The Komatsu PC400-7 and PC450-7 Excavator Complete Workshop Service Repair Manual provides comprehensive and detailed instructions for servicing and repairing these popular excavator models. This manual covers all aspects of maintenance and repair, including but not limited to: * **Engine:** Detailed diagrams and step-by-step instructions for engine repair, maintenance, and troubleshooting, covering everything from fuel systems to cooling systems. * **Hydraulics:** In-depth information on hydraulic systems, including pumps, valves, cylinders, and lines. Learn how to diagnose and fix hydraulic problems, perform routine maintenance, and adjust hydraulic systems for optimal performance. * **Transmission:** Detailed information on transmission operation, disassembly, repair, and reassembly. Learn how to identify and resolve transmission issues, and perform essential maintenance to ensure smooth and reliable operation. * **Electrical System:** Comprehensive diagrams and instructions for troubleshooting and repairing the electrical system. Understand the wiring harness, electrical components, sensors, and control systems. * **Undercarriage:** Detailed instructions on inspecting, maintaining, and repairing the undercarriage components, including tracks, sprockets, rollers, and idlers. * **Cab and Operator Controls:** Information on diagnosing and repairing problems with the cab, operator controls, and operator station. Learn how to troubleshoot issues with switches, indicator lights, and other dashboard components. * **Troubleshooting:** This manual provides detailed troubleshooting guides to help you identify and resolve a wide range of problems, making it easier to diagnose and repair issues efficiently. This manual is designed to be a user-friendly resource for anyone who wants to perform their own maintenance and repairs on Komatsu PC400-7 and PC450-7 excavators. The clear and concise instructions, along with detailed illustrations, make it easy to understand even complex repair procedures. This manual is an essential tool for any excavator owner, mechanic, or technician who wants to save time and money by performing their own repairs.

The Komatsu PC400-7 and PC450-7 excavators are powerful and versatile machines designed for heavy-duty construction and earthmoving applications. These models represent the seventh generation of Komatsu's popular PC400/450 series, incorporating several advancements over their predecessors. The PC400-7 is equipped with a Komatsu SAA6D170E-6 engine, delivering a maximum power output of 294 kW (394 hp), while the PC450-7 boasts a Komatsu SAA6D170E-5 engine with 318 kW (427 hp) of power. Both excavators feature a robust undercarriage with a durable track frame and reliable track chains, ensuring stability and maneuverability in demanding conditions. Their spacious and ergonomically designed operator cab provides a comfortable working environment with excellent visibility and controllability. The PC400-7 and PC450-7 excavators are renowned for their reliability, efficiency, and operator comfort. Their advanced hydraulic system delivers smooth and precise control, enabling operators to perform intricate tasks with ease. The Komatsu EMMS (Engine and Machine Management System) provides real-time monitoring of key machine functions, while the ECO mode optimizes fuel consumption for improved efficiency. The excavators are equipped with a wide range of optional attachments, including breakers, grapples, and buckets, allowing for customization to suit specific job requirements. Their robust construction, advanced features, and versatility make them ideal for a wide range of applications, including digging, loading, demolition, and material handling.