MSW Motor Technics MSW-MBS680H Manuel D'utilisation page 34

The most common symptoms of worn carbon brushes are loss of power,
sparking, smoking and/or a burning smell.
To replace the brushes:
• Disconnect the machine from the power supply.
Disassemble the rear engine casing by unscrewing the 2 screws
•
holding it:
• After removing the back housing, you can see the carbon
brushes at the motor rotor - to get to a single brush, use a flat-
tipped screwdriver to unscrew the cover holding the brush and
remove the worn brush: