This International Standard specifies steering system tests and performance criteria for evaluating the steering capability of rubber-tyred, self-propelled earth-moving machines having a machine speed, determined in accordance with ISO 6014, greater than 20 km/h. It is applicable to dozers, loaders, back-hoe loaders, excavators, dumpers, scrapers and graders equipped with either manual steering, power-assisted steering or fully powered steering systems as defined in ISO 6165. It is not applicable to rollers, compactors or pipelayers.