ASTM D7450-13
(Specification)Standard Specification for Performance of Rear Axle Gear Lubricants Intended for API Category GL-5 Service
Standard Specification for Performance of Rear Axle Gear Lubricants Intended for API Category GL-5 Service
SCOPE
1.1 This specification covers test methods and acceptance criteria for determining the acceptability of gear oils for applications that specify a lubricant meeting the performance requirements of API Category GL-5 service. Lubricants that meet these performance requirements are typically intended for use in automotive axles, particularly those containing hypoid gears, operating under various combinations of high-speed/shock-load and low-speed/high-torque conditions.
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.
1.3 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.
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Designation:D7450 −13
Standard Specification for
Performance of Rear Axle Gear Lubricants Intended for API
1
Category GL-5 Service
This standard is issued under the fixed designation D7450; 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* Resistance of Automotive Gear Lubricants
D7452 Test Method for Evaluation of the Load Carrying
1.1 This specification covers test methods and acceptance
Properties of Lubricants Used for Final Drive Axles,
criteria for determining the acceptability of gear oils for
Under Conditions of High Speed and Shock Loading
applications that specify a lubricant meeting the performance
3
2.2 Military Standards:
requirements of API Category GL-5 service. Lubricants that
MIL-L-2105C Lubricating Oil, Gear, Multipurpose
meettheseperformancerequirementsaretypicallyintendedfor
MIL-L-2105D Lubricating Oil, Gear, Multipurpose
use in automotive axles, particularly those containing hypoid
MIL-PRF-2105E Lubricating Oil, Gear, Multipurpose
gears, operating under various combinations of high-speed/
4
shock-load and low-speed/high-torque conditions.
2.3 SAE Documents:
J306 Automotive Gear Lubricant Viscosity Classification
1.2 The values stated in inch-pound units are to be regarded
J2360 Lubricating Oil, Gear Multipurpose (Metric) Military
as standard. The values given in parentheses are mathematical
Use
conversions to SI units that are provided for information only
and are not considered standard.
3. Terminology
1.3 This standard does not purport to address all of the
3.1 Definitions:
safety concerns, if any, associated with its use. It is the
3.1.1 ridging, n—on ring and pinion gears, an alteration of
responsibility of the user of this standard to establish appro-
the tooth surface to give a series of parallel raised and polished
priate safety and health practices and determine the applica-
ridges running diagonally in the direction of sliding motion,
bility of regulatory limitations prior to use.
eitherpartiallyorcompletelyacrossthetoothsurfacesofgears.
D6121
2. Referenced Documents
2
3.1.2 rippling, n—on ring and pinion gears, an alteration of
2.1 ASTM Standards:
the tooth surface to give an appearance of a more or less
D130 Test Method for Corrosiveness to Copper from Petro-
regular pattern resembling ripples on water or fish scales.
leum Products by Copper Strip Test
D6121
D892 Test Method for Foaming Characteristics of Lubricat-
ing Oils
3.1.3 pitting, n—on ring and pinion gears, small irregular
D5704 Test Method for Evaluation of the Thermal and
cavities in the tooth surface, resulting from the breaking out of
Oxidative Stability of Lubricating Oils Used for Manual
small areas of surface metal. D6121
Transmissions and Final Drive Axles
3.1.4 spalling, n—on ring and pinion gears, the breaking
D6121 Test Method for Evaluation of Load-Carrying Capac-
out of flakes of irregular area of the tooth surface, a condition
ity of Lubricants Under Conditions of Low Speed and
more extensive than pitting. D6121
High Torque Used for Final Hypoid Drive Axles
3.1.5 scoring, n—on ring and pinion gears, the rapid
D7038 Test Method for Evaluation of Moisture Corrosion
removal of metal from the tooth surfaces caused by the tearing
out of small contacting particles that have welded together as
1
a result of metal-to-metal contact. The scored surface is
This specification is under the jurisdiction of ASTM Committee D02 on
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
characterized by a matte or dull finish. D6121
Subcommittee D02.B0 on Automotive Lubricants.
Current edition approved May 1, 2013. Published May 2013. Originally
approved in 2008. Last previous edition approved in 2008 as D7450 – 08 DOI:
3
10.1520/D7450-13. Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM www.dodssp.daps.mil.
4
Standards volume information, refer to the standard’s Document Summary page on Available from Society of Automotive Engineers (SAE), 400 Commonwealth
the ASTM website. Dr., Warrendale, PA 15096-0001, http://www.sae.org.
*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 ----------------------
D7450−13
TABLE 1 API Category GL-5 Tests and Acceptance Criteria
Test Item Minimum Maximum
...
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: D7450 − 08 D7450 − 13
Standard Specification for
Performance of Rear Axle Gear Lubricants Intended for API
1
Category GL-5 Service
This standard is issued under the fixed designation D7450; 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 Scope*
1.1 This specification covers test methods and acceptance criteria for determining the acceptability of gear oils for applications
whichthat specify a lubricant meeting the performance requirements of API Category GL-5 service. Lubricants whichthat meet
these performance requirements are typically intended for use in automotive axles, particularly those containing hypoid gears,
operating under various combinations of high-speed/shock-load and low-speed/high-torque conditions.
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.
1.3 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
2
2.1 ASTM Standards:
D130 Test Method for Corrosiveness to Copper from Petroleum Products by Copper Strip Test
D892 Test Method for Foaming Characteristics of Lubricating Oils
D5704 Test Method for Evaluation of the Thermal and Oxidative Stability of Lubricating Oils Used for Manual Transmissions
and Final Drive Axles
D6121 Test Method for Evaluation of Load-Carrying Capacity of Lubricants Under Conditions of Low Speed and High Torque
Used for Final Hypoid Drive Axles
D7038 Test Method for Evaluation of Moisture Corrosion Resistance of Automotive Gear Lubricants
D7452 Test Method for Evaluation of the Load Carrying Properties of Lubricants Used for Final Drive Axles, Under Conditions
of High Speed and Shock Loading
3
2.2 Military Standards:
MIL-L-2105C Lubricating Oil, Gear, Multipurpose
MIL-L-2105D Lubricating Oil, Gear, Multipurpose
MIL-PRF-2105E Lubricating Oil, Gear, Multipurpose
4
2.3 ASTM Test Monitoring Center Documents:
L-42 Test Procedure
4
2.3 SAE Documents:
J306 Automotive Gear Lubricant Viscosity Classification
J2360 Lubricating Oil, Gear Multipurpose (Metric) Military Use
3. Terminology
3.1 Definitions:
1
This specification is under the jurisdiction of ASTM Committee D02 on Petroleum Products and Lubricants and is the direct responsibility of Subcommittee D02.B0 on
Automotive Lubricants.
Current edition approved May 1, 2008May 1, 2013. Published June 2008May 2013. Originally approved in 2008. Last previous edition approved in 2008 as D7450 – 08
DOI: 10.1520/D7450-08.10.1520/D7450-13.
2
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.
3
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://www.dodssp.daps.mil.
4
Available from ASTM Test Monitoring Center, 6555 Penn Avenue, Pittsburgh, PA 15206–4489, Attn: Administrator.
4
Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001, http://www.sae.org.
*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 ----------------------
D7450 − 13
3.1.1 ridging, n—on ring and pinion gears, an alteration of the tooth surface to give a series of parallel raised and polished
ridges running diagonally in the direction of sliding motion, either partially or completely across the tooth surfaces of gears. D6121
3.1.2 rippling, n—on ring and pinion gears, an alteration of the tooth surface to give an appearance of a more or less regular
pattern resembling ripples on water or fish scales. D6121
3.1.3 pitting, n—on ring and pinion gears, small irregular cavities in the tooth surface, resulting from the breaking out of small
areas of surface metal. D6121
3.1.4 sp
...
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