EXPLANATION
This test method evaluates the leakage tendencies of wheel bearing greases. This test method provides a screening device that permits differentiation between products having distinctly different leakage characteristics. It is not equivalent to long term service tests, nor is it intended to distinguish between wheel bearing greases showing similar or borderline leakage.
TEST SUMMARY
The grease is distributed in a modified front-wheel hub and spindle assembly. The hub is rotated at a speed of 660 +/- 30 r/min for 6 h +/- 5 min, at a spindle temperature, which is raised to and then maintained at 105 +/- 1.2° C. Leakage of grease or oil, or both, is measured, and the condition of the bearing surface is noted at the end of the test.
TEST PRECISION
This test method has no bias.