Welcome to OCC!
I don't know much about newer cubs like the 1641, but the site has a great reference section containing everything from owner's manuals, wiring diagrams, part references, and even some how to's for almost any model or implement. You can find it about halfway down the main page or here is a link to the manual section.
https://www.onlycubcadets.net/forum/...f=19&order=asc