1、Designation:D745222Standard Test Method forEvaluation of the Load Carrying Properties of LubricantsUsed for Final Drive Axles,Under Conditions of High Speedand Shock Loading1This standard is issued under the fixed designation D7452;the number immediately following the designation indicates the year
2、oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONPortions of this test method are written for use by laboratorie
3、s that make use of ASTM TestMonitoring Center(TMC)2services(see Annex A1 Annex A4).The TMC provides reference oils,and engineering and statistical services to laboratories that desireto produce test results that are statistically similar to those produced by laboratories previouslycalibrated by the
4、TMC.In general,the Test Purchaser decides if a calibrated test stand is to be used.Organizations such asthe American Chemistry Council require that a laboratory use the TMC services as part of their testregistration process.In addition,the American Petroleum Institute and the Gear Lubricant ReviewCo
5、mmittee of the Lubricant Review Institute(SAE International)require that a laboratory use theTMC services in seeking qualification of oils against their specifications.The advantage of using the TMC services to calibrate test stands is that the test laboratory(andhence the Test Purchaser)has an assu
6、rance that the test stand was operating at the proper level of testseverity.It should also be borne in mind that results obtained in a non-calibrated test stand may notbe the same as those obtained in a test stand participating in the ASTM TMC services process.Laboratories that choose not to use the
7、 TMC services may simply disregard these portions.1.Scope*1.1 This test method covers the determination of the anti-scoring properties of final drive axle lubricating oils whensubjected to high-speed and shock conditions.This test methodis commonly referred to as the L-42 test.21.2 The values stated
8、 in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.2.1 ExceptionsSI units are provided for all parametersexcept where there is no direct equivalent such as
9、the units forscrew threads,National Pipe Threads/diameters,tubing size,and single source equipment suppliers.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,he
10、alth,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.Specific warning information is given in Sections 4 and 7.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established i
11、n the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3D235 Specification for Mineral Spirits(Petroleum Spirits)1This test method
12、is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.B0.03 on Automotive Gear Lubricants&Fluids.Current edition approved Nov.1,2022.Published November 2022.Originallyapproved in 2008.Last previous edition
13、 approved in 2019 as D7452 191.DOI:10.1520/D7452-22.2Until the next revision of this test method,the ASTM Test Monitoring Center(TMC)will update changes in this test method by means of information letters.Information letters may be obtained from the ASTM Test Monitoring Center,203Armstrong Drive,Fre
14、eport,PA16229,Attention:Director.This edition incorporatesrevisions in all information Letters through No.22-1.The TMC is also a source ofreference oils.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStanda
15、rds volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was develope
16、d in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1(Hydrocarbon Dry Cleaning Solvent)E29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 Society of Automotive Engineers Standards:4SAE J308 Information Report on Axle and Manual
