ASTM D6121-03a
(Test Method)Standard Test Method for Evaluation of the Load Carrying Capacity of Lubricants Under Conditions of Low Speed and High Torque Used for Final Hypoid Drive Axles
Standard Test Method for Evaluation of the Load Carrying Capacity of Lubricants Under Conditions of Low Speed and High Torque Used for Final Hypoid Drive Axles
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1.1 This test method is commonly referred to as the L-37 test. 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 The values stated in inch-pound units are to be regarded as the standard. The SI values given in parentheses are provided for informational purposes only.
1.3 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 and health practices and determine the applicability of regulatory limitations prior to use. Specific hazard information is given in Sections 4, 7, and 8.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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An American National Standard
Designation: D 6121 – 03a
Standard Test Method for
Evaluation of Load-Carrying Capacity of Lubricants Under
Conditions of Low Speed and High Torque Used for Final
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Hypoid Drive Axles
This standard is issued under the fixed designation D 6121; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope SAE J308 Information Report on Axle and Manual Trans-
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mission Lubricants
1.1 This test method is commonly referred to as the L-37
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test. This test method covers a test procedure for evaluating
3. Terminology
the load-carrying, wear, and extreme pressure properties of a
3.1 Definitions of Terms Specific to This Standard:
gear lubricant in a hypoid axle under conditions of low-speed,
3.1.1 abrasive wear, n—on ring and pinion gears, removal
high-torque operation.
of material from the operating surface of the gear caused by
1.2 The values stated in inch-pound units are to be regarded
lapping of mating surfaces by fine particles suspended in
as the standard. The SI values given in parentheses are
lubricant, fuel, or air or imbedded in a surface.
provided for informational purposes only.
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CRC Rating Manual No. 21
1.3 This standard does not purport to address all of the
3.1.2 adhesive wear, n—on ring and pinion gears, removal
safety concerns, if any, associated with its use. It is the
of material from the operating surface of the gear caused by
responsibility of the user of this standard to establish appro-
shearing of junctions formed between operating surfaces in
priate safety and health practices and determine the applica-
direct metal-to-metal contact; sheared-off particles either re-
bility of regulatory limitations prior to use. Specific warning
main affixed to the harder of the mating surfaces or act as wear
information is given in Sections 4, 7, and 8.
particles between the surfaces. CRC Rating Manual No. 21
2. Referenced Documents 3.1.3 burnish, n—on ring and pinion gears, an alteration of
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the original manufactured surface to a dull or brightly polished
2.1 ASTM Standards:
condition. CRC Rating Manual No. 21
D 235 Specification for Mineral Spirits (Petroleum Spirits)
3.1.4 corrosion, n—in final drive axles, a general alteration
(Hydrocarbon Dry Cleaning Solvent)
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of the finished surfaces of bearings or gears by discoloration,
2.2 Military Specification:
accompanied by roughening not attributable to mechanical
MIL-PRF-2105E Lubricating Oil, Gear, Multipurpose
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action. CRC Rating Manual No. 21
2.3 AGMA National Standard:
3.1.5 deposits, n—in final drive axles, material of pasty,
Nomenclature of Gear Tooth Failure Modes
gummy, or brittle nature adhering to or collecting around any
2.4 SAE Standard:
of the working parts. CRC Rating Manual No. 21
3.1.6 discoloration, n—on ring and pinion gears, any alter-
1 ation in the normal color of finished steel surfaces.
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee CRC Rating Manual No. 21
D02.B0 on Automotive Lubricants.
3.1.7 pitting, n—on ring and pinion gears, small irregular
Current edition approved Nov. 1, 2003. Published January 2004. Originally
cavities in the tooth surface, resulting from the breaking out of
approved in 1997. Last previous edition approved in 2003 as D 6121–03.
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small areas of surface metal. CRC Rating Manual No. 21
Until the next revision of this test method, the ASTM Test Monitoring Center
(TMC) will update changes in this test method by means of Information Letters.
3.1.8 ridging, n—on ring and pinion gears, an alteration of
This edition includes all Information Letters through No. 03-3. Information Letters
the tooth surface to give a series of parallel raised and polished
may be obtained from the ASTM Test Monitoring Center, 6555 Penn Ave,
ridges running diagonally in the direction of sliding motion,
Pittsburgh, PA 15206, Attn: Administrator. The TMC is also the source of reference
either partially or completely across the tooth surfaces of gears.
oils.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
CRC Rating Manual No. 21
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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Standardization Documents Order Desk, Bldg 4, Section D, 700 Robbins Available from Society of Automotive Engineers (SAE), 400 Commonwealth
Avenue, Philadelphia, PA 19111–5094, Attn: NPODS. Dr., Warrendale, PA 15096-0001.
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American Gear Manufacturers Assn. (AGMA), 1500 King St., Suit
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