Corrective Maintenance...Opportunity for Practical Root Cause Problem Elimination (RCPE)
Imagine you work in a mill as a mechanic and get a work order that states: Replace bearings on a press roll due to high vibration level. You complete the work and the bearings and seals were replaced according to the plan. The machine was started up and is now producing paper again.
Here are pictures of the bearings:
Let's use this is an opportunity to do an informal Root Cause Problem Elimination (RCPE). What do you see? Let's say you don't have a lot of experience with bearings in this application. We know that this area is frequently washed down to remove pulp. Here are some clues:
- Corrosion due to water in the oil
- Correct seals for the application
- Correct seal material- what chemicals are used for cleaning
- Bearing fit of the shaft
- Mounting procedure for bearings
You have now identified some possible causes so it is time to verify what caused the failure. Let's check them off one at a time to get down to the Root Cause. Every corrective work order is a RCPE on a smaller scale. Of course, if this is a major problem it should trigger a formal RCPE.