Madill 124 Grapple Yarder Pulled Over By Lines

Date of Incident / Close Call: 
Company Name: 
Western Forest Products
Details of Incident / Close Call: 

After rigging a new tailhold and hanging the guyline, the grapple yarder operator started moving his machine down the road to park it in a turnout for the weekend. While proceeding down the road, the guyline, mainline and haulback lines were all slack. The operator walked the machine approximately 50 feet, when without warning the machine started tilting to the left and then fell over onto the boom.
It was later determined that this incident was caused by the interlock regen lever being engaged and as a result the haulback line picking up, while the machine was traveling down the road. It is unclear on whether the operator bumped the lever, or the vibration from the machine from traveling down the road may have caused the lever to jump into gear.

Upset Conditions:
1. The operator did not disengage the winches when moving the machine so that only the travel function was active as stated in the operating manual.
2. The machine operator and supervisors were not familiar with the operating manual requirements for this machine.

Learnings and Suggestions: 

1. All Timberlands Operations should immediately ensure that supervisors and employees are familiar with the operating manual of machines that they operate and supervise.
2. All Timberlands should update their safe work procedures (JSB) for the Madill 124, to state that winches must be disengaged prior to traveling machine.

File attachments
2007-01-08 Grapple Yarder Pulled over by lines.pdf
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