A motor grader is a type of large wheeled vehicle that is used to grade or level a field of rubble and soil. A large heat-treated blade is fitted to the rear of the motor grader. As the grader moves forward, the soil is sifted till it is leveled. A motor grader is different from a regular grader as its front plow can also pick up and move items. Motor graders are wheeled devices with pneumatic tires. The operator of this vehicle sits inside of a cabin at the top of the machine. This type of grader is commonly used in farming, road leveling, field and playground building, defense, construction and mining.
Motor graders are generally used in road surfacing applications such as asphalting. The concrete mix, asphalt or tar usually has to be leveled or graded after it has been excavated by a bulldozer or scraper. Motor prepare the base course of unpaved roads to create a wide flat surface for the asphalt to be placed on top of. They are also used to set native soil foundation pads to finish grade before the construction of buildings takes place. In the construction of housing developments and playgrounds, the soil is also first excavated by bulldozers or scrapers and then leveled using graders.
Motor graders are classified by their horsepower, the vehicle weight, the number of cylinders, their top speed, the extra number of blade sets that can be fitted and angle of the blade when it is in action. Most models of graders have engines in them that range in horsepower from 70 to 250 and the vehicle itself can weigh over 40,000 pounds.
The blades are angled in such a way that the debris flows smoothly. A small gap between the top soil and the blade ensures that the right amount of material is retained and the rest is either pushed forward or flows to the sides. Multiple blades, one behind the other ensures that the grading is refined.
Electronic throttle control is provided which makes the throttle easier to use and offers finer control. The electronic clutch pressure control allows smoother inching and provides consistent shifting of gears.
Graders are very heavy pieces of machinery and can be quite dangerous. They should only be operated by trained and qualified drivers.