If the fuel tank vent valve is set, you can look at pipe joints loose, and then a few more times to exhaust action. But pay attention to the injection, if the cylinder pressure joints, the selection pressure joints are more secure because it is easy to operate, in general, the best in the high Lu exhaust cylinder power, this effect is better. If neither of the fuel tank, exhaust operation can be carried out, the specific operation is: let the piston movement in one direction, pause for some time, and then it moves to the other direction, then pause for some time the high-pressure cylinder so repeatedly, you can drain the air in the cylinder. Repair process: 1, with oxygen - acetylene flame grilled scratched parts (master temperature to avoid surface annealing), the perennial surface alloying process tanks oil baked, grilled to no sparks. 2, will scratch the surface treatment area with angle grinder, grinding depth of 1 mm or more, and grinding out a groove along the rail, preferably dovetail. Ends of drilling deeper scratches, changing the forces. 3, with cotton wool dipped in acetone or ethanol to clean the surface. Precision cylinder, Yancheng cylinders, hydraulic power provided by the Texas Lu Lu force hydraulic machinery plant. Texas Lu force hydraulic machinery plant (www.luliyeya.com) strong, credible, in Dezhou hydraulic machinery and components industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Lu Hydraulic and you hand into the brilliant, for a better future!