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Section: 56.14101a2
Date: 05/22/2013
Negligence: Low
Injury or Illness: Unlikely
Injury or illness could be expected to be: Fatal
Significant and Substantial: No

Condition or Practice: When tested, the parking brake on the Caterpillar D440 Haul Truck (S/N
8PS00647) was not capable of holding the equipment with its typical load on
the maximum grade the haul truck travels. The haul truck was observed hauling
reject sand at the time of the inspection. The parking brake was tested with
a typical load on the exit hill where the truck was being loaded throughout
the shift. Should the vehicle roll unexpectedly with a defective parking
brake, a miner would be subjected to severe injuries from being struck by the

Action to Terminate: We hired Michigan Cat to inspect the brakes fearing that they were wore out. They were in great condition, the technician explained to us that on this style of truck when the parking brake is applied while the unit is running it only engages the front axle, when it is shut off there is a drive line lock that engages all of the axles. The units wouldn't pass the standard perfectly while the unit was running so we installed a toggle switch that could be used to engage the rear two axles so that the unit could pass the standard.

Why this concerns you: The equipment was in good working condition, but by design it wouldn't pass the standard as it was never designed to be parked on a grade loaded. The service brakes worked great on the grade so it wasn't a question of whether it was too steep of a grade. It concerns me when we start to have to modify equpiment beyond manufacturers standards to meet MSHA standards. At what point are we jepordizing the integrity of the equipment? And across the board this isn't a cost effective way to do busineses, buy a piece of equipment designed to do the function that you are asking it to do and then modify it to meet MSHA standards. That concerns me greatly.

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