Domestic hydraulic excavator with a large gap between overseas, which we have to admit that a large number of early domestic introduction of foreign technology joint production of excavators, would like to use the market for technology, with little success. This is the same boat and China's auto industry, saying the basis of the decision height, I think that the main cause of the gap between the country's industrial base! The design and manufacture of hydraulic excavators requires a strong industrial base as a guarantee, and our industry started late because of historical reasons, used excavator, basic scientific research can not keep up, resulting in China's hydraulic excavator is always a step, but this river. In addition, the hydraulic excavator manufacturing also involves special materials, complex components casting, precision machining, sintering copper surface, surface heat treatment, high-performance seals, hydraulic integration technology engineering and so on. Sixth, the pump is the power component of the hydraulic system, its role is the original motivation of the mechanical energy into fluid pressure energy, the hydraulic system of pumps where to sell second-hand digging machine, which provides power to the entire hydraulic system. So check the hydraulic pump is also very important, when you purchase two mobile phones to hand to touch the pump Japan imported second-hand digging machine, there is no shock to observe hand feeling, and then check the pump has no cracks, whether there is a serious case of oil spills, conduct Where to sell second-hand-dug test machine, observe whether the powerful pump, with or without noise. Seventh, check the electrical system, if the circuit can work, then check the motherboard into the computer system, you can see into the system if the operating conditions, such as rotation, pressure maintenance mode, then prove that normal computer board . Japan imported second-hand excavator, used excavator Shandong, Kim Ho-hand excavator sales provided by Shanghai Jin Hao Used Construction Machinery Co., Ltd .. Used Construction Machinery Co., Ltd. Shanghai Jin Hao (www.jinhaosh.cn) strong, credible, in Shanghai Minhang District of mining machinery industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead jinhao Excavators and you hand into the brilliant, for a better future!