This comprehensive Komatsu Excavator 400-6 & 450-6 Service Repair Manual Supplement provides detailed technical information for the PC400-6, P400LC-6, PC450-6, and PC450LC-6 models. It specifically covers excavators with serial numbers PC400-6 32488 and up, and PC450-6 12629 and up. This manual focuses on the specific updates and changes implemented for these serial numbers, supplementing the information found in the main PC400, 450 Shop Manual SEBM014506. The manual delves into the intricacies of the SAA6D125E-2 engine, which powers the PC400, 450-6 models, and you can find further details about the engine in the 125-2 Series Engine Shop Manual. This supplemental manual is an essential resource for mechanics, technicians, and owners seeking to maintain and repair these Komatsu excavators, providing detailed instructions and diagrams to ensure efficient and effective service.

The Komatsu PC400-6 and PC450-6 series excavators are powerful and versatile machines designed for heavy-duty construction and earthmoving applications. They are part of Komatsu's renowned line of excavators known for their durability, reliability, and efficiency. The PC400-6 and PC450-6 models are both equipped with a robust 6-cylinder Komatsu SAA6D140E-2 engine, delivering impressive power and torque. The PC400-6 boasts a maximum digging force of 443 kN and an operating weight of 40.2 tons, while the larger PC450-6 offers a maximum digging force of 475 kN and an operating weight of 44.7 tons. Both models feature a spacious and ergonomic cab, designed to enhance operator comfort and productivity. The cab provides excellent visibility and controllability, thanks to the strategically placed control levers and a large windshield. Beyond their impressive core performance, the PC400-6 and PC450-6 excavators are engineered with advanced technologies and features that contribute to their efficiency and operator comfort. Both models come standard with Komatsu's renowned "KOMTRAX" system, which provides real-time machine tracking, fuel consumption monitoring, and other critical operational data. This information can be accessed remotely, allowing for proactive maintenance and optimization of machine performance. The excavators are also equipped with various safety features, including a reinforced ROPS/FOPS cab and a comprehensive warning system. The Komatsu PC400-6 and PC450-6 excavators are highly sought-after machines in the construction and mining industries, renowned for their strength, reliability, and operator-friendly features. They are powerful tools designed to tackle demanding projects efficiently and safely.