I believe they usually mounted them "fixed" end or bottom of cylinder to stationary end of the lifting roll, then the hydraulic hoses are kept stationary and dont move. They used a take up spring on the hoses which was hooked on the carburetor pipe on the Zs and on the intake manifold on the Us. It has been a while since Ive had mine mounted on the lifting roll for the cultivator but I believe the hose on the bottom or stationary end of the jack goes to the left side of the connecting block on the back of the tractor. That is the way it is on my ZA I believe. I think you are correct, forward is up and back is down as that would work for the depth control. Ill take a look in the manual to make sure.
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