I do volunteer work on lawn maint eqpt at our church and Elks Lodge, as well as maintain my own four garden tractors. Got a report today that a big Lesco ZTR (model 707207) I maintain had "some kind of deck problem". The report was right. I got by the eqpt shed today and checked it out. Everything looks good; belts OK, engine runs fine, etc. What happens is when I pull the PTO switch, I get a loud "clack", but the blades don't spin. I believer the clacking noise is the PTO coil sucking the rotor in, like it should be doing when power gets to the coil. Now I'm wondering if maybe the rotor is cracked or something so that it goes up an down, depending on whether the PTO coil is energized or not, but it doesn't engage the deck pulley as it should. Any thoughts appreciated. Looks like I may have to drop the deck and put a new PTO in. Sure hope not.