JD 9250 Backhoe on 350C crawler loader

Hello, I have a 9550 on a 350C crawler loader, My problem is the control valve for Left/Right swing sticks and I have to wiggle the level to find neutral.

When I got the unit I drained the hyd system, it was very dirty with crud from condensation. I cleaned the tank, filled with cheap hyd fluid and ran it and drained again and filled with JD fluid.

I am wondering if there could be crud suck in valve and how to clean it out.
If I have to replace valve does any one know if I could use a valve fron a 310/410? The JD online parts books are not clear. I may have luck finding a used value if I could identify which one it is.

Anyone's ideas for a soultion would be great
 
The valve has a spring to hold the spool in the neutral position,the spring may be broke or the retaining bolt loose,the spring will be located at the bottom end of the valve,screw off the cap,its at the opposite end from the lever and see whats wrong in there,if you need to remove the spool disconnect the lever from the top and the spool will slide down and come out the bottom.
AJ
 

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