The correct method for replacing the pump core of a Wegeser vane pump

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When using Wegeser vane pumps, it is common to encounter a situation where all other parts are in good condition, but the pump core is severely worn. To keep the vane pump in use, we have to replace the pump core. So here comes the question: how do we properly replace the pump core of a Wegeser vane pump? 　　First of all, when we plan to replace the pump core, we should first consider checking the positioning control inside the pump casing. If the positioning hole is deformed, it is best to replace the entire pump. When replacing the pump core without having to replace the entire pump, the following points should be taken into account: 1. Check whether the shaft seal is aged or deformed. If the bearings are severely worn, extra care should be taken when replacing the pump core. It is recommended to use a flat, hard object with an outer diameter that matches that of the shaft seal, slightly larger than the inner diameter of the bearing, and an inner diameter slightly larger than the outer diameter of the pump shaft, in order to position them in place and prevent the shaft seal from deforming or the bearings from being damaged. 　　2. When replacing the pump core, make sure that the models of the old and new cores are compatible; installation can only proceed after confirming this compatibility. Before installation, clean the inner wall of the pump casing thoroughly, apply lubricant, and then install the pump core. If the pump core cannot be inserted smoothly, check whether the stator of the pump core and the oil distribution plate are aligned; adjust their alignment before proceeding with the installation. After installation, verify that the positioning pins of the pump core are fixed in the corresponding holes in the pump casing, and check that the sealing rings are present in full number and in good condition. To prevent the sealing element from being cut, the connection screws of the pump casing should be tightened gradually and evenly in an angular pattern. 　　3. When installing the oil pump, first check whether the sealing rings on the inlet and outlet flanges of the oil pump, as well as the associated pipes, are aged or deformed. At the same time, clean the dirt from the inner walls of the inlet pipe, and inspect the sealing performance of all connections in the inlet pipe. 　　4. To adjust the direction of the oil inlet and outlet of the oil pump, simply unscrew the fixing screw of the pump casing in order to rotate the upper pump casing; once it is in the desired position, tighten the screw again ； Do not lift the pump core, to avoid misalignment of the positioning pin of the pump core with the positioning hole in the pump housing, or misalignment of the sealing ring at the connection between the upper and lower pump housings. 　　5. Check whether the coupling is worn or deformed, and whether the pump shaft is aligned with the motor shaft after the oil pump is installed. A simple way to do this is to turn the coupling by hand and ensure that the rotation is even and smooth.
6. Check whether the motor’s shaft and bearings are deformed or worn. If there is any wobbling in the shaft, it is necessary to determine whether it is due to shaft deformation or bearing wear, in order to prevent motor-related issues from affecting the pump’s service life. 　　7. Before starting the motor, check whether the hydraulic oil in the tank is clean enough and whether the filter screen is intact and clean. It is recommended to thoroughly clean the tank and replace it with new hydraulic oil and filter screens that meet the standards. To prevent pump damage, make sure the pump is filled with hydraulic oil before starting it ； Release the exhaust valve at the oil pump outlet to remove air from the pump and pipelines, and perform a trial start with no load; once operation is normal, tighten the exhaust valve or the outlet connection. 　　8. During the operation of the oil pump, it is necessary to check whether the oil level, oil temperature, and operating pressure meet the required standards. After normal operation, the oil level should generally be at least 50 mm above the top of the filter screen; otherwise, the oil pump is prone to drawing in air, which can cause noise. The oil temperature should ideally be kept below 60 degrees Celsius, in order to prevent the protective oil film that forms naturally on the friction surfaces from being damaged due to excessively high temperatures. 　　By following the steps above properly, replacing the pump core becomes much easier. Autos recommends that you avoid causing damage to other components as a result of replacing the pump core, as that would be counterproductive. The original text is from http://www.aotuoshi.com/news_48.html