1、Designation:D5579191Standard Test Method forEvaluating the Thermal Stability of Manual TransmissionLubricants in a Cyclic Durability Test1This standard is issued under the fixed designation D5579;the number immediately following the designation indicates the year oforiginal adoption or,in the case o
2、f 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.1NOTEEditorially updated TMC governance information in June 2022.INTRODUCTIONPortions of this test method are w
3、ritten for use by laboratories that make use of ASTM TestMonitoring Center(TMC)2,3services(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 laboratori
4、es previouslycalibrated by the TMC.In general,the test purchaser decides if a calibrated test stand is to be used.Organizations such astheAmerican Chemistry Council require that a laboratory utilize the TMC services as part of their testregistration process.In addition,the American Petroleum Institu
5、te and the Gear Lubricant ReviewCommittee 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(andhe
6、nce the test purchaser)has an assurance 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.ASTM
7、International policy is to encourage the development of test procedures based on genericequipment.It is recognized that there are occasions where critical/sole-source equipment has beenapproved by the technical committee(surveillance panel/task force)and is required by the testprocedure.The technica
8、l committee that oversees the test procedure is encouraged to clearly identifyif the part is considered critical in the test procedure.If a part is deemed to be critical,ASTMencourages alternative suppliers to be given the opportunity for consideration of supplying the criticalpart/component providi
9、ng they meet the approval process set forth by the technical committee.An alternative supplier can start the process by initiating contact with the technical committee(current chairs shown on ASTM TMC website).The supplier should advise on the details of the partthat is intended to be supplied.The t
10、echnical committee will review the request and determinefeasibility of an alternative supplier for the requested replacement critical part.In the event that areplacement critical part has been identified and proven equivalent the sole-source supplier footnoteshall be removed from the test procedure.
11、1This test method 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 May 1,2019.Published June 2019.Originallyapproved in 1994.Last pr
12、evious edition approved in 2016 as D5579 16.DOI:10.1520/D5579-19E01.2ASTM Test Monitoring Center,203 Armstrong Drive,Freeport,PA 16229,http:/www.astmtmc.org.3Until the next revision of this test method,the ASTM Test Monitoring Centerwill update changes in the test method by means of information lett
13、ers.Informationletters may be obtained from the ASTM Test Monitoring Center,203 ArmstrongDrive,Freeport,PA 16229,http:/www.astmtmc.org.Attention:Director.Thisedition incorporates revisions in all information Letters through 18-1.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Con
14、shohocken,PA 19428-2959.United StatesThis international standard was developed 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 Orga
15、nization Technical Barriers to Trade(TBT)Committee.11.Scope*1.1 This test method covers the thermal stability of fluids foruse in heavy duty manual transmissions when operated at hightemperatures.1.2 The lubricant performance is measured by the numberof shifting cycles that can be performed without
16、failure ofsynchronization when the transmission is operated while con-tinuously cycling between high and low range.1.3 Correlation of test results with truck transmission ser-vice has not been established.However,the procedure has beenshown to appropriately separate two transmission lubricants,which have shown satisfactory and unsatisfactory field perfor-mance in the trucks of one manufacturer.1.4 Changes in this test method may be necessary due torefinements in the procedure,obsolescence of par
