Beware 👿
I had an ARM 20 fail on me two weeks ago. Belt kept falling off the pulley when customer used the machine on a full programme. Went back to it 3 times, changed belt, checked main pulley for cracks etc.
On the third visit when tensioning the belt I noticed that the motor pulley was loose, it then came off in my hand 😯 .
Fitted loads in the past so it could be a one off but still one to look out for 😉