This comprehensive collection of two manuals provides detailed information on the Komatsu D31EX-21 crawler excavator with serial numbers 50501 and up. The first manual, the Service Manual, is an essential resource for technicians and mechanics working on this machine. It includes detailed instructions and diagrams for maintenance, repair, and troubleshooting procedures. The manual covers all aspects of the D31EX-21, from its engine and hydraulics to its undercarriage and electrical system. The second manual, the Operating Manual, is designed for operators and provides guidance on the safe and efficient operation of the D31EX-21. It includes information on starting and stopping the machine, operating the controls, and performing basic maintenance tasks. Both manuals are written in a clear and concise style, making it easy to find the information you need.

The Komatsu D31EX-21 SN 50501 and up is a powerful and versatile crawler excavator designed for a variety of heavy-duty applications. This model is part of the D31EX series, which includes the D31EX-21 and D31EX-22, highlighting Komatsu's ongoing commitment to innovation and efficiency in the construction industry. The D31EX-21 SN 50501 and up incorporates a range of advanced features and technologies, including a robust hydraulic system, a powerful engine, and a spacious and comfortable operator cab. It is known for its exceptional digging force, lifting capacity, and maneuverability, making it an ideal choice for tasks such as excavation, loading, and demolition.

This excavator boasts a powerful engine that delivers impressive torque and horsepower, ensuring efficient operation even in challenging conditions. The hydraulic system is designed for optimal responsiveness and control, allowing for smooth and precise movements. The operator cab provides a comfortable and ergonomic working environment, featuring adjustable seats, climate control, and a comprehensive instrumentation panel. The D31EX-21 SN 50501 and up is also equipped with a range of safety features, including a robust structural design, emergency shut-off systems, and warning indicators. With its high-performance features and focus on operator safety, the Komatsu D31EX-21 SN 50501 and up is a highly reliable and productive machine that is well-suited for a wide range of demanding construction projects.