Hoover vacuum motor problem


I have a Hoover upright vacuum cleaner model U3350. When switched on, the motor makes a humming sound, and it smokes after the time it takes to turn it on and off to see if it's working!
I took the motor out thinking the brushes may need replacing, but they looked fine - well over a centimeter left. I made sure they were free to move in their guides and the spring mechanism is pushing them down the guides OK.
As the brushes themselves looked fine I cleaned up the area on the motor shaft where the brushes contact (I think this may be called the commutator) as it looked black. I lightly sanded back to the original copper colour and cleaned out the grooves between the sections of the commutator.
On reassembly, the motor still didn't work and it smoked again.
So, I took the motor back out. The commutator is again black with heavy deposits from the brushes.
Can anyone tell me from this description where the problem lies please. Is this a sign of a burned out motor, or does the problem lie elsewhere?
I appreciate any help.
Regards
Neil
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Sounds like a dead motor to me. With the proviso that I'm assuming it turns ok by hand and there isn't something preventing it turning.
Steve
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Thanks Steve, the motor turns by hand fine.
I think I can get a replacement armature, would replacing that be likely to fix the fault, or could the problem be elsewhere?
Neil
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Errr.... Both possible. If you're going to have to buy the armature, I would try to get it tested before committing yourself. Or can you get a complete motor? Remember all parts of it are probably the same age, and If you replace one part and then something else goes, it gets right up your nose.
Steve
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Call the hoover service line, IIRC hoover offer a lifetime guarantee motor's. They replaced mine when it was years out of warranty
hth

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