Question about front end of my M923

[VF4 Smith]

My front end when turning left and only when rolling sounds like there is some grinding noise. Any pointers and a likely cause or where to look first? Im fairly new to working on my 5 ton and the mechanic I have access to doesnt know where to start on the suspension end of the truck. He can do anything engine wise. I have mechanic experience but not with the 5 ton. Any pointers would help like maybe a common cause. It only seems to be when im rolling no sound when i just turn the wheel. So tells me its something that spins on the front end. And only comes from front right.

 

[lindsey97]

Wheel bearing, or steering knuckle, or both. Time to grease and service/replace.