Vibration and noise occur simultaneously. They not only cause harm to the operator of the machine pump maintenance, but also pollute the environment. (1) mechanical vibration and noise as the pump shaft and motor shaft misalignment or dieback pump agency, bearing rotary shaft coupling damage, breakage and elastic pad mounting bolts loose will produce noise. For high-speed operation or transfer large energy pumps, to regularly check, record the amplitude, frequency, and noise of the components. As the natural frequency of the rotation frequency of the pump and the pressure valve are the same, will cause resonance pump sales, the pump speed can be changed to eliminate resonance. Piston oil spill following main reasons: (1) the spindle shaft seal is damaged or defective scratch; (2) internal leakage is too large, resulting in increased pressure oil seal, and the seal damaged or out; (3) drain line too small for too long, so that the seal leakage; (4) external pump tubing loose fittings injury, the gasket aging or cracks; (5) variable adjustment mechanism bolts loose, broken seals; (6) cast iron pump casing There are bad blisters or welding. Hydraulic pump test _ _ creating a hydraulic factory direct crystal grain from Jinan Chong Hydraulic Machinery Limited. Jinan Jing Chong Hydraulic Machinery Co., Ltd. (www.jnjcyy.com) (www.jnjcyy.com) strong, credible, in Jinan, Shandong mining machinery industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead crystal create hydraulic and you hand into the brilliant, for a better future!