Hey folks, I'm hoping y'all can shed some light on a problem I'm having with my 72" SP2800 Dixie Chopper. I replaced the blades yesterday with a much heavier duty version. They fit fine, no issue there, but the new ones do weigh quite a bit more than the old ones. I get to mowing and the 2 outer blades aren't spinning as fast as the middle one. It only got worse, to the point that the two outer blades really weren't cutting. So this tells me the deck belt is slipping, so I go back to try to tighten it up some - perhaps the added weight of the blades is causing a problem, I don't know. Anyway - I tighten it up as much as I can and it makes no difference. This is when I notice that the pulley on the middle spindle that is for the belt that goes back to the engine spins relatively freely from the pulley below it, that powers the two outer blades. SO - I tighten that up as much as I can. Start her back up, and all 3 blades are spinning like crazy, so I figure I'm set. I finish my backyard when the drive belt comes apart on me. At first, I figure this thing had been slipping so much and was burnt up, so it was ready to fail already, so no big deal. I had a spare swapped them out, kept going. When the spare burnt up, I figured I had done something wrong. So finally, to my question - is the pulley for the engine belt SUPPOSED to have some play in it? That's the only thing I can think of. Right now, it doesn't give at all, so I'm guessing that is burning the belt up when the blades get bogged down or whatever. Either way, how do I adjust this thing?? Too loose and the blades don't spin fast enough to cut. Too tight and the belts get destroyed. I clearly don't know what I'm doing, so I don't know where to go from here. All help is appreciated.