The main hydraulic jacks and crawling phenomenon is the driving force actuator system pressure on the actuator resulting in a critical state of equilibrium resistance suffered hydraulic jacks, moving parts in the static friction and dynamic friction of alternation, jitter phenomenon. Hydraulic competing we summarize the following approach, I hope this article can help to you. 1) cylinder air intrusion. Should be added to the exhaust system, or the hydraulic cylinder with the greatest stroke of fast motion gyd hydraulic jacks, forcing the exclusion of air. 2) at the cylinder head gasket too tight or too loose. Should be adjusted to give it a proper seal tightness, back and forth by hand to ensure that the rod can be pulled smoothly without leakage. 3) the direction of the piston and piston rod concentricity bad. Should be corrected, adjusted. 4) After the installation of hydraulic jacks direction is not parallel with the rail. Should be adjusted or re-install. 5) rod bent. Should straightening rod. 6) the difference between a rigid rod. Increase the rod diameter. 7) The clearance between the cylinder moving part is too large. With the gap should be reduced. 8) hydraulic jacks installation position shift. Parallel cylinders should be checked with the rail 400 hydraulic jacks, and calibration. Hydraulic jack is a hydraulic cylinder using a plunger or a jack jacking piece rigid, light weight, easy to carry, easy to move and so on. Hydraulic jack lifting mechanism is generally available only for lifting heavy objects. By type hydraulic jack can be divided into the following categories: hollow jack, thin jack, electric jack, separate hydraulic jacks. The company's high-quality products, sold to domestic cities and towns, people use many industries, the majority of users. 60t hydraulic jacks, hydraulic power Lu (certified), hydraulic jacks are provided by Lu of hydraulic equipment plant in Texas. Texas Lu force hydraulic machinery plant (www.luliyeya.com) is a leader in Dezhou, hydraulic machinery and parts, over the years, the company is implementing 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 force a better future.