2009-10-06 Steering cylinder fails

Safety Alert Type: 
Log Hauling
Western Forest Products Holberg Operations
Date of Incident / Close Call: 
Company Name: 
Western Forest Products
Details of Incident / Close Call: 

An off-highway log truck was driving out empty to the log loader. The truck was in 5th gear on a straight stretch of road with good visibility.

Without warning the truck veered and the driver lost control as it went hard right, into the ditch. The Truck Driver was not injured.

After pulling the truck out of the ditch; the steering cylinder was replaced. Steering was tested and found to be fully functional. After further inspection of the original steering cylinder, it was discovered that a nylock nut came off the end of the control valve spool in the steering ram. As a result, full pressure from the steering cylinder was applied causing the severe pull to the right.

It was determined that when the cylinder was rebuilt, a nylock nut (without a cotter pin) was used instead of the standard practice of a nut and a cotter pin as a failsafe.

Learnings and Suggestions: 

Check internal records prior to November 2008 to identify if any Vickers steering cylinders had been supplied by Inland Kenworth and re-built by Cancraft Steering. If so, ensure the cylinders have cotter pins after the nuts.

Inspect Off-Highway Log Truck steering components to ensure there is no excess play in the steering.

Inform distributer if any deficiencies have been identified.

Discuss incident with drivers and reinforce the importance of reporting any steering deficiencies.

For more information on this submitted alert: 

Ernie Springer - HFO Master Mechanic - 250-288-3441

Vince Devlin – EHS Advisor – 250-230-2173

Disclaimer: This Hazard Alert has been produced in the interests of injury prevention. The BCFSC accepts no responsibility for the accuracy of the contents of this Hazard Alert or any advice contained in it. Implementing any suggested actions from this Safety Alert is entirely a matter for recipients, in light of their own safety management system and related work procedures.


File attachments
2009-10-01 Steering cylinder fails.pdf
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