Do preventive maintenance (PM) procedures work?
Look at total employee hours, grouped by work type or class, comparing the amount of emergency or breakdown repairs to the amount of PM work accomplished. This analysis should show a decline in emergency or breakdown repairs if technicians perform the correct PM tasks at the correct frequency. Are PM inspection frequencies accurate? Look at the number of scheduled work orders grouped by work type or class, analyzing the amount of work identified through PM inspections. This ratio should be approximately one to six. In other words, performing a PM task six times should generate at least one corrective work order. Where are the reliability problems? And where should maintenance technicians focus limited resources? Look at the total cost for work type or class emergency/breakdown and call-in repairs. Then sort work requests by equipment or equipment type or class, looking at both open and closed work orders. This process will identify, by equipment number or class, where costs accumulate.
