420 hours, replaced belts about 6 months ago, and everytime I engage the Pto I am hearing a whining/squealing noise which sounds like it is coming from beneath my feet around the center spindle. This has been going on for about the last 40 hours of operation and cannot figure it out. It seems to squeal a little louder when going into heavy grass and never really stops until I disengage the PTO. I have had replaced all the idler pulleys to no success. I checked the spindles for free movement spinning them without the belt on and the only thing I found was that the center spindle has what sounds like a short slight rub once every full revolution, so before I go and spend money to replace the spindle I was wondering if it could be anything else? I also researched the entire website for the last two hours reading posts but could only find something about the belts possibly making noise and someone suggesting spraying WD40 on the belts, but I would think that would call slippage if nothing else. Any help greatly appreciated.