Check the arm and cylinder for cracks or leakage. Check the battery electrolyte, a large second-hand digging machine, avoid low in the following lines. Air filter to prevent dust laden air into a large number of important parts excavator, digging machine Kobelco 60 used should always check the cleaning. Always check the fuel, lubricating oil, hydraulic oil, coolant, if you need to add, Henan used digging machine, and the best choice for fluid in accordance with the requirements of the specification, and kept clean. 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, when system pressure reaches the setting value, the swash plate angle variable pump is reduced, the pump can only be maintained at the pressure required to maintain the "residual" flow state to avoid overflow overflow 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. Henan second-hand excavator, used excavators Kim Ho, a large second-hand digging machine provided by Shanghai Used Construction Machinery Co., Ltd. Jin Hao. Henan second-hand excavator, used excavators Kim Ho, a large second-hand digging machine 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.