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Message: <blockquote data-quote="tomo1" data-source="post: 142971" data-attributes="member: 27718"><p>Low whistle. Seems to me I heard that type of whistle when my excavator was at a bad slope angle that disappeared when I corrected my angle. This is the same type of whistle, very low and faint but definitely out of the ordinary. And even cranking up the revs and the machine is sluggish. I can let it sit for an hour or two and then it runs fine for another hour. No obviously or anything that I've seen. Hydraulic fluid is up to where it should be. Thinking I should probably change the hydraulic filter.</p></blockquote><p></p>