Yep, that's a Uniforest!! Somebody posted a better manual a while back. I can't remember who or where, but if I can find it I"ll post a link.
It's working just as it's supposed to, from your description.
Who did you get your winch from? If by chance it came from Hud-Son, on this side of the border you will find they are very helpful with any problems you have. Just don't make the mistake that I did and try to adjust it without knowing what you are doing. I messed it up and will probably never get it right.