This comprehensive Komatsu D21S-6A Bulldozer Repair Service Manual is designed for professional technicians, but also offers valuable information for DIY mechanics and anyone performing repairs and maintenance on this model. The manual caters to a range of abilities, providing clear instructions for those with a basic understanding of electrical and mechanical concepts. It's crucial to note that attempting complex repairs without proper knowledge and this manual could lead to unsafe operation and damage to the vehicle.

This manual serves as a detailed reference guide for maintaining and repairing your Komatsu D21S-6A Bulldozer. It covers all the essential topics typically found in factory service manuals and owner's manuals, providing step-by-step guidance through all repair procedures. Learn the same knowledge used by factory-trained technicians, covering critical specifications, illustrations, maintenance procedures, disassembly, assembly, cleaning, reinstalling procedures, and much more.

With this manual, you'll gain the confidence to make informed decisions about maintaining and repairing your Komatsu D21S-6A Bulldozer, ensuring your vehicle operates safely and efficiently.

## The Komatsu D21S-6A: A Versatile Workhorse for Construction and Earthmoving

The Komatsu D21S-6A is a robust and reliable crawler-type bulldozer designed for a wide range of construction and earthmoving tasks. This powerful machine boasts impressive performance capabilities, thanks to its 148-horsepower (110 kW) SAA4D107E-2 engine and its durable undercarriage. The D21S-6A is known for its exceptional maneuverability, ensuring efficient operation in confined spaces and challenging terrain. Its hydrostatic transmission system provides smooth and responsive control, allowing for precise maneuvering and efficient operation. Additionally, the D21S-6A features a spacious operator's cab designed for comfort and visibility, enhancing operator productivity and safety.

This versatile machine is equipped with a variety of attachments, including straight blades, semi-U blades, and angle blades, catering to different applications. The D21S-6A excels in tasks ranging from site preparation and leveling to material handling and clearing. Its robust construction and reliable performance make it an ideal choice for demanding environments, including construction sites, quarries, and mines. While primarily designed for general earthmoving, the D21S-6A's versatility allows it to be used for tasks like road building, landscaping, and even forestry applications. With its high level of durability and ease of maintenance, the D21S-6A is a cost-effective solution for contractors and businesses seeking a dependable and efficient workhorse in their fleet.