Contaminants in the lubrication is my 2 cents

https://www.schaeffler.com/rem...g_failures_us_en.pdf

Dave

bfran21 posted:

this bearing came out of a belt drive toyo pump. vibrations were showing BSF with sidebands of FTF, gSE spectrum shows it the best. I was hesitant to make the call for this reason since it wasn't showing to much in the velocity spectrums. not sure if it was to early to make the call or not? would this be an example of bearing skewing or smearing?

This sign of smearing 

According to iso 15243 resulting by poor lubrication and light load

Here is another set of bearing from the same style pump that I just wrote up for showing the same vibration signature BSF with sidebands of FTF

bfran21 posted:

Here is another set of bearing from the same style pump that I just wrote up for showing the same vibration signature BSF with sidebands of FTF

It seems false brinelling due to  vibration from an external source while stationary .low preload and poor lubrication also can be cause . 

looking into lubrication bearings are oil bath using ISO 150. endplay was set to .008

https://www.timken.com/pdf/589...lysis%20Brochure.pdf

Page 19-20 discuss false brinelling, text describes in detail what to look for, I would have anticipated the inner race to also display brinelling

page 8 debris in lubricant

Dave