ISO INTERNATIONAL STANDARD 11512 First edition 1995-03-01 Machinery for forestry Tracked special machines - Performance criteria for brake systems Matérielforestier-MachinesspecifiguessurchenillesCriteresde performance des dispositifs de freinage ATTENTIONCUSTOMERS Copies of international standards, catalogs, and handbooks (ISoandIEC),aswellas ali foreign standards from Iso member body countries (DIN, JISC, BSI, AFNOR, etc.), are available in the U.S. from ANSl, 11 West 42nd Street, New York, NY 10036. Tel.(212)642-4900,Fax.(212)302-1286. ISO Reference number ISO 11512:1995(E) Coovriaht Intermational Ordanization for Standardization ISO 11512:1995(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work ofpreparingInternationalStandardsisnormalycarriedoutthroughsO technical committees. Each member body interested in a subject for whichatechnicalcommitteehasbeenestablishedhastherighttobe represented on that committee. International organizations, governmental 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 of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard isO 11512 was prepared by Technical Committee iso/Tc 23, Tractors and machinery for agriculture and forestry, Subcom- mitteeSC15,Machineryforforestry. ?1SO1995 All rights reserved. Unless otherwise specified, 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 OrganizationforStandardization CasePostale56CH-1211Geneve20·Switzerland Printed in Switzerland i INTERNATIONALSTANDARDISO ISO 11512:1995(E) Machinery for forestry Tracked special machines Performance criteria for brake systems Scope NOTE1Suchsystemsincludethecontrol(s),meansof brake actuation,the brake(s) and all parts connecting the braketothetrack. ThisInternationalStandardspecifiesperformancetest methods and criteria to enable uniform assessment 3.1.1 service brake system: Primary system used of the service,secondary and parking brake systems of tracked specially designed forestry machines. for stopping and holding the machine. This International Standard applies to self-propelled 3.1.2secondarybrakesystem:System used for tracked specialforestrymachinesdefined inIsO6814 stopping the machine in the event of any single failure with a maximum design speed, determined in ac- in the service brake system. cordance with Is0 6014, of 20 km/h or less. 3.1.3 parking brake system: System used to hold a stopped machine in a stationary position. 2 Normative references 3.2Brake system components The following standards contain provisions which, throughreferenceinthis text,constituteprovisions 3.2.1 control: Component directly activated by the of this international Standard. At the time of publi- operator to cause a force to be transmitted to the cation, the editions indicated were valid. All standards brake(s). are subject to revision, and parties to agreements basedonthisInternationalStandardareencouraged 3.2.2 brake actuation system: All of the com- to investigate the possibility of applying the most re- ponents between the control(s) and the brake(s) cent editions of the standards indicated below. which connect them functionally. Members of IEC and ISO maintain registers of cur- rently valid International Standards. 3.2.3 brake: Components which directly apply a Iso 6014:1986,Earth-moving machinery-Determi- force to oppose movement of the machine. nation of ground speed. NOTE2 The brakes may, for example, be of friction,