3010 hydraulic line problem

The main line that runs from the pump to the valve block keeps loosening up. There is a o ring fitting on a steel line that attaches to the pump. This fitting is the one that is giving me problems. When the original line wore through, I replaced it with a hose and new fitting. When the fitting kept loosening up, I replaced the hose with a new steel line and new o ring fitting again. It still keeps loosening up after a dozen hours or so. Any advice? Thanks -Morgan
 
Are all the clamps securing the line? There should be two under the hood with hose clamps holding this line, two steering lines, and a line going to the oil cooler. Then there should be a clamp on the radiator to fuel tank support. chris
 

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