 This study examined the effectiveness of two differed policies for replacing critical reputable components in six hydraulic excavators at an open pit mine. One policy relied on the manufacturer's recommended meantime between failure, MTBF, while the other policy relied on meantime between intervention, MTBI. The MTBI policy proved more effective than the MTBF policy, resulting in lower maintenance costs and higher levels of reliability. This article was authored by Milena Karen Vilchis-Torres, Jimmy Francablita's crews, and Wilson Castro's salupu.