The function of the hydraulic filter is to filter various impurities in the hydraulic system. Its sources are mainly mechanical impurities that remain in the hydraulic system after cleaning, such as scale, casting sand, welding slag, iron filings, paint, paint and cotton yarn scraps, etc., and impurities that enter the hydraulic system from the outside, such as through the fuel filler and anti-corrosion equipment. Dust entering the dust ring, etc.; impurities generated during the working process, such as the fragments formed by the hydraulic pressure of the seal, the metal powder generated by the relative wear of the movement, and the gum, asphaltene, and carbon residue generated by the oil due to oxidative deterioration.

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