Repair process: 1, with oxygen - acetylene flame grilled scratched site (control temperature, Yulin cylinders, avoid surface annealing), the annual oil infiltration metal surface baked, grilled to no sparks. 2, will scratch the surface treatment area with angle grinder, grinding depth 1 mm or more, and polished grooves along the rail, preferably dovetail. Drilling deeper scratches ends, change the forces. 3, with cotton wool dipped in acetone or ethanol to clean the surface. Reasons hydraulic hydraulic oil appears dirty or rusty simultaneously mixed with a water, hydraulic oil appears dirty or rusty ① simultaneously mixed with water at the same time to check whether the oil water system, if there is, the push mechanism described V-ring may be damaged. Time to replace the V-ring. ② check the fuel tank filler neck is not covered into the water and other contaminants. If it is then filtered to remove water and hydraulic oil and fuel tank filler cover. ③ Check the hydraulic system components ministries, whether because they damage caused by oil pollution. Second, the master cylinder piston rod vibration due to work ① Check whether the oil level is too low, the pump intake air caused by the hydraulic cylinder piston crawl. At this point you need to refuel to the specified oil level. ② Check the main pump inlet system for leaks. ③ Check whether the push mechanism V-ring compression tight three high oil temperature ① Check the main relief valve is defective and often overflow. ② Check the auxiliary electro-hydraulic valves, unloading valves are in particular trouble. Because they will dispense valve pump unloading time is reduced faulty electric hydraulic jack cylinder, often in high-load operation. Then the need to exclude two valve failure. ③ replaced as hydraulic oil, need to check the oil viscosity is too low, non-standard fuel tank, oil pump consume too much internal leakage. Fourth, the two push piston action does not synchronize the two push hydraulic cylinder piston movement is not synchronized, in the suction stroke of the piston speed, the first to reach the stroke end, and sometimes collided cylinder phenomenon, you can hear the piston and the cylinder head crash, this is generally due to the close passage of air and causing memory. Thin hydraulic cylinder, Lu Hydraulic (online consultation), provided by the Texas Lu Yulin cylinders hydraulic equipment factory. 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 customer needs. Lu Hydraulic leadership with the staff warmly welcome all inquiries negotiations to create Lu Hydraulic better future.