I own a craftsman 17.5 hp lt1000 after cleaning it changing oil etc. all of a sudden my shifting lever on my gear shift became harder and harder to shift. It is now at the point that i can hardly move it at all. Can someone please give me some advice on what a may try to fix this problem. I did recently make a brake adjustment because they were no longer stopping the mower. Could this have anything to do with it ? I welcome any suggestions. Thank you Rod