Gear failure index

5.0 Abrasive material in lubricant

Click on photograph to enlarge
	Figure 5a Hard contaminants in the oil causing surface embedding marks on the teeth
	Figure 5b Abrasive scores caused by the dragging of hard particles between mating tooth surfaces
	Figure 5c Severe wear due to lengthy operation with oil contaminated with an abrasive
	Figure 5d Lapping wear of gear teeth due to the presence of fine abrasive in the lubricating oil.
Main Characteristics	When hard abrasive material is present in the lubricant the teeth may show embedding damage or abrasive scoring sometimes leading to major surface wear.
Cause
Note
Possible Confusion with Other Types of Damage
Comment

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