IS2000 ZTR sudden smoking bad

Was going along mowing a customer when all of a sudden mower starts smoking. So bad that I thought the damn thing was on fire!! Been very warm and very dry believe it or not up here in Syracuse. Checked it over, found nothing unusual. Re-started the mower and starts to smoke again. Even with the damn mowing deck disengaged!!! The smoke smells little like rubber burning but also chemical-ish smell. Any ideas of what belt or pulley may be turning on a ferris just sitting idle? I believe the hydro-fans run all the time? I don't know. I need help fast because I got customers waiting. So please, any ideas ,let me know.

Thanks so much



Jake