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V -Drive Inspection and Maintenance Procedures <br />Well-designed and properly installed V -belt drives are without question the most <br />reliable and trouble free means of power transmission available. In general, and <br />except for an occasional retensioning, they will run year in and year out without <br />maintenance. <br />However, some do require periodic inspection and maintenance, both while the <br />drive is running and while it is stationary. <br />Inspection While Running <br />The slapping of belts against the drive guard or other obstruction can cause v - <br />drive noise. Check for an improperly installed guard, loose belts or excessive <br />vibration. Squealing of belts as a drive is started or while it is running is usually <br />( caused by a poorly tensioned drive and/or by a build-up of foreign material in the <br />sheave grooves. But it can also be caused by oil or grease between the belt and <br />the sheave groove. <br />If necessary, turn unit off to remove the belt guard and then turn back on and <br />watch the drive while it is running under load. (Caution: Observe only; stand <br />clear of the running drive!) Much can be learned by watching the action on the <br />slack side of the drive. Each variation in the driven load causes a corresponding <br />change in the tension of the slack side of the belt. During across -the -line starts or <br />suddenly applied loads while running, the sag on the slack side of the drive will <br />increase. If the sag under these conditions is excessive, tension should be <br />increased. <br />Any vibration in a system will cause the slack side of the belts to dance up and <br />down. Excessive vibration will also induce a vibration in the tight side of the <br />drive. The cause of the vibration should be determined and corrected. <br />If a set of belts is perfectly matched, all belts will have the same amount of sag. <br />However, perfection is a rare thing and there will usually exist some difference in <br />sag from belt to belt. It is more important to look at the tight side of a drive to be <br />sure that all of the belts are running tight. If one or more belts are running loose, <br />the drive needs to be retensioned, or the belts replaced with a matched set. <br />Pcs/o&m/v-belt-maint- 1 -5 <br />