Here is a picture from the implement book I was talking about, dated 3-49. The more I think about yours Im guessing it is binding on the lifting roll when it completes the full stroke. I would try moving the lever to a lighter setting on the quadrant and see if that helps, which would only be probably half way on the stroke of the cylinder. When the hydraulic cylinder goes the full stroke on the lifting roll, the lever and linkage tilts slightly to the back and I dont think allows it to release. (for some reason I have two pictures of the same thing so you arent seeing double lol)
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