Agco 5650 high gear will not work

I was driving it down the road with the Haybine and high gear. And she locked up like somebody was slamming on the brakes motor stalled and everything. Switch it down and low gear move just fine. As soon as I get it back over here, I’m going to tear into it, but I’m just wondering if anybody else has experienced this problem ? And if so, do I have to split the whole tractor to fix it or some easier way to do it?

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