| 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 handlling |
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 resplice. |
