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Message: <blockquote data-quote="Tazza" data-source="post: 3458" data-attributes="member: 82">It won't be your relief valve if your hydraulics still work 100%. It sounds like a blocked filter in your hydrostatic system. I'm not too sure about this machine, but i suspect it is clost to my 731, there is a hidden brinze filter in the charge line going to the hydrostatic pump. Lift the cab off, there should be like a square block sitting on the hydsraulic pump with like 5 hoses atached. On the left side there should be 3 hoses, remove the moddle one, it has a larger nut on the fitting, there should be a filter behind this, give it a GOOD clean or replace it.Like i said, this is where it is on my 731, i am un-sure about your 520. If you have a parts manual, have a look at that section and see if there is a part hidden in that block.If the machine squeels like a stuck pig when warm, it sounds like thats your problem (mine did the exact same thing when it got warm).</blockquote>