This article under the "Prevention Illustrated" section of Construction Equipment magazine
How to Analyze Oil Analysis
You have the report, but it's what you do with the information that keeps the machines operating
January 1, 2006
By G.C. Skipper, Contributing Editor
It has been said that oil analysis is 85 percent science and 15
percent art. The science part applies to such things as viscosity, the
property in fluid that causes it to resist flow. Laboratory tests
identify the viscosity index number, and that number is a common
measure of changes in viscosity with temperature.
The art lies in the analysis of lab data and the interpretation of what it means.
Oil analysis is like a blood test. A blood test can tell what's
wrong with you before the symptoms occur. Oil analysis can show you
what's wrong with your equipment before the problem shuts it down. Yet
there is one major difference. When the medical lab returns its
results, the report goes to an intermediary — the doctor — who
interprets the data and passes the information along to you.
Not so with oil analysis. Those reports come straight to the fleet manager, and he has to read them for himself.
It is at this point that many managers are overwhelmed by what they
see — an array of codes and numbers, some of which are underlined by
strange markings that look like rows of inverted "Vs."
Even laboratory professionals admit that the uninitiated often find
such reports impossible to read. But understanding the fundamentals for
interpreting laboratory results and recommendations will convert the
task from a confusing chore to a cost-saving management tool that has a
direct impact on the bottom line.
To unravel the knots of reading oil analysis reports, Construction Equipment examined the format used by Polaris Laboratories, which has four basic sections.
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