The Komatsu PC300-5 Series and PC400-5 Series excavators represent robust engineering designed for demanding operational environments. Built with a focus on reliability and performance, these machines are equipped to handle a wide range of construction and earthmoving tasks. Their 5 Series designation signifies a generation of equipment refined for efficiency and durability, making them a dependable choice for professionals in the heavy machinery sector. This Service Shop Repair Manual provides comprehensive guidance for the maintenance and repair of your Komatsu excavators. It covers essential areas including structure and function, testing and adjusting, disassembly and assembly, and maintenance standards. Detailed repair and servicing procedures, along with troubleshooting information and technical maintenance data, are included to assist owners, mechanics, and technicians in ensuring optimal performance and longevity of the PC300-5 and PC400-5 Series machines.