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ASTM D7452-24a

Current Revision

Standard Test Method for Evaluation of the Load Carrying Properties of Lubricants Used for Final Drive Axles, Under Conditions of High Speed and Shock Loading

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1.1 This test method covers the determination of the anti-scoring properties of final drive axle lubricating oils when subjected to high-speed and shock conditions. This test method is commonly referred to as the L-42 test.2

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—SI units are provided for all parameters except where there is no direct equivalent such as the units for screw threads, National Pipe Threads/diameters, tubing size, and single source equipment suppliers.

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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific warning information is given in Sections 4 and 7.

1.4 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.


5.1 Final drive axles are often subjected to severe service where they encounter high speed shock torque conditions, characterized by sudden accelerations and decelerations. This severe service can lead to scoring distress on the ring gear and pinion surface. This test method measures anti-scoring properties of final drive lubricants.

5.2 This test method is used or referred to in the following documents:

5.2.1 American Petroleum Institute (API) Publication 1560.7

5.2.2 SAE J308 and SAE J2360.

SDO ASTM: ASTM International
Document Number D7452
Publication Date Nov. 1, 2024
Language en - English
Page Count 30
Revision Level 24a
Supercedes
Committee D02.B0.03
Publish Date Document Id Type View
Nov. 1, 2024 D7452-24A Revision
March 1, 2024 D7452-24 Revision
Nov. 1, 2022 D7452-22 Revision
July 1, 2019 D7452-19E01 Revision
July 1, 2019 D7452-19 Revision
May 1, 2017 D7452-17 Revision
April 1, 2016 D7452-16 Revision
Oct. 1, 2015 D7452-15 Revision
Oct. 1, 2014 D7452-14 Revision
April 15, 2012 D7452-12 Revision
Nov. 1, 2010 D7452-10 Revision
Oct. 1, 2009 D7452-09A Revision
April 15, 2009 D7452-09 Revision
May 1, 2008 D7452-08 Revision