Komatsu has introduced the new GD955-7 motor grader to the North American market, saying the machine offers operators the control and precision needed to build and maintain haul roads for truck fleets of 100 tons (91 t) and up.

This powerful new machine stands out with its 426 horsepower at 1,900 rpm (313 kW at 1,900 rpm) and powerful blade downforce pressure for efficient grading performance, the OEM says. It comes with an operating weight of 47,320 kg and a standard 5.5-m moldboard (6.1-m moldboard is optional).

“With faster working travel speeds compared to the previous model, Komatsu engineered the GD955-7 to increase grading efficiency while helping reduce maintenance requirements and total cost of ownership,” it said.

Despite its large size, the GD955-7 offers excellent manoeuvrability, executing tight U-turns on a standard 91-t class haul road without the need to fully cut the wheel or course correct, the company says. The long wheelbase and large, 27° articulation angle allow a tight turning radius and provide manoeuvrability for narrow haul road applications in confined spaces and around obstacles.

The newly adopted, long-life circle bearing allows for smooth and precise rotation of the moldboard while eliminating the need for circle play adjustments or replacing wear plates, Komatsu added. Coupled with a standard auto-lubrication system, the GD955-7 is engineered to help reduce planned and unplanned maintenance downtime while helping to extend life to overhaul.

“With significant increases in operating weight, blade downforce pressure and working travel speeds, this new size class motor grader will be a smart choice for increased efficiency on our customer’s mine sites,” Joseph Sollitt, Director of Mining Support Equipment at Komatsu Ltd, said.