The "Power Units - 115 Series" Parts Catalog (PC-666) is a comprehensive reference manual designed for users seeking detailed information on components associated with the John Deere Dubuque Tractor Works equipment. This revised catalog includes a numerical index for easy navigation of part numbers and corresponding page keys, ensuring users can quickly locate the items and specifications relevant to their maintenance and repair needs. Users are also instructed to integrate this new catalog into their files by discarding any outdated versions, maintaining the accuracy and efficiency of their operations.