Failure occurred in the teeth of a case-hardening Ni-Cr-Mo alloy steel spur gear in the transmission system of heavy duty tracked vehicles. The defects were in the nature of seizure on the involute profile. Scrutiny of the transmission system showed there might be choking in the lubricating oil line. Such would cause seizure of the gears and damage. The incidence of such defects stopped after corrective measures were taken.
P. K. Chatterjee, Damages in Gears in the Transmission System of Heavy Duty Tracked Vehicles, ASM Failure Analysis Case Histories: Construction, Mining, and Agricultural Equipment, ASM International, 2019, https://doi.org/10.31399/asm.fach.conag.c9001248
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