ISO 5676:2023
(Main)Tractors and machinery for agriculture and forestry — Hydraulic coupling — Braking circuit
Tractors and machinery for agriculture and forestry — Hydraulic coupling — Braking circuit
This document specifies the conditions for interchangeability, and the operating characteristics and lays down the technical specifications for tests, for the hydraulic couplings on braking systems for towed agriculture and forestry machinery. This document applies solely to hydraulic brake couplings.
Tracteurs et matériels agricoles et forestiers — Coupleurs hydrauliques — Circuit de freinage
Le présent document spécifie les conditions d’interchangeabilité et les caractéristiques de fonctionnement des liaisons hydrauliques de freinage assisté des matériels agricoles et forestiers remorqués. Il fixe également les spécifications techniques pour les essais. Le présent document est applicable aux liaisons hydrauliques de freinage, uniquement.
General Information
- Status
- Published
- Publication Date
- 19-Jun-2023
- Technical Committee
- ISO/TC 23/SC 4 - Tractors
- Drafting Committee
- ISO/TC 23/SC 4/WG 14 - Revision of ISO 17567
- Current Stage
- 6060 - International Standard published
- Start Date
- 20-Jun-2023
- Due Date
- 05-May-2023
- Completion Date
- 20-Jun-2023
Relations
- Effective Date
- 23-Apr-2020
Overview
ISO 5676:2023 is the international standard detailing the specifications for hydraulic couplings used in braking systems of tractors and towed agricultural and forestry machinery. This second edition supersedes the 1983 version, updating technical requirements to reflect current industry practices.
The standard focuses exclusively on hydraulic brake couplings, ensuring their interchangeability, reliable operation, and safety under specified pressure and temperature conditions. Compliance with ISO 5676:2023 facilitates compatibility across diverse machinery brands and models, enabling efficient and safe connection and disconnection of hydraulic braking circuits.
Key Topics
Scope and Application
Defines requirements for hydraulic brake couplings in agricultural and forestry settings, specifically for towed machinery braking systems. Covers only hydraulic couplings affecting braking circuits.Dimensional Characteristics
Includes critical dimensions and configurations for male and female coupling parts to guarantee interchangeability and proper connection.Operating Conditions
- Service pressure range: 10 MPa to 15 MPa (100 to 150 bar), with a maximum service pressure of 15 MPa.
- Temperature range: -30 °C to 100 °C (with short peaks up to 140 °C for up to 1 hour).
- Connection/disconnection must ideally happen without pressure applied.
- Forces to connect/disconnect are specified to ensure ergonomic handling (less than 150 N for connection, less than 45 N for locking ring disconnection).
Technical Specifications and Testing
- Seals must be compatible with agricultural hydraulic oils and withstand specified operating conditions.
- Corrosion resistance is verified according to ISO 18869 standards.
- Hydraulic fluid tests (ISO VG 32 viscosity) at 22.5 MPa for 5 minutes ensure no leakage or permanent damage.
- Couplings are tested for oil loss and air intake following 100 coupling/uncoupling cycles, maintaining a maximum oil loss of 5 ml.
- Pressure loss during operation at rated flow and pressure is limited to 0.2 MPa.
Mounting Instructions
The male coupling half is installed facing backward on the tractor to maintain proper operation.
Applications
ISO 5676:2023 is essential for manufacturers, engineers, and maintenance professionals involved with:
- Design and production of towed agricultural and forestry machinery with hydraulic braking systems.
- Ensuring compatibility and safety of brake couplings across different tractor and implement combinations.
- Performing quality assurance tests on hydraulic brake couplings to prevent leaks, pressure loss, and mechanical failures.
- Supporting maintenance and inspection procedures for hydraulic braking circuits in the agricultural sector.
- Facilitating interoperability in global agricultural equipment markets by standardizing connection interfaces and operating parameters for hydraulic brake couplings.
Related Standards
- ISO 5675: Agricultural tractors and machinery - General purpose quick-action hydraulic couplers.
- ISO 18869:2017: Hydraulic fluid power - Test methods for couplings (corrosion resistance and performance testing).
- ISO 3448: Industrial liquid lubricants - ISO viscosity classification and viscosity testing.
These related documents provide complementary guidelines on hydraulic couplers and testing procedures critical to the effective implementation of ISO 5676:2023.
By adhering to ISO 5676:2023, stakeholders ensure hydraulic brake coupling systems used in tractors and towed agricultural or forestry machinery perform reliably, safely, and with consistent interchangeability, promoting operational efficiency and equipment longevity in the agricultural industry.
Buy Documents
ISO 5676:2023 - Tractors and machinery for agriculture and forestry — Hydraulic coupling — Braking circuit Released:20. 06. 2023
ISO 5676:2023 - Tracteurs et matériels agricoles et forestiers — Coupleurs hydrauliques — Circuit de freinage Released:7/20/2023
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Frequently Asked Questions
ISO 5676:2023 is a standard published by the International Organization for Standardization (ISO). Its full title is "Tractors and machinery for agriculture and forestry — Hydraulic coupling — Braking circuit". This standard covers: This document specifies the conditions for interchangeability, and the operating characteristics and lays down the technical specifications for tests, for the hydraulic couplings on braking systems for towed agriculture and forestry machinery. This document applies solely to hydraulic brake couplings.
This document specifies the conditions for interchangeability, and the operating characteristics and lays down the technical specifications for tests, for the hydraulic couplings on braking systems for towed agriculture and forestry machinery. This document applies solely to hydraulic brake couplings.
ISO 5676:2023 is classified under the following ICS (International Classification for Standards) categories: 65.060.01 - Agricultural machines and equipment in general. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 5676:2023 has the following relationships with other standards: It is inter standard links to ISO 5676:1983. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 5676:2023 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 5676
Second edition
2023-06
Tractors and machinery for
agriculture and forestry — Hydraulic
coupling — Braking circuit
Tracteurs et matériels agricoles et forestiers — Coupleurs
hydrauliques — Circuit de freinage
Reference number
© ISO 2023
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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Characteristics and specifications .1
4.1 General . 1
4.2 Dimensional characteristics . 1
4.3 Operating characteristics and technical specifications . 2
4.3.1 Operating characteristics . 2
4.3.2 Technical specifications . 3
5 Fixing of the male half of the coupling . 3
iii
Foreword
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This document was prepared by Technical Committ
...
NORME ISO
INTERNATIONALE 5676
Deuxième édition
2023-06
Tracteurs et matériels agricoles et
forestiers — Coupleurs hydrauliques
— Circuit de freinage
Tractors and machinery for agriculture and forestry — Hydraulic
coupling — Braking circuit
Numéro de référence
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2023
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.: +41 22 749 01 11
E-mail: copyright@iso.org
Web: www.iso.org
Publié en Suisse
ii
Sommaire Page
Avant-propos .iv
1 Domaine d’application . 1
2 Références normatives .1
3 Termes et définitions . 1
4 Caractéristiques et spécifications . 1
4.1 Généralités . 1
4.2 Caractéristiques dimensionnelles . 1
4.3 Caractéristiques de fonctionnement et spécifications techniques . 2
4.3.1 Caractéristiques de fonctionnement . 2
4.3.2 Spécifications techniques . 3
5 Fixation de la moitié mâle du coupleur . 3
iii
Avant-propos
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Le présent document a été élaboré par le comité technique ISO/TC 23, Tracteurs et matériels agricoles et
forestiers, sous-comité SC 4, Tracteurs.
Cette seconde édition annule et remplace la première édition (ISO 5676
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