Seizure in bearings and shafts is a condition resulting from which factor?

Seizure in bearings and shafts is a condition resulting from which factor?

• A. Excessive heat during rotation, elements begin to soften.
• B. Lack of lubrication only.
• C. Rapid cooling of the bearing.
• D. Over-greasing the shaft.

Answer: (A)

Seizure happens when the bearing surfaces seize up due to loss of the lubricating film from excessive heat. As rotating parts overheat, the lubricant between the rollers or balls and raceways breaks down—its film becomes too thin or it oxidizes into sticky deposits. The result is metal-to-metal contact that can cause surfaces to weld or gall, drastically reducing clearance and locking the bearing in place. This overheating mechanism is what drives seizure, rather than just a lack of lubrication or other factors. Lack of lubrication can cause wear and overheating too, but seizures are most directly linked to the lubricant failing under high heat, which lets the surfaces stick together. Rapid cooling or over-greasing don’t typically produce seizure in the same direct way; cooling can introduce other stresses, and over-greasing mainly adds drag and heat without the same adhesive lock characteristic.

Seizure happens when the bearing surfaces seize up due to loss of the lubricating film from excessive heat. As rotating parts overheat, the lubricant between the rollers or balls and raceways breaks down—its film becomes too thin or it oxidizes into sticky deposits. The result is metal-to-metal contact that can cause surfaces to weld or gall, drastically reducing clearance and locking the bearing in place. This overheating mechanism is what drives seizure, rather than just a lack of lubrication or other factors. Lack of lubrication can cause wear and overheating too, but seizures are most directly linked to the lubricant failing under high heat, which lets the surfaces stick together. Rapid cooling or over-greasing don’t typically produce seizure in the same direct way; cooling can introduce other stresses, and over-greasing mainly adds drag and heat without the same adhesive lock characteristic.