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The hydraulic oil of hydraulic system’s pollution mainly comes from new oil pollution grinding machine water well drill rigs for sale, external contaminants, the engineering drilling machine’s internal pollutants and the pollutants in the hydraulic system.Henan Daswell Machinery is a professional manufacturer of mining machine for almost 30 years in China. We are dedicated to supplying our customers with best service and products, our major products include:portable water well drilling rigs,If you are interested in our products, please contact us freely: sales@daswell.com Some of the hydraulic oil pollution level is greater than NAS11, which cannot satisfy the engineering drilling machine’s requirements hydraulic oil for hydraulic system. So we should be careful before buying hydraulic oil and ensure the oil quality. External pollutants mainly are the atmosphere dust which comes through drill hole and shaft seal tank invade into internal system. So dust prevention is an important part during the engineering drilling working outside. In addition, the residual contaminants in the ring section of the components process small mobile crusher, assembling, debugging, packaging portable rock crusher, storage, transportation and installation are important pollution sources. So the special components assembling and debugging should be done in the clean room. In the process of work packing machine, the hydraulic system of engineering drilling machine will continue to produce metal particles and sealing material of wear debris. So we should do regular cleanness to avoid the serious pollution caused by accumulate over a long period.