[rsquirrel]

Okay, I"m really baffled. I can start my 2520 up and everything works but when I put it in gear and have the clutch pushd in, I lose all my hydraulics like my power steering, brakes and I try to lift my bucket up and then try to put it down, it goes down about half way and then starts to gallop when I put it down then it won't go back up. I'm baffled because everything works when I first start it but when I put it in gear and have the clutch pushed in, I lose all my hydraulics. Any suggestions would help alot.

 

[Tx Jim]

Welcome to GTT
IMHO JD engineers made poor decision when they ""utilized duplicate model numbers for different size/type of JD tractors"".
With that being stated I'll guess you're referring to a 2520 rowcrop not CUT tractor. 2520 RC tractors have closed center hyd system with oil furnished to frt hyd pump by trans pump DUE TO FRT PUMPS INABILITY TO SUCK OIL. When equipped with Syncro-range trans & operator depresses traction clutch pedal the aforementioned trans pump stops pumping oil to frt pump then due to lack of supply oil frt pump cavitates. My guess is some hyd function has a ""large internal hyd leak"".
What type valve controls FEL(ind or scv)? If ind valve is it configured for closed-center hyd system?

 

[rsquirrel]

When I grab a hold of the pressure line from the main pump up front to the priority valve, you can feel it vibrating awful and it gets real warm. I guess the reason I grab ahold of it is because I am loosing hydraulics when I push in the clutch. I was trying to find a leak or something and I just happened to touch this line and it was vibrating awful. The other two don't do that so that's why I didn't think it was normal. any suggestions?

 

[Tx Jim]

As I previously stated I'll bet your tractor's hyd system has an internal hyd leak!
Only good method to diagnose closed center hyd problems is by performing ""good diagnostics"". Answering the simple questions I asked is a good beginning to solving your tractor's hyd problems. So I'll ask again.

What type valve controls FEL(ind or scv)? If ind valve is it configured for closed-center hyd system?