CATERPILLAR 120G MOTOR GRADERS

Technical Description

The 1980 Caterpillar 120G Motor Grader is a robust, heavy-duty machine engineered for precision grading and earthmoving tasks. It features a 12.08 ft moldboard with a 24 in height and 0.87 in thickness, providing a durable cutting edge and a 16.3 in arc radius for smooth grading. The throat clearance is 6.5 in, allowing for efficient material handling. Powered by a Cat C9.3 engine, it delivers a base net power of 179 hp in 1st gear and up to 231 hp in VHP Plus mode at 2,000 rpm, with a maximum torque of 840 lb-ft. The engine is a 6-cylinder, in-line configuration with a 567.5 in³ displacement, 4.5 in bore, and 5.9 in stroke, meeting U.S. EPA Tier 4 Final and EU Stage V emissions standards. The transmission offers 8 forward and 6 reverse gears, supporting a top forward speed of 31.4 mph and reverse speed of 24.8 mph. Hydraulic output is 24,192 kPa via a variable piston pump. The front steering reaches a maximum angle of 47.5°, with a 20° frame steering angle left or right, and a 32° total front axle oscillation. The front axle can lean 18° left and right. The maximum depth of cut is 28.9 in (standard) or 28.1 in (top adjust), with a maximum lift above ground of 18.9 in. The moldboard side shift is 26.1 in left and 20.3 in right, and the blade can rotate 360° with a maximum tip forward of 40° and backward of 5°. The machine is rated for operation up to 10,000 ft altitude and can handle high ambient temperatures up to 122°F.