April 2000

Rotating Equipment/Reliability

Analyzing gear failures

Use this information to identify and eliminate problems

DeLange, G., Prager Inc.

As with any failure analysis, finding the root cause of damage to gearing often requires a lot of detective work. You may need to review the service history and interview witnesses or employ technical tools such as vibration and oil analysis. However, the cause of failure cannot be determined without a complete inspection of the gear teeth condition. Understanding failure modes indicated by the teeth condition, when combined with knowledge of operating conditions and maintenance history, permits developing methods to avoid similar, future failures. Getting into gear. To analyze and interpret gear failures, it is helpful to co

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