Citation Details

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Section: 56.14100c
Date: 12/05/2013
District: SE
Negligence: Moderate
Injury or Illness: Unlikely
Injury or illness could be expected to be: Lost Workdays or Restricted Only
Significant and Substantial: No

Condition or Practice: The rock knocker on the right rear side of the Caterpillar 769C haul truck co. # 8030 was missing. The knocker is designed to prevent rocks from becoming lodged between two tandem tires. Rocks lodged between two tires can cause friction resulting in tire damage and sudden tire failure. Sudden tire failures can result in serious injuries to the driver of the haul truck.

The operator removed the truck from service until the missing rock knocker can be installed.

Action to Terminate: This action terminates the citation for the missing rock knocker and also corrects the "served to" from James Jenkins to Floyd Drake, Plant Manager. The missing rock knocker was replaced on the haul truck.

Why this concerns you: We have never been cited for rock knockers (actually named rock ejector) as a safety defect, and we, though it is a good idea to have these available to reduce wear and tear to the tires, do not believe this is a hazard or a violation of the MSHA standards. We are also aware that other inspectors from other field offices, as well as other operators, have not considered this as a safety defect and have not cited, or been cited, for this condition.

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