This comprehensive Komatsu 125-2 Series Diesel Engine Workshop Service Repair Manual provides detailed instructions and guidance for servicing and repairing the 11.0L 6-cylinder, turbocharged, 6D125-2 engine. It covers a wide range of topics including general information, maintenance procedures, technical data, special tools required, tightening torques, and detailed breakdowns of various engine systems. The manual features detailed exploded views, allowing for a thorough understanding of the engine's components and their relationships. Clear and concise step-by-step written procedures are accompanied by illustrative diagrams and pictures, making it easy to follow even the most complex tasks. The content covers a wide range of essential areas, including: * **Air Intake, Exhaust, Air Cleaner, Turbocharger, Aftercooler, and Muffler Systems:** Learn about the intricacies of these systems, from their components to their functions and maintenance procedures. * **Engine Disassembly and Assembly:** This section provides comprehensive instructions for taking apart and putting back together the engine, ensuring a smooth and accurate process. * **Crankshaft-Camshaft, Flywheel Housing, Piston-Connecting Rod, Cylinder-Valves, Lubrication System, Fuel System, Cooling System, and Electrical Equipment:** Gain a deep understanding of these critical engine subsystems and their components, enabling you to effectively diagnose and address any issues. * **Testing and Adjustment:** This section provides detailed instructions for performing various tests and adjustments, allowing you to ensure optimal engine performance. * **Starting Motor, Alternator System, and Engine Controller:** Learn about these crucial electrical components and their functions, enabling you to troubleshoot electrical issues effectively. * **Troubleshooting:** This section provides a comprehensive guide to diagnosing and resolving common engine problems, helping you quickly identify and address any issues. With its wealth of information and detailed illustrations, this manual is an invaluable resource for mechanics, technicians, and anyone involved in maintaining and repairing Komatsu 125-2 Series diesel engines.

The Komatsu 125-2 Series Diesel Engine is a robust and powerful engine designed to power a wide range of heavy machinery, including excavators, loaders, and bulldozers. It is a workhorse in the construction, mining, and forestry industries, known for its reliability, durability, and efficiency. The 125-2 Series engine utilizes a sophisticated design with advanced features to ensure optimal performance and longevity. The engine boasts a high-pressure common rail fuel injection system for precise fuel delivery and improved combustion efficiency, resulting in lower emissions and increased fuel economy. It also incorporates a turbocharger that boosts engine power and torque, enabling the machine to handle demanding tasks with ease. The Komatsu 125-2 Series Diesel Engine is meticulously engineered and built to withstand the rigors of heavy-duty operation. The engine features a robust crankshaft and connecting rods, ensuring smooth and reliable operation even under extreme loads. The cylinder block and cylinder head are constructed from high-quality cast iron, providing exceptional strength and durability. The engine is also equipped with a highly efficient cooling system and a robust air filtration system to protect its internal components from dust, dirt, and other contaminants. This commitment to quality and engineering excellence has made the Komatsu 125-2 Series Diesel Engine a highly sought-after powerplant in the heavy machinery industry.