Thanks for the thoughts. It's not motorized-it's a seated recumbent cross trainer for rehabilitation after joint replacement. I tried the silicone spray but it made no difference. Then I noticed the belt was really tight so I reduced the tension and it solved the problem. I'll see if it lasts.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT