The pump can be considered controlled variable caused by poor organization, such as a foreign body into the variable mechanism, set aside the order marks in the control piston, wear marks, scars and other pump, resulting in unstable control piston (4) Check the oil valve Deputy Deals Pressure belts for wear or scratches stepped phenomenon A7V78DR2.0LZF00 A7V78DR2.0LZF00 A7V78DR2.0LZF00 (1) output pressure is too low when the pump is self-priming in the state, if the inlet line or system leak hydraulic cylinder, one-way valve, When the valve leak have a greater domestic pumps, all the pressure will not rise up A7V78DR2.0LZF00 A7V80LV5.1RSF00 A7V250EL5.1RSF00 A7V40SC5.1LSF00 A7V78LV2.0RPF00 A7V355LV2.0RZF00 piston pumps work in the fuel injection pump camshaft under the influence of the cam and plunger spring, forcing the plunger up and down reciprocating motion, thus completing the task pumping hydraulic motor failure analysis and troubleshooting (1) insufficient output torque ① of the housing bore cylindrical roller with too loose or wear after use into the oil chamber of the pressure caused by oil leaking back oil chamber (oil chamber), internal leakage increases, it should brush or roller accompanied by re-processing. ② rotor blade root round wear, internal leakage volume. ③ dirt and roller blades stuck. ④ between the roller and the blade shaft due to poor precision and assembly precision, the roller friction between the outer and the root circle blade large, the film is cut through, resulting in thousands of friction. Domestic hydraulic pumps, hydraulic preferred crystal Chong (certification), the hydraulic pump from 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 creating hydraulic leadership with the staff warmly welcome all inquiries negotiations to create the crystal creating hydraulic better future.