Lubricants - Lubricating greases G - Classification and requirements

2Scope / Description

This standard applies to Class G greases with NLGI grades 000 to 2, according to DIN 51818:1981-12, for the lubrication of transmission components, particularly enclosed gearboxes. Primarily for exchange lubrication, it also typically lubricates bearings and couplings in addition to gear meshing. When selecting Class G greases, gear type, gear construction, gear size, and operating and environmental conditions must be considered. Assessing the suitability of Class G greases for high-load gearbox lubrication is challenging. Meeting the load tests in Table 2 according to DIN 51350-4 and DIN ISO 14635-3 does not necessarily guarantee the grease's suitability for high loads; these should be considered minimum requirements. When using Class G greases containing solid lubricants, attention must be paid to their tribochemical and physical behavior on the materials of the friction components.