Hi from retired Englishman in SW France,
This sounds very much like the motor IS failing. Following are my pre-typed general guidance notes and include a comment about changing brushes- sorry!
Motors- and belts, which is sensible to change at the same time- are easy to be changed by a competent person:-
REMOVE POWER FROM THE MACHINE AND REMOVE THE BACK.
The motor support bolts, normally 2, should be loosened and the belt removed then remove the bolts completely
With the motor it is false economy to just have the brushes changed. Experience of others is that the brushes may only last months unless, that is, the motor is totally refurbished. Refurbishing includes skimming the commutator on which the brushes run. Without skimming the brushes do not sit firmly on the commutator but straddle it- the centre is often more worn than the outer part.
Unfortunately motors are not cheap- the motor for our 18+ yearold Bosch cost GBP250 but it will probably outlive us!
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 this has assisted you please consider a 4 thumbs up for the rating.
Thanks and good luck,
John C
Testimonial: "Think I will get a new machine as motor is expensive . Thanks for advise"
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