John Deere 6110 hissing sound stuck valve.

[Alaskanassasin]

Title says it all.
I have a 6110 jd with a 620 loader. It doesn’t seem to matter if I use the loader, or steering wheel, quite often a valve is sticking somewhere in the back making a hissing sound. If I wiggle the loader it releases the pressure.
Any idea what to take apart and clean?
Thanks

 

[mert1925]

I recommend lubricating rather than cleaning. 🙏

 

[Alaskanassasin]

I still have not worked this out. Aside from taking it to the deere dealer I am stumped. It has to be a spool or something sticking.