Designation:D6121−19a´1StandardTestMethodforEvaluationofLoad-CarryingCapacityofLubricantsUnderConditionsofLowSpeedandHighTorqueUsedforFinalHypoidDriveAxles1ThisstandardisissuedunderthefixeddesignationD6121;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—EditoriallyupdatedTMCgovernanceinformationinJune2022.INTRODUCTIONThistestmethodiswrittenforusebylaboratoriesthatusetheportionsofthetestmethodthatrefertoASTMTestMonitoringCenter(TMC)services(seeAnnexA1–AnnexA4).LaboratoriesthatchoosenottousetheTMCservicesmaysimplydisregardtheseportions.TheTMCprovidesreferenceoils,andengineeringandstatisticalservicestolaboratoriesthatdesiretoproducetestresultsthatarestatisticallysimilartothoseproducedbylaboratoriespreviouslycalibratedbytheTMC.Ingeneral,theTestPurchaserdecidesifacalibratedteststandistobeused.OrganizationssuchastheAmericanChemistryCouncilrequirethatalaboratoryutilizetheTMCservicesaspartoftheirtestregistrationprocess.Inaddition,theAmericanPetroleumInstituteandtheGearLubricantReviewCommitteeoftheLubricantReviewInstitute(SAEInternational)requirethatalaboratoryusetheTMCservicesinseekingqualificationofoilsagainsttheirspecifications.NOTE1—TheadvantageofusingtheTMCservicestocalibrateteststandsisthatthetestlaboratory(andhencetheTestPurchaser)hasanassurancethattheteststandwasoperatingattheproperleveloftestseverity.ItshouldalsobeborneinmindthatresultsobtainedinanoncalibratedteststandmaynotbethesameasthoseobtainedinateststandparticipatingintheASTMTMCservicesprocess.1.Scope*1.1ThistestmethodiscommonlyreferredtoastheL-37test.2Thistestmethodcoversatestprocedureforevaluatingtheload-carrying,wear,andextremepressurepropertiesofagearlubricantinahypoidaxleunderconditionsoflow-speed,high-torqueoperation.1.2Thistestmethodalsoprovidesfortherunningofthelowaxletemperature(C...
