This comprehensive manual provides in-depth information for maintaining, assembling, disassembling, and servicing your Komatsu D85A-21, D85E-21, and D85P-21 bulldozers. It covers a wide range of topics to help you achieve peak performance through effective, economical, and safe machine operation and maintenance.

The Service Repair Manual includes detailed instructions and data specific to these models, complete with specifications, diagrams, and real-life photo illustrations. This comprehensive resource guides you through step-by-step repair procedures, diagnosing issues, servicing, technical maintenance, and troubleshooting. It equips you with the necessary knowledge to identify and address problems, understand repair processes, and maintain your machine efficiently without needing to rely on external service providers.

The Operation & Maintenance Manual focuses on practical aspects of operating, handling, lubricating, maintaining, checking, and adjusting your bulldozer. This manual empowers both operators and maintenance personnel to maximize machine performance, ensuring efficient, cost-effective, and safe operation.

The manual covers a wide range of topics, including:

**Service Repair Manual:**

* **General:** This section provides foundational information about the bulldozer and its systems.
* **Engine:** This section delves into the details of the S6D125-1 and S6D125-2 engines, specifically designed for the D85A-21, D85E-21, and D85P-21 models. For more in-depth engine information, refer to the separate 6D125 Series and 125-2 Series Engine Shop Manual.
* **Power Train:** This section covers the transmission, axles, and other components associated with power transfer and drivetrain.
* **Undercarriage:** This section focuses on the tracks, rollers, sprockets, and other components of the bulldozer's undercarriage.
* **Hydraulic System:** This section covers the hydraulic pumps, valves, cylinders, and other components that control the bulldozer's movement and functions.
* **Work Equipment:** This section details the blade, ripper, and other attachments used for specific tasks.
* **Electrical System:** This section covers the wiring, sensors, and electrical components of the bulldozer.
* **Others:** This section may include additional information related to the bulldozer's operation and maintenance.

**Operation & Maintenance Manual:**

* **Foreword:** An introduction to the manual and its purpose.
* **Safety Information:** Essential safety guidelines to be followed during operation and maintenance.
* **Introduction:** Overview of the bulldozer and its main components.
* **Location of Plates, Table to Enter Serial No. and Distributor:** Information about locating identification plates and serial numbers.
* **Contents:** Table of contents detailing the manual's structure.
* **Safety:**
* **General Precautions:** General safety guidelines for handling the bulldozer.
* **Precautions During Operation:** Specific safety precautions to be observed while operating the bulldozer.
* **Precautions for Maintenance:** Safety measures to be taken during maintenance procedures.
* **Position for Attaching Safety Labels:** Instructions for placing safety labels on the bulldozer.
* **Operation:**
* **General View:** Overview of the bulldozer's layout and components.
* **Explanation of Components:** Detailed explanations of the functions of each component.
* **Operation:** Detailed instructions on operating the bulldozer, including starting, stopping, and various functions.
* **Transportation:** Guidelines for transporting the bulldozer.
* **Cold Weather Operation:** Instructions for operating the bulldozer in cold climates.
* **Long-Term Storage:** Instructions for storing the bulldozer for extended periods.
* **Troubleshooting:** Common problems and their potential solutions.
* **Maintenance:**
* **Guides to Maintenance:** General guidelines for maintaining the bulldozer.
* **Outlines of Service:** Recommended service intervals and procedures.
* **Wear Parts List:** List of common wear parts and their replacement frequencies.
* **Use of Fuel, Coolant and Lubricants According to Ambient Temperature:** Guidelines for using appropriate fluids in different temperatures.
* **Standard Tightening Torques for Bolts and Nuts:** Recommended tightening torques for bolts and nuts.
* **Periodic Replacement of Safety Critical Parts:** Safety-critical parts that require regular replacement.
* **Maintenance Schedule Chart:** Detailed maintenance schedule chart.
* **Service Procedure:** Step-by-step instructions for performing various maintenance procedures.
* **Specifications:** Technical specifications relevant to the bulldozer.
* **Options, Attachments:**
* **General Precautions:** Specific safety precautions for using options and attachments.
* **Using Seat Belt:** Instructions for using the seat belt.
* **Handling Cap with Lock:** Guidelines for handling and using the locking cap.

The Komatsu D85A-21, D85E-21, and D85P-21 are powerful track-type tractors, more commonly known as bulldozers, designed for heavy-duty earthmoving operations. These machines are built with a robust frame, powerful engine, and durable undercarriage, enabling them to handle a wide range of construction and mining tasks. The D85A-21 is a standard configuration bulldozer, while the D85E-21 features a larger engine and enhanced performance. The D85P-21, on the other hand, is a specialized model designed for mining applications, featuring a longer track frame and a more powerful engine. All three models are equipped with a hydraulic system that powers the blade, ripper, and other attachments, enabling precise control and efficient operation.

The D85 series boasts numerous features designed to enhance productivity and operator comfort. These include a spacious and ergonomic operator cab with excellent visibility, advanced control systems for precise operation, and a powerful engine providing efficient and reliable power delivery. The bulldozers are also equipped with a variety of safety features, such as a rollover protection structure (ROPS), fall protection, and emergency brakes, making them suitable for demanding and challenging work environments. The D85A-21, D85E-21, and D85P-21 are popular choices in various industries, including construction, mining, forestry, and agriculture, due to their versatility, reliability, and performance. They play a crucial role in shaping the landscape, creating infrastructure projects, and extracting valuable resources. The combination of their robust build, advanced technology, and operator-friendly features makes them ideal for a wide range of earthmoving applications, achieving high productivity and efficiency.