Specification for Measurement of Linear Vibration on Gear Units
ANSI/AGMA 6000-C20
ANSI/AGMA 6000-C20


This standard presents a method for measuring steady state vibration of a gear unit. Types of instrumentation, measurement methods, and testing procedures for the determination of linear vibration levels for specific types of gear units are provided. Vibration limits at discrete frequencies are recommended for acceptance testing.

The recommended limits and conditions specified herein are intended as the vibration criteria for performance of the gear drive during the equipment manufacturer’s test when specifically agreed to by the manufacturer and purchaser.

This standard is specifically applicable to enclosed speed reducing or increasing gear drive units designed, rated, and lubricated in accordance with ANSI/AGMA product standards as indicated in 4.3.

This standard does not apply to integrated systems, shaft-mounted units, special or auxiliary drive trains or power take-off gears. Vibration amplitudes exceeding the recommendations of this specification for drives with flexible housings or on flexible supports may also be allowable if accounted for in the design. Acceptable limits for this type of equipment should be independently specified. However, if negotiated, this standard may be applied to such equipment.

Torsional and transient vibrations of a geared system are not included in this standard.

NOTE: Compliance with this standard does not constitute a warranty of the measured gear unit’s performance under installed field service conditions.


This standard presents a method for the measurement of linear vibrations on a gear unit. Instrumentation, measuring methods, test procedures and discrete frequency vibration limits are recommended for acceptance testing to confirm integrity. An annex which lists system effects on gear unit vibration and responsibility is also provided.


[The foreword, footnotes, and annexes, if any, in this document are provided for informational purposes only and are not to be construed as a part of ANSI/AGMA Standard 6000-C20, Specification for Measurement of Linear Vibration on Gear Units.]

ANSI/AGMA 6000-A88 included and superseded the information previously published in AGMA 426.01 (1972), Specification for Measurement of Lateral Vibration on High Speed Helical and Herringbone Gear Units.

Performance of driven equipment is dependent upon the individual characteristics of the prime mover, gear unit, driven machine and support structure, as well as their combined effects as a system. The proper assessment of performance characteristics is essential for realistic evaluation. The knowledge and judgment required to properly evaluate the gear unit vibration comes primarily from years of accumulated experience in designing, manufacturing, and operating gear units. For these reasons, the inexperienced are encouraged to seek assistance.

The complexity of gear vibration phenomena makes most vibration standards difficult to apply or to properly interpret. The AGMA Acoustical Technology Committee developed the Specification for Measurement of Linear Vibration on Gear Units to provide a common basis for communication between project engineers, gear manufacturers, and users. The purpose was, also, to encourage the maximum practical degree of uniformity and consistency among vibration measurement practices within the gear industry.

Because of the wide variation of gear driven systems and structural supports, ANSI/AGMA 6000-A88 identified certain areas where special considerations might be necessary and should be agreed upon between purchaser and gear manufacturer when discussing gear vibrations.

ANSI/AGMA 6000-A88 was approved as a standard by the AGMA membership in May 1988 and approved as an American National Standard on June 16, 1988.

ANSI/AGMA 6000-B96 is a revision of ANSI/AGMA 6000-A88. The revision includes clarification of application of the standard, changes to Annex A, and the addition of a new Annex C, from ISO 8579-2.

ANSI/AGMA 6000-C20 replaces ANSI/AGMA 6000-B96. It has been updated to reflect changes and advances in technology. Vibration limits are defined with mathematical functions for ease of implementation into the user’s software and reports. An example application of this standard has been added as Annex A. Annex A from the previous edition has been updated and moved to Annex D.

ANSI/AGMA 6000-C20 was approved as a standard by the AGMA membership in September 2020 and approved as an American National Standard on December 4, 2020. Suggestions for improvement of this standard will be welcome. They may be submitted to


The following documents contain provisions which, through reference in this text, constitute provisions of this American National Standard. At the time of publication, the editions indicated were valid. All documents are subject to revision, and parties to agreements based on this American National Standard are encouraged to investigate the possibility of applying the most recent editions of the documents indicated below.

AGMA 919-1-A14, Condition Monitoring and Diagnostics of Gear Units and Open Gears: Part 1 – Basics

ANSI/ASA S1.1-2013, Acoustical Terminology

ANSI/ASA S2.2-1959, Calibration of Shock and Vibration Pickups

ANSI/ASA S2.4-1976 Methods for Specifying the Characteristics of Auxiliary Analog Equipment for Shock and Vibration Measurements

ISO 1925:2001, Mechanical vibration – Balancing – Vocabulary

ISO 2041:2018, Mechanical vibration, shock and condition monitoring – Vocabulary

ISO 21940-2:2017, Mechanical vibration — Rotor balancing — Part 2: Vocabulary

ISO 2954:2012, Mechanical vibration of rotating and reciprocating machinery – Requirements for instruments for measuring vibration severity

ISO 5348:1998, Mechanical vibration and shock – Mechanical mounting of accelerometers

Pages: 27

ISBN: 978-1-64353-090-1

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