This comprehensive manual provides a complete guide for servicing, repairing, operating, and maintaining Komatsu D31EX-21, D31PX-21, D37EX-21, and D37PX-21 bulldozers. It encompasses essential information for both experienced mechanics and operators, covering everything from troubleshooting and repair procedures to routine maintenance schedules and safety guidelines. The manual is meticulously organized, presenting detailed diagrams, illustrations, and explanations for each component and system, making it easy to locate the information you need. Whether you're tackling a major overhaul or performing routine checks, this manual ensures you have the knowledge and resources to keep your Komatsu bulldozer running efficiently and reliably.

The Komatsu D31EX-21, D31PX-21, D37EX-21, and D37PX-21 bulldozers are powerful and versatile machines designed for a wide range of earthmoving applications. These models are part of Komatsu's renowned line of crawler tractors, known for their durability, reliability, and operator comfort. The D31EX-21 and D31PX-21 are mid-size bulldozers, while the D37EX-21 and D37PX-21 offer larger capabilities. They are characterized by their robust construction, powerful engines, and advanced hydraulic systems. These bulldozers are equipped with a variety of optional attachments, including blades, rippers, and winches, allowing them to handle diverse tasks such as site preparation, material handling, and land clearing.

The D31EX-21 and D31PX-21 models are powered by Komatsu's SAA4D107E-1 engine, while the D37EX-21 and D37PX-21 are equipped with the SAA6D107E-3 engine. These engines offer ample power and torque for efficient operation. The bulldozers feature a sophisticated hydraulic system that provides precise control of the blade and other attachments. They also incorporate advanced features to enhance operator safety and comfort, such as a spacious and ergonomically designed cab, a clear all-around view, and a comfortable operator seat. The D31EX-21 and D37EX-21 are equipped with a standard blade, while the D31PX-21 and D37PX-21 feature a semi-U blade. These models are designed for demanding work environments and are widely used in various industries, including construction, mining, and forestry.