580C trainnie problem?

Went to get on my hoe this morning and got a problem. It is not going into reverse. Like it is binding up. I check all oil levels, good. Checked the linkage, good. It will go into forward in neutral. I even lifted up the hoe on the bucket and back stabilizers. Tried again. It's like it is binding when I shift it into reverse. With the hoe off, I can spin one tire and the other side spins the other way. So, my thinking is that it is something in the trainnie.

Any ideas as to were to start to fix this? I need to get this thing fixed ASAP.

Thanks.

580C trainnie problem?