Dr.Bert, Your posts are similar to mine a few years ago when I was having the same issues.
Nothing worked as it should. I removed the top cover 4 times, rebuilt the round piston pump, replaced the gasket between the cylinder and top cover, replaced the cam follower, then make a larger 1/2 cam follower to account for all the wear, slop and flop in the control levers which were a rusty mess because moisture gets trapped under the lift cover. Ford's better idea, no vent in the sump.
The next time I remove the lift cover, I plan to totally rebuild all the moving parts of the control mechanism. The long spring part part of the draft control under the cover is bent. I could care less about the draft control working, don't plan to ever attach a plow to it. I'm more concerned that if I move the adjusting lever all the way up, the lift arms goes all the way up, the lift arms goes all the way down when I tell it to.
I bought a FOR SALE SIGN and put it in front of the tractor, so it knew if it didn't stop having problems, it would be finding a new home real soon.
If I knew then what I know now, I wouldn' have bought a Jubilee. I would have gotten a newer model with external hyd, live PTO and power steering. As it is I have twice the money in the Jubilee that I could ever expect to sell it for. So, I'll just have to keep it. Still have the For Sale sign for my tractor to look at.
Stay with it, learn how to remove the top cover and have fun. I rigged up an electric wench to lift my top cover with, rolled the tractor forward and lovered the cover on work bench.
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