Trip Cable Bell: update to a previous hazard alert posted on March 3, 2015

Safety Alert Type: 
Log Hauling
Throughout British Columbia
Date of Incident / Close Call: 
Company Name: 
Details of Incident / Close Call: 

This memo serves as a clarification to the Hazard Alert Bulletin Dated March 3, 2015.

Interfor’s safety consultants "First Choice Truck Safety and Consulting" have concluded a thorough investigation into the failures of “D" rings (Tripping Bells). The following information has been compiled for the drivers and owners of all log haulers contracted to Interfor.


  • “IF LESS THAN 10%” of the cross-sectional areas of the Tripping Bell has been lost due to a significant gouge or nick, then it must be repaired by rounding out with a die grinder to further avoid cracking
  • “IF MORE THAN 10%” of the cross sectional areas of the Tripping Bell has been lost due to a significant gouge or nick, then the Tripping Bell must be replaced as it has become “UNUSABLE".
  • “THE CURRENT PRACTICE” when changing out a defective cable by beating the end of the Tripping Bell is NOT acceptable unless the Tripping Bell is going to be discarded as well.


Learnings and Suggestions: 
  • Driver Daily Inspection of each tripping bell at beginning of their shift and every time after the tripping system is used.
  • Installation of a "cable guide" on bunk base to control the cable movement, while under pressure during unloading. This will limit damage to the bell from hitting other metal components and causing nicks or gouges.
  • When a bell is found with less than the 10% loss factor, the process of grinding out a nick or gouge is recommended and allowed, however this process should be completed by a certified welder.
  • When changing out a defective cable and utilizing the existing acceptable tripping bell, the cable should be cut off, and the tripping bell placed between two pieces of wood secured into a vise. The free end of the cable must be hammered towards the bell. During this process the bell must not be struck by the hammer, unless the hammer is of a composite cast, standard head, soft- faced hammer.
  • At no time during the use of the tripping system or replacing a cable, is the tripping bell to be hit to cause the mushrooming effect that was commonly found during the inspections.
  • In addition, if any bell has a crack, has 10% or greater loss factor, or the throat portion has been increased by 15 % of the original opening measurement, then it is deemed “UNUSABLE”.


For more information on this submitted alert: 

Lana Kurz, RPF Interfor Woodlands Safety and Environment Forester, Interior Operations lana.kurz@interfor.com 

File attachments
HAZARD Alert Tripping Bell May 25 2015.pdf
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