Usually, if a bearing is going bad it is pretty consistent in the noise, smoke, burning smell it may make. This sounds more like a problem with the motor to brush belt and tangled up hair, etc. Take apart the brush and clear out any tangled hair, dust, etc. and check and replace the belt.
I believe the bearings in most Vacuum cleaners are Sealed bearings, and are generally maintenance free. Like I said before, usually, if a bearing is going bad it is pretty consistent in the noise, smoke, burning smell it may make.
I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514
The squealing you hear is more than likely the belt squealing, if the rotating brush gets hung on something. Or the belt is simply getting old and needs to be replaced. Unfortunately, they don't last forever.
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this is in regard to a Vornado VAQS 35 AIR PURIFIER!!!! THERE IS NO BELT - IT IS NOT A VACUUM CLEANER. Again, after it runs for a while - a sudden squeal comes from it -- it stops, it keeps running. I have turned it off for now -- does the motor need oil? If so where and what type? If the motor requires replacement can it be done?
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