Problems:
Belt runs off at tail pulley.
- Cause 1 - Pretention too low
Remedy: Recalculate weight and adjust counterweight.
- Cause 2 - Idlers or pulleys out-of-square
Remedy: Realign, install limit switches for greater safety.
- Cause 3 - Idlers seized
Remedy: Replace or free idlers.
- Cause 4 - Improper loading, spillage
Remedy: Feed should be in direction of belt travel and at belt speed, centered on the belt.
- Cause 5 - Material build-up
Remedy: Remove accumulation. Install cleaning devices, scrapers etc.
Belt runs off at all points of the run
- Cause 1 - Side loading
Remedy: Load in direction of belt travel.Skirts incorrectly placed.Install skirtboards so that they do not rub against belt.
- Cause 2 - Improper loading, spillage
Remedy: Feed should be in direction of belt travel and at belt speed, centered on the belt.
- Cause 3 - Idlers or pulleys out-of-square
Remedy: Realign, install limit switches for greater safety.
- Cause 4 - Material build-up
Remedy: Remove accumulation. Install cleaning devices, scrapers etc.
- Cause 5 - Belt strained on one side
Remedy: Allow enough time for new belt to 'break in'. If belt does not break in properlyor is not new, remove strained section and splice in a new piece.
- Cause 6 - Improperly placed idlers
Remedy: Relocate idlers or insert additional idlers spaced to support belt.
One belt section runs off at all points of the run
- Cause 1 - Belt improperly spliced or wrong fasteners
Remedy: Use correct fasteners. * Retighten after running for a short while.If improperly spliced, remove belt splice and re-splice.
- Cause 2 - Belt bowed
Remedy: A new belt should straighten out when 'broken in' or complete system must be reinspected.
Belt runs off at head pulley
- Cause 1 - Idlers or pulleys out-of-square
Remedy: Realign, install limit switches for greater safety.
- Cause 2 - Pulleys lagging worn
Remedy: Replace worn pulley lagging. Use grooved lagging for wet conditions.Repair loose bolts protruding.
- Cause 3 - Material build-up
Remedy: Remove accumulation. Install cleaning devices, scrapers etc.
- Cause 4 - Improperly placed idlers
Remedy: Relocate idlers or insert additional idlers spaced to support belt.
Belt runs to one side throughout entire length at specific idlers
- Cause 1 - Idlers or pulleys out-of-square
Remedy: Realign, install limit switches for greater safety.
- Cause 2 - Improperly placed idlers
Remedy: Relocate idlers or insert additional idlers spaced to support belt.
- Cause 3 - Material build-up
Remedy: Remove accumulation. Install cleaning devices, scrapers etc.
Belt slips
- Cause 1 - Insufficient traction between belt & pulley
Remedy: Increase wrap with snub pulleys. Lag drive pulley. In wet conditions, use grooved lagging.Install correct cleaning devices on belt and centrifugal switch for safety.Check initial tension.
- Cause 2 - Pretention too low
Remedy: Recalculate weight and adjust counterweight.
- Cause 3 - Material build-up
Remedy: Remove accumulation. Install cleaning devices, scrapers etc.
- Cause 4 - Idlers seized
Remedy: Replace or free idlers.
- Cause 5 - Pulleys lagging worn
Remedy: Replace worn pulley lagging. Use grooved lagging for wet conditions.Repair loose bolts protruding.
Belt slips on starting
- Cause 1 - Insufficient traction between belt & pulley
Remedy: Increase wrap with snub pulleys. Lag drive pulley. In wet conditions, use grooved lagging.Install correct cleaning devices on belt and centrifugal switch for safety.Check initial tension.
- Cause 2 - Pretention too low
Remedy: Recalculate weight and adjust counterweight.
- Cause 3 - Pulleys lagging worn
Remedy: Replace worn pulley lagging. Use grooved lagging for wet conditions.Repair loose bolts protruding.
- Cause 4 - Drive underbelted
Remedy: If centers or loadings are increased, or speed reduced recalculate tensionsand fit the correct Dunlop belt.
Excessive belt stretch
- Cause 1 - Excessive tension
Remedy: Recalculate and adjust tension.
- Cause 2 - Drive underbelted
Remedy: If centers or loadings are increased, or speed reduced recalculate tensionsand fit the correct Dunlop belt.
- Cause 3 - Material build-up
Remedy: Remove accumulation. Install cleaning devices, scrapers etc.
- Cause 4 - Pretension too high
Remedy: Recalculate weight and adjust counterweight accordingly.Reduce take-up tension to point of slip, retighten slightly. If screw take-up,adjust similary.
- Cause 5 - Differential speed wrong on dual pulleys
Remedy: Make necessary adjustment. Observe operation closely.
- Cause 6 - Damage by oil, acid, chemicals, heat
Remedy: Use Dunlop belt designed for specific conditions. Enclose conveyor forprotection against rain, snow or sun.
Belt breaks at or behind splice or fastner
- Cause 1 - Belt improperly spliced or wrong fasteners
Remedy: Use correct fasteners. * Retighten after running for a short while.If improperly spliced, remove belt splice and re-splice.
- Cause 2 - Pulleys too small
Remedy: Use larger-diameter pulleys as specified by Dunlop Conveyor Belting.
- Cause 3 - Excessive tension
Remedy: Recalculate and adjust tension.
- Cause 4 - Pulleys lagging worn
Remedy: Replace worn pulley lagging. Use grooved lagging for wet conditions.Repair loose bolts protruding.
- Cause 5 - Material between belt & pulley
Remedy: Use skitboards properly. Remove accumulation.
- Cause 6 - Drive underbelted
Remedy: If centers or loadings are increased, or speed reduced recalculate tensionsand fit the correct Dunlop belt.
- Cause 7 - Pretension too high
Remedy: Recalculate weight and adjust counterweight accordingly.Reduce take-up tension to point of slip, retighten slightly. If screw take-up,adjust similary.
- Cause 8 - Differential speed wrong on dual pulleys
Remedy: Make necessary adjustment. Observe operation closely.
Vulcanized splice separation
- Cause 1 - Pulleys too small
Remedy: Use larger-diameter pulleys as specified by Dunlop Conveyor Belting.
- Cause 2 - Excessive tension
Remedy: Recalculate and adjust tension.
- Cause 3 - Drive underbelted
Remedy: If centers or loadings are increased, or speed reduced recalculate tensionsand fit the correct Dunlop belt.
- Cause 4 - Material between belt & pulley
Remedy: Use skitboards properly. Remove accumulation.
- Cause 5 - Belt improperly spliced or wrong fasteners
Remedy: Use correct fasteners. * Retighten after running for a short while.If improperly spliced, remove belt splice and re-splice.
- Cause 6 - Differential speed wrong on dual pulleys
Remedy: Make necessary adjustment. Observe operation closely.
Excessive top cover wear, including,rips,gouges
- Cause 1 - Excessive impact of material on belt
Remedy: Use correctly designed chutes and baffles. Install impact idlers. Where possible,load fines first. Where material is trapped under skirts, adjust skirtboards tominimum clearance.
- Cause 2 - Relative loading velocity too high or too low
Remedy: Adjust chutes or correct belt speed. Consider use of impact idlers.Observe operation closely.
- Cause 3 - Improper loading, spillage
Remedy: Feed should be in direction of belt travel and at belt speed, centered on the belt.
- Cause 4 - Material build-up
Remedy: Remove accumulation. Install cleaning devices, scrapers etc.
- Cause 5 - Damage by oil, acid, chemicals, heat
Remedy: Use Dunlop belt designed for specific conditions. Enclose conveyor forprotection against rain, snow or sun.
Excessive bottom cover wear
- Cause 1 - Material build-up
Remedy: Remove accumulation. Install cleaning devices, scrapers etc.
- Cause 2 - Idlers seized
Remedy: Replace or free idlers.
- Cause 3 - Insufficient traction between belt & pulley
Remedy: Increase wrap with snub pulleys. Lag drive pulley. In wet conditions, use grooved lagging.Install correct cleaning devices on belt and centrifugal switch for safety.Check initial tension.
- Cause 4 - Material between belt & pulley
Remedy: Use skitboards properly. Remove accumulation.
- Cause 5 - Pulleys lagging worn
Remedy: Replace worn pulley lagging. Use grooved lagging for wet conditions.Repair loose bolts protruding.
- Cause 6 - Damage by oil, acid, chemicals, heat
Remedy: Use Dunlop belt designed for specific conditions. Enclose conveyor forprotection against rain, snow or sun.
Excessive edge wear
- Cause 1 - Side loading
Remedy: Load in direction of belt travel.Skirts incorrectly placed.Install skirtboards so that they do not rub against belt.
- Cause 2 - Belt strained on one side
Remedy: Allow enough time for new belt to 'break in'. If belt does not break in properlyor is not new, remove strained section and splice in a new piece.
- Cause 3 - Improper loading, spillage
Remedy: Feed should be in direction of belt travel and at belt speed, centered on the belt.
- Cause 4 - Improperly placed idlers
Remedy: Relocate idlers or insert additional idlers spaced to support belt.
- Cause 5 - Belt bowed
Remedy: A new belt should straighten out when 'broken in' or complete system must be reinspected.
- Cause 6 - Material build-up
Remedy: Remove accumulation. Install cleaning devices, scrapers etc.
- Cause 7 - Belt improperly spliced or wrong fasteners
Remedy: Use correct fasteners. * Retighten after running for a short while.If improperly spliced, remove belt splice and re-splice.
Cover swells in spots or streaks
- Cause 1 - Damage by oil, acid, chemicals, heat
Remedy: Use Dunlop belt designed for specific conditions. Enclose conveyor forprotection against rain, snow or sun.
Belt hardens or cracks
- Cause 1 - Damage by oil, acid, chemicals, heat
Remedy: Use Dunlop belt designed for specific conditions. Enclose conveyor forprotection against rain, snow or sun.
- Cause 2 - Pulleys too small
Remedy: Use larger-diameter pulleys as specified by Dunlop Conveyor Belting.
Covers cracked or brittle
- Cause 1 - Damage by oil, acid, chemicals, heat
Remedy: Use Dunlop belt designed for specific conditions. Enclose conveyor forprotection against rain, snow or sun.
Longitudinal grooving of top cover
- Cause 1 - Skirts incorrectly placed
- Cause 2 - Idlers seized
Remedy: Replace or free idlers.
- Cause 3 - Material build-up
Remedy: Remove accumulation. Install cleaning devices, scrapers etc.
- Cause 4 - Excessive impact of material on belt
Remedy: Use correctly designed chutes and baffles. Install impact idlers. Where possible,load fines first. Where material is trapped under skirts, adjust skirtboards tominimum clearance.
Longitudinal grooving of bottom cover
- Cause 1 - Idlers seized
Remedy: Replace or free idlers.
- Cause 2 - Material build-up
Remedy: Remove accumulation. Install cleaning devices, scrapers etc.
- Cause 3 - Critical transition distance or convex curve
Remedy: Increase transition distance or increase radius of convex curve.
- Cause 4 - Pulleys lagging worn
Remedy: Replace worn pulley lagging. Use grooved lagging for wet conditions.Repair loose bolts protruding.
Damage at points of troughing
- Cause 1 - Critical transition distance or convex curve
Remedy: Increase transition distance or increase radius of convex curve.
- Cause 2 - Excessive idler gaps
Remedy: Idler gaps should not exceed 10 mm even when belt is fully loaded. Refit as necessary.
- Cause 3 - Sharp brow points
Remedy: Regrade if possible: increase number of idler sets. Eliminate lead idlers at the brows.