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Scope

1.1 This test method covers the thermal stability of fluids for use in heavy duty manual transmissions when operated at high temperatures.

1.2 The lubricant performance is measured by the number of shifting cycles that can be performed without failure of synchronization when the transmission is operated while continuously cycling between high and low range.

1.3 Correlation of test results with truck transmission service has not been established. However, the procedure has been shown to appropriately separate two transmission lubricants, which have shown satisfactory and unsatisfactory field performance in the trucks of one manufacturer.

1.4 Changes in this test method may be necessary due to refinements in the procedure, obsolescence of parts, or reagents, and so forth. These changes will be incorporated by Information Letters issued by the ASTM Test Monitoring Center (TMC). The test method will be revised to show the content of all the letters, as issued.

1.5 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.

1.5.1 Exception—When materials, products, or equipment are available only in inch-pound units, SI units are omitted.

1.6 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.

1.7 This test method is arranged as follows:

Significance and Use

This test method is used to evaluate automotive manual transmission fluids for thermal instability, which results in deterioration of synchronizer performance.

This test method may also be utilized in other specifications and classifications of transmission and gear lubricants such as the following:

(final API designation of PG-1),

Military Specification MIL-L-2105,

SAE Information Report J308 Axle and Manual Transmission Lubricants, and

Mack Truck GO-H Gear Lubricant Specification.

Keywords

cyclic transmission test; forkwear; manual transmission lubricants; shifting synchronization; shift time; thermal stability; total cycle time; Calculating test values; Cyclic transmission test; Fork wear; Manual transmission lubricants; Performance--petroleum products/applications; Shifting synchronization; Shift time; Synchronizer performance; Thermal analysis (TA)--petroleum products; Thermal stability; Total cycle time; Transmission fluids; Validity; ICS Number Code 75.100 (Lubricants, industrial oils and related products)

To find similar documents by ASTM Volume:

05.02 (Petroleum Products and Lubricants (II): D3711 - D6122)

To find similar documents by classification:

75.100 (Lubricants, industrial oils and related products Including mineral oils, fluids for metal working and for temporary protection against corrosion Lubrication systems, see 21.260 Insulating oils, see 29.035.40)

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