Troubleshooting and Replacement of Bearings in Water Pump
The article discusses the process of diagnosing and solving issues related to water pump bearings. It covers topics such as bearing lifespan, common causes of pump failure, motor inspection, and the steps involved in bearing replacement. Helpful images and detailed explanations are provided throughout the guide.
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Bearing replacement Bearing replacement 08/05/2024 Hideki Miki, Ph.D. (Engineering), JICA Expert
Bearing lifetime Bearing lifetime Bearing is used in rotation shaft of fan, pump, motor and others shown as right. Bearing lifetime is approximately 20000 hours (or 833 days or 2.3 years). Of course, good maintenance extends lifetime, and bad .maintenance shortens lifetime. But bearing lifetime is not eternal. If bearing is broken, bearing should be replaced soon.
Bearing trouble case Bearing trouble case I take care of some goldfishes in my water tub. So, I have installed water pump in water tub for circulating water. One day water pump could not work.
Water pump structure Water pump structure Water pump has simple structure shown as right. Water pump has some parts. - Fan blade cools motor. - Motor rotates fan blade and pump blade. - Bearing supports motor shaft. - Gasket stops water. - Joint connects shaft and motor shaft. - Shaft transfer motor power to pump blade. - Pump blade lifts water.
What is cause? What is cause? If I can make cause clear, I may be able to repair. So, I disassembled water pump and checked each parts.
Is motor broken? Is motor broken? I could not detect damage on fan blade, pump blade and shaft. So, I thought either motor or bearing was broken. I checked whether motor wire is broken or not by tester shown as right. In case of small motor, thermal fuse is usually installed in motor wire. If fuse is cut by overheat, tester can detect it. But I could not detect damage on motor wire.
Is bearing broken? Is bearing broken? I rotated motor shaft by hand, then I felt it was heavy. So, I thought out bearing was broken. I put machine oil into bearing, then motor rotated again. So, I assembled water pump, but water flow was very weak. Therefore, I decided to replace bearing.
Preparation Preparation I bought new bearing shown as right upper to replace it. Of course, new one is same type and same size to old one. Also, I bought tool shown as right lower to remove bearing from motor shaft.
Bearing removal Bearing removal Bearing is firmly attached to motor shaft and cannot be removed by hand. How to remove by tool is; - Hang its claw onto bearing. - Press its shaft against motor shaft. - Pull out bearing by rotating and pushing out its shaft.
Bearing replacement Bearing replacement I removed old bearing and installed new one shown as right. And I assembled water pump again, then water flow became very strong. I kept water pump working several hours. But I did not detect problem. Finally, I could repair water pump. Good job!
Bearing maintenance and replacement Bearing maintenance and replacement Almost facility equipment has motor. So, almost facility equipment has bearing. Bearing has short lifetime than other parts. So, bearing maintenance and replacement can extend facility equipment lifetime.
End End Thank you for cooperation with training course. Email: mikiikka277@hb.tp1.jp Facebook: Miki Hideki Document server: http://gaga.jellybean.jp/indexbsl.html
