This comprehensive Komatsu D31EX-21, D31PX-21, D37EX-21, and D37PX-21 Dozer Service Manual provides in-depth technical information for servicing and maintaining these powerful machines. The manual includes detailed step-by-step instructions, electrical and hydraulic diagrams, and numerous high-quality illustrations and schematics. The thorough documentation equips technicians and operators with the essential knowledge for performing routine maintenance, troubleshooting issues, and conducting complex repairs with confidence.

The Komatsu D31EX-21, D31PX-21, D37EX-21, and D37PX-21 are powerful and versatile crawler dozers designed for a wide range of construction and earthmoving applications. These machines boast impressive performance capabilities, thanks to their robust engine and advanced hydraulic system. The D31EX-21 and D37EX-21 models are equipped with a powerful Komatsu SAA4D107E-1 engine, while the D31PX-21 and D37PX-21 models feature the Komatsu SAA4D107E-3 engine, both delivering exceptional torque and horsepower. These engines are known for their efficiency and reliability, minimizing fuel consumption and maximizing productivity. The hydraulic system, designed for smooth and responsive operation, provides ample power to the blade and other attachments for efficient grading, digging, and material handling.

Komatsu has designed these dozers with operator comfort and safety in mind. The spacious and ergonomically designed cab offers excellent visibility and control, ensuring the operator can work efficiently and safely. The intuitive control system provides precise and responsive operation, allowing for effortless maneuverability and precise grading. The operator can adjust the blade settings and hydraulic flow to match the specific application, ensuring optimal performance. Furthermore, the dozers are equipped with a comprehensive safety system, including a roll-over protection structure (ROPS) and a falling object protection structure (FOPS), providing maximum protection for the operator in hazardous situations. These features, combined with Komatsu's renowned build quality and durable construction, make the D31EX-21, D31PX-21, D37EX-21, and D37PX-21 reliable and efficient workhorses for any construction project.