Correct selection of lubricant is a cornerstone of an excellent lubrication program.Ī good understanding of this enables the lubrication technician to maximize the reliability of the machine under normal conditions and to use the lubricant specification as a problem solver under abnormal conditions. There are numerous factors to consider when selecting industrial gear lubricants beyond simply selecting a product from the maintenance manual’s QPL, including product availability, operating conditions, preferred brand of lubricant, and product consolidation efforts. In addition to understanding and interpreting the device manufacturer’s specifications, it is important to understand why and be able to make changes if necessary. It is therefore important that those responsible for selecting lubricants have a basic understanding of how lubricants are specified for the gearbox. While some original equipment manufacturers (OEMs) provide general specifications that take into account relevant parameters, others only provide a general specification that may not even take operating temperatures into account. Unfortunately, this solution may not always provide optimal lubrication for a given gear set or maximum efficiency in managing lubricant inventory. It’s usually as simple as searching a service manual and selecting a product from the QPL (Qualified Product List). How do you know which Gear oil is the best fit for a given application? The gear oils of the GL-1 class contain no EP additives and are therefore used in applications that contain parts made of yellow metals. Typical additives include dithiocarbamate derivatives and sulfur-treated organic compounds (“sulfur-containing hydrocarbons”).ĮP additives containing phosphorus/sulfur compounds are corrosive to yellow metals such as copper and/or brass used in bushings and synchronizers. Most gearbox and differential lubricants contain high-pressure additives (EP) and anti-wear additives to deal with the sliding action of hypoid bevel gears. Gear oils make up about 20% of the lubricants market. Some modern automatic transmissions (integrated transmission and differential) do not use heavy oil at all, but instead, lubricate with the lower viscosity hydraulic fluid that is available under pressure in the automatic transmission. It is of high viscosity and usually contains organosulfur compounds. Gear oil is a lubricant made specifically for transmissions, transfer cases, and differentials in automobiles, trucks, and other machinery.
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