The steel used for the conventional connecting bearings of the water pump shaft is high carbon chromium bearing steel (GCr15). Because the smelting of high-quality bearing steel involves vacuum deoxidation, electromagnetic stirring, and low oxide content, it can withstand both high contact compressive stress and high tensile stress. So, how should the water pump shaft be repaired if there is slight bending or wear, or if there is a hook?
1. Axle neck hook and repair after wear and tear
The pump shaft journal using sliding bearings is generally repaired by plating, copper plating, or stainless steel plating due to poor lubrication or the introduction of iron filings, sand particles, etc. into the lubricating oil, which may cause scratches or grooves on the pump shaft journal, as well as wear on the rubber guide bearing. Then, the standard diameter is machined by using a car or grinding method.
2. Repair of bent pump shaft
For pump shafts with smaller diameters, copper sheets can be placed at the bends and straightened by tapping with a hammer; For pump shafts with larger diameters and less severe bending, a screw corrector can be used for straightening.
3. Repair of shaft threads
When the thread damage at the end of the pump shaft is relatively minor, a mixed file can be used to repair the damaged thread and continue to use it. If the damage is severe, first reduce the size of the pump shaft end, then press on a liner and thread it onto the liner; Electric or gas welding can also be used to weld the threads on the pump shaft end, and then the threads can be machined.
4. Keyway repair
If the surface of the keyway is rough and the damage is not severe, it can be smoothed with a file. If the damage is severe, the old groove can be welded and a new groove can be opened elsewhere, but for pump shafts with high transmission power, a new shaft must be replaced.
