The motor grader is used to establish final grades on construction projects requiring earthmoving, and often is used to maintain unpaved roads. A road grader blade is mounted beneath the frame with a hydraulically controlled mechanism that allows multiple, precision adjustments. Blade width varies from 8 to 24 feet.
The blade is the motor grader’s primary work tool, but most grader equipment also can use other tools, such rear-mounted rippers, scarifiers, or compactors, as well as front-mounted blades that might be used to plow snow.
Motor graders, also known as road graders, range in size from 120 horsepower and operating weight around 13,000 pounds, to more than 500 horsepower weighing in at more than 150,000 pounds.
The blade is the motor grader’s primary work tool, but most models also can use other tools, such rear-mounted rippers, scarifiers, or compactors, as well as front-mounted blades that might be used to plow snow.
Typical motor grader design uses three axles, with the engine and cab mounted on the rear frame above the two rear axles (configured in a tandem arrangement) and a third axle at the front.
Grade-control systems range from those using 2D technology, which provides guidance to the op-erator (via an in-cab display) about the position of the blade relative to the finished grade, to auto-mated 3D systems that use digital site plans (including design surfaces, grades, and alignments) in combination with GNSS (global navigation satellite system) technology or universal total stations to automatically control the machine’s hydraulic functions.