Broken bolts cause load of logs to shift, tipping truck onto its side

Safety Alert Type: 
Log Hauling
Location: 
North of Campbell River, BC
Date of Incident / Close Call: 
2012-08-07
Company Name: 
Western Forest Products Inc.
Details of Incident / Close Call: 

While negotiating a turn, a loaded logging truck rolled onto its passenger side. Once the scale pad bolts pulled loose and the load spilled, the tractor righted itself and the vehicle came to a stop.

As the truck righted the driver was thrown against the driver’s door, injuring his upper body & head. Initial on-site investigation identified broken bolster bolts on the road approximately 200 meters behind the incident scene. The shearing off of the bolts in combination with the force & direction of travel may have caused the logging truck’s load to shift forcing it onto its side.

Upon investigation of the bolts, it was determined that the threads on the upper portion of the bolt hole were completely worn off. The right side scale pad bolts were cracked 70% through (see photos in attached pdf).

The previous driver had experienced problems with the bolster & scale pad bolts loosening. The issue was dealt with by having a local maintenance shop tighten the bolts.

Learnings and Suggestions: 

Learnings and Suggestions:

  • Daily pre-trips to include checking recognized weak points
  • Change scale pad and bolster bolts annually
  • Replace bolster & scale pad bolts with new ones when scale pad/bolster maintenance takes place
  • When scale pad/bolster bolts are tightened it is recommended that the bolt itself checked for overall condition (integrity/durability), a locking device is in place, they are torqued to the correct torque, and they are then backed all the way out again to check for thread integrity
  • A wash station be made available to allow drivers to visually inspect truck & trailer easily & accurately
  • Review maximum load sizes to ensure compliance with manufacturer’s maximum load ratings for truck and trailer

 

For more information on this submitted alert: 

For more information: Rob Ravai, Contract Supervisor 250-287-5022

File attachments
Broken bolts cause load of logs to shift, tipping truck onto its side.pdf
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