Don't know how old your tractor is but my last one was a 2017 model. There was some popping noise in the front axle. I kept using it and the wheel came off. I had to put in new bearings and seals. The problem is the snap ring or C clip comes loose and then the axle can come out. When it happened on the other side I caught it before the axle came out and it didn't damage the bearing.The new c clip was different, it didn't have ears on it and fit tighter in the grove. I had to cut the grove in the axle a little deeper with a cutoff wheel. The new tractors should have the upgraded c clip.