We have a Raymarine ST4000+ (aka Mark 2) autopilot on Molia. This was not working reliably last season.
To get to the autopilot, I first had to remove the wheel. Once the wheel is off, the autopilot wheel drive unit unplugs.
The instructions say to replace the drive belt if is damaged.
Having removed the support plate from over the clutch rollers (2 screws), I saw that our belt had a loose string, and there was lots of fluff in the drive! Time for a new belt…
I ordered a new belt from ebay seller astra610s part number A18083.
March 1, 2021
Job completed, autopilot and wheel refitted.