ISO INTERNATIONAL STANDARD 8643 Third edition 2017-02 Earth-moving machinery Hydraulic excavator and backhoe loader lowering control device Requirements and tests Engins de terrassement Dispositif de controle d'abaissement de la fleche des pelles et chargeuses-pelleteuses hydrauliques - Exigences et méthodes d'essai Reference number IS0 8643:2017(E) International Organization for Standardization @ IS0 2017 e=ZHEJIANG INST OF STANDARDIZATION C1 5956617 mitted without license from IHS IS0 8643:2017(E) COPYRIGHT PROTECTED DOCUMENT IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISOcopyrightoffice Ch. de Blandonnet 8 · CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Internatinir DrganizationforStandardization Licensee-ZHEJIANG INST OF STANDARDIZzRoISQ7 - All rights reserved Not for Resale, 2017/5/11 02:27:02 networking permited withoutlicense from IHS IS0 8643:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. 2 Normative references 3 Terms and definitions 4 Lowering control device requirements ..2 5 Test method. ..4 5.1 Apparatus. .4 5.2 Preparation for test ..4 5.3 Testing of lowering control device. .7 5.3.1 General. 5.3.2 Testing of internal leakage . .9 5.3.3 Testing of holding position ..9 5.3.4 Testing during raising. 9 5.3.5 Testing during lowering. ..9 5.3.6 Testing of equalizing lines or signal lines .9 Bibliography ..11 Inteainal oganzation @st(Sr2a747 - All rights reserved ii icensee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under Ise with ISC ed without license from IHS