This manual covers the Caterpillar 345D Excavator, a robust machine engineered for demanding construction and earthmoving applications. Built with Caterpillar's renowned commitment to quality and reliability, the 345D features a powerful C13 ACERT diesel engine, delivering substantial net power of 274 kW (368 hp). Its hydrostatic transmission and 4-wheel drive system provide efficient power and control, while its substantial operating weight of 43,660 kg (96,250 lb) ensures stability and performance in challenging environments. This excavator is designed to maximize productivity and uptime on any job site. The purpose of this English Parts Catalog is to provide comprehensive information for the identification and ordering of genuine Caterpillar parts for the 345D Excavator. It details various components, systems, and specifications, including engine details, transmission information, and physical dimensions. This manual is an essential resource for owners, operators, and service technicians, enabling them to perform accurate maintenance, repairs, and part replacements, thereby ensuring the continued optimal performance and longevity of the machine.