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|Gary Mitchel||We have a 3444 backhoe loader that is from the late sixties I believe. After the machine has been running for a little while the hydraulics lose power. We have drained and replaced the fluid, replaced the filter and pump. None of this has corrected the problem. Does anyone have any suggestions.
|Klaus||Probably you have an internal leak. I'd look at the pressure relief valve(s) (you probably have one in the loader control valve block and another one in the backhoe control valve block. Besides the relief valve(s) themselves, you could have worn out o-rings where the relief valves fit into their castings.
If you have 2 pumps, your second pump could be where you're losing the pressure (the flows add with the hydrostatic steering getting priority from the small pump).
How was the old fluid? If there was a lot of water in it you may still have a bunch of water from what was left in cylinders when you changed the fluid.
Rebuilding the two relief valves and replacing their o-rings made a huge difference in my 3514 with warm fluid.