hydraulic issues with loader

[gmoorefield]

I have a 85 JD 1050 w/ loader and backhoe attachments. My problem is with the loader bucket. After possibly overloading my loader by chaining a over size rock to the bucket and dragging it , now my tilt back and my lift is very slow and weak. If you get a bucket full of dirt it has a hard time cupping it back and you have to run rpms way up and it lifts it very slow. It doesn't leak off once you get it raised and it works fine empty. The backhoe attachment also still works as it should. Changed filter, fluid and cleaned screen in sump which all looked OK. Took selective valve apart and replaced all orings which also looked OK. As far as I could tell everything inside looked good but I am not a hydraulic specialist by far, just can't afford to have someone else fix it. Loader has never been super strong but there is deffinately something wrong now. Thinking a relief valve stuck open but don't know where to find that. If it were one on the main system, seems like the backhoe would have issues so I'm thinking its got to be in that selective valve. Please help. In the middle of a project and I need my tools..... Thanks in advance.

 

[s219]

You may have bent the cylinders and/or damaged the internal seals by doing what you did. Hydraulics will not go into relief if you overload them with an external force, which is why it's bad to apply significant forces to a front loader bucket using other than hydraulic forces.

I'd suggest extending the cylinders and check them carefully.

 

[LD1]

I agree that you could have damaged the internal seals.

The loader will NOT leak down even if the internal seals are shot. The main symptom for failed lift cylinders seals is lack of power and loss of speed.

 

[Zebrafive]

You can confirm its the cylinders and not the valve by swapping the bucket and boom cylinder hoses at the quick couplers. If the bucket still is weak time to rebuild the cylinders.

 

[gmoorefield]

You can confirm its the cylinders and not the valve by swapping the bucket and boom cylinder hoses at the quick couplers. If the bucket still is weak time to rebuild the cylinders.

I will try this, but it is my bucket as well as my boom lift. No signs of leaks in the cylinders. When you say internal seals are we talking in the cylinders or main hydraulic system?