My drive wheels are both frozen. this is a 1993 woods mower. I have been good about maintaining this mower. I cannot figure out what happened. I drained the tranny fluid and found no metal shavings in it. I checked the brake and it seems to have disengaged itself. The wheels are just locked up. There is a right and left side transmission tower. Both wheels will not move. Everything else is working excellent, it is just the drive wheels that have quit. Please help! Any advice on what the problem might be?