The fault you have is not in the unloader & flow control valve as it is still there when u pull the aux valve lever to dead end the oil supply. At that point oil can only go 2 ways, to hitch cylinder to lift if draft valve is in lift mode , and to blow the main R/v and pass to return.
There is a problem with the linkages in the hydraulic top cover, it may be a circlip off or more likely the sensing beam and spring have become detached from their mounting pegs (hook end of spring may have broken off !! and as such the walking linkage has gone out of balance !!
To check, just rear of unloader &flow assy is a metal plate with the breather on it, remove this and you can see the linkage that operates the draft valve, operate the draft lever from full lower to full raise & back to lower again. (Engine stopped !!) and you should see the spring expand and contract. if it does then its a circlip issue, if it doesn't its a broken or detached spring.
Some skilled mechanics can replace spring through this plate but its very fiddly. Official way is hydraulic top off, replace, bleed brakes etc, allow about 12 hours labour.
I need your e mail so i can send document that shows the linkages!!
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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