2 lithium ep and molybdenum disulfide ep no 2 these

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Unformatted text preview: m disulfide designates lubricant type, and does not reflect the type of soap, but the soap will usually be lithium. While both types are intended to provide extra protection against wear, one contains EP additives and the other contains molybdenum disulfide. (8) Lithium greases are the most widely used, but calcium, aluminum, polyurea, and sodium-calcium are also used. Furthermore, greases ranging from NLGI 00 to No. 3 are used. Consequently, in many cases, the PEM tables will not be useful for selecting greases. (9) The cling-type gear shield lubricants are residual oils to which a tackiness agent has been added. They are extremely adhesive and so viscous that solvents are added to permit application. After application, the solvent evaporates leaving the adhesive viscous material. Some products contain no solvent and must be heated to reduce viscosity for application. (10) Compounded oils are not included in the list as a separate class. When this type of oil is required, producers must be contacted directly. (11) Ultimately, information brochures provided by the producers must be examined to verify the following: (a) Viscosity. The product viscosity meets the manufacturer’s recommendation or is the same as a previously used lubricant that performed well. When a grease is considered, the viscosity of the included oil should be the same as the previous lubricant. (b) Intended use. The product’s intended use, as given by the producer, corresponds to the application in which the lubricant will be used. (c) Class of lubricant. The class of lubricant is the same as that recommended by the equipment manufacturer or the same as a previously used lubricant that performed well. If the manufacturer recommended an R&O, AW, or EP oil, or a No. 2 lithium grease, that is what should be used. (d) Specification. The product specifications are equal to or better than those recommended by the equipment manufacturer or those of a previously used lubricant that performed well. (e) Additives. The product additives perform the required function even though they may not be chemically identical in several possible alternative lubricants. . 13-4. Specification Types Current government policy encourages use and adoption of nongovernment specifications and standards instead of developing new or updating existing federal and military specifications. Types of specifications, in order of usage preference are: (1) Nongovernment specifications; (2) Commercial Item Descriptions; and (3) Federal and military specifications. a. Nongovernment. Federal and military specifications are being replaced by specifications and industry standards developed by trade associations such as SAE, AGMA, and API and professional private-sector organizations and technical societies such as ISO, ANSI (American National Standards Institute), and ASTM. Nongovernment specifications and standards (NGS) should not be confused with 13-9 EM 1110-2-1424 28 Feb 99 lubricant producer standards. NGS promote competition and usually provide a broad base of suppliers, whereas producer-specific standards tend to limit competition to a single supplier. b. Commercial item description. A Commercial Item Description (CID) is an indexed, simplified product description that describes by salient function or performance characteristics, available and acceptable commercial products that meet the government’s needs. These items include references to ASTM, ANSI, and other industry standards. CIDs are issued by the General Services Administration (GSA) and are listed in the GSA “Index of Federal Specifications, Standards and Commercial Item Descriptions.” c. Federal and military. New Federal specifications are developed and existing specifications are update...
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This note was uploaded on 02/09/2012 for the course MECH 84 taught by Professor Mba during the Spring '11 term at LDSBC.

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