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In This Issue
| - Advice for Gearbox Oil Changes
- Removing Dissolved Contaminants from Oil
- What a Rapid Increase in AN Indicates
- Effect of Reservoir Volume on Oil Analysis
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| Advice for Gearbox Oil Changes |
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| When changing oil in a gearbox, I put an air wand (from shop air or portable air source) down into the vent plug. This blows oil residue and deposits off the surface of the gear teeth and casing. It also pushes sediment off the case bottom. I usually hold up a shield to keep the splatter down. Afterward, I like to flush the box with a lower viscosity oil of the same type for a few minutes and then drain again using the air wand. In the past, I used to just drain and fill, but now with this method the oil in the sight glass looks like a new gearbox, with very little residue. The procedure is faster as well. (Stan W. Strickland, Georgia-Pacific)
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| Complimentary Oil Analysis Handbook
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Varnish-related issues seem to have escalated in the last few years, and many have found that the so-called dissolved soft contaminants are a major part of the problem. Learn how soft contaminants are created, their consequences and how to detect them, as well as a new and improved method of removing them utilizing cooling and cellulose depth filter media.
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FULL STORY
Test your knowledge and prepare for ICML lubrication and oil analysis certification.
Question: A rapid increase in acid number might indicate what?
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An excerpt from "Machinery Oil Analysis":
Two of the most critical maintenance activities that impact oil data are oil makeup and change-out. All fluid and machine failure indicators are "concentration measurements." This means the "value" of the parameter reported is a function of the volume in the reservoir at the time the sample is taken. Allow the volume to “fluctuate” by infrequent large makeup additions and the test data fluctuate inversely, causing interpretation difficulties. Always maintain the reservoirs of operating machinery at the OEM recommended level. If the machine is a heavy oil consumer, add small volumes of makeup oil on a frequent basis. Never wait until the reservoir or sump falls to less than 90 percent full.
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Read more about "Machinery Oil Analysis"
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