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Hitachi dump truck

Situation

An underground copper mine in Western Australia uses Hitachi AH400D trucks in rigorous service to haul ore from the mine to the mill. These vehicles utilize a transfer case gearbox to transfer power from the transmission to the rear and middle differentials. Drop-box bearing and gear failure were often encountered by 2,500 hours, resulting in frequent component rebuilds. The typical cost associated for replacement or rebuilt drop boxes is between US $35,000 to US $50,000 per unit. The drop-box maintenance costs were a significant issue at the mine.

Recommendation

After evaluating the application and operating environment, the Mobil Lube Engineer recommended Mobil SHC™ 626 high viscosity gear oil, designed to maintain viscosity and oil film thickness in extreme operating conditions. The performance of the equipment and the lubricant were closely monitored through the Mobil Serv℠ Lubricant Analysis program.

Result

Since the implementation of Mobil SHC 626 oil, there has been a significant improvement in the reliability of the fleet of six haul trucks, with an average annual savings of US $250,000 across the fleet. The initial trial truck tripled its drop-box overhaul interval to 7,780 hours. The benefits resulted from extended oil drain intervals and reduced drop-box maintenance. The mine decided to use Mobil SHC 626 gear and bearing oil as initial fill on all Hitachi dump truck drop boxes.

*This success story is based on the experience of a single customer. Actual results can vary depending upon the type of equipment used and its maintenance, operating conditions and environment, and any prior lubricant used.

02-23-2016