Don't know if it's adjustable, but you are on the right track.
Sounds like the valve is not centering when released.
If you hold slight pressure on the handle, will it stop curling? And will it hold position with the engine off?
If so, suspect the valve.
If it wants to gravity creep (engine off) no matter the valve position, suspect cylinder piston seals.
Someone may have experience with that particular valve, but if you take it apart, probably find a broken return spring.
Just be careful that the bucket is fully down and sitting flat on the ground before breaking any lines loose. Don't interchange the spools or turn them around, work carefully so not to scratch or nick any surfaces, keep everything clean.
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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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