Several aspects you must pay attention to when repairing hydraulic pumps

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There are many reasons for hydraulic pump damage, and each type of damage requires a different repair method. However, for some experienced repair technicians, when repairing hydraulic pumps, there are several points that deserve special attention; they can easily be forgotten, leading to additional damage to the hydraulic pump. 　　First: Some maintenance technicians believe that new cylinder liners and pistons are standard components, so there is no need to consider size issues when replacing cylinders or pistons, as they are interchangeable with one another. In fact, this view is incorrect; there are certain differences between each cylinder or piston. 　　Second: When repairing hydraulic pumps, many technicians pay attention to checking the level of lubricating oil, ensuring that there is enough oil and topping it up according to the standards. However, they overlook the need to check the quality of the lubricating oil and to replace it if it has deteriorated. Everyone knows how severe the damage that low-quality hydraulic oil can cause to hydraulic pumps is, so no further details will be given here. 　　Third: Some mechanics believe that applying a layer of butter when installing the cylinder gasket can improve the sealing performance of the diesel engine and reduce leaks. This mistaken view has influenced many people, who are unaware that such actions actually affect the performance of diesel engines. 　　Fourth: Some mechanics, when replacing bearing shells, use sandpaper to grind them in order to increase the contact area between the bearing shells and the crankshaft, as a substitute for scraping the shells. This method is highly unsuitable for actual maintenance, as the abrasive particles on the sandpaper are hard while the alloy used in bearing shells is soft; as a result, these particles can easily penetrate into the alloy during grinding. This accelerates the wear of the shaft journals when the diesel engine is in operation, thereby reducing the service life of the crankshaft. 　　Fifth: Since the piston and piston pin are in a interference fit, the piston should be heated to cause it to expand before installing the piston pin. As a result, some maintenance workers place the piston directly over an open flame to heat it up. Such an approach is highly incorrect, as the different parts of the piston have varying thicknesses, which results in different degrees of thermal expansion and contraction. Heating with an open flame causes uneven heating of the piston, making it prone to deformation ； Carbon ash can also adhere to the piston surface, reducing its service life. 　　Sixth: In the maintenance of hydraulic pumps, bolts in many components are required to be tightened to specific torque values; these components include the transmission case, cylinder head, wheel hubs, connecting rods, and front axle. The appropriate tightening torques are specified in the manual, and they must not be changed arbitrarily. Using the wrong bolts or torque may cause a component of the hydraulic pump to become loose, leading to damage. 　　Seventh: When the hydraulic pump is operating under overload, or when there is insufficient water in the tank or poor heat dissipation, add cold water to the tank immediately in order to achieve rapid cooling after prolonged operation. This practice is incorrect and is very likely to cause the cylinder head and cylinder block to explode. We should wait until the hydraulic pump has cooled down before adding coolant to ensure effective heat dissipation. 　　The above are the key points that the editor believes should be taken into consideration when repairing hydraulic pumps. I wonder if you have succeeded in winning the bid? If one or more of these phenomena occur, fix them right away for the sake of safety during future hydraulic pump repairs!