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Industrial Gear Lubricant Viscosity Selection 2 The AGMA 9005-E02 standard shows suggested viscosity grades for industrial gear drives operating under normal loads over a range of speeds and ambient temperatures.

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Many OEMs offer PDF files of the lubrication recommendations for the different types of gear drives they manufacture.Īnother good source for determining the appropriate viscosity for a particular type of industrial gear drive is the AGMA 9005-E02 “Industrial Gear Lubrication” standard (formerly AGMA-D94). One of the easiest and perhaps the most overlooked ways is to go directly to the OEM’s Web site. There are many ways to determine what viscosity grade should be used for a particular industrial gear drive application.

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If the OEM does not specify a particular viscosity grade to use or the lubrication recommendations are no longer available due to lost maintenance records, misplaced operator’s manuals or painted-over nameplates, the correct viscosity grade for a particular industrial gear lubricant can still be determined. The ways these different viscosity grades can be specified by an industrial gear drive OEM are summarized in Table 2.

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An original equipment manufacturer (OEM) will usually specify the industrial gear lubricant’s required viscosity grade in centistokes (cSt) at 40☌ (104☏), in Saybolt Universal Seconds (SUS) at 100☏ (38☌) or reference the required AGMA or ISO viscosity grade. The optimum selection will take into consideration ambient temperatures, the operating temperatures, drive loads and operating speeds that are most desirable in keeping wear rates at a minimum.Īs mentioned previously, the manufacturer of the industrial gear drive generally will specify the viscosity grade to use based upon the ambient temperatures and operating conditions. The use of too heavy of a viscosity can result in excessive heat generated, excessive power losses, decreased gearbox efficiency and improper oil flow. However, care must be taken in selecting the proper viscosity for an industrial gear application. The higher the viscosity, the higher the load-carrying contribution to the industrial gear lubricant. In addition, the viscosity of the industrial gear lubricant selected is important to the overall load-carrying ability of the gear lubricant.

It also allows for the proper flow of the lubricant to carry frictional heat away from the stress points along with any wear debris or contaminants present. Viscosity provides the proper thickness of the oil film at the operating temperature and conditions to keep the mating surfaces of the gears and bearings apart during hydrodynamic lubrication conditions. Viscosity is the most important property of any lubricating oil. This balance can be achieved only through proper viscosity selection. The specifications are also designed to balance the lubrication needs of the gears, which usually require the use of a medium- to high-viscosity lubricant. These lubrication specifications are designed to balance the lubrication needs of the bearings, which generally require a light-viscosity lubricant. These lubrication specifications can be found inscribed either on the industrial gear drive’s nameplate or in the published specifications found in the operator’s manual. In addition to considering these factors, the gear lubricant selected for a particular application should match the recommendations of the original equipment manufacturer (OEM). There are many factors to consider when selecting an industrial gear lubricant for a particular application. Selecting the proper industrial gear lubricant is important to the long-term efficient operation of the gear drive.

Gear oil weight chart