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How to Diagnose V -Belt Failure <br />Condition <br />Cause <br />Prevention <br />Oil deterioration <br />Oil -softened rubber <br />Splash guards will protect drives <br />against oil <br />Cover fabric rupture <br />Cover fabric ruptured when belt <br />Proper installation of belts by <br />was pried over sheave during <br />moving motor so belts do not <br />installation <br />have to be pried into the grooves <br />Slip burn <br />Belt too loose. Belt didn't move, <br />Maintain proper tension on the <br />friction against sheave burned <br />drive. <br />rubber. When belt finally <br />grabbed, it snapped. <br />Base cracking <br />Severe back -bend idlers. <br />Check storage conditions. If <br />Improper storage. Excessive <br />back -bend idler can not be <br />ambient operating temperature. <br />avoided, install idler of larger <br />diameter. Avoid ambient <br />temperature over 140 degrees. <br />Ply separation <br />Split along pitch line indicating <br />Redesign drive using sheaves of <br />belt ran over too small a sheave <br />proper size <br />Ruptured <br />Ruptured cords in the plies <br />Check for rocks or tools falling <br />into sheave grooves. Check <br />tension. Belts loose enough to <br />twist in groove can rupture cords. <br />Worn belt sides <br />Misalignment. Grit or dirt. <br />Align sheaves. Replace belts as <br />Normal wear. <br />required. <br />Snub break <br />Cover wear indicates slip. Clean <br />Maintain proper tension on the <br />break reveals sudden snap. <br />drive. <br />Distorted Belt <br />Breakdown of adhesion or <br />Do not pry belts on drives. Check <br />broken cords <br />sheaves for recommended <br />diameters. <br />Abrasion <br />Foreign material and rust in <br />Dust guards help protect against <br />sheaves wore away sidewalls, <br />abrasion. Tension must be <br />letting belt drop to bottom of <br />maintained in dusty atmosphere. <br />groove. <br />Pcs/o&m/v-belt-maint- 1 -5 <br />