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.
![](https://molia.org/wp-content/uploads/2021/04/autopilot-drive.jpg)
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…
![](https://molia.org/wp-content/uploads/2021/04/A18083-768x1024.jpg)
I ordered a new belt from ebay seller astra610s part number A18083.