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Fruita CO | The easiest way to find a high-pressure leak is to start it up cold & feel the hyd. components & the return lines off of them. A valve with a leak will start to get warm in a few minutes. Sometimes you can hear a squealing sound in the valve, most noticeable when you shut it off. If the main pump has a destroking screw, turn it in & listen for the engine to unload. A high-pressure leak will cause the pump to stay in stroke & load the engine.
Diff. lock valve can be the problem too...if you suspect a component, you can cap off the pressure line to it & see if it makes a difference.
Edited by ronm 12/23/2014 07:42
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John Deere 4020 hydraulic problem
