With between 70 and 80 per cent of all hydraulic failures caused by contaminated oil, effective analysis is vital to ensuring the healthy functioning of machinery. Bosch Rexroth outlines its top 10 tips for maintaining oil quality.
1. Monitor
Regular monitoring is essential to ensuring oil integrity; as a minimum, oil should be sampled on a quarterly basis.
2. Identify
There are three types of contamination and identifying them correctly will impact treatment:
3. Locate the source
Identifying the source of the contamination will help to prevent or offset further occurrences. These could include built-in contamination as a result of the component manufacturing process, external such as airborne contamination ingress, and contamination generated by the functioning of the machine itself.
4. Neutralise
Neutralising the cause of the contamination could include a thorough oil transfusion, installing additional air filters and replacing worn or damaged components.
5. Benchmark
ISO 4406 is the code that almost all industrial oil analysis reports are based, with the benchmark being determined by the application.
6. Filter
Effective filtration can significantly offset, or in some cases prevent, oil contamination. Identifying flow rates, viscosity and pressure are all essential to specifying the right filtration system.
7. Analyse
Effective oil analysis requires in-depth inspection. This could be in a laboratory environment through microscopic particle count and gravimetric test, or through a mobile particle counter installed on the machine.
8. Predict
Recording and plotting results will enable maintenance engineers to identify trends and predict future risks. This is essential for minimising, and in some cases eradicating, unplanned machinery downtime.
9. Prevent
There are a number of simple steps that can be taken that can help prevent contamination:
10. Invest
Oil analysis does come with a small cost of approximately 15 per machine. However, when you consider that the cost of replacing an average sized pump can be anywhere been 3000 and 5000 and that a typical hydraulic system can feature five or more pumps all fed from the same oil reservoir, the financial argument really starts to stack up.
To find out more about oil analysis from Bosch Rexroth visit www.boschrexroth.co.uk.