ASTM D4693 for low-temperature torque of grease-lubricated wheel bearings
ASTM D4693 standard test method for low-temperature torque of grease-lubricated wheel bearings
4. Summary of Test Method
4.1 A freshly stirred and worked sample of test grease is packed into the bearings of a specially-manufactured, automotive-type spindle-bearings-hub assembly. The assembly is heated and then cold soaked at -40°C, unless another test temperature is specified by the grease specification. The spindle is rotated at 1 rpm and the torque required to prevent rotation of the hub is measured at 60 s.
5. Significance and Use
5.1 This test method differentiates among greases having distinctly different low-temperature characteristics. This test is used for specification purposes and correlates with its precursor which has been used to predict the performance of greases in automotive wheel bearings in low-temperature service. It is the responsibility of the user to determine the correlation with other types of service.
