This comprehensive Komatsu PC300-5, PC300LC-5, PC300-5 MIGHTY, PC300LC-5 MIGHTY, PC300HD-5, PC400-5, PC400LC-5, PC400-5 MIGHTY, PC400LC-5 MIGHTY, PC400HD-5 Hydraulic Excavator Service Shop Repair Manual provides detailed instructions for maintaining, assembling, disassembling, and servicing your Komatsu excavator. The manual covers a wide range of topics, including: **Structure and Function:** This section provides a thorough understanding of the excavator's design, components, and their respective functions. **Testing and Adjusting:** This section details the procedures for performing various diagnostic tests and adjustments on the excavator's systems. **Disassembly and Assembly:** The manual includes comprehensive step-by-step instructions for disassembling and reassembling various components, making repair and maintenance tasks efficient and accurate. **Maintenance Standards:** This section outlines recommended maintenance practices and procedures, ensuring optimal performance and longevity of your Komatsu excavator. The manual encompasses a wide range of machine serial numbers, ensuring compatibility with various models within the PC300-5 and PC400-5 series. It also provides specific details related to the SA6D108-1 engine (PC300-5 series) and the S6D125-1 engine (PC400-5 series). For in-depth engine-specific information, refer to the 108 Series and 125 Series Engine Shop Manuals, respectively. This service manual is an invaluable resource for both experienced technicians and DIY enthusiasts, enabling you to effectively troubleshoot, repair, and maintain your Komatsu excavator. The numerous illustrations, diagrams, and real photographs facilitate a clear understanding of each procedure, ensuring efficient and successful repairs.

The Komatsu PC400-5 is a powerful and versatile hydraulic excavator designed for demanding construction and earthmoving applications. It is a workhorse in the heavy equipment industry, renowned for its robust construction, high productivity, and reliable performance. This model is part of Komatsu's renowned PC400 series, featuring several variations including the PC400LC-5, PC400-5 MIGHTY, PC400LC-5 MIGHTY, and PC400HD-5, each tailored to specific needs. The PC400-5 offers impressive digging and lifting capabilities, powered by a powerful diesel engine and a sophisticated hydraulic system. Its robust undercarriage and durable components ensure long-lasting operation even in challenging work environments. The PC400-5 boasts a range of features that enhance its performance and operator comfort. These include a spacious and ergonomic cab with excellent visibility, a user-friendly control system, and an advanced hydraulic system that optimizes digging force and lifting capacity. Its versatility is further enhanced by the availability of a wide range of attachments, including buckets, breakers, grapples, and rippers, allowing operators to tackle diverse tasks with efficiency and precision. Whether it's excavating large volumes of earth, loading trucks, or demolishing structures, the PC400-5 proves its mettle through its raw power, operational efficiency, and unwavering reliability, making it a highly sought-after machine in the construction and mining industries.