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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 centred on belt
Readjust idlers in affected area |
REASON:
ACTIONS: |
Structure not level
Level structure in affected area |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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8. PROBLEM: Excessive belt stretch
REASON:
ACTIONS: |
Improper belt installation, causing excessive belt stretch
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 stretch
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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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