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 I mowed with it.
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 not very intense. I don't know if it can actually be heard standing beside the mower. Sitting on the seat, it's definitely noticeable, but maybe as much felt as heard. I'll get someone else to work with me to confirm what I hear, and then back to the dealer.
Mostly I wondered if anyone else had experienced anything like this on a 3300 deck, or any deck for that matter. I don't want the spindles to be damaged and find out after the warranty is out.
I hear the oscillating hum in some of my neighbors mowers when they mow. If everything is smooth and not excessively loud and grinding sounding, I say run it. Grease all fittings if it has them also.
