ASTM D6121-02

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

SCOPE
1.1 This test method is commonly referred to as the L-37 test. This test method covers a test peocedure 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.

General Information

• Status: Historical
• Publication Date: 09-Jun-2002
• ICS: 75.100 - Lubricants, industrial oils and related products
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.B0 - Automotive Lubricants

Relations

• Replaces: ASTM D6121-01 - 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
• Effective Date: 10-Jun-2002
• Replaced By: ASTM D6121-03 - 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
• Effective Date: 10-May-2003
• Referred By: ASTM D7450-19 - Standard Specification for Performance of Rear Axle Gear Lubricants Intended for API Category GL-5 Service
• Effective Date: 10-Jun-2002
• Referred By: ASTM D8165-22 - Standard Test Method for Evaluation of Load-Carrying Capacity of Lubricants Used in Hypoid Final-Drive Axles Operated under Low-Speed and High-Torque Conditions
• Effective Date: 10-Jun-2002

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
An American National Standard
Designation: D 6121 – 02
Standard Test Method for
Evaluation of the Load Carrying Capacity of Lubricants
Under Conditions of Low Speed and High Torque Used for
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Final 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 (CRC Rating
provided for informational purposes only.
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Manual No. 18).
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 hazard
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. 18).
2. Referenced Documents 3.1.3 burnish, n—on ring and pinion gears, an alteration of
the original manufactured surface to a dull or brightly polished
2.1 ASTM Standards:
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condition (CRC Rating Manual No. 17).
D 235 Specification for Mineral Spirits (Petroleum Spirits)
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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. 17).
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. 17).
3.1.6 discoloration, n—on ring and pinion gears, any alter-
1 ation in the normal color of finished steel surfaces (CRC Rating
This test method is under the jurisdiction of ASTM Committee D02 on
Manual No. 17).
Petroleum Products and Lubricantsand is the direct responsibility of Subcommittee
D02.B0on Automotive Lubricants.
3.1.7 pitting, n—on ring and pinion gears, small irregular
Current edition approved June 10, 2002. Published October 2002. Originally
cavities in the tooth surface, resulting from the breaking out of
published as D 6121–97. Last previous edition D 6121–01.
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small areas of surface metal (CRC Rating Manual No. 17).
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. 01-2. 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
oils.
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Annual Book of ASTM Standards, Vol 06.04.
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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., Suite 201, Available from Coordinating Research Council (CRC), 219 Perimeter Ctr.
Alexandria, VA 22314. Pkwy., Atlanta, GA 30346.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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