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Hello, feel for any detectable sideways play in the motor bearings, do that by putting side ways pressure on the motor hub, if you can feel any play at all. the motor bearings are shot.... typical cure is to replace the motor.
New sleeve bearings are not readily available, but if you can find them and the shaft is not damaged (slight chance of that) then you can replace the bearings.
Tell me about how old the motor is, and the brand name of the unit itself so I can tell what type of bearings it has,
We can go from there