1、Designation:D557915Standard 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 of
2、 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.INTRODUCTIONThis test method is written for use by laboratories that use the portions of the test method that re
3、fertoASTM Test Monitoring Center(TMC)services(seeAnnexA1).Laboratories that choose not to usethe TMC services may simply disregard these portions.The TMC provides reference oils,and engineering and statistical services to laboratories that desireto produce test results that are statistically similar
4、 to those produced by laboratories previouslycalibrated by the 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,t
5、he American Petroleum Institute 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.NOTE1The advantage of using the TMC services to calibrate test stands
6、 is that the test laboratory(and hence theTest Purchaser)has an assurance that the test stand was operating at the proper level of test severity.It should also beborne in mind that results obtained in a non calibrated test stand may not be the same as those obtained in a test standparticipating in t
7、he ASTM TMC services process.1.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 failure ofsynchronizati
8、on 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 satisfactor
9、y 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 parts,orreagents,and so forth.These changes will be incorporated byInformation Letters issued by the ASTM Test MonitoringCente
10、r(TMC).2The test method will be revised to show thecontent of all the letters,as issued.1.5 The values stated 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 standar
11、d.1.5.1 ExceptionWhen materials,products,or equipmentare available only in inch-pound units,SI units are omitted.1.6 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 safet
12、y and health practices and determine the applica-bility of regulatory limitations prior to use.1.7 This test method is arranged as follows:1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommitte
13、e D02.B0.03 on Automotive Gear Lubricants&Fluids.Current edition approved April 1,2015.Published May 2015.Originallyapproved in 1994.Last previous edition approved in 2014 as D5579 14.DOI:10.1520/D5579-15.This edition incorporates revisions in all Information Letters through No.141.2ASTM Test Monito
14、ring Center,6555 Penn Ave.,Pittsburgh,PA 15206-4489.*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 States1 SectionScope1Referenced Documents2Terminology3Summary of Test Method4Sign
15、ificance and Use5Apparatus6Test Transmission6.2Transmission Mounts6.3Oil-Circulating System6.4Oil Return Hole6.5Air Pressure Controls6.6Drive System6.7Instrumentation6.8Thermocouple Placement6.9Reagents and Materials7Safety8Preparation of Apparatus9Cleaning of Parts9.1Assembly9.2Calibration10Transmi
16、ssion and Test Stand Calibration10.1Reference Oils10.2Reference Oil Test Frequency10.3Instrumentation Calibration10.4Shift Time Calibration10.5Operating Procedure11System Flush and Charge11.1Test Operation11.2Shut-Down Procedure11.3Transmission Disassembly11.4Determination of Test Results12Failure Criteria12.1Shifter Fork Wear12.2Test Validity Determination12.3Report13Precision and Bias14Keywords15Test Validity Calculations and LimitsAnnex A5HTCT Test Report Forms and Data DictionaryAnnex A6Manu
