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Message: <blockquote data-quote="Hotrod1830" data-source="post: 106516" data-attributes="member: 4331">Does it change when the hyrdo levers are pushed forward/backwards? If it does, look for loose linkage. If no, run a pressure test on the hydraulics. A pressure gauge on the aux. port will do. Make sure it is putting out the correct pressure. If not, check for air intrusion, damaged pressure relief or pump. Chances are, they changed the filter trying to fix the noise.You need to isolate the source of the noise. You an use a long screw driver or prybar and use it as a stethoscope. Find out where the noise is coming from. Pump? spool valve?</blockquote>