What are the causes of piston pump overheating and oil leakage

There are two reasons for excessive heat generation of piston pumps, one is the heat generated by mechanical conflict. Because the appearance of the movement is in a state of dry conflict or semi-dry conflict, the moving parts are in conflict with each other and generate heat. The second is the heat generation of liquid conflict. The high-pressure oil leaks into the low-pressure chamber through various gaps, and a lot of hydraulic energy is lost into heat energy. Therefore, the accurate selection of the gaps between the moving parts, the volume of the fuel tank and the cooler can eliminate the appearance of excessive heat generation and high oil temperature of the pump. In addition, the oil return filter is blocked and the oil return back pressure is too high, which will also cause the oil temperature to be too high and the pump body to overheat.
The oil leakage of the plunger pump is mainly due to the following reasons: (1) the oil seal of the spindle is damaged or the shaft has defects and scratches; (2) the internal leakage is too large, and the pressure at the oil seal increases, and the oil seal is damaged or flushed out; (3) the oil drain pipe is too thin and too long, so that the seal leaks oil; (4) the external oil pipe of the pump is loose, the pipe joint is damaged, and the sealing gasket is aged or cracked; (5) the bolt of the variable conditioning mechanism is loose and the seal is damaged; (6) the cast iron pump casing has sand hole or poor welding.