yellow grease
yellow grease
(OP)
Hello folks,
I just breakdown a spindle. On one side the grease (NBU 15) was white, which is the initial color, but on the other side, the grease turned yellow. Does someone know why? Overheating?
Thanks,
I just breakdown a spindle. On one side the grease (NBU 15) was white, which is the initial color, but on the other side, the grease turned yellow. Does someone know why? Overheating?
Thanks,





RE: yellow grease
You may have caught this at a good time.
After say that I've have seen greases with color indicators that tell one when to change the lubricant.
I would also check the manual to see if the proper grease was used and if they may have used two different lubricants.
RE: yellow grease
Was the discoloration towards the seal side? Did the bearing fail in some way, necessitating the rebuild?
RE: yellow grease
RE: yellow grease
Just thinking out loud, if the discolored grease is toward the seal, and not really extending close to the bearing, I'd wonder what snuck in the spindle nose.
I' be looking carefully for a local high spot under the spall. Only has to be 0.001 inch high.
Other threads point to some good bearing failure analysis info
RE: yellow grease
Meant to say only has to be 0.0001 inch high