New Holland 555E Hydraulic pump stalling motor on start up?

[Rusty Rudder]

If this has been discussed, please forgive and direct me to the thread, thanks in advance !

Purchased my '99 NH 555E recently with 6000 hours. All was well for the first 15 hours.

Now, the engine will not start unless I am deflecting one of the loader valves, up/down/bucket.... engine starts. Let off on the bucket control lever and engine is stalled by what sounds like the hydraulic pump deadheading.

I can keep it running by actuating the loader controls and raising the rpm's and the engine will continue to run even after letting off on the bucket controls but, the engine labors to continue to run. (While operating like this I loose steering hydraulics occasionally ....)


I am wondering what component would or could most likely cause this and where it is located ?

 

[Billrog]

One of the stabilizer controls isn't stuck in the up position is it ?

 

[TractorGuy]

Try operating all the controls on the loader, backhoe, and stabilizers to see if any feel stuck.

 

[Rusty Rudder]

I'll check ! I was in a muddy quagmire of a mess, stuck, using every control I had to get out... Something could have stuck and I did not realize it. thanks !

 

[Rusty Rudder]

Back from the shop, none of the controls are stuck, all in natural
position and move freely....

 

[TractorGuy]

Sent you a link through PM. Use the download option near top right to save to your computer.

 

[Billrog]

It would be good not to run your machine with the pump being dead headed .

 

[Rusty Rudder]

It would be good not to run your machine with the pump being dead headed .

Agreed, I have only run it to test the changes I am making work or do not work, brief operation at best...



Leaning toward a stuck rear pump main relief unload valve ?!?

 

[Dave M7040]

Agreed, I have only run it to test the changes I am making work or do not work, brief operation at best...



Leaning toward a stuck rear pump main relief unload valve ?!?

How about an improperly seated quick connector? If you have them suggest you re-seat them.

Dave M7040

 

[RickB]

Sounds as if the unload valve is sticking closed.