AGMA Standards have traditionally focused on rated capacity and allowable stress levels. Design life is addressed in
various calculations and occasional comments are made concemning component design. The focus of this paper is the
actual field performance of over 2,000 different gearboxes that have been repaired over the last 15 years.
The information presented consists of a statistical review of the types of gearboxes repaired and the typical failure modes.
Amongthe problems described are tooth breakage, tooth wear, housing bore damage, seal wear, and lube system failures.
Photographs are included along with suggested design practice changes and a proposal for extended life service classes.
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