I have owned my B7500 for just over a year now. It has about 630 hours on it. This spring I started noticing a whinning type noise coming from the front right tire area. Mostly in 4 wheel drive but does it to a lesser extent in 2 wheel. Takes a little time of use before it starts and can be not happening at all when the tractor is on different and or changing grades. Any ideas what might be causing this? Thanks for the help.