Figure 10-10.-Drawbar.Figure 10-11.-Ball-and-socket connection.off the heel. When the toe of the blade is to your right,the material will side cast to the left and spill off the heel.The moldboard is supported and held in positionby curved brackets, called circle knees and side shiftguides, as shown in figure 10-6. They are attached tothe underside of a rotatable ring, called the circle.CycleThe circle is a tooth-ring gear that is rotated in asupporting frame by the circle reverse mechanism. Thecircle teeth may be internal (fig. 10-8, view A) orexternal (fig. 10-8, view B), depending on the make andmodel of the grader.The circle is turned by a spur-pinion gear (fig. 10-9)that meshes with the circle teeth. The spur-pinion gearis held by the drawbar and is controlled by a lever inthe operator’s cab. Engaging the spur-pinion gear allowsrotating the circle to the desired blade angle position.DrawbarThe drawbar is a V- or T-shaped connectionbetween the front of the grader frame and the circle (fig.10-10). The drawbar holds the circle rigid and isfastened by a ball and socket that allows angularmovement from side to side and up and down (fig.10-11). The drawbar carries the full-horizontal load onthe blade. Other components provide vertical and sidesupport.ScarifierThe scarifier is a hydraulically controlled unit witha set of teeth used to break up material too compacted10-5~.--- --- yv . . v. “Uv..v.-.*” “KXVUS8UA8XL AVLbb WA UIG
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