Weak Hydraulics on 310A backhoe

[onalaskahoe]

Hello all.
I just pulled the destroke solenoide for the main Hydraulic pump on my JD 310A backhoe. I found that I can blow through the closed valve slightly. Could this be the cause for the low pressure and slow hydraulics on my machine ??

I think I might have found the problem, let me know what you think, and tell me how this would cause the slow and weak hydraulics?

Chris

 

[Roy Suomi]

Go to your local friendly Deere dealer and purchase a "test plug"..from a pump front cover..This plug goes where the solenoid came out from the side of the front cover..This will eliminate any guesswork..

 

[onalaskahoe]

Thank you.

Do you know what the price may be? Or does anyone know a part number for this plug?

 

[Jonathan in MA]

The p/n of the plug is AR90378. Deere suggested list looks like $28.75.. that may vary by dealer. If you can track down a Deere mechanic, a good one anyway.. he'll have one in his box that you can borrow. They come installed in new pumps and are removed if a destroke solenoid is installed.

 

[onalaskahoe]

Thanks to all...

I have the test plug on order, it is $40 but I can't yell about that. I know the Solenoid valve is leaking and I think that any bit of a leak at 2200 psi will be shutting down my pump from loading.
I pulled one piston and see that the pump bearing is clean and clear so the pump is not galled.