the fluid, it is the correct choice.