1st: If the pto shaft hit's the deck when you raise the lift, the top link is to long allowing the mower to tilt back to much.
2nd: I haven't seen it happen with a brush hog but with lighter implements when the pto shaft binds against the deck or frame it causes the implement to pivot pushing the top link in against the draft control spring, once this happen the lift is going to raise uncontrollably and the only way to stop the lift from raising is to shut the engine off.
3rd: To possibly get more answers it's best if you post this problem in the Ford section.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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