ASTM D7038-10

This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D7038–09a Designation:D7038–10
Standard Test Method for
Evaluation of Moisture Corrosion Resistance of Automotive
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Gear Lubricants
This standard is issued under the fixed designation D7038; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers a test procedure for evaluating the rust and corrosion inhibiting properties of a gear lubricant while
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subjected to water contamination and elevated temperature in a bench-mounted hypoid differential housing assembly. This test
method is commonly referred to as the L-33-1 test.
1.2 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.
1.2.1 Exceptions—(1) where there is no direct SI equivalent such as screw threads and national pipe threads/diameters, and (2)
the values stated in SI units are to be regarded as standard for the definitions in 12.2, and for SI units where there are no direct
inch-pounds equivalent units.
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.
2. Referenced Documents
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2.1 ASTM Standard:
D235 Specification for Mineral Spirits (Petroleum Spirits) (Hydrocarbon Dry Cleaning Solvent)
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2.2 Society of Automotive Engineers Standards:
J308 Information Report on Axle and Manual Transmission Lubricants
J2360 Lubricating Oil, Gear Multipurpose (Metric) Military Use
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2.3 U.S. Military Specifications:
MIL-PRF-2105E Lubricating Oil, Gear, General Multipurpose
MIL-P-3420F NOX-RUST Paper
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 corrosion, n—an alteration of a finished metal surface by discoloration, accompanied by roughening not attributable to
mechanical action.
3.1.2 downtime, n—an interruption of power to the test unit for a period greater than ten seconds.
3.1.3 rust, n—a special case of corrosion, which always deteriorates or alters the original surface condition.
3.1.3.1 Discussion—Rust always has color (usually, but not limited to red, yellow, brown, black) and one of the following
descriptive characteristics: (1) depth; the rusted surface is built up relative to that of adjacent areas. (2) texture; the surface may
appear to be etched, scaly or otherwise visibly different than adjacent areas.
3.1.4 stain, n—a surface modification that is attributable to discoloration only.
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This test method is under the jurisdiction ofASTM Committee D02 on Petroleum Products and Lubricants and is the direct responsibility of Subcommittee D02.B0 on
Automotive Lubricants.
Current edition approved Oct. 1, 2009.2010. Published November 2009.2010. Originally approved in 2004. Last previous edition approved in 2009 as D7038–09a. DOI:
10.1520/D7038-09a.10.1520/D7038-10.
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Untilthenextrevisionofthistestmethod,theASTMTestMonitoringCenter(TMC)willupdatechangesinthistestmethodbymeansofInformationLetters.Thisedition
includes all Information Letters through 09–01.09–02. Information Letters may be obtained from the ASTM TMC, 6555 Penn Ave., Pittsburgh, PA 15206-4489, Attention:
Administrator. The TMC is also the source of reference oils.
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For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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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Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001.
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D7038–10
4. Summary of Test Method
4.1 This procedure utilizes a Dana Corporation Model 30 hypoid differential assembly, Part No. 27770–1X, 4:10 ratio, standard
,
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differential with uncoated ring and pinion, without axle tubes.
4.2 Test Unit Preparation—Prior to each test, complet
...