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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. 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:

Section
Scope1
Referenced Documents2
Terminology3
Summary of Test Method4
Significance and Use5
Apparatus6
Test Transmission6.2
Transmission Mounts6.3
Oil Circulating System6.4
Oil Return Hole6.5
Air Pressure Controls6.6
Drive System6.7
Instrumentation6.8
Thermocouple Placement6.9
Reagents and Materials7
Safety8
Preparation of Apparatus9
Cleaning of Parts9.1
Assembly9.2
Calibration10
Transmission and Test Stand Calibration10.1
Reference Oils10.2
Reference Oil Test Frequency10.3
Instrumentation Calibration10.4
Shift Time Calibration10.5
Operating Procedure11
System Flush and Charge11.1
Test Operation11.2
Shut Down Procedure11.3
Transmission Disassembly 11.4
Determination of Test Results12
Failure Criteria12.1
Shifter Fork Wear12.2
Test Validity Determination12.3
Report13
Precision and Bias14
Keywords15
Test Validity Calculations and LimitsAnnex A1
Test Kit PartsAnnex A2
Report FormsAnnexA3
Data DictionaryAnnex A4
Manual Transmission Cyclic Durability Test Parts Inspection and Wear MeasurementsAnnex A5

Product Details

Published:
06/10/2001
Number of Pages:
26
File Size:
1 file , 630 KB