This comprehensive Komatsu PC78UU-6 and PC78US-6 Hydraulic Excavator Service Repair Manual provides detailed instructions for maintaining, assembling, disassembling, and servicing your machine. This manual, covering serial numbers 22832 and up for the PC78UU-6 and 4001 and up for the PC78US-6 (including 4809 and up for Norway and EU models), contains detailed specifications, diagrams, and actual photographs to guide you through every step of the repair process.

The manual focuses on the 4D95LE-2 and S4D95LE-3-A engines powering these models, with specific references to the 95-2 and 95-3 Series Engine Shop Manual for engine-related information. A dedicated section (Section 50) in the manual covers parts that differ from the standard model for the PC78US-6 for Norway.

The manual is structured for ease of use, with chapters covering:

* **General Information:** Provides an overview of the excavator.
* **Structure, Function, and Maintenance Standards:** Explains the machine's design and maintenance practices.
* **Testing and Adjusting:** Outlines procedures for testing and adjusting components.
* **Disassembly and Assembly:** Offers step-by-step guidance for taking apart and putting together various parts.
* **Other Specifications for Norway:** Dedicated section for Norway-specific model variations.
* **Other Information:** Includes supplementary details and resources.

This manual empowers you to troubleshoot, repair, and maintain your Komatsu excavator effectively, saving you time and money. It contains all the information you need to keep your machine operating at peak performance.

The Komatsu PC78UU-6 and PC78US-6 are compact hydraulic excavators designed for a variety of tasks in construction, demolition, and landscaping. With their robust build and efficient hydraulic system, these machines offer impressive digging and lifting capabilities, making them suitable for projects ranging from trenching and foundation work to material handling and landscaping. Both models boast a powerful engine and a comfortable operator cabin, prioritizing efficiency and operator comfort.

The PC78UU-6 and PC78US-6 share several key features, including a powerful engine delivering ample power for various applications, a spacious and ergonomically designed operator's cabin with excellent visibility, and a robust undercarriage with a wide track base for enhanced stability. These excavators are also known for their reliability and durability, thanks to Komatsu's renowned engineering and high-quality components. However, the PC78UU-6 is designed for general excavation tasks, while the PC78US-6 is specifically built for utility work, featuring a shorter boom and smaller counterweight for working in confined spaces. This specialized design enables the PC78US-6 to operate efficiently in utility projects like trenching for pipes and cables, making it a valuable asset for infrastructure and utility companies.