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Mac: Correct me if I'm wrong, but as I see this when you are doing other work, like loader work or just plain driving from point A to point B the hitch will settle a couple of inches then all of a sudden lurch to max height? Will it do the same if nothing is hitched to 3 point, and you have a situation whereby it is just the weight of hitch itself? On your draft control OFF will be in the far light end of range. If you had an original IH operators manual, you would find it much better on operating topics. IT manuals I find are more geared to repair and rebuild. My first opinion is the tractors internal lift cylinder is bypassing. I base this on the fact the hitch will go down in 2 hours if you leave it parked with disk up. I am also not sure this related to the lurching of hitch. The lift cylinder is the expensive fix, I like to look at the easy, non expensive items first. What happens if you leave the hitch down a couple of inches? I have seen the frame around lever get bent just a bit, thus allowing the operator to move the lift lever just a bit beyond its normal limit. Draft control if not working right can do some funny things also. Is this tractor upper or lower link sencing for the draft control. Most draft control problems are something bent or stuck. I presume you have tried every concieveable position for the levers. Does the rate on this hitch lurching change if tractor is running at low idle, then compared with say 1200 rpm? I'm thinking bypassing in lift cylinder should remain constant,(length of time it takes to settle the 2", I realize the upward lurch will be faster with rpm) whereas draft control problems will change with rpm change. While I say this it may not resolve anything. I do realize how annoying this can be, been there and done that. I've always been lucky in that it was something bent or out of adjustment. A couple hours observing will be a whole lot cheaper than tearing into that lift cylinder.
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