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Keeping Fluid Clean in the Reservoir (.PDF Download)

The atmosphere surrounding a hydraulic system sometimes is underestimated as a source of dirt and moisture that can infiltrate hydraulic systems—usually through the reservoir breather. The oil level continually rises and falls as cylinders extend and retract, and system cycles occur. As the oil level rises, air pushes out of the reservoir, and as it drops, ambient air is drawn in through the breather.

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