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In This Issue
| - Experimenting with Grease Quantity
- Know When to Change Filters
- Which Thickener has Poor Water Resistance?
- Oil Analysis for Early Fault Detection
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| Experimenting with Grease Quantity |
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When running grease-packed bearings at higher speeds (in excess of 5,000 rpm), experiment with the quantity of grease in the bearing. A 10-percent change in the quantity of grease can drastically affect the amount of heat generated by the bearing (even as much as 40 degrees F, depending on how close to optimum you are). If there is too much grease for the bearing to push out to surrounding pockets, the bearing will heat up quickly. Often the optimum amount of grease is less than what you might think. Be sure to provide a sufficient run-in period for the bearing to position the grease before exposing it to full-time duty. (Jason Moe, Woodward Governor Co.)
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| Complimentary Oil Analysis Handbook
Request the 4th edition of The Practical Guide to Oil Analysis from TESTOIL. This easy to understand guide is a must read for any maintenance professional. A $19.95 value.
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Instead of just watching the filter blockage indicator, consider monitoring the differential pressure, as experience gained with particle counting will show what pressure is the optimum change point. Also, keep in mind that a rupture in the filter media will not be indicated by an increase in pressure drop. If a cleanliness target is set, and this is regularly monitored by a particle counting program, then change the filter when the cleanliness target is exceeded.
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FULL STORY
Test your knowledge and prepare for ICML lubrication and oil analysis certification.
Question: What common grease thickener does not provide good water resistance?
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From "Facility Manager's Maintenance Handbook":
While vibration monitoring is certainly the most widely used tool for determining rotating machinery condition, oil analysis will, in many situations, provide an earlier indication that abnormal or premature wear is in progress. Oil monitoring and analysis is especially appropriate for slow-speed machines, reciprocating machines and gearboxes, as they usually show developing faults earlier using oil versus vibration analysis. As internal machine components wear, they leave the wear particles in the lubricating oil. Identifying the existence, size, shape and elements of the wear particles leads to identifying the particular component experiencing the wear.
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Read more about "Facility Manager's Maintenance Handbook"
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