Specifications and maintenance of girth gears

The American Gear Manufacturers Association has issued a new product standard on the rating of mill and kiln gears. The base document for the new standard is also new and can lead to some confusion. The author attempts to clear up the difference in rating between the old and new girth gear standards. The maintenance of girth gears is described. Lubrication of girth gears is a key to their long life and is discussed.<>