1 A pressure test machine calibration of single-action self-locking hydraulic jack, the jack installed in the test machine at the geometric center of the platen, start making simple jack test machine, the lower platen is raised about 50mm, to eliminate the influence of thin jack jack weight, Then, the test machine dial indicator readings zero. 2 jack piston rises around 100mm, then the test machine platens moved closer jack piston, officially entered the calibration status. 3 check the direction of the piston of the jack should be consistent with the actual work of the steering wheel, according to the actual work, the available jack test machine (active check) or test machine pressure jack (passive check. Jack when using the fuel supply, into the oil should Slow 1. large tonnage jack high temperature paint, surface corrosion and impact .2 its dust ring is designed to extend the life of large tonnage jack .3 piston guide inside cover position welding copper, never pull cylinder jack, Strong wear .4 large tonnage jack tank line is grinding, hard chrome-plated piston rod, large tonnage jack to prevent scratches and corrosion. thin jack _ Lu Hydraulic (certified) by the Texas _ Lu, Haidian jack Hydraulic machine a plant to provide. Texas Lu force hydraulic machinery plant (www.luliyeya.com) is an industry leader in Shandong Dezhou, hydraulic machinery and parts, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customers Demand in Shandong Hydraulic leadership with the staff warmly welcome all inquiries negotiations to create Lu Hydraulic better future.