I agree it may also be a valve stuck between single and double acting; did you mess with those though?
If not, you may have an air pocket in the system that needs worked out. Easiest way it to take the air breather off the top of the reservoir and pressurize the system with a little shot of air from a rubber tipped blow gun. Only need like 15PSI and with the tractor running it will go ahead and push the air pocket out.
If that does not fix it, in the pressure regulator block, there is a small screen; it it about 2" long and the diameter of a pencil. If that is clogged, or collapsed upon itself, it will cause the symptoms you are having...
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