This manual provides comprehensive service and repair information for the Liebherr R 914 C and R 924 C Hydraulic Excavators, covering serial numbers 19527 and up for the R 914 C, and 19846 and up for the R 924 C. These excavators are engineered for demanding construction and industrial applications, built with Liebherr's renowned commitment to quality, reliability, and advanced hydraulic technology. This documentation ensures that operators and technicians have access to the detailed knowledge required to maintain these robust machines at peak performance. The scope of this manual encompasses all essential aspects of the Liebherr R 914 C and R 924 C Hydraulic Excavators. It includes detailed sections on general information, required tools, technical data, maintenance guidelines, engine systems, coupling and splitter boxes, hydraulic systems and components, electrical systems, swing gear and rings, travel gear and track components, optional equipment, and the cab, heater, and air conditioning systems. Furthermore, it covers central lubrication. This manual is designed to guide owners, mechanics, and technicians through routine maintenance, troubleshooting, and repair procedures, enabling efficient and cost-effective upkeep of the equipment.