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The above conditions could also be caused by uneven wear of the grooves in the <br />sheave. These should be checked with sheave groove gages. <br />Inspect Sheaves Often <br />Keep all sheave grooves smooth and uniform. Burrs and rough spots along the <br />sheave rim can damage belts. Dust, oil and other foreign matter can lead to <br />pitting and rust and should be avoided as much as possible. If sheave sidewalls <br />are permitted to "dish out" the bottom "shoulder" ruins belts quickly by chewing <br />off their bottom corners. Also, the belt's wedging action is reduced and it loses <br />its gripping power. <br />A shiny groove bottom indicates that the sheave, the belt or both are badly worn <br />and the belt is bottoming in the groove. <br />Badly worn grooves cause one or more belts to ride lower than the rest of the <br />belts, and the effect is the same as with mismatched belts. This is called <br />"differential driving". The belts riding high in the grooves travel faster than the <br />belts riding low. In a drive under proper tension, a sure sigh of differential driving <br />is when one or several belts on the tight side are slack. <br />Check alignment of drive. Sheaves that are not aligned properly cause excessive <br />belt and sheave wear. When the shafts are not parallel, belts on one side are <br />drawn tighter and pull more than their share of the load. These overloaded belts <br />wear out faster, reducing the service life of the entire set. If the misalignment is <br />between the sheaves themselves, belts will enter and leave the grooves at an <br />angle, causing excessive cover and sheave wear and premature failure. <br />Belt and Sheave Gages <br />Belt and sheave groove gage sets are available form your local belt/sheave <br />supply house. <br />You can use them to determine the proper belt section by trying the old belt in <br />the various gages until a proper fit is obtained. The cross section of the <br />Conventional or Narrow -Wedge belt can be read form the gage. . <br />To check sheave grooves for wear, simply select the proper gage and template <br />for the sheave diameter: then insert the gage in the groove until the rim of the <br />gage butts against the outside diameter of the sheave flange. If more than 1/32" <br />of wear can be seen, poor V -belt life may be expected. <br />Check Belt Fit <br />Conventional V -belts should ride in standard sheave grooves so that the top <br />surface of the belt is just above the highest point of the sheave. In A -B <br />Pcs/o&m/v-be1t-maint-1-5 <br />