I have a 5410 4 wheel drive tractor with only 420 hours. Recently I have noticed a strange noise coming from the right front wheel. The noise is like a scraping or creaking sound, not a constant sound, but occurs once every wheel revolution. I have a front end loader attached and first noticed the sound when traveling with a full bucket of dirt. The noise is much more pronounced with a load in the bucket. Turning the wheel right or left does not seem to change the frequency or volume of the sound. Any suggestions?