Excavator in use among the general failure is digging machine walking wandering, acquisition of second-hand excavator market, the reason may be assigned to walk seal damage, two pump flow sample sizes, while walking motor problems. Quick discharged hydraulic cylinder as a safety relief valve may be closed lax, or serious damage to cylinder seals and so on. So whether it is new or routine maintenance excavator used excavators have to take seriously, in order to prevent the excavator's failure, in the course of daily use requires careful attention to the maintenance of the excavator. How to choose the right tonnage used digging machine: 1, if your lease is primarily aimed at large-scale earthwork engineering, then the acquisition of second-hand digging machine, recommended the purchase of more than 30 tons of digging machines, this type of mechanical bucket capacity big, big hand digging machine acquisition, loading and thrown Fang, faster. 2, if your lease is primarily aimed at construction sites, road construction, then recommend to buy 30 tons less than 20 tons of digging machines, this type of mechanical bucket capacity is moderate, the body is small, facilitate transitions, Shanghai second-hand digging machine acquisition, At the same adaptability is also strong, regardless of the size of earthwork are capable. 3, if your lease mainly for municipal construction, urban construction, then recommend to buy 10 tons of the following levels of digging machines, such vehicles low fuel consumption, small body, to facilitate transport. Used excavator acquisition market, Kim Ho used excavators (certification), the acquisition 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.