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Message: <blockquote data-quote="mllud" data-source="post: 15720" data-attributes="member: 1012">That hum  because the sticks are very slightly opening the valve and that  fluid  is enough enter the pump but not enough to push it. Those pillow block bearings are cheap.I think when you get your linkages tight and the arms centered on the pumps . The hum should stop. It took me a while to get mine just right.I dont know if you still have a new holland. I could send you the procedure out of the owners manual.You have to adjust those linkages in a certain order. This keeps the sticks even with each other and the linkages so they push the pumps equally Mike</blockquote>