I've noticed that the loader will not keep the tractor off the ground. The FEL stay raised OK with a load, but the tractor will drop to the ground in a few seconds if I lift it with the loader.
After looking at the parts diagram for the SCV, it appears that all the O-rings in the unit are there just to keep fluid inside the valve and leakage within the circuits of the spool valve is contained only by the clearance between the valve and its bore. I am going to rebuild the lift cylinders soon since the parts were cheap and I doubt they've ever been rebuilt.
But assuming the issue is the valve, it looks like there is no fix for this problem beyond replacing it. At $600 or so for a new one, if I can find it, I'm inclined to live with the problem.
So 2 questions:
1. Am I correct in that there no way to fix the valve?
2. Hydraulic parts are pretty standardized. Has anyone ever adapted another valve to this application? At least, one that doesn't cost $600?