Decreasing Thrust Load by Lubrication

[panix001]

I was told that lubricating the interface of a thrust roller and kiln tire with graphite would reduce the thrust load since the source of the load in the traction. I need some help understanding this concept.

Thanks.

 

[panix001]

http://feeco.com/wp-content/uploads/2012/07/Rotary-Drum-Alignment.jpg

Picture of scenario.