Hi from retired Englishman in SW France,
This sounds very much like the belt is broken or, at worst, the motor is malfunctioning. Belts are not expensive- sorry I do not know how much yours would cost- and are easy to be changed by a competent person:-
REMOVE POWER FROM THE MACHINE AND REMOVE THE BACK.
The motor support bolts should be loosened and the old belt removed. Often putting the new belt on is a bit of a struggle, even with the motor 'loose', because it is new and smaller!
Once on it should be tensioned by pulling the motor against the belt firmly- but not over tight- and the motor support bolts tightened.
ON NO ACCOUNT SHOULD ANY FORM OF LEVERAGE BE USED TO TENSION THE BELT. THAT COULD LEAD TO DAMAGE TO THE BELT, MOTOR AND BEARINGS- EXPENSIVE!
If it turns out to be the motor, it is false economy to just have the brushes changed although financially very attractive. Experience of others is that the brushes may only last months unless, that is, the motor is totally refurbished at the same time. It depends on how old the motor is and how much wear the commutator has had.
Hope this is your problem solved.
Good luck,
John C
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