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Characteristic
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Possible problem
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Solution
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Conveyor running to one side at a given point on structure
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One or more idlers not rectangular to the longitudinal axis of the belt
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Adjust idlers
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Sticking idlers
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Clean idlers and belt, install
belt cleaning
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Conveyor frame or structure not level or crooked
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Level the structure
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Guiding not sufficient
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Tilt idlers and/or install belt guiding
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Particular section of the belt runs to one side at all points
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Belt splicing not straight
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Re-splice the belt.
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Bowed belt
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A new belt should straighten out after operated under full load tension, use self-aligning idlers on the return strand ahead of the tail pulley if necessary
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Loading being placed on the belt off-centre
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Adjust chute and loading conditions to place load in the centre of the belt
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Guiding not sufficient
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Tilt idlers and/or install belt guiding
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Conveyor belt runs to one side at all points
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One or more idlers not rectangular to the longitudinal axis of the belt
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Adjust idlers
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Sticking idlers
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Clean idlers and belt, install belt cleaning
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Sticking or blocking guide idler set
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Maintain the guide idler set movable or replace it
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Rubber cushion discs worn out or loose
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Exchange rubber cushion discs
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Conveyor frame or structure not level or crooked
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Level the structure
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Side loading
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Load in direction of belt travel, in center of conveyor
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Conveyor belt runs to one side for a longer distance
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Missing steering devices on return strand
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Install steering devices, e.g. through-ed roof idlers in angle of 10-15° on the return stand
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Material trapped between belt and tail pulley
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Install V-scrapers; install decking or guards
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Material builds up at the pulley
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Remove accumulation, install scrapers, install decking or guards, improve loading
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Not parallel installed scraper on return strand
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Check the position of the scraper; change worn scraper blades
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Rubber sealing of the chute is not correct installed or not symmetric
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Install sea-lings perpendicular to the belt surface, change worn sea lings
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Loading being placed on the belt off-centre
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Adjust chute and loading conditions to place load in centre of the belt
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Belt running to one side at or close to the pulley
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Pulley is not rectangular and level to the centre line of conveyor
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Level the pulley, install guide idlers or/and limit switches
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Material trapped between belt and tail pulley
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Install V-scrapers; install decking or guards
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Material builds up at the pulley
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Remove accumulation; install scrapers, decking and/or guards and improve loading
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Pretension too low
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Recalculate and increase counterweight or screw take-up
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Belt misalignment, following no pattern of performance
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Belt too stiff to train
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Reduce the troughing angle, tilt troughing idlers forward but not more then 2°
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Belt to flexible in cross direction
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Use belt with higher rating or thicker carcass
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One or more idlers not rectangular to the longitudinal axis of the belt
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Correction of idlers
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Sticking idlers
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Lubricate or exchange idlers, improve maintenance
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General slippage
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Pretension too low
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Recalculate and increase counterweight or screw take-up
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Unsuitable pulley lagging
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Check the condition of the pulley lagging. In wet conditions, use grooved lagging
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Worn pulley lagging
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Change the pulley lagging. Use grooved lagging in wet conditions
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No pulley lagging and dirty pulley
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Install a pulley lagging and correct cleaning devices. Increase the angle of wrap, install pulley scraper
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Overloading
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Decrease the load
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Material build-up
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Remove accumulation, install cleaning devices, scrapers and inverted "V" decking
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Sticking idlers
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Lubricate or exchange idlers, improve maintenance
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Belt edges lift off idlers
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Chemical change of top cover, caused by material
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Choose grade of cover rubber according to material
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Bottom cover too thin or carcass thickness too low
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Install belt with thicker carcass or bottom cover
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Belt tension too high
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Modify conveyor to achieve a reduction of belt tension
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Belt center lifts off centre troughing idler
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Belt to crossrigid
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Install belt with better troughabillity, decrease troughing angle
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Belt center lifts off centre troughing idler in concave curves
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Curve design, belt type and belt tension not well adapted
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Reduce troughing angle in convex curve, increase curve radius, install belt with lower elastic modulus
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