SAE J1430-2000 pdf download Retardation Capability of Off-Highway Dumpers and Scrapers
1. Scope—This SAE Standard applies to off-highway dumpers and scrapers equipped with an auxiliary retarder.
1 .1 Purpose
1.1.1To define test procedures for verifying that the machine will at least meet the manufacturer’s published continuous retarding capability curve.
1.1.2 To recommend a common format for reporting retardation pertormance.
2. References
2.1 Related Publications—The following publications are provided for information purposes only and are not a required part of this document.
2.1.1 SAE PuBUCATioN—Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.
SAE J1473—Braking Performance—Rubber-Tired Earthmoving Machines
2.1 .2 ISO PueucATio ► v—Available from ANSI, 1 1 West 42nd Street, New York, NY 1 0036-8002.
ISO 3450—Earth-moving machinery—Wheeled machines—Performance requirements and test procedures for braking systems
3. Definitions
3.1 Continuous Retarding Capability—The steady-state energy absorption rate at which the stated critical parameters of the machine’s retarding system are stabilized and are not exceeded.
NOTE—The critical parameters must be defined by the manufacturer. The critical parameters will depend upon the retarder system design.
3.2 An Auxiliary Retarder—An energy absorbing device normally used to control the speed of the machine while descending grades.
3.3 Maximum Continuous Power—The value describing the maximum descend speed and rimpull force which can be obtained without exceeding the manufacturer’s critical parameters.
4. Methods of Testing~atisfactory results from any one of the following methods will constitute verification of the published curve:
4.1 Towing
4.2 On-Grade
4.3 Dynamometer
5. Test Procedure
5.1 Facilities and Instrumentation
5.1.1 ? FACILITIES
5.1.1.1 Towing and On-Grade Test The test course shall consist of a hard, dry surface (ground moisture may be present to the extent that it does not adversely affect the braking surface) with a well compacted base. The course shall be of sufficient length, smoothness, and uniformity to assure maintaining required test speed. Additionally, when using the towing test, the average grade in the direction of travel must be within ±1 %.
5.1.1.2 Dynamometer Test—Driving equipment may consist of motors, monitoring dynamometers, or rolls which shall be used within their manufacturer’s stated range of limitations.
5.1 .2 INSTRUMENTATION
5.1.2.1 A means to measure and record these parameters within the specified accuracy:
5.2 Test Requirements
5.2.1 Test to be conducted with the retarding system fully serviced and adjusted to the manufacturer’s specifications.
5.2.2 Test to be conducted at normal operating temperatures.
5.2.3 If the auxiliary retarder uses common energy absorbing components with service and/or secondary brake system, the machine must continue to comply with the applicable SAE braking performance documents at the completion of the retarding test.
SAE J1430-2000 pdf download
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