30 / 48
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 Continental ContiTech Handbook of Belting for the recommended initial position
Cause:
Insufficient counterweight travel
Solutions:
Consult Continental ContiTech Heavyweight Conveyor Belt Guide for recommended minimum distances;
consult our Belt Engineers
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
27
Installation, Maintenance & Troubleshooting Guide
Troubleshooting