This article mainly introduces usage of hydraulic piston pump.The efficiency of the hydraulic system mainly depends on the volumetric efficiency of the hydraulic pump. When the volumetric efficiency drops to 72%, it needs routine maintenance, replacing bearings and aging seals, replacing or repairing friction pairs beyond the fit clearance to restore their performance.

Oil supply form of hydraulic pump
The hydraulic piston pump can be divided into two types: pressure oil supply and self sucking oil. Pressure oil supply type hydraulic pumps mostly use a pneumatic tank, there are also hydraulic pumps with oil filling pump to provide pressure oil into the inlet of the hydraulic pump. The self sucking hydraulic pump has strong self sucking ability and no external fuel supply. After 3000 hours of use, operators need to check the piston pump 1-2 times a day whether the sound of the hydraulic pump is normal. If it is found that the speed of the hydraulic cylinder drops , it is necessary to check the disintegration of the filling pump whether there is scratch on the edge of the impeller and whether the clearance of the internal gear pump is too large.
For the self-priming plunger pump, the oil in the hydraulic tank should not be lower than the limit of the oil standard, to maintain a sufficient number of hydraulic oil. The higher the cleanliness of the hydraulic oil, the longer the service life of the hydraulic pump.

Bearings for hydraulic pumps
The most important part of the piston pump is the bearing, if the bearing clearance, it can not guarantee the normal clearance of the three pairs of friction pairs in the hydraulic pump, but also will destroy the friction pairs of hydrostatic film thickness, reduce the service life of the piston pump bearing. According to the information provided by the hydraulic pump manufacturer, the average service life of the bearing is 10,000 hours, which requires replacement.
In the replacement of bearings, attention should be paid to the original English letters and models of bearings, piston pump bearings are mostly used with large load capacity bearings, it is best to buy the original manufacturer, the original specifications of the products, if the replacement of another brand, should consult the bearings experienced personnel table exchange, the purpose is to maintain the accuracy of the bearing grade and load capacity.