This shop manual provides comprehensive service and repair instructions for the Komatsu D65PX-12 and D65EX-12 excavator models. It includes detailed procedures for diagnosing, troubleshooting, and repairing components such as the engine, hydraulic system, undercarriage, transmission, and electrical systems. The manual offers step-by-step guidance for disassembly, inspection, and reassembly, as well as technical specifications and maintenance schedules. This document is essential for technicians and mechanics to ensure proper maintenance and repair, thereby maintaining the excavators’ performance and durability.