NATIONAL FOREWORD

This Indian Standard (Part 1) (First Revision) which is identical with ISO 4392-1 : 2002 ‘Hydraulic fluid power - Determination of characteristics of motors - Part 1: At constant low speed and constant pressure’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Fluid Power Systems Sectional Committee and approval of the Production and General Engineering Division Council.

This standard was first published in 2000. This revision has been harmonized with ISO 4392-1 : 2002 by adoption to make pace with the latest developments that have taken place at international level.

In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure within an enclosed circuit. Hydraulic motors are units which transform hydraulic energy into mechanical energy, usually with a rotary output.

This Standard consists of the following parts under the general title ‘Hydraulic fluid power - Determination of characteristics of motors’:

Part 1 At constant low speed and at constant pressure

Part 2 Start ability

Part 3 At constant flow and at constant torque

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminology and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.