I thought it could be something to that affect but when I replace the bearings the noise stops for a couple days...did yours do the same?
2003 Chevy Duramax 6.6 w/ 8'-2" BOSS V
1999 Chevy 6.5 Diesel 1 Ton w/ Dump and Western Plow
Exmark 60" ultra cut w/ Ultravac
2012 Redmax handhelds
Solo backpack sprayers
PermaGreen Centri Spreader/Sprayer