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SHELL Tellus S 22 New 20 lit.VTSZ: 27101983Performance Features • Outstanding oil life Typically two to four times that of many anti-wear hydraulic oils. • Peace of mind Through longer component life and outstanding operation. • Lower ecological impact Zinc and chlorine free formulations unique to Shell. Many piston pumps utilise brass components and in particular brass slippers which fit onto the heads of steel pistons and slide on a steel surface. These bronze slippers are usually the items of wear and an oil’s performance is normally evaluated by the weight loss of bronze and the loosening of the fit on the pistons, referred to as ‘slipper fit’. Many anti-wear hydraulic oils permit either considerable wear, if the pumps are highly loaded, or in extreme cases result in pump failure by the slippers detaching themselves from the pistons. Shell Tellus Oils S give extremely low wear rates of the brass components in the Denison P-46 pump; the most severe standard industry test for this performance aspect. FZG gear rig test • Gear rig tests are sometimes used for evaluating hydraulic oils and the best known is the FZG rig (Forschungsstelle für Zahnräder und Getriebebau – Technical Institute for the study of Gears and Drive Mechanisms). The rig utilises a pair of specially designed case-hardened spur gears and, for hydraulic oils, it is run at a pitch line velocity of 8.3 m/s, with an oil temperature of 90°C. The test is carried out by running the gears for 15 minutes in the test oil the weighing the gears, after which the machine is reassembled and the load increased. This procedure is carried out until at least 10mg weight loss is recorded between the stages, or until the gears appear scuffed. Shell Tellus Oil S achieves an 10th Fail stage. Thermal stability • An oil’s thermal stability is the measure of its ability to resist degradation and attack of metals at high temperature. An accelerated test for this is to maintain the oil at a temperature of 135°C for one week in the presence of steel and copper. • Tests with Shell Tellus Oils S show negligible weight changes of the metals, whilst the steel remains bright and there is only slight discolouration of the copper; many anti-wear hydraulic oils cause the copper to become black. Hydrolytic stability • Hydrolytic stability indicates the extent to which an oil tends to develop acidity in the presence of copper and water at high temperatures. The test for hydrolytic stability not only evaluates the acidity developed in the water present, and is also regarded as giving an indication of an oil’s suitability for use with copper alloy parts. It is a stringent test in which many good anti-wear hydraulic oils perform poorly, but in which Shell Tellus Oils S give outstanding results. • In the hydrolytic stability test, oil, water and copper are sealed in a bottle and rotated for 48 hours in an oven at 93°C. At the end of the test, the oil and water layers are separated and the insolubles weighed. The change in weight of the copper is also measured and the oil viscosity and acid numbers of both the oil and the water are determined. • Results of the tests with Shell Tellus Oils S are excellent. They show negligible copper weight loss and very small changes in acid values of oil and water.Shell Tellus Oils S have been tested and approved to exceed the following industry requirements: Denison HF-0 Rexroth Vickers M-2950-S (Mobile systems) I -286-S (Industrial systems) Cincinnati Milacron P68, P69, P70 ISO 11158 |
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