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Figure 10-7.-Blade heel and toe.
Grader Operations

Equipment Operator Basic - Beginning construction equipment operators manual
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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 position by curved brackets, called circle knees  and side  shift guides, as shown in figure 10-6. They are attached to the underside of a rotatable ring, called the  circle. Cycle The circle is a tooth-ring gear that is rotated in a supporting frame by the circle reverse mechanism. The circle  teeth  may  be  internal  (fig.  10-8,  view  A)  or external  (fig.  10-8,  view  B),  depending  on  the  make  and model  of  the  grader. The circle is turned by a spur-pinion gear (fig. 10-9) that meshes with the circle teeth. The spur-pinion gear is held by the drawbar and is controlled by a lever in the operator’s cab. Engaging the spur-pinion gear allows rotating the circle to the desired blade angle position. Drawbar The  drawbar   is  a  V-  or  T-shaped  connection between the front of the grader frame and the circle (fig. 10-10).  The  drawbar  holds  the  circle  rigid  and  is fastened  by  a  ball  and  socket  that  allows  angular movement from side to side and up and down (fig. 10-11). The drawbar carries the full-horizontal load on the blade. Other components provide vertical and side support. Scarifier The scarifier is a hydraulically controlled unit with a set of teeth used to break up material too compacted 10-5 ~.---  ---  yv . . v. “Uv..v. -.*”   “KXVUS8UA8XL    AVLbb  WA  UIG







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