Raymarine Autohelm ST4000 MK1 Autopilot Wheel Drive
I acquired this used but working wheel drive and decided to re-condition it rather than let it clutter up the shop.
I opened it up and -
cleaned & painted
lubed (only where recommended)
replaced the drive belt with new one,
replaced the main drive motor sprocket
Dissassembled, inspected the motor main gearbox (to confirm the 22 planet gears were good)
Tested drive motor (strong motor)
This would make an excellent spare or a direct replacement unit.
Price is $214.50 plus shipping paid via PayPal.