This shop manual provides comprehensive service and repair instructions for the Komatsu PC340LC and PC340NLC-7K excavators. It includes detailed procedures for diagnosing, troubleshooting, and repairing major components such as the engine, hydraulic system, undercarriage, transmission, and electrical systems. The manual offers step-by-step guidance for disassembly, inspection, reassembly, and adjustments of various parts. Additionally, it covers maintenance schedules, technical specifications, and safety protocols. This document is essential for technicians and mechanics to ensure proper maintenance and efficient repairs, thereby maintaining the excavators’ performance and reliability.