This comprehensive service repair manual provides in-depth information for maintaining, assembling, disassembling, and servicing your Komatsu D31EX-21, D31PX-21, D37EX-21, D37PX-21, D39EX-21, and D39PX-21 bulldozers. It covers a wide range of topics related to these specific models, ensuring you have the necessary technical guidance for any repair or maintenance task.

The manual includes detailed specifications, diagrams, and actual real-life photo illustrations to guide you through each step of the process. It provides clear and concise instructions for diagnosing issues, performing repairs, and understanding the technical aspects of your machine. This manual is an invaluable resource for both professionals and DIY enthusiasts, allowing you to troubleshoot and repair your bulldozer efficiently and effectively.

This manual covers a broad spectrum of subjects, including:

* **General information:** Provides an overview of the bulldozer's structure and function, as well as essential maintenance standards.
* **Testing and Adjusting:** Includes instructions for conducting thorough tests and making necessary adjustments to ensure optimal performance.
* **Disassembly and Assembly:** This section offers detailed step-by-step procedures for taking apart and reassembling various components of the bulldozer, ensuring proper reassembly and functionality.
* **Other Essential Information:** Contains additional relevant information to enhance your understanding and troubleshooting capabilities.

This comprehensive service repair manual is an indispensable tool for anyone who owns or maintains Komatsu D31EX-21, D31PX-21, D37EX-21, D37PX-21, D39EX-21, and D39PX-21 bulldozers. It empowers you to perform repairs and maintenance tasks confidently, ultimately extending the life of your equipment and saving you time and money.

## Komatsu D31EX-21, D31PX-21, D37EX-21, D37PX-21, D39EX-21, D39PX-21 Bulldozers: Power and Precision for Demanding Tasks

The Komatsu D31EX-21, D31PX-21, D37EX-21, D37PX-21, D39EX-21, and D39PX-21 bulldozers are powerful and versatile machines designed to handle a wide range of demanding tasks in construction, mining, and forestry applications. These models are known for their robust construction, reliable performance, and exceptional operator comfort. The D31EX/PX-21 and D37EX/PX-21 models are equipped with a powerful 114 kW (153 hp) and 132 kW (177 hp) engine respectively, while the D39EX/PX-21 boast a high-output 157 kW (210 hp) engine, providing ample power for demanding tasks. The "EX" suffix indicates an electronically controlled transmission, while the "PX" models utilize a mechanical transmission. These bulldozers feature a hydrostatic steering system for precise control and maneuverability, allowing operators to navigate tight spaces and work efficiently in challenging terrain.

Beyond their impressive power and maneuverability, these Komatsu bulldozers prioritize operator comfort and safety. A spacious and ergonomically-designed operator station provides a comfortable working environment, minimizing fatigue during long shifts. The cab features a large windshield and strategically-placed mirrors, offering excellent visibility for increased situational awareness and safety. The comprehensive safety features include a rollover protection system, a falling object guard, and an operator presence detection system to further enhance operator safety. Komatsu's commitment to quality and reliability is evident in the construction of these bulldozers, featuring durable components and robust design for extended service life and minimal downtime. The D31EX/PX-21, D37EX/PX-21, and D39EX/PX-21 bulldozers are known for their exceptional reliability and performance, making them a dependable and valuable asset for any construction or heavy equipment fleet.