This provides more time for the air to escape.ĭue to the resistance, valves and filters struggle to pass high-viscosity hydraulic oil. If your system requires high viscosity oils, you can incorporate varying-sized reservoirs. To identify this problem, check for abnormal sounds such as knocking or banging. When you use thicker oil, it is slower to pump, which increases the chances of cavitation. This may cause lower lubrication, metal erosion, heat, and wear. This is a low-pressure issue when the pressure in the pump is below the oil’s vapour pressure.īubbles and cavities form in the oil. When the hydraulic oils’ viscosity is higher than expected, you may experience cavitation problems. Thus, your equipment performs unpredictably since the pump takes in gulps of air with the oil. When air accumulates in the system, it may cause foaming. Hydraulic oils with more weight release air slowly compared to lighter oils. Air release refers to how hydraulic oil releases enclosed air. High viscosity fluids cause issues such as poor air release. Working with low viscosity hydraulic oil increases the risk of internal leakage in your system. Industrial machinery handling heavy load. This is as depicted in the table below Hydraulic Oil Grade The different viscosity ranges have varying uses. Hydraulic Oil Viscosity Chart 3 Best Lubricants And Oil Company In 2022 - Itr Lubricants 2023įigure showing the hydraulic oil viscosity chart| In application, ISO 150 works well in low temperatures, whereas ISO 220 works better in high temperatures. It’s always important to check with your supplier, as some grades may cross over.įor example, SAE 90 covers ISO 150 to ISO 220. Those that you cross over are equivalents. You can draw a horizontal line from your known viscosity chart across the hydraulic oil viscosity chart|. The chart below gives a reference point to help you convert between the four viscosity measures. Most hydraulic systems apply a viscosity range of ISO VG15-ISO VG100. Viscosity grade gives you a hydraulic oil’s viscosity in centistokes (CST) at 40 0C. However, W, next to automobile engine oil, refers to winter oil. Thus, grades that have W on them refer to the weight. The higher the VG number, the higher the viscosity, also called weight. Static gear boxes mostly match the American Gear Manufacturers Association ( AGMA). The ISO Viscosity Grade (VG) applies if your application is stationary, whereas the SAE grade applies to a mobile application.Ī lot of modern equipment falls into these two grades. International Organization for Standardization (ISO) is the commonly accepted measure for viscosity. To find out which oil and which viscosity you should use for your vehicle, refer to the manufacturer's service manual.How to achieve the optimum hydraulic oil viscosity The numbers to the right of the letter “W” are its hot grade.The higher the grade, the more viscous the oil will be at high temperatures. The lower the viscosity when cold, the more fluid the oil is at low temperatures and the more easily it can be pumped.Greater levels of fluidity at low temperatures make cold starts easier. The viscosity designation is made up of two numbers separated by the letter “W” (for “Winter” for the cold grade).The numbers that come before the W refer to the product’s cold grade, i.e., its viscosity at low temperatures. The SAE (Society of Automotive Engineers) has developed a means of classifying lubricants in order to specify their viscosity levels when hot and when cold. It should remain fluid at low temperatures (to make cold starts easier) and viscous at high temperatures (in order to provide protection and sealing).The grades that have been optimized for each of your oils are detailed in your service manual. To ensure that your vehicle performs optimally, your oil should retain a certain level of viscosity in all weather conditions: Viscosity varies according to temperature in the following way: the higher the temperature, the more fluid and less viscous the oil will be. An oil can, in effect, be characterized by its viscosity, its flow resistance or by the thickness of its oil film. Lubricants behave differently at high and low temperatures. Engine Oil Viscosity/ Motor Oil Viscosity
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