This comprehensive Service Repair Manual provides in-depth information on the Komatsu D85C-21 (For -50°C Specification) Pipelayer, specifically for machines with serial numbers 36551 and up. This manual is a valuable resource for technicians and mechanics, offering detailed guidance on maintaining, assembling, disassembling, and servicing this complex piece of equipment. It covers the entire machine, including the S6D125-2 engine.

The manual is divided into four main sections:

* **General:** This section lays out general information about the D85C-21 Pipelayer, including safety precautions, specifications, and terminology.
* **Structure and Function:** Dive deeper with comprehensive explanations of the machine's components and their functions. Detailed diagrams and illustrations help users understand the intricate workings of the Pipelayer.
* **Testing and Adjusting:** This section provides step-by-step instructions for testing and adjusting various systems and components, ensuring optimal performance and safety.
* **Disassembly and Assembly:** Detailed procedures for dismantling and reassembling components are thoroughly documented with clear illustrations. This helps technicians perform repairs and maintenance effectively.
* **Maintenance Standard:** Includes comprehensive maintenance schedules, lubrication charts, and recommended procedures to ensure long-term reliability and performance of the D85C-21 Pipelayer.

This Service Repair Manual is designed to empower users with the knowledge needed to troubleshoot, diagnose, service, and maintain their Komatsu D85C-21 Pipelayers, reducing reliance on external service providers and saving time and money.

The Komatsu D85C-21 Pipelayer, specifically the -50°C specification model, is a robust and powerful machine designed for heavy-duty pipelaying operations in extremely challenging environments. This model is built to withstand the rigors of working in sub-zero temperatures, featuring specialized components and systems that ensure reliable performance even in the most extreme conditions. The D85C-21 boasts a powerful engine capable of delivering ample torque for efficient pipeline installation, while its advanced hydraulics provide precise control of the boom and carriage for accurate pipe placement. A heavy-duty undercarriage equipped with durable tracks ensures excellent traction and stability on uneven terrain, further enhancing its operational capabilities in demanding environments. This machine incorporates features like a heated cab and specialized cold-weather fluids, ensuring operator comfort and operational efficiency even in the most frigid weather conditions.

Beyond its robust construction and cold-weather capabilities, the D85C-21 Pipelayer is known for its impressive versatility. Its versatile boom design allows for a wide range of pipe sizes to be handled efficiently, making it suitable for a variety of pipelaying projects. The machine's advanced control systems provide operators with precise control over the boom and carriage, enabling them to place pipes with accuracy and minimize potential damage to surrounding infrastructure. This, combined with its powerful engine and durable design, makes the Komatsu D85C-21 Pipelayer an ideal choice for large-scale pipelaying projects across diverse terrains and climates, particularly in regions with extremely cold weather conditions. Its impressive performance, combined with its robust construction and cold-weather adaptations, positions it as a reliable and efficient solution for meeting the demands of heavy-duty pipelaying operations in even the harshest environments.