EN ISO 4254-12:2012

SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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.

Contents Page
Foreword .3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC .4

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.
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.

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
ISO 4254-12:2012(E)
©  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 copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved

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 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

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.
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 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

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 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

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
...