KOMATSU GD521A-1 MOTOR GRADERS

The Komatsu GD521A-1 motor grader is a robust machine designed for heavy-duty earthmoving tasks. It features an overall length of 26.8 feet, a width over tires of 7.9 feet, and a wheelbase of 19 feet, providing stable and balanced operation. The blade base measures 8.4 feet, with a moldboard width of 12.2 feet and height of 25.4 inches, facilitating precise grading and cutting. Powered by a Komatsu S6D105 six-cylinder diesel engine with a displacement of 396.1 cubic inches, it delivers a maximum power output of 135.5 hp at 2500 rpm, ensuring strong performance under load. The machine’s fuel capacity is 60 gallons, supporting extended operation without frequent refueling. Weighing 23,810 pounds, it combines power and mobility with a front axle ground clearance of 1.2 feet and a rear ground clearance of the same height, allowing effective navigation of uneven terrain. The steering system features a 27-degree articulation angle for enhanced maneuverability, achieving a turning radius of 21.7 feet. The transmission offers six forward gears, enabling a maximum forward speed of 27.8 mph and a reverse speed of 33.9 mph. Tires are sized 13.00-24-8PR suitable for rugged environments. The machine’s cab height is 11.5 feet to the top of the isomount cab, providing the operator with good visibility and comfort. Overall, the Komatsu GD521A-1 blends efficient powertrain, precise grading capability, and operator-centered design for effective performance in construction and road maintenance applications.