The hitch control valves are in a housing atop the RH side of the rockshaft housing. The valve is NOT shown in this drawing, but it would sit on the rectangular area at a slant, in the foreground, with the 8 mounting holes visible.
The factory shop manual will have detailed instructions as to how to narrow down the problem to a specific component.
WHATEVER you do, don't mess with the valve on your own, DEFINITELY NOT without a factory shop manual "at hand"!
The lift piston is accessable though the cover at the back of the housing, shown to the LEFT of the drawing, There is also a "thermal relief valve" in the piston cover, and they have been know to leak, allowing the lift to settle.
So there you have it.
1.) Possible bad lift piston seals.
2.) Possible control valve porblems.
3.) Possible thermal relief valve problems.
How long IS the lift staying up after shutdown, with significant weight on it?
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