john deere 4255 with 280 john deere loader problems

[banditman]

Would some pictures help?

 

[Tx Jim]

Picture is worth many words. I'll suggest to temporarily plumb around(by-pass) that relief valve and carefully operate loader.

 

[Zebrafive]

According to JDparts.com there are no service parts furnished for these relief valves.

I would still take it apart and see if anything is holding it in the relieved position or if it need to be freed up as in rust or corrosion.

 

[Zebrafive]

No the hydraulic pressure has not been checked. Im not sure what valve controls the tractor has. There are 6 normal female connections and one smaller female connection on the valve body that all the hoses from the loader hook into. The tractor just has the normal john deere loader joy stick with the graple lever. Yes it does have a self leveling bucket.

Any possibility some of the six larger hoses got mixed up? The small female connector is the drain to sump for the relief valve.