Gear Oil Scuff Test (GOST)

The Gear Oil Scuff Test (GOST) developed by Southwest Research Institute is a cost-effective procedure that may be used to accurately predict full-scale gear tests.

Good correlation has been demonstrated for a large matrix of oils with both the Forschungstelle für Záhnräder und Getriebebau (FZG) and Ryder gear test procedures.

The GOST procedure consists of a laboratory scale wear test to define the boundary lubricating characteristics of the oil. The Ryder and FZG load stage results are then predicted using mathematical models which incorporate the laboratory wear test result, the kinematic viscosity at 100°C, and the respective gear tooth geometry.

The GOST procedure has been accepted as SAE Aerospace Information Report (AIR) 4978.

The GOST test accurately predicts the load-carrying capacity of a test oil when operated in the FZG gears shown here.

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This plot shows a correlation between SwRI-developed GOST procedure and the full-scale FZG gear test.

This flyer was published in February 1999. For more information about Gear Oil Scuff Test (GOST), contact Robert Legg, Petroleum Products Research Department, Fuels and Lubricants Research Division, Southwest Research Institute, P.O. Drawer 28510, San Antonio, Texas 78228-0510, Phone (210) 522-3797, Fax (210) 522-5592.

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