ISO INTERNATIONAL STANDARD 3965 Second edition 1990-02-15 Agricultural wheeled tractors ---- Maximum speeds --. Method of determination Tracteurs agricoles a roues -- Vitesses maximales -- Methode de determination Reference number ISO 3965:1990(E) No reproduction or networking permited without license from IHS Not for Resale ISO3965:1990(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies).The work of preparing International Standards is normally carried out through Iso technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmentai, in liaison with iso, also take part in the work. iso collaborates closely with the international Electrotechnical Commission (lEC) on all matters of electrotechnical standardization Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IsO Council. They are approved in member bodies voting. International Standard Iso 3965 was prepared by Technica! Committee isO/TC23,Tractorsandmachineryforagricultureandforestry This second edition cancels and replaces the first edition (ISO 3965 1977), of which it constitutes a minor revision, now incorporating a specimen test report. Annex A forms an integral part of this international Standard. CISO1990 All rights reserved. No part of this publication may be reproduced or utilized in any form permissioninwritingfromthepublisher. International Organization for Standardization Case Postale 56. CH-1211 Geneve 20· Switzerland Printed in Switzerland ii CopyrihtIntenatinal Oorganizatin for Standardization No reproduction or networking pemited without license from IHS Not or Resale ISO 3965:1990(E) INTERNATIONAL STANDARD Agricultural wheeled tractors -- Maximum speeds --- Method of determination Scope Maximum travel speed measurement This international Standard specifies a method for 4.1 Test requirements calculating the maximum design speed and method for measuring the maximum travel speed of agricultural wheeled tractors. 4.1.1 Tractor 4.1.1.1 The fuel specified in the operation manual 2Normative references shall be used. The following standards contain provisions which, 4.1.1.2 The settings for the carburettor and ignition through reference in this text,constitute provisions and/or the fuel injection pump, the engine power of this International Standard At the time of publi- and the no-load engine rotational frequency shall be cation, the editions indicated were valid All stand- as specified by the manufacturer. ardsaresubjectto revision, and parties to agreements based on this International Standard 4.1.1.3 Front-wheel drive or any additional (power) are encouraged to investigate the possibility of ap- driving axle shall only be engaged when recom- plying the most recent editions of the standards in- mended by the manufacturer for road use dicated below Members of IEC and ISO maintain registers of currently valid International Standards. 4.1.1.4 The tyres shall be of the same stated size as those used to calculate maximum design speed Iso 789-1.1981, Agricultural tractors --- Test proce- (clause 3) The tyres shall be new and inflated to the dures--Part1:Powertests pressure indicated by the tractor manufacturer for road use isO 4251-11988,Tyres and rims (existing series) for agricultural tractors and machines -- Part 1: Tyre 4.1.1.5 The tractor shall be in working order, with designation and dimensions fullfueltanks,radiators and withanoperator,but without removabie ballast weights, special equip- ment or ioads. 3 Maximum design speed calculation 4.1.2Test roadway Calcuiate the maximum design speed from parame ters as specified by the manufacturer, i.e. 4.1.2.1 The roadway shall be straight an