When work began to import second-hand excavator mini excavator, but suddenly there will be side tracked and can not move the arm fatigue, is the reason? The reason is that most of the hydraulic oil is not clean, tiny dirt clogging the valve in a small intermediate piston orifice. You can remove the safety valve to clean, remove the orifice clogging it. The inspection orifices are not blocked, the pressure relief valve is still why not tune up? This situation is due to the majority of the cone valve seat closed lax, allowing hydraulic C chamber not be established. With the expansion of China's construction machinery market, the purpose of buying groups become more rational. According to experts, the future purchase of small construction machinery main groups: First leasing company. Users do not need to buy the construction, maintenance and storage facilities, only when needed in order to obtain the right to use the lease form to the equipment. Second, the construction units. They buy equipment is designed to meet the recurrent internal use. Third, individual project contractors, primarily for the purchase of equipment to undertake the project. Such customers in small excavators larger proportion of buyers in the future may develop into leasing companies and engineering contractors. With the growing popularity of small construction machinery, the customer experience has been continuously enriched used mini excavators for sale, buy psychological matures. Thus, the economic and practical, cost-effective products more favored by the market. Customers increasingly demanding requirements for product quality at the same time, the product of after-sales service is also a higher demand. Used Mini excavators for sale _ _ Sichuan Jin Hao Excavators used mini excavator price offered by Shanghai Jin Hao Used Construction Machinery Co., Ltd .. Used Construction Machinery Co., Ltd. Shanghai Jin Hao (www.jinhaosh.cn) is Shanghai Minhang District, a leader in mining machinery, 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 Excavators in leadership with the staff warmly welcome all inquiries negotiations to create jinhao Excavators a better future.