This comprehensive service repair manual provides detailed instructions and information for servicing and repairing the Komatsu 155-4 Series engines, including the S4D155-4, S6D155-4, S6D155G-4, and SA6D155-4 models. The manual contains everything you need to diagnose and fix issues, making it an invaluable resource for mechanics and DIY enthusiasts alike. With this manual, you can save money by performing repairs yourself and gain a deeper understanding of your Komatsu engine.

The Komatsu 155-4 Series Engine Shop Manual encompasses a comprehensive collection of technical information for the S4D155, S6D155, and SA6D155 series engines, integral components powering a diverse range of Komatsu equipment. This manual serves as an invaluable resource for technicians, mechanics, and operators involved in the maintenance, repair, and troubleshooting of these robust powerhouses. It provides detailed specifications, wiring diagrams, exploded views, and step-by-step procedures for every aspect of engine operation, from routine maintenance to complex overhauls. The manual's detailed illustrations and clear language make it easy to understand and follow, ensuring efficient and effective repair procedures. The Komatsu 155-4 Series engines are renowned for their durability, reliability, and power output, making them ideal for demanding applications in construction, mining, forestry, and other industries. The S4D155, S6D155, and SA6D155 engines are variations within this series, each optimized for specific power requirements and operating conditions. The S4D155, a four-cylinder turbocharged diesel engine, delivers a powerful balance of performance and fuel efficiency, while the S6D155, a six-cylinder turbocharged diesel, offers increased power for heavier-duty applications. The SA6D155, a six-cylinder turbocharged diesel with an aftercooler, represents the pinnacle of performance within the 155-4 series, providing exceptional power and torque for demanding tasks. These engines are meticulously engineered for longevity, featuring robust components, advanced cooling systems, and efficient fuel injection systems. With proper maintenance and adherence to the guidance provided in the Shop Manual, these engines are capable of delivering years of reliable service, minimizing downtime and maximizing productivity.