Prevent component volumetric efficiency drops to abnormal wear and normal wear and tear, should pay attention to. The former may take place within a very short time, you can check the oil through quality and combine function of the system is good or bad (such as whether the normal operation of the actuator, used excavator factory, the speed is decreased, etc.) to judge; the latter should follow certain The law should be a comprehensive study, second-hand excavator manufacturers take timely measures. System check the relevant parameters of the hydraulic pump large hydraulic excavator control two main ways: ultimate load regulator with pressure shut-off function (ie CUT-OFF function) (GLR) and load sensing regulator (LS) mode. The role of CUT-OFF function is used excavator plant market, when system pressure reaches the setting value, the swash plate angle professional second-hand excavator factory, variable pump is reduced, the pump can only be maintained in maintaining the pressure required "residual" flow state to avoid overflow relief valve overheating. To achieve this purpose, the system parameters to match the technical requirements so that the setting value is lower than the CUT-OFF valve set-value of the primary circuit pressure valve; otherwise, the primary pressure relief valve open will result in overheating. Used excavator factory Jin Hao _ _ Used Excavators Used Excavator Factory quotes provided by Shanghai Used Construction Machinery Co., Ltd. Jin Hao. Used excavator plant _ Kim Ho-hand excavator used excavator factory price _ is Shanghai Jin Hao Used Construction Machinery Co. (www.jinhaosh.cn) this year introduced a new upgrade, the above picture is for reference only, please call or pictures on this page contact telephone number, to obtain the latest information, contact: Mr. Chairman.