Incorrectly installed topping line on a grapple yarder can lead to failure

Safety Alert Type: 
Heavy Equipment
Salmon Inlet (Sunshine Coast)
Date of Incident / Close Call: 
Company Name: 
Sladey Timber Ltd.
Details of Incident / Close Call: 

Shortly after receiving a 6280 Cypress grapple yarder back from a machine shop where an extensive rebuild was done, it was discovered that the topping line was not installed correctly where it tailholds to the upper gantry and holds the boom up.

The operator was quick to notice this as they had very much the same scenario occur when the machine was first purchased from another contractor. They had also installed the tailhold of a new topping line on the same machine incorrectly and it did result in the topping line breaking and the boom freefalling to the ground.

Thankfully no-one was injured as a result of the incident; however, there was significant damage to the machine. This past Incident Prevention Report (IPR) is included (see attached pdf) for your viewing, as it was due to following the first recommendation in the IPR that may have prevented an almost identical occurrence happening again.

Learnings and Suggestions: 

Any company that purchases a used grapple yarder should ensure this key component is inspected prior to yarding logs with the machine. If it is not right – then fix it prior to any yarding of logs. There are usually diagrams included in the operator’s manual for the proper method(s) of installation and it varies on different machines. This alert should be reviewed by grapple yarding crews and anyone involved in installing topping lines.

For more information on this submitted alert: 

For more information: Doug Sladey (604) 883-2435  dsladey@telus.net


File attachments
Incorrectly installed topping line on a grapple yarder can lead to failure.pdf
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