Unit is making a noise. have taken it apart and the cooling fan seems to be lifting up slightly and rubbing against the windings. fan is part of the shaft, does this need new shaft or bearings or seals please help.
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Re: dynamic mx91. noisy.
At the back end (top) of the shaft, there should be a thrust bearing. It may just be a single ball. Make sure it's in place. It keeps the shaft from oving up too far. If it's a ball type bearing, it sounde like it's not any good. If you have access to an industrial bearing supplied in your area, they will have what you need a lot cheaper than a parts supplier.
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