Piston pump is a commonly used hydraulic transmission component, widely used in various mechanical equipment. However, in some cases, plunger pumps may experience excessive heating and oil leakage, which can affect the efficiency and lifespan of the pump and require timely handling.Excessive heating is one of the common problems with plunger pumps, which can be attributed to the heat generated by machine friction and liquid friction. The heat generation caused by machine friction is due to the mutual friction between the moving parts of the pump in dry or semi dry friction state, resulting in the occurrence of heat generation phenomenon. The heat generated by liquid friction is due to high-pressure oil leaking into the low-pressure chamber through various loopholes, causing a large amount of hydraulic energy to be lost and converted into heat energy, resulting in excessive heating. To avoid these problems, the following measures can be taken:Firstly, accurately select the gap between moving parts, fuel tank capacity, and cooler. This can effectively reduce the phenomenon of excessive heating and high oil temperature of the pump. Secondly, replace the return oil filter in a timely manner to prevent it from clogging and causing excessive back pressure in the return oil, which can lead to problems such as high oil temperature and overheating of the pump body. In addition, other measures can be taken, such as installing radiators, increasing fuel tank capacity, and changing the working mode of the pump, to avoid excessive heating of the pump.Oil leakage is another common issue with plunger pumps. The reason can be attributed to damage to the main shaft oil seal or defects or scratches on the shaft; Excessive internal leakage causes an increase in pressure at the oil seal, leading to damage or dislodgement of the oil seal; The oil drain pipe is too thin and too long, causing oil leakage at the sealing point; The external oil pipe of the pump is loose, the pipe is damaged, the sealing gasket is aging or has developed cracks; The bolts of the variable adjustment mechanism are loose and the seal is damaged; Cast iron pump casing may have sand holes or poor welding. To solve the oil leakage problem, the following measures can be taken:Firstly, regularly inspect the main shaft oil seal, shaft, and internal structure of the pump, and promptly replace and maintain any faulty components. Secondly, check the oil drain pipe, external oil pipe, and sealing gasket