Was using my 773 last night and had it parked. I got in to move it and the wheel locks would not disengage. Bucket works fine. It has a panel of lights behind the seat and all are on except the traction lock light. The wonderful owners manual tells me that if this light is off you cannot move forward or backwards. Thank you Mr. Obvious. I can't find anywhere that tells me what is supposed to turn the light on though. I was reading about the traction lock override in the manual though. It said it allows you to drive the loader while not in the seat (for backhoe use an such). So I stood in the bucket, pushed the override button, and proceeded to drive it back to the barn. If I get in it though, it will not release the locks. So I know what ever releases it is working fine, I just don't know what tells it to release if I'm in the seat.