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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Repairing rough running 5 HP single phase motor
"Ignoramus6689" wrote in message .. . For $12.00, I bought a 5 HP, SINGLE PHASE Baldor compressor motor that has a problem. When I spin it up by hand, it turns, but a little roughly and then spins by itself, but not for very long. It stops too soon. It is not, by any means, seized, but there is too much friction compared to what it should be. I did not run it under power yet It is ball bearing based, which I concluded after seeing grease fittings on it. My hope is that it should be an easy fix. Either the grease caked, or perhaps the bearings need replacement. Any thoughts on how to proceed? I did the same just a few months ago. I was bequeathed two complete(ly broken) and water-damaged 5HP compressors. Both had Baldor motors. One motor was well and thoroughly burnt out. The other was "grumbling" like yours. It's a little of a trick to get the motor apart and get the bearings out, but no big deal. The hardest part will be to get the shaft end bearing off the shaft, since it usually corrodes in place. Lots of oil and fine grit paper are the trick to getting the shaft back to its original o.d. without damage. You'll need a small gear puller to start the bearing moving on the shaft. Then it should slide off easily. The bearings are stock NGK items in my local bearing shop -- about $14.00 each. Take care pressing them back into their seats -- they aren't tight fits, but you should avoid any pressure on the inner race. Make a tool, if you aren't lucky enough to have a bearing pressing mandrel that fits. A large wrench socket that is no more than, say, 0.050" smaller than the o.d. of the outer race will work well as a tool. LLoyd i |
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