Hey, Ive got a problem that I am unsure about. I have a Kubota B7200. Ive had it for years. About a year ago I noticed the left wheel and hub had slid to the outside. It wasnt far from coming all the way off. I found the issue, a missing pin that kept it from sliding. I bought a new pin and re-aligned the hub. I tightened the wedge bolt. Later I found the pin was gone again. I dont think the pin is just falling out. The last pin lasted less than 2 hours of use. I have replaced it 3 times now. Should I be looking to replace the hub? can I replace just the wedges that tighten against the axle? Could the Axle be worn to the point it will not hold the hub in place? Any advice is appreciated