Find Useful
Questions & Answers
Check our FAQs for quick answers to frequently asked questions we receive.
If you have other questions write.
1. PROBLEM: Belt runs to one side at given point on structure
| REASON: ACTIONS: | Buildup of material on idlers Remove accumulation; improve maintenance; install scrapers or other cleaning devices |
| REASON: ACTIONS: | Sticking idlers Free idlers ands improve maintenance and lubrication |
| REASON: ACTIONS: | Idlers or pulleys out-of-square with centerline of belt Readjust idlers in affected area |
| REASON: ACTIONS: | Conveyor frame or structure crooked Straighten in affected area |
| REASON: ACTIONS: | Idler stands not centered on belt Readjust idlers in affected area |
| REASON: ACTIONS: | Structure not level Level structure in affected area |
3. PROBLEM: Belt runs to one side for long distance or entire length of the conveyor
| REASON: ACTIONS: | Belt running off-center around the tail pulley and through the loading area Install training idlers on the return side prior to the tail pulley |
| REASON: ACTIONS: | Off-center or poor loading Adjust chute to place load on center of belt; discharge material in direction of belt travel at or near belt speed |
| REASON: ACTIONS: | Buildup of material on idlers Remove accumulation; improve maintenance; install scrapers or other cleaning devices |
| REASON: ACTIONS: | Idlers or pulleys out of square with centerline of the belt Readjust idlers in the affected area |
| REASON: ACTIONS: | Conveyor frame or structure crooked Straighten in affected area |
| REASON: ACTIONS: | Idler stands not centered on belt Readjust idlers in affected area |
5. PROBLEM: Belt runs off at the head pulley
| REASON: ACTIONS: | Pulley lagging worn Replace the pulley lagging |
| REASON: ACTIONS: | Material spillage and buildup Improve loading and transfer conditions; install cleaning devices; improve maintenance |
| REASON: ACTIONS: | Idlers or pulleys out of square with centerline of the belt Readjust idlers in the affected area |
| REASON: ACTIONS: | Idler stands not centered on the belt Readjust the idlers in the affected area |
7. PROBLEM: Belt slip on starting
| REASON: ACTIONS: | Insufficient traction between the belt and pulley Lag the drive pulley; increase the belt wrap; install belt-cleaning devices |
| REASON: ACTIONS: | Counterweight too light Add counterweight or increase the screw take-up tension to value determined from calculations |
| REASON: ACTIONS: | Pulley lagging worn Replace the pulley lagging |
9. PROBLEM: Grooving, gouging or stripping of the top cover
| REASON: ACTIONS: | Skirt boards improperly adjusted or wrong material Adjust the skirt board supports to a minimum of 1” between metal and belt, with gap increasing in direction of belt travel; use skirt board rubber, not old belt |
| REASON: ACTIONS: | Belt spanking down under load impact Install cushion idlers |
| REASON: ACTIONS: | Material hanging up in or under the chute Improve loading to reduce spillage; install baffles; widen chute |
| REASON: ACTIONS: | Impact of material on the belt Reduce impact by improving the chute design; install impact idlers |
11. PROBLEM: Severe pulley cover wear
| REASON: ACTIONS: | Sticking idlers Free idlers; improve maintenance and lubrication |
| REASON: ACTIONS: | Slippage on the drive pulley Increase tension through screw take-up or add counterweight; lag the drive pulley; increase arc of contact |
| REASON: ACTIONS: | Material spillage and buildup Improve loading and transfer conditions; install cleaning devices; improve maintenance |
| REASON: ACTIONS: | Material trapped between the belt and pulley Install plows or scraper on return run ahead of tail pulley |
| REASON: ACTIONS: | Bolts heads protruding above lagging Tighten bolts; replace lagging; use vulcanized on lagging |
| REASON: ACTIONS: | Excessive forward tilt of trough rolls Reduce forward tilt of idlers no more than 2 degrees from vertical |
13. PROBLEM: Covers harden or crack
| REASON: ACTIONS: | Heat or chemical damage Use the belt designed for the specific condition |
| REASON: ACTIONS: | Improper storage or handling Refer to Goodyear Engineered Products for proper storage and handling instructions |
15. PROBLEM: Belt breaks at or behind fasteners; fasteners pull out
| REASON: ACTIONS: | Fastener plates too long for pulley size Replace with smaller fasteners; increase pulley size |
| REASON: ACTIONS: | Wrong type of fastener; fasteners too tight or too loose Use proper fasteners and splice technique; set up schedule for fastener inspection |
| REASON: ACTIONS: | Tension too high Increase belt speed, same tonnage; reduce tonnage, maintain same belt speed; reduce friction with better maintenance and replacement of damaged idlers; decrease tension by increasing arc of contact or go to lagged pulley; reduce the counterweight to minimum amount |
| REASON: ACTIONS: | Heat or chemical damage Use belt designed for specific conditions |
17. PROBLEM: Excessive edge wear, broken edges
| REASON: ACTIONS: | Off-center loading or poor loading Adjust chute to place the load on the center of the belt; discharge material in direction of belt travel at or near belt speed |
| REASON: ACTIONS: | Material spillage and buildup Improve loading and transfer conditions; install cleaning devices; improve maintenance |
| REASON: ACTIONS: | Belt hitting structure Install training idlers on carry and return run |
| REASON: ACTIONS: | Bowed belt For a new belt, this condition should disappear during break-in; in rare instances, the belt must be straightened or replaced; check storage and handling of belt rolls |
19. PROBLEM: Short breaks in carcass parallel to belt edge, star breaks in carcass
| REASON: ACTIONS: | Impact of material on the belt Reduce impact by reducing the chute design; install impact idlers |
| REASON: ACTIONS: | Material trapped between belt and pulley Install plows or scrapers on return run ahead of tail pulley |
21. PROBLEM: Carcass fatigue at idler junction
| REASON: ACTIONS: | Improper transition between troughed belt and terminal pulleys Adjust transition in accordance with Goodyear Engineered Products’ “Handbook of Belting” |
| REASON: ACTIONS: | Severe convex (hump) vertical curve Decrease idler spacing in curve; increase curve radius |
| REASON: ACTIONS: | Excessive forward tilt of troughed rolls Reduce forward tilt of idlers to no more than 2 degrees from vertical |
| REASON: ACTIONS: | Excessive gap between idler rolls Replace idlers; replace with heavier belt |
| REASON: ACTIONS: | Insufficient transverse stiffness Replace with the proper belt |
| REASON: ACTIONS: | Excess gap between idlers, causing load to work and shuffle on the belt as it passes over idlers Increase tension if unnecessarily low; reduce idler spacing |
2. PROBLEM: Particular section of belt runs to one side at all points on the conveyor
| REASON: ACTIONS: | Belt not spliced/joined squarely Remove affected splice and re-splice |
| REASON: ACTIONS: | Bowed belt For a new belt, this condition should disappear during break-in; in rare instances, belt must be straightened or replaced; check storage and handling of the belt rolls |
4. PROBLEM: Belt runs off at the tail pulley
| REASON: ACTIONS: | Belt running off-center around the tail pulley and through the loading area Install training idlers on the return side prior to the tail pulley |
| REASON: ACTIONS: | Material spillage and buildup Improve loading and transfer conditions; install cleaning devices; improve maintenance |
| REASON: ACTIONS: | Idlers or pulleys out of square with centerline of the belt Readjust idlers in the affected area |
6. PROBLEM: Belt slip
| REASON: ACTIONS: | Insufficient traction between the belt and pulley Lag the drive pulley; increase the belt wrap; install belt-cleaning devices |
| REASON: ACTIONS: | Pulley lagging worn Replace the pulley lagging |
| REASON: ACTIONS: | Counterweight too light Add counterweight or increase the screw take-up tension to value determined from calculations |
| REASON: ACTIONS: | Material spillage and buildup Improve loading and transfer conditions |
| REASON: ACTIONS | Sticking idlers Free idlers and improve |
8. PROBLEM: Excessive belt stretch
| REASON: ACTIONS: | Improper belt installation, causing excessive belt Pull belt through the counterweight with tension equal to at least the empty running tension; break belt in with mechanical fasteners |
| REASON: ACTIONS: | Improper initial positioning of the counterweight in its carriage, causing apparent excessive belt Check the Goodyear Engineered Products’ “Handbook of Belting” for the recommended initial position |
| REASON: ACTIONS: | Insufficient counterweight travel Consult Goodyear Engineered Products’ “Conveyor and Elevator Belt Selection Manual” for recommended minimum distances; consult the Goodyear Engineered Products’ Belt Engineer |
| REASON: ACTIONS: | Tension too high Increase belt speed at same tonnage; reduce tonnage, maintain same belt speed; reduce friction with better maintenance and replacement of damaged idlers; decrease tension by increasing arc of contact or go to lagged pulley; reduce the counterweight to minimum amount |
| REASON: ACTIONS: | Counterweight too heavy Lighten counterweight to the value required by calculations |
| REASON: ACTIONS: | System under belted Recalculate belt tensions and select proper belt |
10. PROBLEM: Excessive top cover wear, uniform around the belt
| REASON: ACTIONS: | Dirty, stuck, or misaligned return rolls Remove accumulation; install cleaning devices; use self-cleaning return rolls; improve maintenance and lubrication |
| REASON: ACTIONS: | Cover quality too low Replace with a belt of heavier-cover gauge or higher-quality rubber |
| REASON: ACTIONS: | Material spillage or buildup Improve loading and transfer conditions; install cleaning devices; improve maintenance |
| REASON: ACTIONS: | Off-center loading or poor loading Adjust the chute to place the load on the center of the belt; discharge material in the direction of belt travel at or near the belt speed |
| REASON: ACTIONS: | Excessive sag between idlers causing the load to work and shuffle on the belt as it passes over idlers Increase tension if unnecessarily low; reduce idler spacing |
12. PROBLEM: Longitudinal grooving or cracking of bottom cover
| REASON: ACTIONS: | Sticking idlers Free idlers and improve maintenance and lubrication |
| REASON: ACTIONS: | Slippage on the drive pulley Increase tension through screw take-up or add counterweight; lag the drive pulley; increase arc of contact |
| REASON: ACTIONS: | Material spillage and buildup Improve loading and transfer conditions; install cleaning devices; improve maintenance |
| REASON: ACTIONS: | Pulley lagging worn Replace pulley laggingey |
| REASON: ACTIONS: | Bolts heads protruding above lagging Tighten bolts; replace lagging; use vulcanized on lagging |
| REASON: ACTIONS: | Excessive forward tilt of trough rolls Reduce forward tilt of idlers no more than 2 degrees from vertical |
14. PROBLEM: Covers swells in spots or streaks
| REASON: ACTIONS: | Spilled oil or grease; over-lubrication of idlers Improve house keeping; reduce quantity of grease used; check grease seals |
16. PROBLEM: Vulcanized splice separation
| REASON: ACTIONS: | Belt improperly spliced Re-splice using proper method as recommended by Goodyear Engineered Products |
| REASON: ACTIONS: | Pulleys too small Use larger-diameter pulleys |
| REASON: ACTIONS: | Tension too high Increase belt speed, same tonnage; reduce tonnage, maintain same belt speed; reduce friction with better maintenance and replacement of damaged idlers; decrease tension by increasing arc of contact or go to lagged pulley; reduce the counterweight to minimum amount |
| REASON: ACTIONS: | Material trapped between belt and pulley Install plows or scrapers on return run ahead of the tail pulley |
| REASON: ACTIONS: | Improper transition between troughed belt and terminal pulleys Adjust transition in accordance with Goodyear Engineered Products recommendations |
18. PROBLEM: Transverse breaks at belt edge
| REASON: ACTIONS: | Belt edges folding up on structure Install limit switches; provide more clearance |
| REASON: ACTIONS: | Improper transition between troughed belt and terminal pulleys Adjust transitions in accordance with Goodyear Engineered Products’ Handbook |
| REASON: ACTIONS: | Severe convex (hump) vertical curve Decrease idler spacing in vertical curve; increase curve radius; consult Goodyear Engineered Products for assistance |
20. PROBLEM: Ply separation
| REASON: ACTIONS: | Insufficient transverse stiffness Replace with the proper belt |
| REASON: ACTIONS: | Pulleys too small Use larger-diameter pulleys |
| REASON: ACTIONS: | Heat or chemical damage Use the belt designed for specific condition |
22. PROBLEM: Cover blisters or sandblisters
| REASON: ACTIONS: | Cover cuts or very small cover punctures allow fines to work under the cover and propagate between the cover and carcass Make a vulcanized spot repair or a self-curing repair |
| REASON: ACTIONS: | Spilled oil or grease, over lubrication of idlers improve housekeeping reduce quantity of grease used; check grease seals Decrease idler spacing in curve; increase curve radius |
