This manual covers the Liebherr TL441-10, TL451-10, TL441-13, and TL451-13 Telescopic Handler models, specifically those manufactured from F/N xxx-12000 and up. These machines are engineered for demanding operational environments, offering robust performance and reliability. The detailed information within this guide is designed to support the maintenance, assembly, disassembly, and servicing of these powerful telescopic handlers, ensuring their continued efficient operation. The purpose of this comprehensive service repair manual is to provide owners, mechanics, and technicians with all the necessary information for diagnosing, repairing, and maintaining their Liebherr telescopic handlers. It includes detailed technical data, maintenance guidelines, step-by-step repair procedures, electrical system diagrams, hydraulic system information, and troubleshooting guidance. With its extensive coverage, this manual aims to empower users to perform necessary upkeep and repairs effectively, saving time and resources.