This document is a service manual for Liebherr hydraulic excavators. It contains 18 sections that provide technical data, diagrams, and instructions for maintenance and repair. The manual is intended to assist customer support but does not replace technical training. Safety instructions and warnings are included to help prevent injury when working on the machines. Sections cover topics like the engine, hydraulics, electrical systems, and optional equipment. The manual structures information using a numbering system for easy reference.