Deere 6420 300 series rear SCV rebuild help requested

[NoMidMO]

I have a Deere 6420, with 300 series mechanical SVC’S, used for disking and brush cutting.
Remote #2 leaks down. When a mower or disk wing is raised up and stopped (NOT float) it will gradually drop down. Quick connects –do not leak-. I have swapped #2 with #3 hoses and the leak down stays with #2.
I’ve decided to REBUILD #2 SCV.
I would appreciate any help/instructions on how to go about it and what to avoid.
OR if someone feels I have misdiagnosed the problem, let me know.

 

[oldnslo]

There really isn’t a rebuild to stop leakage on directional valves since all the port sealing is metal to metal tolerances between the spool diameter and housing bore. What might have happened is something has changed in the centering spring mechanism so the spool is not returning to true home position.