Sorry I didn't get back when promised with an update. With my wife's help setting on the lawn tractor and the drive belt for the mower deck removed, I had her engage the mower deck drive and confirmed the drive was spinning when engaged. I pulled the mower deck again and quickly figured out...
Yep, the last time I mowed I ran over an area beside our new pole barn that was pretty well overgrown. Unbeknownst to me the builders had left some heavy electrical cable there and I caught it and it wrapped around the spindles. When I had the deck off to get the cable out I didn't notice...
While mowing a few days ago I threw the mower deck drive belt and had a really strange noise coming from the mower deck. Pulled the deck and found the center pully assembly broken off. Replaced it and all three blades, re-installed the deck and when I engage the deck drive I just hear a click...