Hydraulic Problems

[toddwulf]

Fortunately AFTER I dug my trenches, my 757C backhoe lost hydraulic power slowly to the point of nothing in just a few minutes. Interesting thing is, the front loader still works. Redirected the Backhoe line back to the 3 Pt. Lift and it doesn't lift either.

So I thought, perhaps one of the lines was clogged up, but it appears that there is pressure coming out of the manifold line that the FEL lines come from as well (How much I don't know). Fluid level appears to be fine so what am I missing here? Can anyone give me a pick list of items to go through in succession? Thanks in Advance TBN'ers.

Todd
Placerville, CA.

 

[jinman]

Todd, since your pump is the same for the FEL and the 3pt lift, It sounds to me like you have an internal pressure leak near your remote valve block, probably leaking back to the reservoir. The fact that the 3pt lift doesn't work is the giveaway that it can't be an internal leak in one of your cylinders or on the backhoe's control valves. It's very hard to troubleshoot without diagrams or previous experience. Hopefully someone with a lot more experience than I have will "chime in" here and give you some valuable advice. You did have the backhoe completely disconnected when you tried your 3pt lift, didn't you?

 

[toddwulf]

Further Diagnosis: After testing various things, The 3 Pt. Lift does lift if I crank it up to 2500 RPM's but even then it is not fast and can easily be stopped by hand. The backhoe works a little bit but not all levers and does not generate enough power to lift the main boom.

My thinking at this point is that it could be something as simple as changing the Hyd. filter, which I'll do tomorrow or it could be in the manifold or hose that services both the 3 Pt. and the Backhoe. We'll see.