SIST ISO 8759-1:2020

Agricultural tractors - Front-mounted equipment - Part 1: Power take-off: Safety requirements and clearance zone around PTO

This document specifies safety requirements for, and clearance zones around, front-mounted power take-offs (PTO) on agricultural tractors.
NOTE 1 Further specifications for front-mounted power take-offs are given in ISO 8759-3.
It is not applicable to tractors which are designed to run in two directions, where either end can be considered to be the front or the rear.
NOTE 2 In this case, ISO 500 (all parts) apply.

Tracteurs agricoles - Équipement monté à l'avant

Le présent document spécifie des exigences de sécurité relatives aux prises de force montées à l'avant des tracteurs agricoles, ainsi que des zones de dégagement autour de ces prises de force.
NOTE 1 De plus amples spécifications concernant les prises de force montées à l'avant sont données dans l'ISO 8759‑3.
Il n'est pas applicable aux tracteurs conçus pour se déplacer dans deux directions et dont chacune des deux extrémités peut être indifféremment considérée comme l'extrémité avant ou l'extrémité arrière.
NOTE 2 Dans ce cas, l'ISO 500 (toutes les parties) s'appliquent.

Kmetijski traktorji - Spredaj nameščena oprema - 1. del: Priključna gred: varnostne zahteve in območje nihanja okoli PTO

General Information

• Status: Published
• Publication Date: 27-Sep-2020
• ICS: 65.060.10 - Agricultural tractors and trailed vehicles
• Technical Committee: IMKG - Machinery for agriculture and forestry
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 24-Sep-2020
• Due Date: 29-Nov-2020
• Completion Date: 28-Sep-2020
• Ref Project: ISO 8759-1:2018 - Agricultural tractors - Front-mounted equipment - Part 1: Power take-off: Safety requirements and clearance zone around PTO

Relations

• Revised: SIST ISO 8759-1:2015 - Agricultural wheeled tractors - Front-mounted equipment - Part 1: Power take-off and three- point linkage
• Effective Date: 04-Nov-2015

Overview

SIST ISO 8759-1:2020 is an international standard issued by the International Organization for Standardization (ISO) that addresses safety requirements and clearance zones for front-mounted power take-offs (PTOs) on agricultural tractors. This standard plays a critical role in defining protective measures that reduce risk of injury and ensure operational safety around the PTO, which is a pivotal component for powering front-mounted agricultural equipment.

Focused specifically on front-mounted PTOs, SIST ISO 8759-1:2020 excludes tractors designed for bidirectional operation (where either end can be front or rear), which are governed by the ISO 500 series. The standard reinforces safe tractor design, mandatory clearance dimensions, and protective shielding requirements, thereby helping manufacturers comply with internationally recognized safety practices.

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Key Topics

• Safety Requirements
  The standard mandates the provision of a PTO master shield supplied and fixed by the tractor manufacturer. This shield must cover the PTO while in operation, minimizing risk of contact with moving parts. Alternative safety devices like towing frames or front three-point hitches are permitted if they provide equivalent protection and respect established clearance zones.

• Clearance Zone Specifications
  ISO 8759-1 defines precise dimensional requirements for the clearance zone surrounding the PTO. Diagrams and tables provide measurements such as aperture sizes, angular clearances, and minimum clearances-ensuring that sufficient space is maintained to avoid hazardous proximity to rotating PTO components during operation or maintenance.

• PTO Master Shield Design
  The standard addresses material and design flexibility, allowing the PTO master shield to be flexible if it is not used as a step. Provisions for anchoring the restraining member of the PTO drive shaft guard are specified, and options for a fully enclosed master shield or additional non-rotating casings when the PTO is not in use are included.

• Applicability and Scope
  The document explicitly excludes tractors designed for reversible operation (covered by ISO 500), and refers users seeking further PTO design specifications to ISO 8759-3. Additionally, it details conditions where lower linkages may interfere with clearance zones, especially when in raised or parked positions.

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Applications

SIST ISO 8759-1:2020 is essential for:

• Agricultural Tractor Manufacturers
  Ensuring tractor design meets internationally accepted safety criteria for front-mounted PTOs, thereby reducing liability and enhancing operator protection.

• Equipment Designers and Engineers
  Developing front-mounted attachments that interface safely with tractor PTOs, using clearances and shield dimensions to influence product design.

• Safety Inspectors and Regulatory Authorities
  Verifying compliance with safety standards in agricultural machinery to prevent accidents linked to PTO entanglement or crushing hazards.

• Farm Operators and Maintenance Teams
  Understanding the safety measures and clearance zones that must be respected during equipment attachment, adjustment, and routine maintenance on tractors.

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Related Standards

• ISO 8759-3: Provides further specifications for front-mounted power take-offs, expanding on technical and design aspects beyond safety and clearance zones.

• ISO 500 (all parts): Governs rear-mounted power take-off types 1 through 4 and applies to tractors designed to operate bi-directionally.

• ISO 5673-2:2005: Specifies requirements for PTO drive shafts and positional clearances related to power take-off driveline components and power-input connections.

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By adhering to SIST ISO 8759-1:2020, the agricultural machinery industry promotes safer operational environments, ensures compatibility of front-mounted PTO-driven attachments, and minimizes risks associated with rotating power transmission components. This standard is a critical reference for maintaining front-mounted PTO safety, protective shielding, and minimum clearance zones in line with international best practices.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 8759-1
Third edition
2018-11
Agricultural tractors — Front-
mounted equipment —
Part 1:
Power take-off: Safety requirements
and clearance zone around PTO
Tracteurs agricoles — Équipement monté à l'avant —
Partie 1: Prise de force: Exigences de sécurité et zone de dégagement
autour de la prise de force
Reference number
©
ISO 2018
© ISO 2018
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]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative reference(s) . 1
3 Terms and definitions . 1
4 Safety requirements . 1
5 Clearance zone around PTO . 2
Bibliography . 5
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 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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture
and forestry, Subcommittee SC 4, Tractors.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
This third edition of ISO 8759-1, together with the first editions of ISO 8759-3 and ISO 8759-4, cancels
and replaces ISO 8759-1:1998, which has been technically revised. The main changes compared to the
previous edition are as follows:
— the content has been split into 3 parts:
— the general specifications of the power take-off and the location requirements have been moved
to a new part;
— the specifications of the three-point linkage have been moved to a new part;
— specifications for PTO type 4 have been added;
— the dim
...

SLOVENSKI STANDARD
01-november-2020
Kmetijski traktorji - Spredaj nameščena oprema - 1. del: Priključna gred: varnostne
zahteve in območje nihanja okoli PTO
Agricultural tractors - Front-mounted equipment - Part 1: Power take-off: Safety
requirements and clearance zone around PTO
Tracteurs agricoles - Équipement monté à l'avant
Ta slovenski standard je istoveten z: ISO 8759-1:2018
ICS:
65.060.10 Kmetijski traktorji in prikolice Agricultural tractors and
trailed vehicles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 8759-1
Third edition
2018-11
Agricultural tractors — Front-
mounted equipment —
Part 1:
Power take-off: Safety requirements
and clearance zone around PTO
Tracteurs agricoles — Équipement monté à l'avant —
Partie 1: Prise de force: Exigences de sécurité et zone de dégagement
autour de la prise de force
Reference number
©
ISO 2018
© ISO 2018
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]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative reference(s) . 1
3 Terms and definitions . 1
4 Safety requirements . 1
5 Clearance zone around PTO . 2
Bibliography . 5
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 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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture
and forestry, Subcommittee SC 4, Tractors.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
This third edition of ISO 8759-1, together with the first editions of ISO 8759-3
...

NORME ISO
INTERNATIONALE 8759-1
Troisième édition
2018-11
Tracteurs agricoles — Équipement
monté à l'avant —
Partie 1:
Prise de force: Exigences de sécurité et
zone de dégagement autour de la prise
de force
Agricultural tractors — Front-mounted equipment —
Part 1: Power take-off: Safety requirements and clearance zone
around PTO
Numéro de référence
©
ISO 2018
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2018
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]
Fax: [phone]
E-mail: [e-mail]
Web: www.iso.org
Publié en Suisse
ii © ISO 2018 – Tous droits réservés

Sommaire Page
Avant-propos .iv
1 Domaine d’application . 1
2 Références normatives . 1
3 Termes et definitions . 1
4 Exigences de sécurité . 1
5 Zone de dégagement autour de la prise de force . 2
Bibliographie . 5
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes
nationaux de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est
en général confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude
a le droit de faire partie du comité technique créé à cet effet. Les organisations internationales,
gouvernementales et non gouvernementales, en liaison avec l'ISO participent également aux travaux.
L'ISO collabore étroitement avec la Commission électrotechnique internationale (IEC) en ce qui
concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d'approbation requis pour les différents types de documents ISO. Le présent document a été
rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir www
.iso .org/directives).
L'attention est appelée sur le fait que certains des éléments du présent document peuvent faire l'objet de
droits de propriété intellectuelle ou de droits analogues. L'ISO ne saurait être tenue pour responsable
de ne pas avoir identifié de tels droits de propriété et averti de leur existence. Les détails concernant
les références aux droits de propriété intellectuelle ou autres droits analogues identifiés lors de
l'élaboration du document sont indiqués dans l'Introduction et/ou dans la liste des déclarations de
brevets reçues par l'ISO (voir www .iso .org/brevets).
Les appellations commerciales éventuellement mentionnées dans le présent document sont données
pour information, par souci de commodité, à l'intention des utilisateurs et ne sauraient constituer un
engagement.
Pour une explication de la nature volontaire des normes, la signification des termes et expressions
spécifiques de l'ISO liés à l'évaluation de la conformité, ou pour toute information au sujet de l'adhésion
de l'ISO aux principes de l’Organisation mondiale du commerce (OMC) concernant les obstacles
techniques au commerce (OTC), voir le lien suivant: www .iso .org/iso/foreword .html.
Le présent document a été élaboré par le Comité technique ISO/TC 23, Tracteurs et matériels agricoles et
forestiers, sous-comité SC 4, Tracteurs.
Il convient que l’utilisateur adresse tout retour d’information ou toute question concernant le présent
document à l’organisme national de normalisation de son pays. Une liste exhaustive desdits organismes
se trouve à l’adresse www .iso .org/members .html.
Cette troisième édition de l’ISO 8759-1, conjointement avec les premières éditions de l'ISO 8759-3 et
de l’ISO 8759-4, annule et remplace l’ISO 8759-1:1998, qui a fait l'objet d'une révision technique. Les
principales modifications apportées par rapport à l’édition précédente sont les suivantes:
— le contenu a été subdivisé en 3 parties:
— les spécifications générales relatives à la prise de force et les exigences générales relatives à
l’emplacement constituent désormais une nouvelle partie;
— les spécifications concernant l’attelage trois points forment une nouvelle partie;
— des spécifications ont été ajoutées pour le prise de force de type 4;
— les dimensions du bouclier protecteur du tracteur et de la zone de dégagement ont été mises à jour;
— les dimensions du dispositif de protection/du bouclier protecteur du tracteur et la zone de
dégagement sont représentés sur une même figure.
Une liste de toutes les parties de la série ISO 8759 peut être consultée sur le site de l’ISO.
iv © ISO 2018 – Tous droits réservés

NORME INTERNATIONALE ISO 8
...