EXPLANATION
This test method is used for quickly determining extreme pressure properties of lubricating greases at selected temperatures specified for use in applications where high speed vibrational or start-stop motions are present with high Hertzian point contact. This test method has found wide application in qualifying lubricating greases used in constant velocity joints of front-wheel-drive automobiles.
TEST SUMMARY
This test method is performed on an SRV test machine using a steel test ball oscillating against a steel test disk with lubricant between them. Test load is increased in 100-N increments until seizure occurs. The load, immediately prior to the load at which seizure occurs, is measured and reported. Test frequency, stroke length, temperature, and ball and disk material can be varied to simulate field conditions.
TEST PRECISION
Where X is the average of two results.
This test method has no bias.