Hi Martin and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, are you considering a DIY (do-it-yourself) repair approach? More importantly, would you be comfortable working on the inside circuitry and mechanism?
If yes, do you have access to and familiar with a multi-meter and even perhaps a soldering iron?
Can you please provide a clear / closeup picture of this motor? Click HERE.
I understand Martin.
Still, please describe further "...motor does not operate...does engage..."
If voltage is present to the motor wiring, then yes, a likely mechanical issue. Please try soaking/cleaning the drive spindle with WD40 or equivalent.
I understand. In most instances it would be a failed belt something like the part shown HERE.
If it were mechanical/motor, then cleaning with plastic safe / non-staining CRC 2-26, DeoxIT DN5 or LPS 03116 Contact Cleaner or equivalent particularly the sleeve bearing of the spindle as well the carbon brushes and commutator segments can also be attempted. Alternatively WD40 may be used also for soaking.
In some other instances, the electronic speed controller may be the culprit.
Or in less often times, a low or missing B+ supply to the motor circuit.
Yes please; would look forward to an update when able.
Sorry but I only receive credit when the customer has provided a Positive Rating and/or an Accept. Doing so now, does not close this question thread and would allow followup posting(s).
Sorry but direct contacts is treated as Premium Service by the site which involves additional fees.
Alternatively, try dropbox, imgur or even photobucket or the likes.