This comprehensive Service Repair Manual provides detailed instructions and technical specifications for maintaining, assembling, disassembling, and servicing the Komatsu PC400LC-6 and PC400HD-6 Hydraulic Excavators. It is designed for technicians and mechanics working on these machines, offering in-depth information on every aspect of their operation. The manual covers a wide range of topics including:

* **Engine and Powertrain:** Detailed information on engine components, fuel systems, cooling systems, transmissions, and hydraulic systems.
* **Hydraulic System:** Comprehensive coverage of hydraulic pumps, valves, cylinders, and control systems, along with troubleshooting and repair procedures.
* **Undercarriage:** Thorough instructions on maintaining and repairing tracks, sprockets, idlers, and other undercarriage components.
* **Electrical System:** In-depth information on electrical wiring diagrams, troubleshooting, and repair procedures for electrical components.
* **Cab and Controls:** Detailed instructions on maintaining and repairing the operator's cab, controls, and safety systems.
* **Troubleshooting and Diagnostics:** Detailed troubleshooting guides and diagnostic procedures for identifying and resolving common problems.
* **Service and Maintenance:** Complete information on regular service schedules, maintenance procedures, and recommended parts and fluids.

This manual is an invaluable resource for anyone working on Komatsu PC400LC-6 and PC400HD-6 Hydraulic Excavators. It provides the necessary information to ensure proper maintenance, troubleshooting, and repair of these powerful machines.

The Komatsu PC400LC-6 and PC400HD-6 Hydraulic Excavators are powerful and versatile heavy machinery designed for a wide range of construction and earthmoving applications. These models are known for their exceptional performance, reliability, and operator comfort. The PC400LC-6 is the standard configuration, offering a balance of power and efficiency, while the PC400HD-6 is a heavy-duty model designed for demanding tasks in challenging environments. Both excavators feature a robust construction, with a durable undercarriage designed for stability and long-lasting operation. Their powerful Komatsu SAA6D170E-6 engine provides ample horsepower for excavating, loading, and lifting heavy materials. The hydraulic system is optimized for precision control and responsiveness, allowing for smooth and efficient operation in various applications.

The Komatsu PC400LC-6 and PC400HD-6 excavators boast innovative features that enhance operator comfort and productivity. The spacious and ergonomically designed cab provides exceptional visibility and a comfortable working environment. Advanced control systems and intuitive interfaces simplify operation and reduce operator fatigue. The excavators are equipped with advanced safety features, such as a reinforced ROPS/FOPS cab and a comprehensive monitoring system that alerts the operator to potential issues. These features ensure a safe and productive working environment for the operator. Moreover, Komatsu's focus on sustainability is evident in the PC400LC-6 and PC400HD-6. These excavators are designed with fuel-efficient engines and optimized hydraulic systems to reduce fuel consumption and minimize environmental impact. Their robust construction and long service life contribute to their overall sustainability, reducing the need for frequent repairs and replacements.