The Komatsu PC78MR-6, part of the MR-6 Series, is a versatile excavator engineered for robust performance and reliability in demanding work environments. Its design emphasizes operational efficiency and durability, making it a valuable asset for construction, landscaping, and various other heavy-duty applications. This machine is built with precision engineering to ensure consistent output and longevity, reflecting Komatsu's commitment to quality in its equipment offerings. This Full Service Repair Manual provides comprehensive guidance for the Komatsu PC78MR-6. It covers essential maintenance procedures, detailed troubleshooting steps, and critical technical specifications necessary for optimal operation and upkeep. The manual is designed to assist owners, technicians, and mechanics in understanding, maintaining, and repairing the vehicle, ensuring its continued performance and safety throughout its service life.