Every minute, approximately one million particles that are larger than 1 micron (0.001 mm or 1 μm) can enter a hydraulic system. These particles can cause damage to hydraulic system components because hydraulic oil is easily contaminated. The wear of hydraulic system components is dependent on this contamination, and the existence of metal parts in hydraulic system oil (iron and copper are particularly powerful catalysts) accelerates its degradation.
Hydraulic filters remove dirt and particles from fluid in a hydraulic system.
A hydraulic filter helps to remove these particles and clean the oil on a continuous basis. The performance for every hydraulic filter is measured by its contamination removal efficiency, i.e. high dirt-holding capacities. Almost every hydraulic system contains more than one hydraulic filter.