What should be checked when abrasive wear and debris are found in a bearing?

LILY Bearing | 2026-10-28

Best answer

Separate debris origin from the surface where it was found

NSK's wear guidance links abrasive damage with contamination and relevant operating conditions.

Material discovered inside a bearing can have entered from outside or arisen from another deteriorating component. Its presence at the bearing therefore does not prove that the bearing was the original source. The investigation should map the lubrication and sealing paths and consider other components sharing the lubricant. Describe the observed wear and preserve representative debris evidence before assigning a cause. A useful report explains the location and condition of the material without treating all metallic particles as equivalent or assuming one visible damaged component generated them all.

Trace the route through the actual system

Record the bearing position, lubricant path, filters, seals, lubrication tools and adjacent components relevant to the assembly.

Label samples by location and time, including whether they came from a supply, return, housing or waste drain. Compare those observations with maintenance and component-change history. If the source remains unknown, keep it open while the examination proceeds. A proposed correction should explain how it addresses the supported entry or generation route and how its effect will be verified. This approach prevents a new bearing and fresh lubricant from being treated as proof that the contamination mechanism has disappeared from the machine.