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, that is equipped with a variable displacement pump hydraulic excavator can regularly take advantage of the maximum pump power. When the external resistance increases decreased flow (reduce speed), so digging force multiplied; three-circuit hydraulic system. According to the engineering machinery online data revealed that, as of September 2014, six tons of the following mini-excavator sales totaled 1006 units, of which 55.0% market share of foreign brands, domestic brand market share 45.0%. In addition, sales of more than 6 tons excavators 3139, three large used excavators recovered 61.0% market share of foreign brands, domestic brand market share of only 39.0%. According to the information Sany aspect, Haikou used excavators recovered from 2011 to 2013, the company excavator domestic market share reached 11.56%, 15.8%, 13.7%, surpassing Carter, won the industry first. The first half of this year, its market share of over 15% again, the industry believes that this year the company won the first, to achieve 'four load sales crown' no suspense. Small second-hand excavator used excavators recovered _ _ Jin Hao Yinchuan used excavators recovered from 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.