The shaded pole motor has bronze bearings that wear out, when the wear it allows the magnetic field that drives the motor to pull the stator against the armature. Since the magnetism is able to pull the part that is supposed to turn against the part making the magnetic field that makes it turn they stick together when electricity is applied. The hum means the motor is not turning. The only option is replacing the motor, or making new bearings for it if you are skilled to do it.
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The shaded pole motor has bronze bearings that wear out, when they wear it allows the magnetic field that drives the motor to pull the stator against the armature. Since the magnetism is able to pull the part that is supposed to turn against the part making the magnetic field that makes it turn they stick together when electricity is applied. The hum means the motor is not turning. The only option is replacing the motor, or making new bearings for it if you are skilled to do it..
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Take the motor apart and check to make sure the bearings are stiff in the mount first. the motor end caps have packing in them you can use a light weight oil like sewing machine oil to saturate the packing, it will keep a good supply of oil to make it last.
The shaded pole motor has bronze bearings that wear out, when the wear it allows the magnetic field that drives the motor to pull the stator against the armature. Since the magnetism is able to pull the part that is supposed to turn against the part making the magnetic field that makes it turn they stick together when electricity is applied. The hum means the motor is not turning. The only option is replacing the motor, or making new bearings for it if you are skilled to do it.