This manual covers the Liebherr R900C Litronic Hydraulic Excavator, beginning from serial number 25621. This robust machine is engineered for demanding operational environments, emphasizing peak performance through effective, economical, and safe operation. Its design focuses on reliability and efficiency, making it a valuable asset for various construction and material handling tasks. The scope of this Operation & Maintenance Manual is comprehensive, detailing procedures for operation, handling, lubrication, maintenance, checking, and adjustment. It is an essential resource for operators and maintenance personnel, providing the necessary information to ensure the excavator performs at its best. Key sections include product description, safety notes, control and operation, malfunction diagnosis, and detailed maintenance schedules.