Figure 10-6.-Moldboard.Figure 10-7.-Blade heel and toe.tool of the grader that can be lifted, lowered. rotated.tilted forward and backward, shifted to one side or theother, and angled horizontal (fig. 10-6).The cutting edge and end bits are bolted to themoldboard. They act as wear plates and must bereplaced or reversed when worn or broken. In mostcases, the bolts will have to be replaced too.NOTE: Always keep enough cutting edges and endbits on hand to protect the moldboard from wear ordamage.The length of the blade is normally 12 or 14 feet.The curve shape of the blade causes dirt to roll and mix,as it is cut and moved. The rotary movement of the dirtcombined with the angle of the blade causes a side-castdrift of the material.When the blade is angled to position one end aheadof the other, two terms are used to designate the bladeends. They are the heel and the toe of the blade. Figure10-7 shows that the toe is the leading edge of the blade;Figure 10-8.—Circle.the heel is the trailing edge. When the blade is turnedso the toe is to your left, as you sit in the operator’sseat, the material will side cast to your right and spillFigure 10-9.-Spur-pinion gear.10-4
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