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How to Remove Debris Before Installing Hydraulic Hose

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  November 10, 2010 BUYERS GUIDE  |  VIDEOS  |  WHITE PAPERS  |  BOOK STORE  |  EVENTS  
 
In This Issue
  • Advice on Prepping Hydraulic Fluid Hose Before Installation
  • What Causes Oil to Darken?
  • Are You Using the Wrong Oil? Here’s How to Find Out
  • Monitoring Lube Condition with Rate-of-change Alarms
Advice on Prepping Hydraulic Fluid Hose Before Installation
When you make a new hydraulic hose cut from a roll of bulk hose, install the new fittings and then flush the hose with a light-weight oil in order to wash all of the shavings out of the hose. Otherwise, you will introduce rubber and metal braid shavings into the hydraulic system. Make sure the flushing oil is compatible with the hydraulic fluid used and that the velocity of the flush is about twice that produced by the system’s hydraulic pump. Another way to clean hydraulic hoses is to use pneumatic projectiles (sponges) that push through the hose to clean out debris.

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What Causes Oil to Darken?

Test your knowledge and prepare for ICML lubrication and oil analysis certification.

   Question: What causes darkening of oil in non-engine applications?

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Are You Using the Wrong Oil? Here’s How to Find Out
How do you know if the right lubricants are being used in your machinery? A lubricant specification survey, often called a lube chart, may have been performed, individual machine maintenance manuals may be used or you may use whatever lubricant has always been used. Regardless of the method used, assuming the original specification is correct, you might be surprised to find out what lubricant or lubricants are actually installed.
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Monitoring Lube Condition with Rate-of-change Alarms

From the book “Oil Analysis Basics – Second Edition” by Jim Fitch and Drew Troyer:

Rate-of-change alarms are typically set to measure properties that are being progressively introduced into the oil, such as wear debris. The add rate (change) can be calculated per unit of time, hours, cycles, etc. For example, an increase in iron of 100 parts per million over a period of 100 operating hours could be stated as one ppm per hour of operation. When the parameter is plotted against time, the rate of change (add rate) equals the current slope of the curve. Unlike level limits, rate-of-change limits ignore the absolute value of the data parameter, emphasizing instead the speed at which the level is changing. Rate-of-change limits are effectively applied to particle counting (unfiltered systems), elemental wear metals, ferrous density, AN and RPVOT. It also can be effectively applied to monitor abnormal degradation of additives with elemental, LSV and FTIR spectroscopy.

Read more about "Oil Analysis Basics – Second Edition"


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Fundamentals of Machinery Lubrication
February 8-10 - Atlanta, GA

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