A customer intends testing a vehicle of ours after conditioning it to -46 C (-50F). The vehicle has an axle and hub reduction which use case-carburized 8620 and 4820 gears. Does anyone have any experience of operation of such gears at these kind of temperatures? Obviously after a few minutes driving they will warm up, but I am concerned about possible brittle fracture of a tooth at startup. At the moment we are just warning them not to apply any shock loads until after the driveline has warmed up, but I'd appreciate any more detailed advice/experience.
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