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Message: <blockquote data-quote="12cjsuko" data-source="post: 136525" data-attributes="member: 25208"><p>Does the noise change with the engine at different rpm levels? My main concern, would be to make sure that the suction/intake hoses for the pumps aren't pinched, causing low flow from the reservoir to the pumps. The other thing we have come to find out about these skidsteers, is that the coupling from the engine to the pumps, is an exposed chain coupling, that will get noisy, if it doesn't have any lubrication. We spray our chain coupler with motorcycle chain lube about twice a year, and that has helped with the noise, and failure of the coupling. If these things aren't causing any issues on your 4400, that might be the way it sounds.</p></blockquote><p></p>