Manutenção centrada na confiabilidade (MCC) aplicada ao sistema hidráulico de uma escavadeira do tipo Backhoe

Abstract

The mining sector has the highest cost with maintenance related activities. Within the production cycle of ore and sterile handling, the excavator is the main equipment and if it has low reliability, it strongly impacts the cost. To optimize equipment performance by reducing the number of unscheduled corrective maintenance and downtime, one must understand how it fails, what it fails and how often it can raise resources in a targeted manner. Thus, the application of the Reliability Centered Maintenance (MCC) method- ology aims to survey equipment history, define a critical system, and perform a failure, failure rate and reliability analysis to output an action plan (interventions, inspections, resources) focused on reducing unscheduled activities, making maintenance more assertive and prepared. In this study, the methodology was applied to the Hitachi EX5500 550-ton excavator hydraulic system operating in the interior of Goiás. In this system, the most costly failures were found in the hydraulic hoses, hydraulic radiator and pumps for which preventive actions were proposed according to with the application of MCC.