polaris took a sh*t on friday, was riding around the yard getting ready to load onto trailer when it just stopped. felt like it hit a wall. Engine still runs, but track won't turn, forward or reverse. Acts like it wants to move after giving it a little throttle but sheave will only move about an inch. checked chain case and chain is still in one piece with plenty of oil. Nothing up inside the track, sheaves are clean and a new belt on. Any ideas? thanks