Failure analysis on gearboxes used to control earth-station antennas. It was found that 3 gearboxes had failed at three separate locations, with less than six years of service. Metallurgical tests and engineering analysis were were also done.
We determined that the gearbox was of sound design and of quality fabrication. The stage gears did not show any signs of misalignment, wear or pitting. Lubrication appeared adequate. Observed damage was limited to the output pinions and ring gears. It is likely that the tooth or teeth on the output pinion initially broke, and the harder pinion teeth (400 + BHN) subsequently damaged ring gear teeth.
O’Donnell Consulting Performs Failure Analysis on Gearboxes, Industrial Machinery and other Equipment for Clients in Various Industries.