The purpose of the test is to measure the ability of a grease to lubricate at various speeds, various temperatures and various
loads. Grease quality is measured by recording the number of running hours before the grease ceases to lubricate and, as a consequence, the bearings fail. The longer the number of running hours in the test unit, the more effectively the grease lubricates under
those conditions. In this way the maximum operating speed, temperature and load for a particular grease can be determined.
Lubricating greases developed for hightemperature or high-speed bearing applications or a combination of both should offer what they promise. The challenge is to check that these promises are fulfilled. Current test methods give inadequate results. This is why, many years ago, SKF developed its own grease test rigs in order to determine the most suitable grease qualities to ensure the best possible performance for SKF highquality bearings.