In a single countershaft, synchronized transmission, if only one gear tooth is broken, what does that indicate about the cause?

In a single countershaft, synchronized transmission, if only one gear tooth is broken, what does that indicate about the cause?

• A. Only one tooth damaged
• B. Several teeth damaged
• C. Dramatic grinding in gear
• D. No wear in other gears

Answer: (A)

Damage pattern tells you how the failure happened. If only one tooth on a gear is broken, that points to a localized, one-time event affecting just that tooth rather than ongoing wear. This kind of isolated break is commonly due to a short shock load, a foreign object snagging that tooth, or a defect confined to that tooth. Widespread wear or damage across several teeth would suggest a sustained overload, poor lubrication, or misalignment over time. Dramatic grinding implies severe meshing problems and would typically show more extensive damage, not just a single tooth. So the isolated broken tooth indicates a single-event, localized cause rather than a systemic issue.

Damage pattern tells you how the failure happened. If only one tooth on a gear is broken, that points to a localized, one-time event affecting just that tooth rather than ongoing wear. This kind of isolated break is commonly due to a short shock load, a foreign object snagging that tooth, or a defect confined to that tooth. Widespread wear or damage across several teeth would suggest a sustained overload, poor lubrication, or misalignment over time. Dramatic grinding implies severe meshing problems and would typically show more extensive damage, not just a single tooth. So the isolated broken tooth indicates a single-event, localized cause rather than a systemic issue.