This is a problem with your carbon brushes, remove old brushes, and check they have not become jammed in there brass sleaves, they are spring loaded.
If they are not jammed but less than 20mm new brushes are required, available from most good vacuum stores.
Before purchasing spin the motor, and feel that the copper commutator, where the brushes contact with, is not buckled (not even slightly)
NB Buy genuine Numatic they go back in better.
Independent Experts
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