Full Description

This part of ISO 14635 specifies a test method based on an FZG²⁾ four-square test machine to determine the relative load-carrying capacity of lubricating oils defined by the gear-surface damage known as scuffing. High surface temperatures due to high surface pressures and sliding velocities can initiate the breakdown of the lubricant films. This test method can be used to assess such lubricant breakdown under defined conditions of temperature, high sliding velocity and stepwise increased load.

2) FZG = Forschungsstelle fr Zahnrder und Getriebebau, Technische Universitt Mnchen (Gear Research Centre, Technical University, Munich), Boltzmannstrae 15, D-85748 Garching, Germany.