This comprehensive Komatsu GD661A-1, GD663A-1, and GD672A-1 Grader Factory Service Repair Manual provides essential information for technicians and mechanics working on these models. It covers a wide range of topics, including detailed maintenance procedures, troubleshooting guides, wiring diagrams, component specifications, and exploded views. This manual is designed to help you diagnose and repair issues effectively, ensuring your Komatsu grader operates at peak performance. The manual covers all models with serial numbers starting at 10001 for the GD661A-1, 30001 for the GD663A-1, and 20001 for the GD672A-1. With its in-depth coverage and clear illustrations, this manual is an invaluable resource for anyone who needs to service or repair Komatsu GD661A-1, GD663A-1, or GD672A-1 graders.

## Komatsu GD661A-1, GD663A-1, and GD672A-1: Powerful Graders for Demanding Projects The Komatsu GD661A-1, GD663A-1, and GD672A-1 are heavy-duty motor graders designed for large-scale construction and infrastructure projects. These machines are known for their exceptional power, durability, and versatility, making them ideal for a wide range of applications including road construction, earthmoving, and site preparation. The GD661A-1, boasting a powerful Komatsu SAA6D140E-3 engine, delivers 224 horsepower and utilizes a robust 6-speed powershift transmission for smooth and efficient operation. The GD663A-1, on the other hand, features the more powerful Komatsu SAA6D170E-3 engine, generating 260 horsepower, while maintaining the same reliable 6-speed powershift transmission. Finally, the GD672A-1, with its impressive Komatsu SAA6D170E-3 engine, delivers 260 horsepower and incorporates a 7-speed powershift transmission for even greater control and efficiency. These Komatsu graders are equipped with a range of advanced features designed to enhance productivity and operator comfort. The spacious cab offers excellent visibility and ergonomic controls, while the hydraulically controlled blade and moldboard provide precise grading and shaping capabilities. The machines are also equipped with a robust undercarriage, featuring durable tracks and rollers, to withstand even the most demanding working conditions. Additionally, the GD661A-1, GD663A-1, and GD672A-1 all boast a sophisticated hydraulic system, ensuring smooth and responsive operation, and are engineered with a focus on safety and operator comfort, incorporating features like a well-ventilated cab, protective structures, and numerous safety interlocks. These innovative features make these Komatsu graders highly sought-after for their performance, reliability, and operator comfort in challenging environments.