The way you describe the plumbing, you have a CORRECT two-way hydraulic setup. Your 3pt will power up and power down.
All you need to do is secure the Liftall lever back so that it is providing pressure. Hooking that nub on the lever should work, but maybe the linkages are worn. How much further do you have to pull it to make it work? Maybe weld a piece of key stock on the rod to take up the slack?
A bungee cord could be used to hold the Liftall lever back, or you might be able to secure a small hose clamp on the rod to hold it pulled back, but beware if you have to force it ahead for some reason, you won't be able to.
You will need to use collars on the cylinders to limit height. There is no position control available, unless you sit down and design it yourself. It drops down because you have a leaky christmas tree valve.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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