Which option lists typical bearing wear types and how to recognize them?

Which option lists typical bearing wear types and how to recognize them?

• A. Spalling/pitting from fatigue
• B. Scoring from misalignment or debris
• C. Spalling/pitting from fatigue; scoring from misalignment or debris; brinelling from impact loads; discoloration indicating overheating
• D. Discoloration indicating overheating

Answer: (C)

Recognizing common bearing wear patterns and how they present. Spalling or pitting from fatigue shows as small pits or flaky areas on raceways or rolling elements caused by repeated stresses. Scoring from misalignment or debris appears as grooves or scratches on races or balls, typically from contamination or improper alignment. Brinelling from impact loads shows up as indentations on bearing races caused by heavy shocks or improper handling or mounting. Discoloration indicating overheating appears as blue or brown hues on bearing surfaces, signaling lubricant failures or excessive temperatures. Because each wear type points to a different underlying issue—fatigue, contamination/misalignment, impact handling, and lubrication/temperature problems—the complete option that lists all four types and how to recognize them is the best choice. Other options miss one or more wear patterns or signs, making them incomplete.

Recognizing common bearing wear patterns and how they present. Spalling or pitting from fatigue shows as small pits or flaky areas on raceways or rolling elements caused by repeated stresses. Scoring from misalignment or debris appears as grooves or scratches on races or balls, typically from contamination or improper alignment. Brinelling from impact loads shows up as indentations on bearing races caused by heavy shocks or improper handling or mounting. Discoloration indicating overheating appears as blue or brown hues on bearing surfaces, signaling lubricant failures or excessive temperatures.

Because each wear type points to a different underlying issue—fatigue, contamination/misalignment, impact handling, and lubrication/temperature problems—the complete option that lists all four types and how to recognize them is the best choice. Other options miss one or more wear patterns or signs, making them incomplete.