ENGINE AR-PRIMARY 3767984 - Caterpillar

an attempt to get the truck back to the loading tool as quickly as possible, the portion of the haul road that lies between the "dump/hopper" and the loading tool is sometimes over maintained. However, this may result in less attention to the "traveling loaded" portion of the haul road. This is not good practice. In the previous example, it is clear that all of the damage is done during the "traveling loaded" portion of the haul road. Rough haul roads cause trucks to travel at slower ground speeds. The slower ground speed results in increased cycle times. The increased cycle times results in lost production. Typically, most damage is done to the trucks during the loaded phase of the cycle when the gross weight of the machine is about twice that of the empty weight. In order to correct the problem, the Road Maintenance Team needs to effectively repair the hot spots that are reported by the RAC. RAC makes it easy to determine when more time is required for the support equipment on the "traveling loaded" portion of the haul road. When only one RAC event appears in a given segment of haul road and does not reappear, this suggests the event was likely caused by the operator or the payload was poorly placed in the truck body. These causes are obviously not related directly to the haul road. Furthermore, identifying errors of the operator from the conditions of the haul road ensures that the support equipment is not over maintaining the haul road. RAC data can also be used to help determine the amount of support equipment is required for adequate maintenance of the haul road for a given distance of haul road.