ISO INTERNATIONAL STANDARD 6720 Second edition 1989-09-01 ANsI Inferrat Doc Sec! Agricultural machinery- Equipmentfor sowing, planting, distributing fertilizers and spraying - Recommended working widths Materiel agricole - Materiel de semis, de plantation, distributeurs d'engrais et pulverisateurs -- Largeurs de travail recommandees Reference number ISO6720:1989(E) ISO 6720 : 1989 (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 bodyinterested ina subjectforwhichatechnical committeehasbeenestablishedhas the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with Iso, also take part in the work. Iso collaborates closely with the International Electrotechnical Commission (IEC) on all matters ofelectrotechnicalstandardization. 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 accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 6720 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry. This second edition cancels and replaces the first edition (IS0 6720 : 1981), table 1 of which has been technically revised, to be in harmony with Iso 4004. @ISO1989 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56. CH-1211 Geneve 20. Switzerland Printed in Switzerland ISO 6720:1989 (E) INTERNATIONAL STANDARD Agricultural machinery - Equipment for sowing, planting, distributing fertilizers and spraying - Recommended working widths Scope aged to investigate the possibility of applying the most recent editions of the standard indicated below. Members of IEC and This International Standard specifies the working widths for ISo maintain registers of currently valid International Stan- equipment for sowing, planting, distributing fertilizers and dards. spraying, as a guideline for the manufacturers and users of IS0 4004 : 1983, Agricultural tractors and machinery - Track these machines. widths. It establishes a complementary relationship between the machines for sowing or planting (first operation) and the 3Working widths machinesforsubsequentoperations. Therecommendedworkingwidthsareshownintable1, The working widths indicated are based upon the track widths divided intothree groups,based ontractorwheel track widths specified in is0 4004. inaccordancewithis04004: a) group 1 is compatible with a track width of 1,5 m; 2Normative reference b) group 2 is compatible with a track width of 1,8 m; Thefollowing standard contains provisions which,through c) group 3 is compatible with a track width of 2 m. reference in this text, constitute provisions of this International Standard.At the time of publication,the edition indicated was Equipment for first operations which have a working width valid. All standards are subject to revision,andparties to greater than those given in the table shall satisfy subsequent agreements based on thisInternational Standard are encour- operationwidths.