This comprehensive service and repair manual provides detailed instructions and technical specifications for the Komatsu 4D98, 4D106, and S4D106 engines. It covers all aspects of engine maintenance, repair, and troubleshooting, giving you the information you need to perform a wide range of procedures, from routine maintenance to complex repairs. The manual includes detailed diagrams, illustrations, and step-by-step instructions to guide you through each task. It covers engine components such as the fuel system, cooling system, lubrication system, electrical system, and more. This manual is a valuable resource for mechanics, technicians, and anyone who needs to work on these Komatsu engines.