Excessive belt stretch

1. Improper belt installation causing apparent excessive belt stretch:

Pulley belt through counterweight with a tension equal to at least empty running tension; Run belt in with mechanical fasteners.

2.Improper initial positioning of counterweight in its carriage causing apparent excessive belt stretch:

Consult ContiTech (Shandong) R&D department for recommended initial position DIN22101 section 10.3 recommended the ratio be ≤3.

3.Insufficient counterweight travel:

Consult ContiTech( Shandong) R&D department for recommended minimum distances.

4.Tension too high:

Increase speed, same tonnage; Reduce tonnage, same speed; Reduce friction with better maintenance and replacement of damaged idlers; Decrease tension by increasing arc of contactor go to lagged pulley; Reduce CWT to minimum amount.

5.Counterweight too heavy:

Lighten counterweight to value required by calculations.

6.System underbelted:

Recalculate belt tensions and select proper belt.