I have a Raptor with flip up deck. The mower is brand new, 15 hours, blades not used and deck has no scratches. This thing has literally never cut grass, it was a demo unit. When I bought it without being able to drive it (auction). I got on to drive it to my trailer and it fired up perfectly, went to drive it and only the left wheel moved. I assumed parking brake had not disengaged, so I pushed the handbars back out and then pulled them in again, no luck. Left hydro works perfect right wheel is locked up (but makes noise like hydros are trying to move it). I ended up just reving up the engine and slamming the bars back and forward and again and finally broke the thing loose and it drives amazing. Parked it and went to unload it later and it was stuck again. I have checked to make sure the parking brake isn't being told to engage by the safety sensors. Not sure what else could be causeing this problem.