Pitting | NSK

Damage Condition	Possible Causes	Countermeasures
The pitted surface has a dull luster which appears on the rolling element surface or raceway surface.	Debris becomes caught in the lubricant Exposure to moisture in the atmosphere Poor lubrication	Improve the sealing mechanism Filter the lubrication oil thoroughly Use a proper lubricant

Damage Condition

Possible Causes

Countermeasures

The pitted surface has a dull luster which appears on the rolling element surface or raceway surface.

Debris becomes caught in the lubricant

Exposure to moisture in the atmosphere

Poor lubrication

Improve the sealing mechanism

Filter the lubrication oil thoroughly

Use a proper lubricant

Click a photo to enlarge it

Part : Outer ring of a slewing bearing

Symptom : Pitting on the raceway surface

Cause : Rust

Part : Ball of damage "PITTING 1"

Symptom : Pitting on the rolling element surface