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:
For more information: Rob Ravai, Contract Supervisor 250-287-5022
|Broken bolts cause load of logs to shift, tipping truck onto its side.pdf|