Since the reform and opening up, used excavator sales, positive introduction, digestion and absorption of foreign advanced technology, second-hand excavator sales market, to promote the development of China's excavator industry. Wherein Guiyang mining machinery plant, construction machinery plant Shanghai, Hefei mining machinery plant, the Yangtze River were the introduction of the German excavator factory Liebherr (Liebherr) Hydraulic Mining Company A912.R912.R942.A922.R922.R962.R972.R982 manufacturing technology. A few years later, the introduction of Germany Demark Hangzhou Heavy Machinery (Demag) the company's H55 and H85 hydraulic excavator manufacturing technology, the introduction of the German Construction Machinery Factory Beijing Ao Jiakai (0 & K) Company RH6 and MH6 hydraulic excavator manufacturing technology. Hydraulic oil viscosity hydraulic oil viscosity determines the principle that, in consideration of the hydraulic circuit operating temperature and efficiency of the premise, so that (for pumps and motors and other components) hydraulic oil viscosity is in the optimum range (16-36x10-6mm2 / s); and ambient temperature corresponding to the lowest viscosity of the cold start short ≤1000X10-6mm2 / s; and highest viscosity oil leakage 90 ℃, corresponding to a short time allowed ≥10X10-6mm2 / s. Used excavator sales information, Kim Ho used excavators, used excavator sales by Shanghai Used Construction Machinery Co., Ltd. Jin Hao. Shanghai Jin Hao Used Construction Machinery Co. (www.jinhaosh.cn) is the Shanghai Minhang District, mining machinery leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Kim Ho used excavators in leadership with the staff warmly welcome all inquiries negotiations to create jinhao used excavators better future.