Ford 8n lift

I rebuilt the top of hydraulics new piston and o rings about a year or so it worked great now lift works as long as engine is running with lift handle is up shut engine off it goes down what is going on any ideas?
bad piston seals.
take off the side cover and have a look with the engine shut off.
How much water in the oil?
Maybe the issue is with the pump this time or the oring/backer failed. I would take off the side cover and have a look as well.
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With an implement on the arms lift fully up and tractor off look in the side cover and see where the leak is. Dripping from the top is the piston.

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