This comprehensive service manual is designed to provide detailed information for the Komatsu PC400-6, PC400LC-6, PC450-6, and PC450LC-6 hydraulic excavators. Specifically, it covers models with serial numbers starting from 32488 for the PC400 and PC400LC-6, and 12629 for the PC450 and PC450LC-6. The manual offers an in-depth understanding of the excavator's structure and function, guiding technicians through the proper procedures for testing, adjusting, disassembling, and assembling components. It provides clear instructions to ensure quality repairs, enhancing operational efficiency and minimizing downtime. The manual also includes information related to the SAA6D125E-2 engine, which is mounted on the PC400 and PC450-6 models. For further details concerning the engine, refer to the 125-2 Series Engine Shop Manual. This service manual is a valuable resource for any technician working on these Komatsu excavator models, enabling them to perform repairs effectively and accurately.

The Komatsu PC400-6, PC400LC-6, PC450-6, and PC450LC-6 are powerful hydraulic excavators designed for heavy-duty construction and mining applications. These models are renowned for their robust construction, high performance, and advanced features. The PC400-6 and PC450-6 are standard models, while the PC400LC-6 and PC450LC-6 are long-reach configurations, offering extended digging reach for specific tasks. All models share a common platform featuring a powerful Komatsu SAA6D140E-6 engine, delivering high horsepower and torque for efficient operation. The excavators boast a durable undercarriage with heavy-duty tracks and wide track shoes, providing excellent stability and traction on challenging terrain. Their robust construction includes a reinforced boom, arm, and bucket, capable of handling heavy loads and demanding excavation projects.

Komatsu's commitment to operator comfort and safety is evident in the PC400-6 and PC450-6 models. The spacious cab is designed ergonomically with intuitive controls, providing a comfortable and effective working environment. Features like air conditioning, soundproofing, and a large windshield enhance operator comfort and visibility. The excavators are equipped with advanced safety features, including a comprehensive alarm system, a backup camera, and a robust ROPS/FOPS certified cab, ensuring operator safety in demanding environments. These models are designed for versatility, offering a range of attachments compatible with the excavator's hydraulic system, enabling a wide array of tasks beyond traditional excavation, such as material handling, demolition, and ground preparation. The PC400-6 and PC450-6 series continue to represent Komatsu's dedication to providing reliable, efficient, and safe heavy-duty excavators for diverse construction and mining needs.