ISO 8643:2024

Earth-moving machinery — Hydraulic excavator and backhoe loader lowering control device — Requirements and tests

This document establishes uniform requirements and test procedures for lowering control devices fitted on the boom, intermediate boom and arm cylinders of hydraulic excavators and backhoe loaders to control the rate of drop in the case of a hydraulic line failure or rupture. It is applicable to the lowering control devices of hydraulic excavators and the backhoe equipment of backhoe loaders used for object handling which are equipped with the standard linkage as defined by the manufacturer. On machines where alternative linkage combinations are offered, only the standard length defined by the manufacturer is subject to testing.

Engins de terrassement — Dispositif de contrôle d'abaissement de la flèche des pelles et chargeuses-pelleteuses hydrauliques — Exigences et méthodes d'essai

Le présent document établit des exigences uniformes et des modes opératoires d'essai pour les dispositifs de contrôle d’abaissement montés sur vérin de flèche ou de bras des pelles hydrauliques ou chargeuses pelleteuses pour contrôler le taux de chute en cas de défaillance ou de rupture du circuit hydraulique. Il s'applique aux dispositifs de contrôle d’abaissement des pelles hydrauliques et équipement rétro des chargeuses pelleteuses utilisés pour la manutention d’objets qui sont équipés d'une liaison standard telle que définie par le fabricant. Sur les engins ayant d'autres combinaisons de liaison proposées, seule la longueur standard définie par le fabricant est sujette à l'essai.

General Information

• Status: Published
• Publication Date: 07-May-2024
• ICS: 53.100 - Earth-moving machinery
• Technical Committee: ISO/TC 127/SC 1 - Test methods relating to safety and machine performance
• Drafting Committee: ISO/TC 127/SC 1 - Test methods relating to safety and machine performance
• Current Stage: 6060 - International Standard published
• Start Date: 08-May-2024
• Due Date: 10-Apr-2025
• Completion Date: 08-May-2024

Relations

• Revises: ISO 8643:2017 - Earth-moving machinery — Hydraulic excavator and backhoe loader lowering control device — Requirements and tests
• Effective Date: 28-Oct-2023

Standards Content (Sample)

International
Standard
ISO 8643
Fourth edition
Earth-moving machinery —
2024-05
Hydraulic excavator and backhoe
loader lowering control device —
Requirements and tests
Engins de terrassement — Dispositif de contrôle d'abaissement
de la flèche des pelles et chargeuses-pelleteuses hydrauliques —
Exigences et méthodes d'essai
Reference number
ISO 8643:2024(en) © ISO 2024

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ISO 8643:2024(en)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland

© ISO 2024 – All rights reserved
ii

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ISO 8643:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
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 .7
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 .10

© ISO 2024 – All rights reserved
iii

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ISO 8643:2024(en)
Foreword
ISO (the Inter
...

Norme
internationale
ISO 8643
Quatrième édition
Engins de terrassement — Dispositif
2024-05
de contrôle d'abaissement de la
flèche des pelles et chargeuses-
pelleteuses hydrauliques —
Exigences et méthodes d'essai
Earth-moving machinery — Hydraulic excavator and backhoe
loader lowering control device — Requirements and tests
Numéro de référence
ISO 8643:2024(fr) © ISO 2024

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ISO 8643:2024(fr)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2024
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: [phone]
E-mail: [e-mail]
Web: www.iso.org
Publié en Suisse

© ISO 2024 – Tous droits réservés
ii

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ISO 8643:2024(fr)
Sommaire Page
Avant-propos .iv
Introduction .v
1 Domaine d’application . 1
2 Références normatives . 1
3 Termes et définitions . 1
4 Exigences pour le dispositif de contrôle d'abaissement . 2
5 Mode opératoire . 4
5.1 Appareillage .4
5.2 Préparation pour l'essai .4
5.3 Essai du dispositif de contrôle d’abaissement .7
5.3.1 Généralités .7
5.3.2 Essai de fuite interne .9
5.3.3 Essai de maintien en position .9
5.3.4 Essai en mouvement de levage .9
5.3.5 Essai en mouvement de descente .9
5.3.6 Essai des lignes d'équilibrage ou des lignes de signal .10
Bibliographie .11

© ISO 2024 – Tous droits réservés
iii

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ISO 8643:2024(fr)
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux
de no
...

FINAL DRAFT
International
Standard
ISO/FDIS 8643
ISO/TC 127/SC 1
Earth-moving machinery —
Secretariat: BSI
Hydraulic excavator and backhoe
Voting begins on:
loader lowering control device —
2024-02-15
Requirements and tests
Voting terminates on:
2024-04-11
Engins de terrassement — Dispositif de contrôle d'abaissement
de la flèche des pelles et chargeuses-pelleteuses hydrauliques —
Exigences et méthodes d'essai
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 8643:2024(en) © ISO 2024

---------------------- Page: 1 ----------------------
FINAL DRAFT
ISO/FDIS 8643:2024(en)
International
Standard
ISO/FDIS 8643
ISO/TC 127/SC 1
Earth-moving machinery —
Secretariat: BSI
Hydraulic excavator and backhoe
Voting begins on:
loader lowering control device —
Requirements and tests
Voting terminates on:
Engins de terrassement — Dispositif de contrôle d'abaissement
de la flèche des pelles et chargeuses-pelleteuses hydrauliques —
Exigences et méthodes d'essai
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
COPYRIGHT PROTECTED DOCUMENT
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2024
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 8643:2024(en) © ISO 2024

© ISO 2024 – All rights reserved
ii

---------------------- Page: 2 ----------------------
ISO/FDIS 8643:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
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 .
...

ISO/FDIS 8643
ISO/TC 127/SC 1
Date: 2024-01-15
ISO 8643:2017
ISO/TC 127/SC 1
Secretariat: BSI
Date: 2024-01-31
Earth-moving machinery — Hydraulic excavator and backhoe loader
lowering control device — Requirements and tests
Engins de terrassement — Dispositif de contrôle d'abaissement de la flèche des pelles et chargeuses-pelleteuses
hydrauliques — Exigences et méthodes d'essai
FDIS stage

---------------------- Page: 1 ----------------------
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
E-mail: [e-mail]
Website: www.iso.org
Published in Switzerland

---------------------- Page: 2 ----------------------
ISO/FDIS 8643:2023(E2024(en)
Contents
Foreword . iv
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Lowering control device requirements . 3
5 Test method. 4
5.1 Apparatus . 4
5.2 Preparation for test . 5
5.3 Testing of lowering control device . 10
5.3.1 General . 10
5.3.2 Testing of internal leakage . 12
5.3.3 Testing of holding position. 12
5.3.4 Testing during raising . 12
5.3.5 Testing during lowering . 13
5.3.6 Testing of equalizing lines or signal lines . 13
Bibliography . 14

© ISO 2024 – All rights reserved

iii
© ISO 2023 – All rights reserved
iii

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ISO/FDIS 8643:2023(E2024(en)
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
...