ASTM D7452-15
(Test Method)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
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
SIGNIFICANCE AND USE
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.
SCOPE
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 and health practices and determine the applicability of regulatory limitations prior to use. Specific warning information is given in Sections 4 and 7.
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Designation: D7452 − 15
StandardTest Method for
Evaluation of the Load Carrying Properties of Lubricants
Used for Final Drive Axles, Under Conditions of High Speed
1
and Shock Loading
This standard is issued under the fixed designation D7452; 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.
4
1. Scope* 2.2 Society of Automotive Engineers Standards:
SAE J308 Information Report on Axle and Manual Trans-
1.1 This test method covers the determination of the anti-
mission Lubricants
scoring properties of final drive axle lubricating oils when
SAE J2360 Lubricating Oil, Gear Multipurpose (Metric)
subjectedtohigh-speedandshockconditions.Thistestmethod
2 Military Use
is commonly referred to as the L-42 test.
1.2 The values stated in inch-pound units are to be regarded
3. Terminology
as standard. The values given in parentheses are mathematical
3.1 Definitions of Terms Specific to This Standard:
conversions to SI units that are provided for information only
3.1.1 coast side, n—the convex side of the pinion and the
and are not considered standard.
concave side of the ring gear which are in contact during
1.2.1 Exceptions—SI units are provided for all parameters
deceleration in a forward gear.
except where there is no direct equivalent such as the units for 5
ASTM Distress Rating Manual 21
screw threads, National Pipe Threads/diameters, tubing size,
3.1.2 drive side, n—the concave side of the pinion and the
and single source equipment suppliers.
convex side of the ring gear which are in contact during
1.3 This standard does not purport to address all of the
acceleration in a forward gear.
safety concerns, if any, associated with its use. It is the
ASTM Distress Rating Manual 21
responsibility of the user of this standard to establish appro-
3.1.3 scoring, n—on the ring and the pinion gear teeth, the
priate safety and health practices and determine the applica-
displacement of metal by local momentary welding from the
bility of regulatory limitations prior to use. Specific warning
gear tooth, resulting in the development of a matt, or frosted
information is given in Sections 4 and 7.
dull surface.
ASTM Distress Rating Manual 21
2. Referenced Documents
3
2.1 ASTM Standards:
4. Summary of Test Method
D235 Specification for Mineral Spirits (Petroleum Spirits)
4.1 Charge a specially prepared light duty hypoid rear axle
(Hydrocarbon Dry Cleaning Solvent)
6
(Dana Model 44 ASTM Part No. 044AA100-1) with the
E29 Practice for Using Significant Digits in Test Data to
lubricant sample to be tested (see 10.1). Mount the axle
Determine Conformance with Specifications
between two load absorbing dynamometers which are driven
with a V-8 gasoline engine through a manual transmission.
1
This test method is under the jurisdiction of ASTM Committee D02 on
4.2 Condition the test axle with light loads at different
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
speed, torque and temperature conditions on both the drive and
Subcommittee D02.B0.03 on Automotive Gear Lubricants & Fluids.
Current edition approved Oct. 1, 2015. Published November 2015. Originally coast sides of the gears. (Warning—High-speed rotating
approved in 2008. Last previous edition approved in 2014 as D7452 – 14. DOI:
equipment, electrical shock, high-temperature surfaces.) After
10.1520/D7452-15.
conditioning, subject the test axle to high speed and shock
2
Until the next revision of this test method, the ASTM Test Monitoring Center
loadings at higher temperatures.
(TMC) will update changes in this test method by means of information letters.
Information letters may be obtained from the ASTM Test Monitoring Center, 6555
Penn Avenue, Pittsburgh, PA 15206, Attention: Administrator. This edition incor-
4
porates revisions in all information Letters through No. 15–1. The TMC is also a Available from Society of Automotive Engineers (SAE), 400 Commonwealth
source of reference oils. Dr., Warrendale, PA 15096-0001, http://www.sae.org.
3 5
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Formerly known as CRC Rating Manual, No. 21. Available from the ASTM
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM website, www.astm.org, ASTM Stock No. TMCMNL21.
6
Standards volume information, refer to the standard’s Document Summary page on Parts and Model 44 Maintenance Manual available from Dana Corporation,
the ASTM website. P.O. Box 2424, Fort Wayne, IN 46801.
*A Summary of Changes section appears at the end of this standard
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Cons
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM 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: D7452 − 14 D7452 − 15
Standard Test Method for
Evaluation of the Load Carrying Properties of Lubricants
Used for Final Drive Axles, Under Conditions of High Speed
1
and Shock Loading
This standard is issued under the fixed designation D7452; 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 the determination of the anti-scoring properties of final drive axle lubricating oils when subjected
2
to high-speed and shock conditions. This test method is commonly referred to as the L-42 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—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 and health practices and determine the applicability of regulatory
limitations prior to use. Specific warning information is given in Sections 4 and 7.
2. Referenced Documents
3
2.1 ASTM 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
4
2.2 Society of Automotive Engineers Standards:
SAE J308 Information Report on Axle and Manual Transmission Lubricants
SAE J2360 Lubricating Oil, Gear Multipurpose (Metric) Military Use
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 coast side, n—the convex side of the pinion and the concave side of the ring gear which are in contact during deceleration
5
in a forward gear. CRC Manual 21
5
ASTM Distress Rating Manual 21
3.1.2 drive side, n—the concave side of the pinion and the convex side of the ring gear which are in contact during acceleration
5
in a forward gear. CRC Manual 21
ASTM Distress Rating Manual 21
3.1.3 scoring, n—on the ring and the pinion gear teeth, the displacement of metal by local momentary welding from the gear
5
tooth, resulting in the development of a matt, or frosted dull surface. CRC Manual 21
ASTM Distress Rating Manual 21
1
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcommittee
D02.B0.03 on Automotive Gear Lubricants & Fluids.
Current edition approved Oct. 1, 2014Oct. 1, 2015. Published October 2014November 2015. Originally approved in 2008. Last previous edition approved in 20102014
as D7452 – 10.D7452 – 14. DOI: 10.1520/D7452-14.10.1520/D7452-15.
2
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. Information
letters may be obtained from the ASTM Test Monitoring Center, 6555 Penn Avenue, Pittsburgh, PA 15206, Attention: Administrator. This edition incorporates revisions in
all information Letters through No. 14–1.15–1. The TMC is also a source of reference oils.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 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.
4
Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001, http://www.sae.org.
5
Formerly known as CRC Rating Manual, No. 21,21. Coordinating Research Council, Atlanta, GA.Available from the ASTM website, www.astm.org, ASTM Stock No.
TMCMNL21.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7452 − 15
4. Summary of Test Method
6
4.1 Charge a specially prepared light duty hypoid rear axle (Dana Model 44 ASTM Part No. 044AA100-1) with the lubricant
sample to be tested (see 10.1). Mount the axle b
...
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