This service manual/repair guide for the Komatsu Limited D20 and D21 can assist you in fixing your used bulldozer.
Specs and Product-Details:
Pages: 668
This manual applies to the following models: Komatsu Limited
D20Pl-7 with 4D94E-1 Series Engine S/N 62001-UP
D20PLL-7 with 4D94E-1 Series Engine S/N 62001-UP
D20AG-7A with 4D94E-1 Series Engine S/N 75001-UP
D20P-7A with 4D94E-1 Series Engine S/N 75001-UP
D20PG-7A with 4D94E-1 Series Engine S/N 75001-UP
D21A-7 with 4D94E-1 Series Engine S/N 75001-UP
D21AG-7 with 4D94E-1 Series Engine S/N 75001-UP
D21PG-7A with 4D94E-1 Series Engine S/N 75001-UP
D21P-7 with 4D94E-1 Series Engine S/N 80060-UP
D21S-7 with 4D94E-1 Series Engine S/N 61001-UP
D21QG-7 with 4D94E-1 Series Engine S/N 61001-UP
D21A-7T with 4D94E-1 Series Engine S/N 75001-UP
Manual Language: English
Manual format: PDF / e-book (zip)
Printable: Yes
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"Get Your Komatsu D20 and D21 Series Bulldozer Parts List and Manual in PDF Format"
This comprehensive parts list and manual in PDF format provides you with the essential information needed to maintain and repair your Komatsu D20 or D21 Series bulldozer.
10 tech specs about the Komatsu D20, D21 bulldozer:
1. Engine: The Komatsu D20, D21 bulldozer is equipped with a Komatsu S6D125E-2 diesel engine with a power output of 118 kW (158 HP) at 2,000 RPM.
2. Operating Weight: The operating weight of the Komatsu D20 is 19,200 kg (42,300 lbs), while the D21 has an operating weight of 19,800 kg (43,600 lbs).
3. Blade Capacity: The D20 and D21 both have a blade capacity of 3.2 cubic meters (4.2 cubic yards) with a maximum digging depth of 535 mm (21 in).
4. Hydraulic System: The Komatsu D20, D21 bulldozer features a highly efficient hydraulic system with a maximum flow rate of 246 liters per minute (65 gallons per minute).
5. Track System: The bulldozer is equipped with a durable track system with adjustable track tension, providing superior stability and maneuverability.
6. Operator Comfort: The operator cab is designed for comfort and visibility, with adjustable seat, air conditioning, and excellent visibility to the blade and work area.
7. Serviceability: The Komatsu D20, D21 bulldozer is designed for easy service and maintenance, with easy access to key components and a centralized grease bank for lubricating points.
8. Ground Clearance: The bulldozer has a ground clearance of 380 mm (15 in), making it ideal for rough terrain applications.
9. Blade Control: The bulldozer features hydraulic blade control for precise grading and excavation, with independent control of the blade tilt and angle.
10. Environmental Compliance: The Komatsu D20, D21 bulldozer is designed to meet emissions standards and is equipped with a diesel particulate filter to reduce exhaust emissions.
The Komatsu D20, D21 bulldozer is a complex machine that requires regular maintenance, repair, and troubleshooting to keep it in good working condition. One of the most important tools for performing these tasks is the service manual, which provides detailed instructions and diagrams for performing various operations. The manual is essential for understanding the basic operating principles of the bulldozer and for diagnosing and resolving common problems.
One of the most common issues with the Komatsu D20, D21 bulldozer is engine-related problems, such as low power, overheating, and excessive fuel consumption. These issues can be caused by a variety of factors, including worn or damaged engine components, clogged diesel particulate filters, or poor engine performance due to poor quality fuel. The service manual provides detailed information on troubleshooting these types of problems, including step-by-step instructions for repairing or replacing damaged components.
Another important aspect of maintaining the Komatsu D20, D21 bulldozer is keeping the wiring system in good condition. The service manual includes a wiring diagram that provides a comprehensive overview of the electrical system, including the locations of all components, their functions, and how they are connected to each other. The wiring diagram is an important tool for troubleshooting electrical problems and for repairing or replacing damaged components.
In addition to engine-related problems and electrical issues, the Komatsu D20, D21 bulldozer is also prone to hydraulic problems, such as leaks, blockages, or low pressure. The service manual provides detailed information on diagnosing and resolving these types of problems, including step-by-step instructions for repairing or replacing damaged components. It is also essential to use high-quality hydraulic fluid and to change it regularly to ensure optimal performance and to reduce the risk of hydraulic problems.
Regular maintenance is also an important part of keeping the Komatsu D20, D21 bulldozer in good working condition. The service manual includes a parts list that provides detailed information on all the components of the bulldozer, including their specifications, functions, and recommended replacement intervals. Regular maintenance, such as checking fluid levels, tightening bolts and nuts, and replacing worn or damaged parts, can help extend the life of the bulldozer and minimize the risk of costly repairs.
Maintaining and repairing the Komatsu D20, D21 bulldozer requires a comprehensive understanding of its various components and systems. The service manual provides a valuable resource for performing these tasks, including detailed information on troubleshooting, repairing, and maintaining various components. The manual is available in pdf format for easy access and downloading, making it a useful tool for those who need to keep their bulldozer in good working condition.
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