Further improvement of the hydraulic system. , The hydraulic system has a small hydraulic excavators clear trend towards variable system change. Because the variable pump system in operation, to compensate for the pressure decreases with increasing flow rate of the hydraulic pump power remains constant, the transfer price of second-hand digging machine, that is equipped with a variable displacement pump hydraulic excavator can regularly make full use of the pump maximum power. When the external resistance increases decreased flow (reduce speed), used excavator transfer transactions, making digging force multiplied; three-circuit hydraulic system. Excavator manufacturing industrial countries earlier, France, Germany, the United States, Russia, Japan, is a major production capacity 3.5-40 m3 bucket hydraulic excavator of the country, large-scale transfer of used digging machine, from the 1980s to begin production large excavators. For example, the United States produced by Marion peeling excavator bucket capacity of 50-150 m3, in Jiangsu transfer of second-hand excavator bucket capacity of 132 m3 walk-draglines; BE (布比赛路斯 Erie) Company The bucket capacity 168.2 m3 walk-draglines, bucket capacity of 107 m3 stripping excavators, etc., is currently the largest excavator in the world. Used excavator transfer prices _ _ Henan Jin Hao used excavators for sale of second-hand digging machine provided 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.