This manual covers the Liebherr R 912 Tunnel Litronic excavator, identified by Type number 604 and serial numbers from 4001. Designed for specialized tunneling operations, this machine embodies Liebherr's commitment to robust engineering and operational reliability. Its advanced Litronic system ensures precise control and efficient performance in demanding underground environments. This publication is intended for both the machine operator and maintenance personnel, providing essential information for safe and effective use. The purpose of this manual is to equip users with comprehensive knowledge for the operation, maintenance, and troubleshooting of the R 912 Tunnel Litronic excavator. It details product descriptions, critical safety guidelines, operational procedures, common malfunctions, and essential maintenance schedules. By thoroughly studying and adhering to the instructions within, operators can maximize the machine's uptime, extend its service life, and minimize repair costs, ensuring consistent performance and reliability.