Log loader mechanical failure on boom and stick hinge point

Safety Alert Type: 
Yarding and Loading
Adams Lake Woodlands (Chase, BC)
Date of Incident / Close Call: 
Company Name: 
Details of Incident / Close Call: 

A log loader was swinging a grapple of long logs onto a truck trailer and a mechanical failure in the boom hinge occurred resulting in the load of logs dropping.

The steel pipe on the stick side of the boom/stick hinge-point broke away. After the break, the boom and stick assembly were supported by the cylinder and hoses. A post-incident inspection found that only half the pipe was welded --- there was not a continuous weld all the way around.

During regular greasing of the hinge point, this location is greased remotely near the grapple end as there is no practical method to regularly service or inspect this location.

The truck driver was in the clear and not at risk of being struck by a log.

Learnings and Suggestions: 
  • Always stay in the clear around active equipment and overhead hazards.
  • At regular intervals, a qualified person should thoroughly inspect and test machine components and welds that regularly receive heavy loads.
  • Operators using a 2015 Tigercat 875 log loader should inspect the hinge for weld defects.


For more information on this submitted alert: 

Evan Hauk, Area Supervisor  Evan.Hauk@Interfor.com

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