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Problems Reason & Corrections

What's the problem? Why it happens? The solution
1. Belt edge wear and broken excessively  1) Off centre loading Adjust chute to place load on centre of belt and discharge material in direction of belt moving.
2) Material Spillage and cumulation Improve loading and conveying conditions, install cleaning devices, improve maintenance.
3) Bowed belt For new belt this condition should disappear soon, otherwise the belt must be straightened or replaced. In the meanwhile, should check storage and handling situation.
4) Belt hitting structure Install training idlers on carrying and return sides.
5) Belt too rigid for adequate troughing Install a more flexible belt.
2. Stripping of cover 1) Impact of materials on belt Reduce impact by improving chute design, install impact idlers or impact bed.
2) Skirt board improperly adjusted or of wrong martial Adjust Skirt Board support to minimum 25 mm between metal and belt with gap increasing in direction of belt travel. Kindly note: use skirt board rubber (not old belt).
3. Severe pulley cover wear 1) Material trapped between belt and pulley Install scraper on return run ahead of tail pulley.
2) Spillage on drive pulley Increase tension, lag drive pulley, increase arc of contact.
3) Sticking Idlers. Free idlers and improve maintenance.
4. Cover harden or crack 1) Heat or chemical use condition Use belt designed for specific condition.
2) Improper storage or handling Refer proper storage and handling instructions.
5. Cover softening or swells in spots 1) Contamination by spilled grease, overlubrication of idlers Improve house-keeping, reduce quantity of grease used, check grease seals.
6. Cover bubbles 1) Cover cuts or very small punctures  Make spot repair with vulcanizer or self curing repair material.
7. Short breaks in carcass parallel to belt edge, start break in carcass 1) Impact of material on belt. Reduce impact by improving chute design, install impact idlers or impact bed.
2) Material trapped between belt and pulley Install scraper on return run ahead of tail pulley.
8. Transverse breaks 1) Belt edges folding up on structure Readjust idlers in affected area, install limit switches provide more clearance.
2) Improper transition between troughed belt and terminal pulley Adjust transition as recommended.
3) Severe convex, vertical curve. Decrease idler spacing in curve, increase curve radius
9. Lengthways carcass break with covers intact. 1) Belt running off centre and folding over Use limit switches and determine reasons for belt running out.
10. Belt breaks at or behind fasteners, fasteners pullout 1) Wrong type of fastener, fasteners too tight or too loose Use proper fasteners, set up schedule for regular fastener inspection.
2)Fastener plates too long for pulley size Replace with smaller fasteners, increase pulley size.
3) Tension too high Increase speed, reduce friction decrease tension by increase arc of contact. 
11. Ply separation 1) Pulley too small Use larger diameter pulleys.
2) Heat or chemical use condition Use belt designed for specific condition.
3) Too many reverse bends Use more flexible belt.
4) Mildew or dust penetration into carcass Prevent cuts, arrange for immediate repairs.
12. Particular section of belt runs to one side at all points on conveyor 1) Belt not joined squarely Remove affected splice and re-splice.

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