Prime Moverwheel at a time. Having the capability to operate in thismanner, one rear wheel can raise or lower, while theThe prime mover is a rubber-tired tractor,other remains on the same level with the front wheelspower-driven by a four- or six-cylinder diesel enginethereby holding the grader on a level terrain (fig. 10-2).mounted at the rear. The prime mover has four-rearThis is a very important feature. If the rest of the gradermounted single tires driven in tandem drive throughdoes not rise and fall when working uneven terrain, thegears and chains and a single-steering axle.grader blade does not vary its elevation, as the graderTANDEM DRIVE.— The tandem drive of thepasses over its work.grader allows climbing over rocks, logs, or humps, andARTICULATED FRAME STEERING.— Somepermits passing through depressions or ditches onegraders have frames that are hinged just forward of theFigure 10-2.—Tandem drive.Figure 10-3.—Articulated grader.10-2
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