Hydraulic filters are mainly installed on the suction oilway, oil pressure pipeline , return oilway, and bypass system.effectively used for removing particles and rubber impurities from the hydraulic system, providing a raised cleanness in hydraulic systems to ensure accurate operation of the systems and prolonged service life of the accessories, and to reduce hydraulic system’s downtime and hence improve the performance of the system , also helps in reducing component repair cost of the system. It plays important role in protecting a hydraulic system. Hydraulic filters are made by single layer or multi-layer metal mesh and filter material, layer number and wire mesh are different according to conditions of use and purpose.