ASTM_D_7450_-_13.pdf

Designation:D745013Standard Specification forPerformance of Rear Axle Gear Lubricants Intended for APICategory GL-5 Service1This standard is issued under the fixed designation D7450;the number immediately following the designation indicates the year 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.1.Scope*1.1 This specification covers test methods and acceptancecriteria for determining the acceptability of gear oils forapplications that specify a lubricant meeting the performancerequirements of API Category GL-5 service.Lubricants thatmeet these performance requirements are typically intended foruse in automotive axles,particularly those containing hypoidgears,operating under various combinations of high-speed/shock-load and low-speed/high-torque conditions.1.2 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 standard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D130 Test Method for Corrosiveness to Copper from Petro-leum Products by Copper Strip TestD892 Test Method for Foaming Characteristics of Lubricat-ing OilsD5704 Test Method for Evaluation of the Thermal andOxidative Stability of Lubricating Oils Used for ManualTransmissions and Final Drive AxlesD6121 Test Method for Evaluation of Load-Carrying Capac-ity of Lubricants Under Conditions of Low Speed andHigh Torque Used for Final Hypoid Drive AxlesD7038 Test Method for Evaluation of Moisture CorrosionResistance of Automotive Gear LubricantsD7452 Test Method for Evaluation of the Load CarryingProperties of Lubricants Used for Final Drive Axles,Under Conditions of High Speed and Shock Loading2.2 Military Standards:3MIL-L-2105C Lubricating Oil,Gear,MultipurposeMIL-L-2105D Lubricating Oil,Gear,MultipurposeMIL-PRF-2105E Lubricating Oil,Gear,Multipurpose2.3 SAE Documents:4J306 Automotive Gear Lubricant Viscosity ClassificationJ2360 Lubricating Oil,Gear Multipurpose(Metric)MilitaryUse3.Terminology3.1 Definitions:3.1.1 ridging,non ring and pinion gears,an alteration ofthe tooth surface to give a series of parallel raised and polishedridges running diagonally in the direction of sliding motion,either partially or completely across the tooth surfaces of gears.D61213.1.2 rippling,non ring and pinion gears,an alteration ofthe tooth surface to give an appearance of a more or lessregular pattern resembling ripples on water or fish scales.D61213.1.3 pitting,non ring and pinion gears,small irregularcavities in the tooth surface,resulting from the breaking out ofsmall areas of surface metal.D61213.1.4 spalling,non ring and pinion gears,the breakingout of flakes of irregular area of the tooth surface,a conditionmore extensive than pitting.D61213.1.5 scoring,non ring and pinion gears,the rapidremoval of metal from the tooth surfaces caused by the tearingout of small contacting particles that have welded together asa result of metal-to-metal contact.The scored surface ischaracterized by a matte or dull finish.D61211This specification is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.B0 on Automotive Lubricants.Current edition approved May 1,2013.Published May 2013.Originallyapproved in 2008.Last previous edition approved in 2008 as D7450 08 DOI:10.1520/D7450-13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/www.dodssp.daps.mil.4Available from Society of Automotive Engineers(SAE),400 CommonwealthDr.,Warrendale,PA 15096-0001,http:/www.sae.org.*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 3.1.6 wear,non ring and pinion gears,the removal ofmetal,without evidence of surface fatigue or adhesive wear,resulting in partial or complete elimination of tool or grindingmarks or development of a discernible shoulder ridge at thebottom of the contact area near the root or at the toe or heel endof pinion tooth contact area(abrasive wear).D61213.2 Definitions of Terms Specific to This Standard:3.2.1lubrited,adjhaving its surface coated with phos-phate.4.Performance Classification