Confirm Corrective Actions
Any time maintenance is carried out plan on reviewing the next oil sample report from that equipment.
The follow-up sample report will confirm whether the maintenance action corrected the abnormal or severe condition. For example, a sample on a hydraulic press indicates a dramatic increase in particulate levels. The analyst recommends a check for source of contaminant entry followed by off-line filtration to bring the oil back to acceptable cleanliness levels. Maintenance does a visual check of the system and finds no major leaks or improperly installed filters, and proceeds to filter the oil through a portable oil filter buggy. The follow-up sample shows that the particulate levels are still high despite the maintenance actions taken. Maintenance, reacting on the follow-up sample, re-inspects the press and finds a deteriorated seal, and replaces it. The next oil sample shows that the particulate levels have returned to normal levels.
In addition, the follow-up sample will indicate if another abnormal condition was introduced while correcting the initial problem. For example, a severe sample report necessitates the replacement of a rolling element bearing. The new bearing is misaligned upon installation, and the subsequent oil analysis report indicates an abnormal level of iron and nickel. Additional ferrographic testing reveals cutting wear particles, in the absence of any abrasive contaminant. The analyst deduces and communicates to the maintenance staff that the new bearing is misaligned. Reinstallation and the subsequent oil sample indicates that all wear levels are normal.