Sealed volume pump are relying on the principle of changes to the work, it is generally referred to as a positive displacement pump plunger 2 is mounted on the cylinder 3 to form a sealed volume a, under the action of the spring plunger 4 is always pressed on the eccentric 1. A prime mover driven eccentric rotation of the plunger 2 reciprocates, so that the size of a sealed volume generation cycle [2] of alternates. When a small to large, from the partial vacuum is formed, so that the oil tank at atmospheric pressure effect, the suction tube to open the top one-way valve 6 into the oil chamber a suction is achieved; on the contrary, when a from big hours, a cavity suck the oil will top the one-way valve 5 into open systems achieve oil pressure. Such pump to the prime mover input mechanical energy into fluid pressure energy, the prime mover driven eccentric continues to rotate, the pump will continue to suction and pressure oil. Piston pump bearing shaft is the most important element to detect pump bearing portion, if in bearing clearance is not guaranteed portion of pumped fluid permits three normal friction pair gap, but also vice rub all bad broken hydrostatic bearing oil film thickness, reducing the plunger so that the bearing shaft pump with life. According to information provided by the manufacturer of the pump bearing shaft pumps are flat, the service life of 10000h, more than this but also to the need to change the value of the new port. To the axis of the discharge under split bearings, no professional testing equipment is unable to detect the bearing axis gap swim out of the hydraulic pump repair, only using visual, such as found in the roller table marked with complexion changed or marks, it must be replaced. In more should repair the pump, when changing the shaft bearing note bearing the letters and original models, both large bearing axis column plunger bearings with large load capacity, it is best to buy the original format of the original regulation, home plant products, if replaced with another brands, should be bearing axis of experienced personnel to teach your look-up table on the exchange, the purpose is to maintain equi-precision bearing axis level and load capacity. Hydraulic repair, hydraulic pumps, hydraulic preferred by the Jinan Jing Jing Chong Chong Hydraulic Machinery Limited. Jinan Jing Chong Hydraulic Machinery Co., Ltd. (www.jnjcyy.com) (www.jnjcyy.com) strong, credible, in Jinan, Shandong mining machinery industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead crystal create hydraulic and you hand into the brilliant, for a better future!