I have had problems with my 9600 header not lowering. The problem is worse after running and warming up. We have replaced most of the parts on the valve, just not the whole valve block (expensive). Replacing the o-rings and plungers and what not has helped but on occasion it still will not go down at will. Sometimes when it hangs up I have had to wait a full 20-30 seconds for the header to lower to an acceptable point to resume cutting.
Anyone else have a know anything about what might fix this, or is it just rebuild the entire valve block?