Re: The Home Water Pump Thread Quote:
Originally Posted by bluevolt I have to manually push the shaft blades then it starts rotating but gets jammed after few days again. There is no issue with water pressure that is being pumped. Not sure if it is again the shaft that is causing the problem or a weak capacitor that is not able to start the motor after an overnight.
Please suggest if it is worth to get it again repaired for Approx Rs.500-700 or go for a new one (Avg cost - Rs. 2500). Browsing online gave me a few options like Kirloskar and VGuard motors. We also have another Sarvo motor recently installed for other section of the house. |
Having spent most of my childhood working in my uncle's motor re-winding workshop, from whatever I have seen, your problem is most likely due to weak Capacitor. A crude way of checking a capacitor is, charge, unplug, leave for sometime and short it. A strong capacitor will spark aggressively on shorting. Capacitors wear over time and Motors refuse to start. There is no need to change motor for a weak capacitor.
Since you already have another motor at home, check the capacitance of its capacitor (250 or 125 micro farad). Higher is fine. Plug it in to the suspect motor and check if that solves. Then buy a new capacitor from local electrical shop (should cost about 200-300).
Induction motors are quite robust. They go on for years without much maintenance. However the mechanicals such as bearings need regular lubrication. Warping of shafts are unusual for 0.5 hp pumps, but rusting can be a trouble especially for unused/less-used pumps. Bearings also wear. But these issues will result in excessive vibration and noise. If the shaft is very tight when you rotate manually followed by loud noise while running, we can suspect issues with shaft/bearing/lubrication.
If the capacitor change didn't work, the pump is not that noisy running, then this could be also a problem with starting coil. In which case, you may consider re-winding it or complete replacing.
If you think, not worth taking all the hassle for a 15 year old pump, and prefer to buy a new one, then my choice among your list goes to Kirloskar.
Last edited by Thermodynamics : 20th August 2019 at 12:43.
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