This tractor was running beautifully. Idling away, happy as can be. I fixed the Char-Lynn hydraulic pump on the back, raised the loader, was driving it around the field, and it ran out of gas. Filled it up, and it got stuck in second gear and lugged the engine down. Got that freed up, hit the starter, it popped, fired, and stopped. Hit the starter, nothing. I thought the battery might have gone dead because I'm not sure if the generator is working, so I put a charged on in, still nothing. I decided to try the hand crank, and it was seized up so tight I could jump on the crank and it wouldn't move at all. What happened? What do I do? I've NEVER had to deal with a stuck engine before. HELP!