Technique: First, to confirm the situation surrounding the swivel operation, around obstacles, terrain to be aware of second-hand excavator sales, safe operation; the job, make sure the front and rear direction of the track, to avoid tipping or impact; try to. Do not tap the direction of the final drive face Carter used excavators sale, or easy to damage the travel motors or hoses; the job, to ensure full contact with the ground left and right track to improve the stability of the whole dynamic of effective mining methods: When the bucket. between the cylinder and the rod, the arm cylinder and the arm each 90 degrees, the maximum digging force; bucket bucket teeth and the ground to maintain a 30 degree angle, the best cut in the soil digging force of least resistance; with arm excavation Daewoo used excavators sale, should ensure that the arm angle in the range between 30 degrees angle of 45 degrees from the front to the back, while using the boom and bucket, can improve mining efficiency. The basic price of used excavator can be from two places Learn valuation. In our used equipment is generally divided into working time and the length of the factory age of price evaluation. According to the current depreciation of equipment commonly used standard, excavators depreciation of 20% by the first year, decreasing 5 percent each year to calculate the basic price, namely 20% depreciation in the first year, second year 15% depreciation in the third year depreciation of 10% Used Volvo excavator sales in the fourth annual depreciation of 5%. After the first five years, often due to the aging of some parts, normal wear and tear, and some unexpected reason, the device must be a series of renovations, which makes equipment depreciation rate stable at around 5% or less, thereby so prices flat. Used excavator sales company, Kim Ho used excavators, used excavator sales Guizhou 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.