I have an exmark turf tracer hp 52" Its about ten or 12 years old. MODEL: TT5217KAC SERIAL# 300671 I was mowing along today and the mower stopped then wouldn't move. runs fine, but no movement. I looked underneath the mower, and the hydro drive belt seemed way to loose. then I found a big tensioner spring on the ground. I'm assuming I just need to reattach the spring, to tension the belt but I can't figure out where it goes, and I can't find a good diagram anywhere I checked the user manual and parts manual on exmark.com but the diagrams didn't really help Anybody have a link to a good diagram of the hydro drive belt, idler arm, etc? Or an explanation of where the tensioner spring goes? Any guess on why the spring came off? Its not broken or worn. Thanks in advance.