I have a K2 and at the end of today the cylinder for the traction drive variable speed is stuck and wont release. Or go back to slow. It's got the belt pulled very tight. It was good when I started. Hydraulics all work good. I took care of the spring/pulley issue on the trans earlier so I don't think that's the issue. And it's been fine. I'm going to tear into it tomorrow. I couldn't find a diagram on AGCO's website. Any ideas as to why this happened or what to look for?