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That's sort of what I was thinking, but I'm no engineer or mathematician. I thought maybe a weak spot in one of the belts builds up to a tightness and then relaxes, or something like that. The dealer was at my place once and listened briefly, but as usual with mechanical malfunctions, it was...

New member. New Ferris 3300 w/ 60 in deck. Deck noise/intensity cycles about every 20 seconds from smooth to higher intensity/noise. Same while mowing or sitting still. Sometimes difficult to notice, other times more noticeable. Dealer demo had 15 or so hours on it, but I noticed first time...