ASTM D1263 for leakage tendencies of automotive wheel bearing greases
4. Summary of Test Method
4.1 The grease is distributed in a modified front-wheel hub and spindle assembly. The hub is rotated at a speed of 660 more or less 30 rpm for 6 h more or less 5 min, at a spindle temperature which is raised to and then maintained at 105 more or less 1.2°C (220 more or less 2.5°F). Leakage of grease or oil, or both, is measured, and the condition of the bearing surface is noted at the end of the test.
5. Significance and Use
5.1 The test method provides a screening device that permits differentiation among products having distinctly different leakage characteristics (Note 1). It is not the equivalent of longtime service tests, nor is it intended to distinguish between wheel bearing greases showing similar or borderline leakage.
NOTE 1 - It is possible for skilled operators to observe significant changes in other important grease characteristics that occurred during the test. Such additional information can be of special interest to individual operators. The observations, however, are subject to differences in personal judgment among operators, and cannot be used effectively for quantitative rating.
