Continued from page 27 Summary
Hydraulic equipment engines can be up to a 100x more powerful than when they were introduced more than 60 years ago. Lubricant formulations have not kept pace with the changes in performance demands. The majority of operating failures are attributed to lubricant inadequacies.
Air Release All oils absorb air. Air entrainment is the dispersion of tiny air bubbles throughout the bulk fluid. This is very problematic for hydraulic systems — systems that depend on the oil being incompressible in order to properly transmit power. Additionally, dissolved air can cause pump cavitation, excess wear and erratic movement of machine parts. The ability of oil to separate entrained air is critical. Group II base oils release air twice as fast as Group I.
Automotive engine oils drive formulators’ base oil purchasing decisions. Tightening specifications are moving many blenders to a Group II/III supply strategy. The performance characteristics of Group II base oils that enable a lubricant to meet tightening AEO specifications also enable formulating hydraulic oils that meet the performance requirements of modern equipment. Hydraulic equipment OEMs, such as Bosch Rexroth, are establishing lubricant specifications that are intended to better protect equipment and extend oil life. As awareness grows of the benefit of Group II based hydraulic oils we can expect to see specifications tighten more quickly and the role of performance testing expand.
Reference: 1
Thomas Ruhle, Thomas Rossrucker, Georg Hering, Steffen Sandhoffer and Michael Konig, Rhein Chemie Rheinau GmbH, Division Lubricants and Oil Additives, “Comparison of Zinc-Containing and Zinc-Free Hydraulic Packages Using Severe Laboratory Performance Tests” Presented at World Tribology Congress 2009.
LINK
www.chevronbaseoils.com
The main causes of the equipment failures are hydraulic fluid and how the fluid is managed. Source: Bosch Rexroth
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LUBE MAGAZINE NO.145 JUNE 2018
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