Hydraullic Valve Rebuild

[ihcc104]

Is it possible to "rebuild" one of these valves, if so, does anyone know how to begin, and what O rings are needed?

I god a back blade for my 154, and it leaks down in under 30 seconds with the tractor running, I need to figure it out, I can raise it up and switch the selector valve to the belly cylinder and the rear blade stays up just fine. Any suggestions?

[Eugene]

Under the spool, rod with a hole in the center, near left center of the valve, should be a snap ring. Remove the snap ring and the spool should pull out.

Parts book doesn't list the O ring size, but says there are 3 different O rings available in a kit.

Just guessing, the O rings are a standard size, available at most tractor dealerships.