SIST EN ISO 4254-12:2012

Agricultural machinery - Safety - Part 12: Rotary mowers and flail-mowers (ISO 4254-12:2012)

This part of ISO 4254, to be used together with ISO/FDIS 4254-1:2004, specifies safety requirements and their verification for the design and construction of rotary mowers and flail-mowers with one or several vertical axes or a horizontal axis, mounted, semi-mounted,trailed or self-propelled. In addition, this document specifies the type of information on safe working practices (including residual risks) to be provided by the manufacturer.

Landmaschinen - Sicherheit - Teil 12: Kreiselmähwerke und Schlegelmäher (ISO 4254-12:2012)

Dieser Teil von ISO 4254, sofern gemeinsam mit ISO 4254-1 angewendet, legt die sicherheitstechnischen Anforderungen und deren Überprüfung hinsichtlich der Gestaltung und konstruktiven Ausführung von Scheiben  und Trommelmähwerke (Kreiselmähwerke) für die Ernte von Futterpflanzen und für Schlegelmäher mit horizontaler Achse, die nur in der Landwirtschaft zum Einsatz kommen, die nur in der Landwirtschaft zum Einsatz kommen und die angebaut, aufgesattelt, gezogen oder selbstfahrend sind, fest. Sie beschreibt Maßnahmen zur Vermeidung oder Verminderung von Gefährdungen, die sich aus der bestimmungsgemäßen Verwendung und der vernünftigerweise vorhersehbaren Fehlanwendung dieser Maschinen im Rahmen des normalen Betriebes und der Wartung durch eine Person (Bedienungsperson) ergeben. Außerdem legt sie die Art von Informationen über sichere Arbeitsbedingungen fest, die vom Hersteller zur Verfügung zu stellen sind.
Enthalten sind Schlegelmäher mit horizontaler Achse, die lediglich zu Wartungszwecken auf der Rückseite geöffnet werden können.
Dieser Teil von ISO 4254 gilt auch für Mähwerke, die mit einer Aufbereitungseinrichtung ausgestattet sind.
Dieser Teil von ISO 4254 gilt nur für Mähwerke, die in Bodennähe arbeiten; Beispiele dafür sind A.1 zu entnehmen.
Wenn sich Anforderungen dieses Teils von ISO 4254 von denen unterscheiden, die in ISO 4254-1 festgelegt sind, haben die Anforderungen dieses Teils von ISO 4254 Vorrang gegenüber den Anforderungen von ISO 4254-1 für Maschinen, die nach den Anforderungen dieses Teils von ISO 4254 konzipiert und gebaut worden sind.
Dieser Teil von ISO 4254 zusammen mit ISO 4254 1 angewendet behandelt alle signifikanten Gefährdungen (wie in Tabelle 1 aufgelistet), Gefährdungssituationen und –ereignisse (mit der Ausnahme von Geräuschen und Schwingungen), die für Kreiselmähwerke und Schlegelmäher relevant sind, wenn sie bestimmungsgemäß und unter den Bedingungen der Fehlanwendung, die vom Hersteller vernünftigerweise vorhersehbar sind, angewendet werden (siehe Abschnitt 4).
Sie gilt nicht für (siehe Beispiele in A.2)
-   Schlegelmähwerke, deren hinterer Teil für bestimmte Feldarbeiten geöffnet werden kann;
-   Mähwerke mit Gelenkarm;
-   Mähwerke mit einer oder mehreren vertikalen Achsen, die zum Mulchen vorgesehen sind;
-   mitgängergeführte Motormäher;
-   Rasenmäher;
-   Zwischenreihenmäher;
-   Maschinen, die speziell für den Straßenbetriebsdienst ausgelegt sind.
Dieser Teil von ISO 4254 behandelt nicht Umweltgefährdungen, Straßenverkehrssicherheit und Gefährdungen im Zusammenhang mit bewegten Teilen der Kraftübertragung. Er behandelt nicht Gefährdungen hinsichtlich Wartung oder Reparaturen, die von professionellem Servicepersonal durchzuführen sind.
ANMERKUNG   Besondere Anforderungen in Bezug auf Straßenverkehrsvorschriften werden in diesem Teil von ISO 4254 nicht berücksichtigt.
Dieser Teil von ISO 4254 gilt nicht für Maschinen, die vor dem Datum der Veröffentlichung dieses Dokuments hergestellt wurden.

Matériel agricole - Sécurité - Partie 12: Faucheuses rotatives et faucheuses broyeuses (ISO 4254-12:2012)

L'ISO 4254-12:2012, destinée à être utilisée conjointement avec l'ISO 4254-1, spécifie les exigences de sécurité et leur vérification pour la conception et la construction de faucheuses rotatives à disques et de faucheuses rotatives à tambours, uniquement utilisées en agriculture pour la récolte de fourrage, ainsi que de faucheuses-broyeuses à axe horizontal pour l'agriculture, portées, semi-portées, traînées ou automotrices. Elle décrit des méthodes pour l'élimination ou la réduction de phénomènes dangereux inhérents à l'utilisation normale et à la mauvaise utilisation raisonnablement prévisible de ces machines par une personne (l'opérateur) durant le fonctionnement normal et l'entretien. En outre, elle spécifie le type d'informations que le fabricant doit donner sur les pratiques d'utilisation sûre.
Les faucheuses-broyeuses à axe horizontal pouvant être ouvertes à l'arrière uniquement pour la maintenance sont incluses dans le domaine d'application.
L'ISO 4254-12:2012, est également applicable aux faucheuses équipées d'un dispositif de conditionnement de fourrage et exclusivement applicable aux faucheuses destinées à travailler au niveau du sol.
L'ISO 4254-12:2012, utilisée conjointement avec l'ISO 4254-1, traite tous les phénomènes dangereux, situations et événements dangereux significatifs (à l'exception du bruit et des vibrations) inhérents à ces machines agricoles lorsqu'elles sont utilisées normalement et lorsqu'elles font l'objet d'un mauvais usage raisonnablement prévisible par le fabricant.
L'ISO 4254-12:2012 n'est pas applicable aux faucheuses-broyeuses à axe horizontal pouvant être ouvertes à l'arrière pour des usages particuliers dans les champs, aux faucheuses à bras articulés, aux faucheuses à un ou plusieurs axes verticaux, destinées au broyage, aux motofaucheuses à conducteur à pied, aux tondeuses à gazon, aux faucheuses interlignes, ni aux machines spécialement conçues pour l'entretien des autoroutes et des routes.

Kmetijski stroji - Varnost - 12. del: Rotacijske kosilnice in mulčerji (ISO 4254-12:2012)

Ta del standarda ISO 4254, ki se uporablja skupaj s standardom ISO/FDIS 4254-1:2004, določa varnostne zahteve in njihovo preverjanje za projektiranje ter konstrukcijo rotacijskih kosilnic in mulčerjev z eno ali več vertikalnimi osmi ali horizontalno osjo, nošenih, polnošenih, vlečnih ali z lastnim pogonom. Ta dokument določa tudi vrste informacij o varnih delovnih praksah (vključno z ostalimi tveganji), ki jih mora zagotoviti proizvajalec.

General Information

• Status: Published
• Public Enquiry End Date: 24-Mar-2008
• Publication Date: 16-Jul-2012
• ICS: 65.060.50 - Harvesting equipment
• Technical Committee: IMKG - Machinery for agriculture and forestry
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 04-Jul-2012
• Due Date: 08-Sep-2012
• Completion Date: 17-Jul-2012
• Directive: 2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
• Directive: 98/37/EC - Machinery
• Mandate: M/079 - Mandate to CEN and CENELEC for standardization in the field of machines
• Ref Project: EN ISO 4254-12:2012 - Agricultural machinery - Safety - Part 12: Rotary disc and drum mowers and flail mowers (ISO 4254-12:2012)

Relations

• Replaces: SIST EN 745:1999+A1:2009 - Agricultural machinery - Rotary mowers and flail-mowers - Safety
• Effective Date: 01-Sep-2012
• Amended By: SIST EN ISO 4254-12:2012/A1:2017 - Agricultural machinery - Safety - Part 12: Rotary disc and drum mowers and flail mowers (ISO 4254-12:2012/Amd 1:2017)
• Effective Date: 01-Mar-2016

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 4254-12:2012
01-september-2012
1DGRPHãþD
SIST EN 745:1999+A1:2009
.PHWLMVNLVWURML9DUQRVWGHO5RWDFLMVNHNRVLOQLFHLQPXOþHUML,62

Agricultural machinery - Safety - Part 12: Rotary mowers and flail-mowers (ISO 4254-
12:2012)
Landmaschinen - Sicherheit - Teil 12: Kreiselmähwerke und Schlegelmäher (ISO 4254-
12:2012)
Matériel agricole - Sécurité - Partie 12: Faucheuses rotatives et faucheuses broyeuses
(ISO 4254-12:2012)
Ta slovenski standard je istoveten z: EN ISO 4254-12:2012
ICS:
65.060.50 Oprema za spravilo pridelkov Harvesting equipment
SIST EN ISO 4254-12:2012 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 4254-12:2012

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SIST EN ISO 4254-12:2012


EUROPEAN STANDARD
EN ISO 4254-12

NORME EUROPÉENNE

EUROPÄISCHE NORM
June 2012
ICS 65.060.50 Supersedes EN 745:1999+A1:2009
English Version
Agricultural machinery - Safety - Part 12: Rotary disc and drum
mowers and flail mowers (ISO 4254-12:2012)
Matériel agricole - Sécurité - Partie 12: Faucheuses Landmaschinen - Sicherheit - Teil 12: Kreiselmähwerke
rotatives à disques, faucheuses rotatives à tambours et und Schlegelmäher (ISO 4254-12:2012)
faucheuses-broyeuses (ISO 4254-12:2012)
This European Standard was approved by CEN on 23 June 2012.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4254-12:2012: E
worldwide for CEN national Members.

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SIST EN ISO 4254-12:2012
EN ISO 4254-12:2012 (E)
Contents Page
Foreword .3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC .4

2

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SIST EN ISO 4254-12:2012
EN ISO 4254-12:2012 (E)
Foreword
This document (EN ISO 4254-12:2012) has been prepared by Technical Committee ISO/TC 23 "Tractors and
machinery for agriculture and forestry" in collaboration with Technical Committee CEN/TC 144 “Tractors and
machinery for agriculture and forestry” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by December 2012, and conflicting national standards shall be withdrawn
at the latest by December 2012.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 745:1999+A1:2009.
It is intended to be used together with EN ISO 4254-1:2009 "Agricultural machinery - Safety - Part 1: General
requirements (ISO 4254-1:2008)" and EN 15811:2009 "Agricultural machinery - Guards for moving parts of
power transmission - Guard opening with tool (ISO/TS 28923:2007 modified)".
This second edition cancels and replaces the first edition (EN 745:1999+A1:2009), which has been technically
revised.
The following major changes were introduced:
 requirements related to the scope and an enlargement to include rotary disc mowers, rotary drum mowers
and flail mowers with a horizontal axis;
 requirements related to the protection against inadvertent contact with the cutting elements, with new and
additional test criteria;
 requirements related to thrown object tests, with inclusion of two new parts to a revised standard
(ISO 17101), have been introduced with increased criteria for rotary and flail mower machines.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 4254-12:2012 has been approved by CEN as a EN ISO 4254-12:2012 without any
modification.

3

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SIST EN ISO 4254-12:2012
EN ISO 4254-12:2012 (E)
Annex ZA
(informative)

Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC
This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association to provide a means of conforming to Essential Requirements of the
New Approach Directive 2006/42/EC on machinery.
Once this standard is cited in the Official Journal of the European Union under that Directive and has been
implemented as a national standard in at least one Member State, compliance with the normative clauses of
this standard confers, within the limits of the scope of this standard, a presumption of conformity with the
relevant Essential Requirements, except Essential Requirement(s) for all machines: 1.1.7, 1.2.1, 1.3.2,
1.3.8.1, 1.4.2.1 (2nd paragraph), 1.7.4.2 u), 3.3.1, and additionally for self-propelled machines: 1.1.4, 1.1.8,
1.5.5, 1.5.9, 3.3.2, 3.3.3, 3.4.3, 3.6.3.1 of that Directive and associated EFTA regulations.
WARNING Other requirements and other EU Directives may be applicable to the product(s) falling
within the scope of this standard.


4

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SIST EN ISO 4254-12:2012

INTERNATIONAL ISO
STANDARD 4254-12
First edition
2012-06-15


Agricultural machinery — Safety —
Part 12:
Rotary disc and drum mowers and flail
mowers
Matériel agricole — Sécurité —
Partie 12: Faucheuses rotatives à disques, faucheuses rotatives à
tambours et faucheuses-broyeuses




Reference number
ISO 4254-12:2012(E)
©
ISO 2012

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SIST EN ISO 4254-12:2012
ISO 4254-12:2012(E)

COPYRIGHT PROTECTED DOCUMENT


©  ISO 2012
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 either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56  CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland

ii © ISO 2012 – All rights reserved

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SIST EN ISO 4254-12:2012
ISO 4254-12:2012(E)
Contents Page
Foreword . iv
Introduction . v
1  Scope . 1
2  Normative references . 2
3  Terms and definitions . 2
4  List of significant hazards . 3
5  Safety requirements and/or protective measures . 5
5.1  General . 5
5.2  Protection against inadvertent contact with the cutting elements . 5
5.3  Protection against thrown objects that are not part of the machine . 13
5.4  Protection during handling and transport . 13
5.5  Additional safety requirements for conditioning devices as an attachment or an integral
part of the rotary disc or drum mower . 13
5.6  Controls for adjustments . 19
5.7  Blades . 19
5.8  Overrunning clutch or freewheel device . 19
5.9  Implement hitch or carrier frame . 19
6  Verification of safety requirements and/or protective measures . 19
6.1  General . 19
6.2  Thrown object test . 19
6.3  Protective skirts test . 20
7  Information for use . 20
7.1  Operator's manual . 20
7.2  Marking . 21
Annex A (informative) Illustrations of mowers . 22
Bibliography . 28

© ISO 2012 – All rights reserved iii

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SIST EN ISO 4254-12:2012
ISO 4254-12:2012(E)
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. 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.
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.
ISO 4254-12 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and
forestry, Subcommittee SC 7, Equipment for harvesting and conservation.
ISO 4254 consists of the following parts, under the general title Agricultural machinery — Safety:
1)
 Part 1: General requirements
 Part 5: Power-driven soil-working machines
 Part 6: Sprayers and liquid fertilizer distributors
 Part 7: Combine harvesters, forage harvesters and cotton harvesters
 Part 8: Solid fertilizer distributors
 Part 9: Seed drills
 Part 10: Rotary tedders and rakes
 Part 11: Pick-up balers
 Part 12: Rotary disc and drum mowers and flail mowers
2)
 Part 13: Large rotary mowers
The following part is under preparation:
 Part 14: Mounted, semi-mounted and trailed bale wrappers
Part 2, Anhydrous ammonia applicators, has been withdrawn; Part 3, Tractors, has been cancelled and is
replaced by ISO 26322 (all parts), Tractors for agriculture and forestry — Safety; and Part 4, Forestry
winches, has been cancelled and replaced by ISO 19472, Machinery for forestry — Winches — Dimensions,
performance and safety.

1) For the purposes of global relevance, the requirements related to the guarding of moving parts for power transmission
have been transferred and published as two separate Technical Specifications: ISO/TS 28923:2007 (Guard opening with
tool) and ISO/TS 28924:2007 (Guard opening without tool).
2) To be published.
iv © ISO 2012 – All rights reserved

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SIST EN ISO 4254-12:2012
ISO 4254-12:2012(E)
Introduction
The structure of safety standards in the field of machinery is as follows.
a) Type-A standards (basic standards) giving basic concepts, principles for design, and general aspects that
can be applied to machinery.
b) Type-B standards (generic safety standards) dealing with one or more safety aspect(s) or one or more
type(s) of safeguards that can be used across a wide range of machinery:
 type-B1 standards on particular safety aspects (e.g. safety distances, surface temperature, noise);
 type-B2 standards on safeguards (e.g. two-hand controls, interlocking devices, pressure sensitive
devices, guards);
c) Type-C standards (machinery safety standards) dealing with detailed safety requirements for a particular
machine or group of machines.
This document is a type-C standard as stated in ISO 12100.
The machinery concerned and the extent to which hazards, hazardous situations and events are covered are
indicated in the Scope of this part of ISO 4254. These hazards are specific to rotary disc mowers, rotary drum
mowers, as used for forage crop harvesting in agriculture only, and flail mowers with horizontal axis for
agriculture only, that are mounted, semi-mounted, trailed or self-propelled.
Significant hazards that are common to all the agricultural machines (self-propelled ride-on, mounted, semi-
mounted and trailed) are dealt with in ISO 4254-1.
When requirements of this type-C standard are different from those which are stated in type-A or type-B
standards, the requirements of this type-C standard take precedence over the requirements of the other
standards for machines that have been designed and built according to the provisions of this type-C standard.
© ISO 2012 – All rights reserved v

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SIST EN ISO 4254-12:2012

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SIST EN ISO 4254-12:2012
INTERNATIONAL STANDARD ISO 4254-12:2012(E)

Agricultural machinery — Safety —
Part 12:
Rotary disc and drum mowers and flail mowers
1 Scope
This part of ISO 4254, where used with ISO 4254-1, specifies the safety requirements and their verification for
the design and construction of rotary disc mowers, rotary drum mowers, as used for forage crop harvesting in
agriculture only, and flail mowers with a horizontal axis for use in agriculture only, that are mounted, semi-
mounted, trailed or self-propelled. It describes methods for the elimination or reduction of hazards arising from
the intended use and reasonably foreseeable misuse of these machines by one person (the operator) in the
course of normal operation and service. In addition, it specifies the type of information on safe working
practices to be provided by the manufacturer.
Flail mowers with a horizontal axis that can be opened at the rear only for maintenance reasons are included.
This part of ISO 4254 is also applicable to mowers equipped with a conditioning device.
This part of ISO 4254 is applicable only to mowers intended to work at ground level, examples of which are
given in A.1.
When requirements of this part of ISO 4254 are different from those which are stated in ISO 4254-1, the
requirements of this part of ISO 4254 take precedence over the requirements of ISO 4254-1 for machines that
have been designed and built according to the requirements of this part of ISO 4254.
This part of ISO 4254, taken together with ISO 4254-1, deals with all the significant hazards (as listed in
Table 1), hazardous situations and events (with the exception of noise and vibrations) relevant to rotary disc
mowers, rotary drum mowers and flail mowers, when they are used as intended and under the conditions of
misuse that are reasonably foreseeable by the manufacturer (see Clause 4).
It is not applicable to (see examples in A.2)
 flail mowers that have the rear part which can be opened for particular field use operations,
 mowers with an articulated arm,
 mowers with one or more vertical axes designed for mulching,
 pedestrian-controlled motor mowers,
 lawn mowers,
 inter-row mowing units, or
 machines specifically designed for highway and road maintenance.
This part of ISO 4254 does not deal with environmental hazards, road safety and hazards related to moving
parts for power transmission. It does not deal with hazards related to maintenance or repairs to be carried out
by professional service personnel.
© ISO 2012 – All rights reserved 1

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SIST EN ISO 4254-12:2012
ISO 4254-12:2012(E)
NOTE Specific requirements related to road traffic regulations are not taken into account in this part of ISO 4254.
This part of ISO 4254 is not applicable to machines manufactured before the date of its publication.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 3600:1996, Tractors, machinery for agriculture and forestry, powered lawn and garden equipment —
Operator's manuals — Content and presentation
ISO 4254-1:2008, Agricultural machinery — Safety — Part 1: General requirements
ISO 5718:2002, Harvesting equipment — Blades for agricultural rotary mowers — Requirements
ISO 11684:1995, Tractors, machinery for agricultural and forestry, powered lawn and garden equipment —
Safety signs and hazard pictorials — General principles
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13857:2008, Safety of machinery — Safety distances to prevent hazard zones being reached by upper
and lower limbs
ISO 14982:1998, Agricultural and forestry machinery — Electromagnetic compatibility — Test methods and
acceptance criteria
3 )
ISO 17101-1:— , Agricultural machinery — Thrown-object test and acceptance criteria — Part 1: Rotary
mowers
3)
ISO 17101-2:— , Agricultural machinery — Thrown-object test and acceptance criteria — Part 2: Flail mowers
ISO 17103:2009, Agricultural machinery — Rotary disc mowers, rotary drum mowers and flail mowers — Test
methods and acceptance criteria for protective skirts
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12100 and ISO 4254-1 and the
following apply.
NOTE For illustrations of mowers and components, see A.1.
3.1
rotary mower
mower in which one or more functional components cut or shear forage crop by impact without mulching and
rotate about a vertical axis
3.1.1
rotary disc mower
rotary mower (3.1) where the drive line is below the path of the cutting elements

3) To be published. (Revision of ISO 17101:2004)
2 © ISO 2012 – All rights reserved

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SIST EN ISO 4254-12:2012
ISO 4254-12:2012(E)
3.1.2
drum mower
rotary mower (3.1) where the drive line is above the path of the cutting elements
3.1.3
cutting height
disc and drum mowers distance from the ground to the active cutting edge of the cutting element when the
cutting element is in the forward-most position of rotation
3.2
flail mower
mower with a multiplicity of free-swinging cutting elements that rotate about a horizontal axis, which cuts the
crop by impact and mulches it with the same working elements
3.3
conditioning device
mechanical device allowing the acceleration of the crop-drying process
NOTE Examples of acceleration of the crop-drying process are crushing, impact, abrasion and lamination.
3.3.1
roll type conditioner
conditioning device (3.3) that enhances the crop-drying process by passing crop material between, at least,
two rollers
3.3.2
impeller type conditioner
conditioning device (3.3) that enhances the crop-drying process by utilizing tines or spokes to scrub off the
wax coating from the crop or bend the stems
3.4
mulching
operation intended to chop the crop and leave the material on the ground to naturally decompose
3.5
protective skirt
skirt used on the machine to provide protection from thrown objects
4 List of significant hazards
Table 1 specifies the significant hazards, the significant hazardous situations and significant hazardous
event(s) covered by this part of ISO 4254, that have been identified by risk assessment as being relevant to
this type of machine, and which require specific action by the designer or manufacturer to eliminate or to
reduce the risk.
Attention is drawn to the necessity to verify that the safety requirements specified in this part of ISO 4254
apply to each significant hazard presented by a given machine and to validate that the risk assessment is
complete.
© ISO 2012 – All rights reserved 3

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SIST EN ISO 4254-12:2012
ISO 4254-12:2012(E)
Table 1 — List of significant hazards associated with rotary disc mowers, rotary drum mowers and
flail mowers
Hazardous situation Clause/subclause of Clause/subclause of
a
Hazard
No.
and event ISO 4254-1:2008 this part of ISO 4254
A.1 Mechanical hazards
A.1.1 Crushing Persons in danger 4.4.3; 4.5.1.1.2; 4.5.1.2.5; 5.1; 5.4; 5.5; 5.6; 7.1;
zone; 4.5.2; 4.5.2.2; 4.6; 4.7; 4.8; 7.2
4.14.1; 4.14.3; 4.14.5; 4.14.6;
Coupling area of
5.1.2.3; 5.1.3.2; 5.1.4; 5.1.8;
machines
5.2; 6.1; 6.2; 6.2.2; 6.2.3; 6.3;
6.4
A.1.2 Shearing Operating area of 4.4.3; 4.5.1.1.2; 4.5.1.2.5; 5.1; 5.2; 5.5; 5.6; 5.7;
rotating/oscillating tools; 4.5.2; 4.5.2.2; 4.6; 4.7; 4.8; 7.1; 7.2
4.14.1; 4.14.3; 4.14.5; 4.14.6;
Moving elements;
5.1.2.3; 5.1.3.2; 5.1.4; 5.1.8;
5.2; 6.1; 6.2; 6.2.2; 6.2.3; 6.3;
Slewing area of
6.4
machines and machine
parts
A.1.3 Cutting or severing Operating area of 4.7 5.2; 5.3; 5.5; 5.6; 5.7;
cutting machinery 5.8; 5.9
A.1.4 Entanglement Operating area of 4.7; 5.1.8; 6.4 5.1; 5.2; 5.5; 5.6; 7.1
rotating machinery;
Rotating or oscillating
machine parts
A.1.5 Drawing-in or trapping Operating area of 4.7; 5.1.8; 6.4 5.4; 5.5; 5.8; 5.9; 7.1;
rotating machinery; 7.2
Rotary or oscillating
machine parts
A.1.6 Impact Operating area of 4.5.1.2.5; 4.14.5; 4.14.6; 5.2; 5.3; 5.4; 5.5; 5.6;
rotating machinery; 5.1.3.1 7.1; 7.2
A.1.10 Ejection of parts 4.7; 4.8 5.3; 5.5; 5.7; 7.1; 7.2
A.6 Hazards generated by neglecting ergonomic principles in machinery design
A.6.1 Unhealthy postures or Manual control of the 4.4; 4.4.5; 4.5; 4.6; 4.14.2; 5.4; 6.1
excessive efforts machine 4.14.4; 5.1.1; 5.1.2.1; 5.1.3;
5.1.5.2
A.6.6 Human error Operating area of the 4.4; 8.1; 8.2 7.1; 7.2
machines
A.8 Unexpected start-up, unexpected overrun/overspeed
A.8.1 Failure/disorder of the 4.4; 6.1 –
control system
A.11 Failure of power Operating area of the 4.8; 4.8.2; 4.9; 5.1.8; 6.1.1; 5.4; 5.5; 5.6
supply machines; 6.5
Starting and stopping 4.4; 5.1.8; 6.1
devices
A.13 Errors of fitting 6.2; 6.3; 8.1; 8.1.3; 8.2 7.1
A.13.1 All kinds of guard 4.7 5.1; 5.5; 5.6; 7.1; 7.2
A.13.2 All kinds of safety- 4.7; 4.14.5; 4.14.6; 5.1.2.3; 5.1; 5.5; 5.6; 7.1; 7.2
related (protection) 6.4
devices
A.13.3 Safety signs and signals 8.2 7.1; 7.3
4 © ISO 2012 – All rights reserved

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SIST EN ISO 4254-12:2012
ISO 4254-12:2012(E)
Table 1 (continued)
Hazardous situation Clause/subclause of Clause/subclause of
a
No. Hazard
and event ISO 4254-1:2008 this part of ISO 4254
A.13.4 Essential equipment 4.8; 4.14 7.1; 7.2
and accessories for
safe adjusting and
maintenance
A.16 Loss of stability Prohibited 5.1.2.3; 6.2 7.1
combinations;
Supporting equipment
A.16.1 Hazards due to sudden 5.1.2.3; 6.2 5.1, 5.4, 5.5, 7.1, 7.2
movement, instability,
etc.
A.23 From/to third persons
A.23.3 Hazards to exposed 5.1.2.3; 5.1.8; 6.2 5.4; 5.5; 5.8; 7.1; 7.2
persons due to
uncontrolled movement
a
With reference to ISO 4254-1:2008, Table A.1.

5 Safety requirements and/or protective measures
5.1 General
5.1.1 Machinery shall comply with the safety requirements and/or protective measures of this clause. In
addition, the machine shall be designed according to the principles of ISO 12100 for hazards relevant but not
significant, which are not dealt with by this part of ISO 4254. The instruction handbook to be provided with the
machine shall comply with 7.1. The machine shall also be marked and carry safety signs according to 7.2
5.1.2 Except where otherwise specified in this part of ISO 4254, the machine shall comply with the
requirements of ISO 4254-1 and with Tables 1, 3, 4 and 6 of ISO 13857:2008 as appropriate.
5.1.3 Machinery shall comply with ISO 14982 for evaluating the electromagnetic compatibility.
5.2 Protection against inadvertent contact with the cutting elements
5.2.1 General
The mower shall be designed or guarded in such a way that inadvertent contact during normal operation with
the cutting elements from the front, and at the rear, the sides and the top is prevented.
5.2.1.1 Rotary disc mowers and rotary drum mowers
Contact with the cutting elements from the top shall be prevented by an imperforate guard or by the device
used to prevent thrown objects (see 5.3), providing it maintains at least an equivalent level of protection .
At any location along the cutting element path that is not either a crop inlet or a crop discharge area, typically
the sides and a portion of the rear, the protection shall be achieved by either one or both of the following:
a) a barrier located in such a way that the distances defined in Figure 1 and Figure 2 are respected. These
distances are measured from the cutting element path and with the mower in working position, the cutting
height, h, being adjusted at 50 mm or as near as possible to 50 mm.
© ISO 2012 – All rights reserved 5

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SIST EN ISO 4254-12:2012
ISO 4254-12:2012(E)
NOTE 1 See Figure 2 (Detail A) for the correct method of measuring the cutting height.
This barrier can be movable (e.g. removable, foldable) for transport or maintenance purposes. The
removal of the barrier shall only be possible by the use of a tool. Movable barriers shall be kept in the
fixed wo
...

SLOVENSKI STANDARD
oSIST prEN ISO 4254-12:2008
01-marec-2008
.PHWLMVNLVWURML9DUQRVWGHO5RWDFLMVNHNRVLOQLFHLQPXOþHUML,62',6

Agricultural machinery - Safety - Part 12: Rotary mowers and flail-mowers (ISO/DIS 4254
-12:2007)
Matériel agricole - Sécurité - Partie 12: Faucheuses rotatives et faucheuses broyeuses
(ISO/DIS 4254-12:2007)
Ta slovenski standard je istoveten z: prEN ISO 4254-12
ICS:
65.060.50
oSIST prEN ISO 4254-12:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
EUROPEAN STANDARD
DRAFT
prEN ISO 4254-12
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2007
ICS 65.060.50 Will supersede EN 745:1999
English Version
Agricultural machinery - Safety - Part 12: Rotary mowers and
flail-mowers (ISO/DIS 4254-12:2007)
Matériel agricole - Sécurité - Partie 12: Faucheuses
rotatives et faucheuses broyeuses (ISO/DIS 4254-12:2007)
This draft European Standard is submitted to CEN members for parallel enquiry. It has been drawn up by the Technical Committee
CEN/TC 144.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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 supporting documentation.
: This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
Warning
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN ISO 4254-12:2007: E
worldwide for CEN national Members.

---------------------- Page: 2 ----------------------
prEN ISO 4254-12:2007 (E)
Contents Page
Foreword.3

2

---------------------- Page: 3 ----------------------
prEN ISO 4254-12:2007 (E)
Foreword
This document (prEN ISO 4254-12:2007) has been prepared by Technical Committee ISO/TC 23 "Tractors
and machinery for agriculture and forestry" in collaboration with Technical Committee CEN/TC 144 “Tractors
and machinery for agriculture and forestry” the secretariat of which is held by AFNOR.
This document is currently submitted to the parallel Enquiry.
This document will supersede EN 745:1999.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EC Directive(s).
Endorsement notice
The text of ISO/DIS 4254-12:2007 has been approved by CEN as a prEN ISO 4254-12:2007 without any
modification.

3

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DRAFT INTERNATIONAL STANDARD ISO/DIS 4254-12
ISO/TC 23/SC 7 Secretariat: UNI
Voting begins on: Voting terminates on:
2007-12-20 2008-05-20
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
Agricultural machinery — Safety —
Part 12:
Rotary mowers and flail-mowers
Matériel agricole — Sécurité —
Partie 12: Faucheuses rotatives et faucheuses broyeuses
ICS 65.060.50

ISO/CEN PARALLEL ENQUIRY
The CEN Secretary-General has advised the ISO Secretary-General that this ISO/DIS covers a subject
of interest to European standardization. In accordance with the ISO-lead mode of collaboration as
defined in the Vienna Agreement, consultation on this ISO/DIS has the same effect for CEN
members as would a CEN enquiry on a draft European Standard. Should this draft be accepted, a
final draft, established on the basis of comments received, will be submitted to a parallel two-month FDIS
vote in ISO and formal vote in CEN.
To expedite distribution, this document is circulated as received from the committee secretariat.
ISO Central Secretariat work of editing and text composition will be undertaken at publication
stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
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 SUPPORTING DOCUMENTATION.
©
International Organization for Standardization, 2007

---------------------- Page: 5 ----------------------
ISO/DIS 4254-12
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©
ii ISO 2007 – All rights reserved

---------------------- Page: 6 ----------------------
ISO/DIS 4254-12
Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.2
3 Definitions .2
4 List of significant hazards .3
5 Safety requirements and/or protective measures.6
5.1 General .6
5.2 Protection against inadvertent contact with the cutting elements .6
5.2.1 General .6
5.2.2 Derogation (Special allowance) for offset mowers with one or several vertical axes
attached at the rear three-point tractor linkage (see Figure 5).12
5.3 Protection against thrown objects other than parts of the machine .13
5.3.1 General .13
5.4 Protection during handling and transport .14
5.5 Additional safety requirements for conditioners as an attachment and/or an integral part
of the rotary disc or drum mower.14
5.5.1 Conditioner attachments .14
5.5.2 Rotary disc or drum mower with integral conditioner.18
5.6 Controls for adjustments.21
5.7 Blades.21
5.8 Overrunning clutch .21
5.9 Implement hitch and/or carrier frame.21
6 Verification of safety requirements and/or measures .21
6.1 General .21
6.2 Thrown object test.21
6.3 Protective skirts test .21
7 Information for use.22
7.1 Operator’s Manual.22
7.2 Marking.22
7.3 Safety and instructional signs .23
Annex A (informative) Illustrations of mowers .24
A.1 Illustrations of mowers dealt with in this standard .24
A.2 Example of mowers not dealt with in this standard .29
Annex ZA (informative) Relationship between this International Standard and the Essential
Requirements of EU Directive 98/37/EC, amended by Directive 98/79/EC .31
Bibliography.32

© ISO 2007 — All rights reserved iii

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ISO/DIS 4254-12
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. 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.
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.
ISO 4254-12 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and
forestry, Subcommittee SC 7, Equipment for harvesting and conservation.
ISO 4254 consists of the following parts, under the general title Agricultural machinery — Safety:
⎯ Part 1: General requirements
⎯ Part 2: Anhydrous ammonia applicators
⎯ Part 3: Tractors
⎯ Part 5: Power-driven soil-working equipment
⎯ Part 6: Sprayers and liquid fertilizer distributors
⎯ Part 7: Combine harvesters, forage and cotton harvesters
⎯ Part 9: Equipment for sowing, planting and distributing fertilizers
⎯ Part 10: Rotary tedders and rakes
⎯ Part 11: Pick-up balers
⎯ Part 12: Rotary disc and drum mowers and flail-mowers
Part 3, Tractors, is to be revised under a separate number and published as ISO 26322. Part 4, Forestry
winches, is published as ISO 19472, Machinery for forestry – Winches – Terms and definitions, performance
and safety.
iv © ISO 2007 — All rights reserved

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ISO/DIS 4254-12
Introduction
The structure of safety standards in the field of machinery is as follows:
⎯ type-A standards (basis safety standards) giving basic concepts, principle for design, and general aspects
that can be applied to machinery;
⎯ type-B standards (generic safety standards) dealing with one safety aspect or one type of safeguards that
can be used across a wide range of machinery:
⎯ type-B1 standards on particular safety aspects (e.g. safety distances, surface temperature, noise);
⎯ type-B2 standards on safeguards (e.g. two-hands controls, interlocking devices, pressure sensitive
devices, guards);
⎯ type-C standards (machinery safety standards) dealing with detailed safety requirements for a particular
machine or group of machines.
This Standard is a type C standard as stated in ISO 12100-1.
When provisions of this type C standard are different from those which are stated in type A or B standards, the
provisions of this type C standard take precedence over the provisions of the other standards, for machines
that have been designed and built according to the provisions of this type C standard.
The machinery concerned and the extent to which hazards, hazardous situations and events are covered are
indicated in the scope of this document.

© ISO 2007 — All rights reserved v

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DRAFT INTERNATIONAL STANDARD ISO/DIS 4254-12

Agricultural machinery — Safety —
Part 12:
Rotary mowers and flail-mowers
1 Scope
This part of ISO 4254, intended to be used together with ISO 4254-1:____, specifies the safety requirements
and their verification for the design and construction of flail-mowers with horizontal axis for agriculture, rotary
disc mowers, rotary drum mower, mounted, semi-mounted, trailed or self-propelled as used for forage crop
harvesting in agriculture only. It describes methods for the elimination or reduction of hazards arising from the
intended use of these machines by one person (the operator) in the course of normal operation and service. In
addition, it specifies the type of information on safe working practices to be provided by the manufacturer.
When provisions of this part of ISO 4254 are different from those which are stated in ISO 4254-1:____ the
provisions of this part of ISO 4254 take precedence over the provisions of ISO 4254-1:____ for machines that
have been designed and built according the provisions of this part of ISO 4254.
This part of ISO 4254, taken together with ISO 4254-1:____, deals with all the significant hazards, hazardous
situations and events relevant to this agricultural machinery used as intended and under the conditions
foreseen by the manufacturer (see Clause 4).
This standard is also applicable to mowers equipped with a conditioning device.
This standard applies only to mowers intended to work at ground level.
NOTE 1 Examples of such machines are given in Annex A.1.
It does not apply to:
⎯ mowers with an articulated arm,
NOTE 2 An example of such a machine is given in Annex A.2.
⎯ mowers with one or more vertical axis designed for mulching,
NOTE 3 An example of such a machine is given in Annex A.2.
⎯ pedestrian-controlled motor mowers,
⎯ lawn mowers or machines designed as lawn mowers,
⎯ inter-row mowing units,
⎯ machines specifically designed for highway and road maintenance.
This part of ISO 4254 is also not applicable to environmental hazards, road safety, electromagnetic
compatibility, vibration and hazards related to moving parts for power transmission. It is not applicable to
hazards related to maintenance or repairs to be carried out by professional service personnel.
NOTE 4 ISO 14982 specifies test methods and acceptance criteria for evaluating the electromagnetic compatibility of
all kind of mobile agricultural machinery.
© ISO 2007 — All rights reserved 1

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ISO/DIS 4254-12
This part of ISO 4254 is not applicable to rotary disc and drum mowers and flail-mowers which are
manufactured before the date of its publication.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
1)
ISO 730-1:1994 , Agricultural wheeled tractors – Rear-mounted three-point linkage – Part 1: Categories 1, 2,
3 and 4
ISO 3600:1996, Tractors, machinery for agriculture and forestry, powered lawn and garden equipment -
Operator's manual – Content and presentation
2)
ISO 4254-1:____ , Agricultural machinery – Agricultural self-propelled, mounted, semi-mounted and trailed
machines – Common safety requirements
ISO 5718:2002, Harvesting equipment – Blades for agricultural rotary mowers – Requirements
ISO 11684:1995, Tractors, machinery for agricultural and forestry, powered lawn and garden equipment –
Safety signs and hazard pictorials – General Principles
ISO 12100-1:2003, Safety of machinery – Basic concepts, general principles for design – Part 1: Basic
terminology, methodology
ISO 12100-2:2003, Safety of machinery – Basic concepts, general principles for design – Part 2: Technical
principles
3)
ISO 13852:1996 , Safety of machinery – Safety distances to prevent danger zones being reached by the
upper limbs
ISO 17101:2004, Agricultural machinery – Rotary and flail mowers – Thrown-object test and acceptance
criteria
ISO 17103:2003, Agricultural machinery – Rotary and flail mowers – Test methods and acceptance criteria for
protective skirts
3 Definitions
For the purposes of this part of ISO 4254, the following terms and definitions apply together with the
definitions given in ISO 12100-1:2003 and ISO 4254-1:____.
NOTE Annex A.1 gives illustrations of mowers and components.
3.1
rotary mower
mower in which one or more functional components cut or shear forage crop by impact without mulching and
rotate about a vertical axis

1) Under revision
2) Consolidated revision of ISO 4254-1: 2005 including Amendment A1 under preparation
3) Under revision
2 © ISO 2007 — All rights reserved

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ISO/DIS 4254-12
3.1.1
rotary disc mower
rotary mower (3.1) where the drive line is below the path of the cutting elements
3.1.2
drum mower
rotary mower (3.1) where the drive line is above the path of the cutting elements
3.1.3
cutting height (disc and drum mowers)
distance from the ground to the active cutting edge of the cutting element when the cutting element is in the
forward-most position of rotation.
3.2
flail-mower
mower with a multiplicity of free-swinging cutting elements that rotate about a horizontal axis, which cuts the
crop by impact and mulches it with the same working elements
3.3
conditioning device
mechanical device allowing the acceleration of the crop-drying process (e.g. crushing, impact, abrasion)
3.4
swath board
adjustable device for controlling the swath width
3.5
mulching
operation intended to chop the crop and leave the material on the ground to naturally decompose
3.6
protective skirt
a skirt used on the machine to provide increased protection from thrown objects
3.7
roll type conditioner
a crop drying process that is achieved by passing material between at least two rollers
3.8
impeller type conditioner
a crop drying process that is achieved by utilizing tines or spokes to scrub off the wax coating from the crop
4 List of significant hazards
Table 1 gives the significant hazard(s), the significant hazardous situation(s) and event(s) covered by this part
of ISO 4254, that have been identified by risk assessment as being significant for this type of machine, and
which require specific action to eliminate or to reduce the risk.
Attention is drawn to the necessity to verify that the safety requirements specified in this part of ISO 4254
apply to each significant hazard presented by a given machine and to validate that the risk assessment is
complete.
© ISO 2007 — All rights reserved 3

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ISO/DIS 4254-12

Table 1 — List of significant hazards associated with rotary mowers and flail-mowers
N° Hazard Hazardous Clause/sub- Clause/sub-
situation and clause of ISO clause of this
event 4254-1:____ part of ISO
4254
1.1 Crushing hazard  5.1, 5.4, 5.6,
7.1, 7.2

1.2 Shearing hazard  5.1, 5.2, 5.5,
5.6, 5.7, 7.1, 7.2
1.3 Cutting or  5.2, 5.3, 5.6,
severing hazard 5.8, 5.9
1.4 Entanglement  5.1, 5.2, 5.5,
hazard 5.6, 7.1
1.5 Drawing-in or  5.4, 7.1, 7.2,
trapping hazard 5.8, 5.9
1.6 Impact hazard  5.2, 5.4, 5.5,
5.6, 7.1, 7.2
1.7 High pressure 4.10, 6.5
fluid injection
hazard
1.8 Ejection of parts  5.3, 5.7
2.1 Contact of Electrical 4.9
persons with hazards, caused
active parts by electrical
contact (direct or
indirect)
2.2 Hazards due to 5.1.8.2, 5.3, 5.6
batteries, fire,
emissions of
dust and gas,
etc
3 Thermal hazards resulting in 5.5
burns and scalds, by a possible
contact of persons, by flames or
explosions and also by the
radiation of heat sources
4 © ISO 2007 — All rights reserved

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ISO/DIS 4254-12

N° Hazard Hazardous Clause/sub- Clause/sub-
situation and clause of ISO clause of this
event 4254-1:____ part of ISO
4254
4.1 Hearing loss - Noise 4.2
(deafness),
other
physiological
disorders (e.g.
loss of balance,
loss of
awareness)
5.1 unhealthy  5.4, 6.1
postures or
excessive
efforts
5.2 human error  7.1, 7.2
6.1 failure of energy a) failure, 6.1.1, 4.8.2, 5.4, 5.6
supply (of malfunction of 5.1.8
energy and/or control system
control circuits) (unexpected
start up,
unexpected
overrun);

b) starting and
stopping devices
6.2 errors of fitting  7.1
6.3 overturn,  7.1
unexpected loss
of machine
stability
7.1 all kinds of  5.1, 5.6, 7.1, 7.2
guard
7.2 all kinds of  5.1, 5.6, 7.1, 7.2
safety related
(protection)
devices
7.3 safety signs and  7.1
signals
© ISO 2007 — All rights reserved 5

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ISO/DIS 4254-12

N° Hazard Hazardous Clause/sub- Clause/sub-
situation and clause of ISO clause of this
event 4254-1:____ part of ISO
4254
7.4 essential  7.1, 7.2
equipment and
accessories for
safe
adjusting and/or
maintaining
8 Hazards due to  5.1, 5.4, 7.1, 7.2
sudden
movement,
instability, etc
9.1 hazards to  5.4, 5.8, 7.1, 7.2
exposed persons
due to incontrolled
movement
9.2 Hazards due to  5.3, 5.7, 7.1, 7.2
break-up and/or
ejection pf parts
9.3 Loss of stability  7.1
5 Safety requirements and/or protective measures
5.1 General
5.1.1 Machinery shall be in accordance with the safety requirements and/or protective measures of this
clause. In addition, the machine shall be designed according to the principles of ISO 12100-1:2003, Clause 5
for hazards relevant but not significant, which are not dealt with by this part of ISO 4254. For these hazards
ISO 12100-2 may be used for guidance.
5.1.2 Except where otherwise specified in this part of ISO 4254, the machine shall comply with the
requirements of ISO 4254-1:____ and with tables 1, 3, 4 and 6 of ISO 13852:1996.
5.2 Protection against inadvertent contact with the cutting elements
5.2.1 General
The mower shall be designed or guarded in such a way that any inadvertent contact during normal operation and service
with the cutting elements at the front, at the rear, at the sides and on top is prevented.
5.2.1.1 Vertical axes mower
The top protection shall be achieved by an imperforate guard or by the device used to prevent projections
(see 5.3).
At any location along the cutting element path that is not either a crop inlet or a crop discharge area, typically
the sides and a portion of the rear, the protection shall be achieved by:
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ISO/DIS 4254-12
⎯ a barrier located in such a way that the distances defined in Figure 1 are respected. These distances are
measured from the tool path and with the mower in working position, the cutting height being adjusted at
50 mm or as near as possible to 50 mm.
This barrier can be removable or folded for transport or maintenance. The removal of the barrier shall
only be possible by use of a tool; foldable barriers shall be kept in the locked working position by means
of a device. Unlocking this device shall be the result of an intentional action.
and/or
⎯ a rigid imperforate guard, located near the working elements and in such a way that its lower edge
extends below the working elements path by a minimum of 3 mm (see Figure 2).
At the crop inlet area and the crop discharge area, the protection shall be achieved by a barrier located in
such a way that the minimum distances as defined in Figure 1 are respected with the mower in the
working position and the cutting height being adjusted at 50 mm or as near as possible to 50 mm. This
barrier can be removable or folded for transport or maintenance. The removal of the barrier shall only be
possible by use of a tool; foldable barriers shall be kept in the locked working position by means of a
device. Unlocking this device shall be the result of an intentional action.

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ISO/DIS 4254-12

Dimensions in millimetres

Key
1 – Cutting height
2 – Ground
3 – Barrier
4 – Area in which the barriers shall be located
5 – Rigid imperforate guard
6 – Top imperforate guard
Figure 1 — Vertical axes mower – Location of the barrier
and rigid imperforate guard – Front and rear view

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ISO/DIS 4254-12

Dimensions in millimetres

Key
1 – Cutting height
2 – Cutting element path
3 – Ground
4 – Barrier
5 – Area in which the barriers shall be located
6 – Top imperforate guard
7 – Rigid imperforate guard
Figure 2 — Vertical axes mower – Location of the barrier and imperforate guard – Side view
© ISO 2007 — All rights re
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