(1) must be able to form a sealed working space, the volume of which can do periodic variation. (2) There must be coordinated with the volume change with flow mode. 2, hydraulic pump type structure can be divided according to their gear pumps, vane pumps, piston pumps and screw types. Whether the change in output flow can be divided dosing pumps and variable pump. Press the oil can change the direction of the hydraulic pump can be divided into one-way and two-way pump pumps. Three hydraulic equipment to strengthen the maintenance of equipment maintenance points ensure that the equipment is working properly is very important link. Currently four hydraulic transmission equipment often wrong: day "mental illness", referring to the price of the hydraulic system hydraulic repair bad work good, sometimes not executing agency action; the 2nd "take the sweating," refers to a system leak seriously; three days. " Jitter disease, refers to the movement of the actuator beating, vibration or crawl;. 24 "high fever" disease hydraulic repair how, refer to the hydraulic system oil temperature is too high if the above analysis and diagnosis of the disease in four, looking to generate The reason the root cause, while the hydraulic equipment for scientific management of common faults propose preventive measures, the failure of the hydraulic system can be reduced or avoided. Which is good hydraulic repair, hydraulic repair Yan'an, Xi'an, Xi'an Chengtong Chengtong hydraulic repair hydraulic maintenance Limited availability. Xi'an Chengtong Hydraulic Maintenance Co. (www.huosu360.com) strong, credible, in Xi'an, industrial maintenance, installation and other industries has accumulated a large number of loyal customers. The company better work attitude and continuous improvement innovative ideas will lead the Xi'an-hydraulic service and you work through into the brilliant, for a better future!