Page 29 - ConveyorBeltMaintenanceManual2010

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PROBLEM: Belt slip on starting
CAUSE:
Insufficient traction between the belt and pulley:
SOLUTIONS:
Lag the drive pulley; increase the belt wrap; install belt-cleaning devices
CAUSE:
Counterweight too light
SOLUTIONS:
Add counterweight or increase the screw take-up tension to value determined from calculations
CAUSE:
Pulley lagging worn
SOLUTIONS:
Replace the pulley lagging
PROBLEM: Excessive belt stretch
CAUSE:
Improper belt installation, causing excessive belt stretch
SOLUTIONS:
Pull belt through the counterweight with tension equal to at least the empty running tension; break belt in
with mechanical fasteners
CAUSE:
Improper initial positioning of the counterweight in its carriage, causing apparent excessive belt stretch
SOLUTIONS:
Check the Goodyear Engineered Products’ “Handbook of Belting” for the recommended initial position
CAUSE:
Insufficient counterweight travel
SOLUTIONS:
Consult Goodyear Engineered Products’ “Conveyor and Elevator Belt Selection Manual” for recommended
minimum distances; consult the Goodyear Engineered Products’ Belt Engineer
CAUSE:
Tension too high
SOLUTIONS:
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
CAUSE:
Counterweight too heavy
SOLUTIONS:
Lighten counterweight to the value required by calculations
CAUSE:
System under belted
SOLUTIONS:
Recalculate belt tensions and select proper belt
PROBLEM: Grooving, gouging or stripping of the top cover
CAUSE:
Skirt boards improperly adjusted or wrong material
SOLUTIONS:
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
CAUSE:
Belt spanking down under load impact
SOLUTIONS:
Install cushion idlers
CAUSE:
Material hanging up in or under the chute
SOLUTIONS:
Improve loading to reduce spillage; install baffles; widen chute
CAUSE:
Impact of material on the belt
SOLUTIONS:
Reduce impact by improving the chute design; install impact idlers
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INSTALLATION, MAINTENANCE & TROUBLESHOOTING GUIDE
T R O U B L E S H O O T I N G