Hey all! I have a 770 Row Crop that was working fine today for about an hour. I have a pull behind grader that I plow snow with. After plowing I decided to put chains on the tires... After I got them on I took the tractor around the driveway to seat the chains so I could tighten them up. I got about half way around and my right tire locked up. I can make a full tire revolution each way until the tires locks up. I have not applied full power to it but I know its locking, then differential want to spin other tire... The tire rotates fine with no binding within that revolution... 

Anybody have any ideas?

Thanks!