Designation:D7420−18StandardTestMethodforDeterminingTribomechanicalPropertiesofGreaseLubricatedPlasticSocketSuspensionJointsUsingaHigh-Frequency,Linear-Oscillation(SRV)TestMachine1ThisstandardisissuedunderthefixeddesignationD7420;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONThistestmethodwasoriginallypublishedasbilingualcompanystandardTRW62051301inJune2002.TRWFahrwerksysteme2transferredthecopyrightonOct.5,2004tostandardizationbodies.TheDIN51834workinggrouphasmodifiedthisstandardbyaddingprecisioninformationbasedonroundrobintests.1.Scope*1.1Thistestmethodcoversaprocedurefordeterminingthefrictionandwearbehaviorofgreaselubricatedplasticsocketsuspensionjoints,forvalidationofsuspensionjointgreasesandqualityinspectionforthosegreasesunderhigh-frequencylinear-oscillationmotionusingtheSRVtestmachine.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:3A295SpecificationforHigh-CarbonAnti-FrictionBearingSteelD217TestMethodsforConePenetrationofLubricatingGreaseD4175TerminologyRelatingtoPetroleumProducts,LiquidFuels,andLubricantsD5706TestMethodforDeterminingExtremePressurePropertiesofLubricatingGreasesUsingaHigh-Frequency,Linear-Oscilla...
