Mines safety alert no. 327 | 10 June 2016 | Version 1
A Caterpillar 777F rear dump truck was travelling down a ROM ramp when it lost engine power resulting in the truck wheels locking on and the truck sliding for approximately 60 metres, coming to a halt on the haul road. The emergency steering allowed the operator to retain control of the truck. No injuries to personnel were incurred.
A non-genuine relay, installed for the Automatic Fire Suppression System, had been dislodged and worked loose from its position due to vibration. The relay was installed to control power supply between the fire suppression system control module, engine electronic control module and the 'E Stop' switches.
When the relay dislodged it open circuited the power supply to the engine electronic control module, causing the truck engine to suddenly shutdown without warning.
Investigations are ongoing and further information may be published as it becomes available. The information in this publication is what is known at the time of writing.
We issue Safety Notices to draw attention to the occurrence of a serious incident, raise awareness of risks, and prompt assessment of your existing controls.
The site's six-monthly inspection regime for automatic fire suppression systems did not include an inspection of this particular relay.
The fire suppression system did not discharge during the incident.
Contact: Alan Graham, Inspector of Mines , +61 7 4447 9250 alan.graham@dnrm.qld.gov.au
Issued by Queensland Department of Natural Resources and Mines
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All information on this page (Uncontrolled engine shutdown on a dump truck - https://www.rshq.qld.gov.au/safety-notices/mines/uncontrolled-engine-shutdown-on-a-dump-truck) is correct as of time of printing (Apr 26, 2024 2:32 am).