(ISO 7464 International Standard INTE RNATIONAL ORGANIZATION FOR STANDARDIZATION+MEXAYHAPOAHAN OPTAHM3ALMA nO CTAHAAPTW3AMM+ORGANISATION INTE RNATIONALE DE NORMALISATION Earth-moving machinery - Method of test for the measurement of drawbar pull Engins de terrassement -- Methode d'essai pour le mesurage de la traction du timon First edition - 1983-05-15 UDC 621.878/.879 : 629.018 Ref. No. 1SO 7464-1983 (E) ISO 7464-1983 (E) Descriptors : earth-moving equipment, drawbars, tests, definitions. Price based on 8 pages Copyright Interational Organizatin for Standardization Not for Resale Foreword ISO (the Internationai Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of developing International interested in a subject for which a technical committee has been authorized has the and non-governmental, in liaison with Iso, also take part in the work. the member bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 7464 was developed by Technical Committee ISO/TC 127, Earth-moving machinery, and was circulated to the member bodies in December 1981. It has been approved by the member bodies of the following countries: Australia Germany, F.R. Spain Austria India Sweden Belgium Italy United Kingdom Brazil Mexico USA Bulgaria Poland USSR Romania Czechoslovakia Egypt, Arab Rep. of South Africa, Rep. of technical grounds : Japan International Organization for Standardization, 1983 Printed in Switzerland nited without license from IHS Not for Resale ISO 7464-1983 (E) INTERNATIONAL STANDARD Earth-moving machinery - Method of test for the measurement of drawbar pull Scope 1 3.8 test distance : The distance travelled by the test machine during the test time, expressed in metres (m). This International Standard specifies a test method to measure the drawbar pull performance of self-propelled earth-moving 3.9 wheel or track slip : The difference of drive wheel machinery and their combination with mounted or trailed revolutions (loaded) and drive wheel revolutions (unloaded) equipment, with or without payload. over the same distance and expressed as a percentage of the loaded revolutions. It covers the following criteria measured against travel speed : drawbar pull, drawbar power, and wheel or track slip. dynamometer car : A machine which can apply a con- trolled, sustained load to the machine under test. It shalt pro- 2 Field of application vide, as a minimum, instrumentation to measure drawbar pull, actual distance travelled, drive wheel revolutions, engine out- put shaft speed (r/min) and time of test runs. This International Standard applies to all types of self-propelled earth-moving machines except excavators. 3.11 machine mass : The mass of the machine as tested. It shall include the operator, a full tank of fuel, and allfluid com- 3 Definitions partments at their specified level; expressed in kilograms (kg). ses of this International Standard, the following Forthe purpose 3.12 tyre pressure : Air pressure in the machine tyres, as definitions apply : tested, expressed in kilopascals (kPa). 3.1 drawbar/hitch point : The part of the test machine 3.13 drive wheel revolutions : The number of revolutions used for the attachment of the dynamometer car. that the drive wheels or sprockets make for a specified test distance or time. 3.2 drawbar pull : The horizontal towing force exerted at the drawbar/hitch point, expressed in kilonewtons (kN). 3.14 ambient air temperature/relative humidity: Wet bulb and dry bulb readings which are recorded during the test, expressed in degrees Celsius (°C). 3.3 drawbar power : The towing power transmitted through the hitch point, expressed in kilowatts (kW). It is calculated as the product of travel speed, in metres per second barometric pressure: Measured during period of test, 3.15 (m/s) and drawbar pull, in kilonewtons (kN). expressed in kilopascals (kPa). 3.4 travel speed : The ac