KOMATSU GD670A MOTOR GRADERS

Technical Description

The 1998 KOMATSU GD670A Motor Grader is a robust, heavy-duty machine designed for demanding grading applications. Powered by a Caterpillar C13 diesel engine, it offers net power between 176–196 hp, with engine speed rated at 1,850 rpm and available in configurations meeting Tier 2/Stage II Equivalent or up to Tier 4 Final/Stage IV Ultra Low Sulfur Diesel standards. The engine features a maximum fan speed of 1,600 rpm and a minimum of 550 rpm, supporting operation in ambient temperatures up to 122°F (50°C). The grader’s frame achieves a top speed of 31.4 mph forward and 24.8 mph in reverse. The circle diameter is 71.7 in, with a blade beam thickness of 2 in and a blade height of 25–27 in. Moldboard length options include 12 ft and 14 ft, with a maximum blade position angle of 40° forward and 5° backward. Blade side shift is 26.1 in left and 20.2 in right, with a maximum cut depth of 28.9 in and a lift above ground of 18.9 in. The hydraulic system is closed center, parallel circuit, with a variable piston pump delivering 40.9 gal/min at 2,200 rpm and system pressure of 3,500 psi. Fluid capacities include 23.5 gal for transmission/differential/final drives and 26.4 gal per tandem housing. The front axle lean angle is 18° left and right, and the maximum steering angle is 47.5°. The rear scarifier has a working width of 84.1 in, nine shanks spaced 9.8 in apart, and a maximum scarifying depth of 11.1 in. Operating weight ranges from 32,000 to 51,300 lbs, with service intervals at 500 hours for engine oil/filter and 1,000–2,000 hours for transmission/differential oil/filter.