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Significance and Use
5.1 This test method measures a lubricant's ability to protect final drive axles from abrasive wear, adhesive wear, plastic deformation, and surface fatigue when subjected to low-speed, high-torque conditions. Lack of protection can lead to premature gear or bearing failure, or both.
5.2 This test method is used, or referred to, in the following documents:
5.2.1 American Petroleum Institute (API) Publication 1560.8
5.2.2 STP-512A.9
5.2.3 SAE J308.
5.2.4 Military Specification MIL-PRF-2105E.
5.2.5 SAE J2360.
1. Scope
1.1 This test method is commonly referred to as the L-37 test.2 This test method covers a test procedure for evaluating the load-carrying, wear, and extreme pressure properties of a gear lubricant in a hypoid axle under conditions of low-speed, high-torque operation.
1.2 This test method also provides for the running of the low axle temperature (Canadian) L-37 test. The procedure for the low axle temperature (Canadian) L-37 test is identical to the standard L-37 test with the exceptions of the items specifically listed in Annex A9. The procedure modifications listed in Annex A9 refer to the corresponding section of the standard L-37 test method.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3.1 Exceptions—In Table A12.1, the values stated in SI units are to be regarded as standard. Also, no SI unit is provided where there is not a direct SI equivalent.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific warning information is given in Sections 4 and 7.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
SAE Standard
SAE J2360 Lubricating Oil, Gear Multipurpose (Metric) Military Use SAE J308 Information Report on Axle and Manual Transmission LubricantsAGMA National Standard
Nomenclature of Gear Tooth Failure ModesMilitary Specification
MIL-PRF-2105E Lubricating Oil, Gear, MultipurposeASTM Standards
D235 Specification for Mineral Spirits (Petroleum Spirits) (Hydrocarbon Dry Cleaning Solvent)
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
ICS Code
ICS Number Code 75.100 (Lubricants, industrial oils and related products)
UNSPSC Code
UNSPSC Code 25173801(Driving axles); 15120000(Lubricants and oils and greases and anti corrosives)
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DOI: 10.1520/D6121-19A
Citation Format
ASTM D6121-19a, Standard Test Method for Evaluation of Load-Carrying Capacity of Lubricants Under Conditions of Low Speed and High Torque Used for Final Hypoid Drive Axles, ASTM International, West Conshohocken, PA, 2019, www.astm.org
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