Since the hydraulic motor and hydraulic pump to different operating conditions and maintenance of the hydraulic pump (imports), their performance requirements are not the same, so between the types of hydraulic motors and pumps the same, there are still many differences. First hydraulic motor should be able to forward and reverse, which requires that its internal structure symmetry; hydraulic motor speed range required is large enough, especially to its lowest steady speed have certain requirements. Therefore, it is usually by rolling or hydrostatic bearings; secondly because of the hydraulic motor to work under pressure oil input conditions, and therefore does not have to have the self-absorption capacity, but requires some initial tightness in order to provide the necessary starting torque. Because of these differences, so that the hydraulic motor and a hydraulic pump is quite similar in structure, but not reversible work. Hydraulic pump flow can be adjusted according to whether the classification can be divided into: variable displacement pump and dosing pumps. Output flow can be adjusted as needed is called variable displacement pump, the flow rate can not be adjusted is called a metering pump. Commonly used by the hydraulic system pump structure is divided into: gear pumps, vane pumps and piston pumps three kinds. Gear pumps: smaller specializing in pump (import), the structure is relatively simple, strict cleanliness requirements for oil, the price is cheaper; but by the unbalanced force refinement shaft pump (imported), badly worn, the more leaks great. Vane pump: divided double acting and single acting vane pump vane pump. The pump flow evenly, smooth operation, low noise, high efficiency for the pressure and volume than the gear pump, complex structure than the gear pump. Piston: high volumetric efficiency, the leak is small, can work under pressure, mostly for high power hydraulic system; but the complex structure, materials and processing high precision, expensive, high oil cleanliness requirements. Repair pump (import) phone, crystal creating hydraulic (certified), the hydraulic pump by Jinan Jing Chong hydraulic machinery Limited. Jinan Jing Chong Hydraulic Machinery Co., Ltd. (www.jnjcyy.com) (www.jnjcyy.com) Shandong Jinan, mining machinery leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum meet customer needs. In the crystal to create a hydraulic leadership with the staff warmly welcome all inquiries negotiations to create the crystal to create a better future for the hydraulic.