... ruffled, deep drawing, etc.Cartridge valve equipped for hydraulic control system, reliable, durable and less hydraulic shock, with ... 3. The new machine use a week later, check on the degree of oil contamination, the solid ... 16. Use three months later, then conduct a check. Once every six months to replace oil. ... 25mm. 4.1.5. Every half an year check pressure gauge, every year clean the hydraulic station ...