ISO 4254-13:2023
(Main)Agricultural machinery — Safety — Part 13: Large rotary mowers
Agricultural machinery — Safety — Part 13: Large rotary mowers
This document, when used together with ISO 4254-1, specifies the safety requirements and their verification for the design and construction of towed, semi-mounted, or mounted large rotary mowers with single or multiple cutting elements which have a cutting element tip circle of 1 000 mm or greater for any single cutting-element assembly, mounted on a propelling tractor or machine, intended for agricultural mowing equipment and designed for shredding crop residue, grass and small brush by impact. 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. NOTE 1 When used outside of agriculture, additional requirements not specified in this document can be applicable. This document is not applicable to: — rotary disc mowers, rotary drum mowers, and flail mowers designed for forage crop harvesting as covered by ISO 4254-12; — arm-type large rotary mowers; — pedestrian-controlled motor mowers; — lawn mowers covered by the ISO 5395 series. When requirements of this document are different from those which are stated in ISO 4254-1, the requirements of this document take precedence over the provisions of ISO 4254-1 for machines that have been designed and built according to the provisions of this document. This document is also not applicable to environmental hazards, road safety, electromagnetic compatibility, vibration and hazards related to moving parts for power transmission. It is also not applicable to hazards related to maintenance or repairs to be carried out by professional service personnel. This document, taken together with ISO 4254-1, deals with all the significant hazards, hazardous situations and events relevant to large rotary mowers used as intended and under the conditions foreseen by the manufacturer. (A list of significant hazards is provided in Annex A.) NOTE 2 Example illustrations of two mowers (a rigid-deck large rotary mower and a trail-type multi-section, foldable-wing large rotary mower) dealt with in this document are shown in Annex C, C.1. NOTE 3 Example illustrations of mowers not dealt with in this document are shown in Annex C, C.2. NOTE 4 ISO 14982 specifies test methods and acceptance criteria for evaluating the electromagnetic compatibility of all kinds of mobile agricultural machinery. This document is not applicable to large rotary mowers which are manufactured before the date of publication.
Matériel agricole — Sécurité — Partie 13: Grandes faucheuses rotatives
Le présent document, 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 grandes faucheuses rotatives tractées, semi-portées ou portées pourvues d'un ou de plusieurs éléments de coupe ayant une circonférence de coupe supérieur ou égal à 1 000 mm, montées sur un tracteur ou une machine motrice, destinées au matériel de fauchage agricole et conçues pour le broyage de résidus végétaux, d'herbe et de broussailles par impact. Il décrit des méthodes permettant de réduire ou d'éliminer les phénomènes dangereux découlant d'une utilisation normale et d'une mauvaise utilisation raisonnablement prévisible de ces machines par une personne (l'opérateur) au cours du fonctionnement normal et de l'entretien. En outre, il spécifie le type d'informations que le fabricant doit donner sur les pratiques d'utilisation sûre. NOTE 1 En cas d'utilisation dans une activité non agricole, des exigences supplémentaires non spécifiées dans le présent document peuvent s'appliquer. Le présent document ne s'applique pas: — aux faucheuses rotatives à disques, aux faucheuses à tambours rotatifs et aux faucheuses-broyeuses conçues pour la récolte de fourrage qui sont couvertes par l'ISO 4254-12; — aux grandes faucheuses rotatives à bras; — aux motofaucheuses à conducteur à pied; — aux tondeuses à gazon qui sont couvertes par la série ISO 5395. Lorsque des exigences du présent document sont différentes de celles énoncées dans l'ISO 4254-1, les exigences du présent document prévalent sur les dispositions de l'ISO 4254-1 pour les machines conçues et fabriquées conformément aux dispositions du présent document. Le présent document ne s'applique pas aux phénomènes dangereux liés à environnement, à la sécurité routière, à la compatibilité électromagnétique, aux vibrations ni aux phénomènes dangereux liés aux éléments mobiles de transmission de puissance. Il ne s'applique pas non plus aux phénomènes dangereux liés aux opérations de maintenance ou de réparation qui doivent être exécutées par des professionnels habilités. Le présent document, utilisé conjointement avec l'ISO 4254-1, traite de tous les phénomènes dangereux et situations et événements dangereux significatifs inhérents aux grandes faucheuses rotatives dans le cadre d'une utilisation normale et des conditions prévues par le fabricant. (Une liste de phénomènes dangereux significatifs est fournie à l'Annexe A.) NOTE 2 À titre d'exemple, deux illustrations de faucheuses (une grande faucheuse rotative à châssis rigide et une grande faucheuse rotative traînée à ailes repliables multisection) couvertes par le présent document sont présentées en Annexe C, C.1. NOTE 3 À titre d'exemple, des illustrations de faucheuses non couvertes par le présent document sont présentées en Annexe C, C.2. NOTE 4 L'ISO 14982 spécifie des méthodes d'essai et des critères d'acceptation pour l'évaluation de la compatibilité électromagnétique de tous les types de matériel agricole mobile. Le présent document ne s'applique pas aux grandes faucheuses rotatives fabriquées avant sa date de publication par l'ISO.
General Information
Relations
Buy Standard
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 4254-13
Second edition
2023-04
Agricultural machinery — Safety —
Part 13:
Large rotary mowers
Matériel agricole — Sécurité —
Partie 13: Grandes faucheuses rotatives
Reference number
ISO 4254-13:2023(E)
© ISO 2023
---------------------- Page: 1 ----------------------
ISO 4254-13:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
© ISO 2023 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 4254-13:2023(E)
Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
3.1 Rotary mowers . 2
3.2 Cutting elements . 3
3.3 Thrown-object testing . 3
4 Safety requirements and/or protective/risk reduction measures .4
4.1 General . 4
4.2 Protection against thrown objects . 4
4.3 Protection against inadvertent contact with the cutting elements . 4
4.4 Rotating power component guarding and shielding . 5
4.5 Overrunning clutch or freewheel device . 5
4.6 Attachment means for trailed mowers . 5
4.7 Attachment means for mounted and semi-mounted mowers . 5
4.8 Cutting elements . 5
4.9 Impact of the cutting-element assemblies . 5
4.10 Unbalance . 6
4.11 Structural integrity . 6
5 Verification of safety requirements and/or protective/risk reduction measures .6
5.1 Test conditions — General . 6
5.1.1 Assembly. 6
5.1.2 Mower position . 6
5.1.3 Test speed . 6
5.1.4 Number of tests . 6
5.2 Foot-probe test . 6
5.2.1 Foot-probe test equipment . 6
5.2.2 Test conditions . 8
5.2.3 Test procedure. 9
5.2.4 Test acceptance . 9
5.3 Impact test for cutting-element assemblies . 9
5.3.1 Test equipment . 9
5.3.2 Test conditions . 9
5.3.3 Test procedure. 9
5.3.4 Test acceptance . 12
5.4 Unbalance test for cutting-element assemblies .12
5.4.1 Test equipment .12
5.4.2 Test conditions — Multi-piece cutting element assembly .12
5.4.3 Test conditions — One-piece cutting element construction .12
5.4.4 Test procedure.12
5.4.5 Test acceptance . 12
5.5 Structural integrity test .12
5.5.1 Test equipment .12
5.5.2 Test conditions . 13
5.5.3 Test procedure.13
5.5.4 Test acceptance . 13
5.6 Thrown object test .13
5.6.1 Operator zone . .13
5.6.2 Test equipment . 16
5.6.3 Test conditions . 17
5.6.4 Test procedure. 18
iii
© ISO 2023 – All rights reserved
---------------------- Page: 3 ----------------------
ISO 4254-13:2023(E)
5.6.5 Scoring . 19
5.6.6 Test acceptance . 19
6 Information for use .20
6.1 Operator's manual . 20
7 Marking and safety signs .21
7.1 Marking . 21
7.2 Safety signs . 21
Annex A (informative) List of significant hazards .22
Annex B (informative) Example of test recording forms .24
Annex C (informative) Example illustrations of mowers .27
Annex D (normative) Corrugated fibreboard penetration tests .30
Bibliography .32
iv
© ISO 2023 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 4254-13:2023(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.
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
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 7, Equipment for harvesting and conservation.
This second edition cancels and replaces the first edition (ISO 4254-13:2012), which has been
technically revised.
The main changes are as follows:
— additional information has been added to the Scope regarding applicability;
— the Normative references have been updated;
— in Clause 3:
— some terms and definitions have been modified, added or removed;
— former Figure 1 has been removed and subsequent figures have been renumbered;
— blade test and performance requirements have been moved to ISO 5718-2;
— in Clause 4, subclauses 4.8, 4.9, 4.10 and 4.11 have been revised to reflect the strength and
performance requirements in the standards concerned;
— in Clause 5:
— title has been revised;
— Figure 2 (former Figure 3) has been modified;
— Figure 3 (former Figure 4) has been modified;
v
© ISO 2023 – All rights reserved
---------------------- Page: 5 ----------------------
ISO 4254-13:2023(E)
— 5.2.2.3 has been added to indicate a test condition;
— 5.3.1.4 has been modified to indicate new requirements for test equipment;
— 5.4.1.4 has been added to indicate new requirements for test equipment;
— 5.4.5 test acceptance criteria has been modified;
— 5.5.4 test acceptance criteria has been modified;
— subclause 5.7 and succeeding subclauses have been removed;
— subclause 5.8 and succeeding subclauses, including Table 1 and Figure 12, have been removed;
— 5.6.2.6 has been modified to correct an error in the sand particle size requirements for test
equipment;
— the Bibliography has been updated.
A list of all parts of ISO 4254 series can be found on the ISO website.
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.
vi
© ISO 2023 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 4254-13:2023(E)
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 (for example, safety distances, surface
temperature, noise);
— type-B2 standards on safeguards (for example, 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.
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.
Significant hazards that are common to all agricultural machines (self-propelled ride-on, mounted,
semi-mounted and trailed) are dealt with in ISO 4254-1.
vii
© ISO 2023 – All rights reserved
---------------------- Page: 7 ----------------------
INTERNATIONAL STANDARD ISO 4254-13:2023(E)
Agricultural machinery — Safety —
Part 13:
Large rotary mowers
1 Scope
This document, when used together with ISO 4254-1, specifies the safety requirements and their
verification for the design and construction of towed, semi-mounted, or mounted large rotary mowers
with single or multiple cutting elements which have a cutting element tip circle of 1 000 mm or greater
for any single cutting-element assembly, mounted on a propelling tractor or machine, intended for
agricultural mowing equipment and designed for shredding crop residue, grass and small brush by
impact. 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.
NOTE 1 When used outside of agriculture, additional requirements not specified in this document can be
applicable.
This document is not applicable to:
— rotary disc mowers, rotary drum mowers, and flail mowers designed for forage crop harvesting as
covered by ISO 4254-12;
— arm-type large rotary mowers;
— pedestrian-controlled motor mowers;
— lawn mowers covered by the ISO 5395 series.
When requirements of this document are different from those which are stated in ISO 4254-1, the
requirements of this document take precedence over the provisions of ISO 4254-1 for machines that
have been designed and built according to the provisions of this document.
This document is also not applicable to environmental hazards, road safety, electromagnetic
compatibility, vibration and hazards related to moving parts for power transmission. It is also not
applicable to hazards related to maintenance or repairs to be carried out by professional service
personnel.
This document, taken together with ISO 4254-1, deals with all the significant hazards, hazardous
situations and events relevant to large rotary mowers used as intended and under the conditions
foreseen by the manufacturer. (A list of significant hazards is provided in Annex A.)
NOTE 2 Example illustrations of two mowers (a rigid-deck large rotary mower and a trail-type multi-section,
foldable-wing large rotary mower) dealt with in this document are shown in Annex C, C.1.
NOTE 3 Example illustrations of mowers not dealt with in this document are shown in Annex C, C.2.
NOTE 4 ISO 14982 specifies test methods and acceptance criteria for evaluating the electromagnetic
compatibility of all kinds of mobile agricultural machinery.
This document is not applicable to large rotary mowers which are manufactured before the date of
publication.
1
© ISO 2023 – All rights reserved
---------------------- Page: 8 ----------------------
ISO 4254-13:2023(E)
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 730, Agricultural wheeled tractors — Rear-mounted three-point linkage — Categories 1N, 1, 2N, 2, 3N,
3, 4N and 4
ISO 4254-1, Agricultural machinery — Safety — Part 1: General requirements
ISO 5673-1, Agricultural tractors and machinery — Power take-off drive shafts and power-input connection
— Part 1: General manufacturing and safety requirements
ISO 5718-2, Harvesting equipment – Requirements for cutting elements – Part 2: Blades for large rotary
mowers (under development)
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13857:2019, Safety of machinery — Safety distances to prevent hazard zones being reached by upper
and lower limbs
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4254-1, ISO 12100 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/ .
3.1 Rotary mowers
3.1.1
large rotary mower
mower, which may include mulching, with single or multiple cutting-element assemblies which have a
cutting-element tip circle (3.2.4) of 1 000 mm or greater powered by a propelling machine in which one
or more functional components rotate(s) about a vertical axis to cut or shear crop residue, grass and
small brush by impact
3.1.1.1
rigid-deck large rotary mower
large rotary mower (3.1.1) with single or multiple cutting-element assemblies on a common rigid deck
3.1.1.2
multi-section, foldable-wing large rotary mower
large rotary mower (3.1.1) with multiple cutting-element assemblies and with a single wing or multiple
wings that are capable of following the terrain
Note 1 to entry: The wings are foldable for transport and to clear obstacles, but are intended to operate only with
all sections in close proximity to the ground surface when mowing.
2
© ISO 2023 – All rights reserved
---------------------- Page: 9 ----------------------
ISO 4254-13:2023(E)
3.2 Cutting elements
3.2.1
cutting element
mower tool designed to cut or shear crop residue, grass and small brush by impact
Note 1 to entry: This can include mulching.
Note 2 to entry: Blades are common cutting-elements used on large rotary mowers.
3.2.2
cutting-element holder
rotating part of the mower to which the cutting element (3.2.1) is fastened
3.2.3
cutting-element assembly
rotating group of parts including cutting element(s) (3.2.1), cutting-element holder (3.2.2), cutting-
element fasteners
3.2.4
cutting-element tip circle
maximum cutting diameter of the cutting-element assembly (3.2.3)
3.2.5
cutting-element enclosure
housing for the cutting-element assembly including the top deck, side deck, rigid or flexible guards
designed to minimize thrown objects or inadvertent blade contact
3.3 Thrown-object testing
3.3.1
projectile impact
rupture of the front layer but not the back layer of the target material (3.3.3) by a test projectile (3.3.4)
3.3.2
projectile hit
rupture of all layers of the target material (3.3.3) by a test projectile (3.3.4)
3.3.3
target material
material used for the thrown-object test
Note 1 to entry: See Annex D
3.3.4
test projectile
common steel nail or steel wire with the approximate dimensions shown in Figure 1
3
© ISO 2023 – All rights reserved
---------------------- Page: 10 ----------------------
ISO 4254-13:2023(E)
Note 1 to entry: The wire projectile should be capable of bending 180° with no cracks or breaks.
Dimensions in millimetres
a) Criteria for nail projectile b) Criteria for wire projectile
Figure 1 — Test projectile
3.3.5
target wall
arrangement of target material and supports
Note 1 to entry: See the cross-section in Figure 8 with configuration shown in Figures 6 and 7.
3.3.6
operator zone
space on the target wall (3.3.5) representing the area in which operator is seated on the propelling
machine with hands on the steering controls and feet on controls or areas provided for foot placement
while operating the mower
Note 1 to entry: For examples of target configurations, see Figures 6 and 7.
4 Safety requirements and/or protective/risk reduction measures
4.1 General
4.1.1 Machinery shall be in accordance with the safety requirements and/or protective/risk
reduction measures of Clauses 4 and 5. Machinery shall meet the test requirements and acceptance
criteria as specified in 5.3, 5.4 and 5.5. In addition, the machine shall be designed in accordance with
the principles of ISO 12100 for relevant but not significant hazards which are not dealt with by this
document.
4.1.2 Unless otherwise specified in this document, the machine shall be in accordance with the
requirements of ISO 4254-1 and with ISO 13857:2019, Tables 1, 3, 4 and 6.
4.1.3 The maximum tip speed for cutting elements shall not exceed 96,5 m/s.
4.2 Protection against thrown objects
The mower shall be designed to minimize thrown objects so that tests defined in 5.6 are satisfied.
Protective devices, for example, protective skirts, chains or rubber strips may be used.
4.3 Protection against inadvertent contact with the cutting elements
4.3.1 The mower shall be designed or guarded in such a way that any inadvertent contact with the
cutting elements at the sides and on the top is prevented when the mower is operated according to the
manufacturer’s instructions in the operator’s manual.
4
© ISO 2023 – All rights reserved
---------------------- Page: 11 ----------------------
ISO 4254-13:2023(E)
4.3.2 The mower shall be designed or guarded in such a way that any inadvertent contact with the
cutting elements at the front (normally the intake) and at the rear (normally the exhaust) is minimized
when the mower is operated according to the manufacturer’s instructions in the operator’s manual.
4.3.3 The top protection shall be achieved by a rigid guard or by the device used to prevent thrown-
objects.
4.3.4 At the sides, at the front (intake area) and at the rear (exhaust area), there shall be protection
by rigid or flexible guard; the device used to minimize projectiles; or a combination of these devices so
when tested according to 5.2, there will be no contact between the foot-probe and the cutting element
or the cutting-element assembly.
4.4 Rotating power component guarding and shielding
4.4.1 The mower shall be designed or guarded in such a way that any inadvertent contact with the
rotating power component is minimized when the mower is operated according to the manufacturer’s
instructions in the operator’s manual.
4.4.2 Drive shafts and their connecting points shall be guarded per ISO 5673-1. Other moving
parts for power transmission shall be guarded against contact to comply with the safety distances of
ISO 13857:2019, Tables 1, 3, 4 and 6.
4.5 Overrunning clutch or freewheel device
4.5.1 Mowers equipped with an overrunning clutch or a free-wheel device shall be guarded as
described in 4.4.
4.5.2 Rotating elements that can be inadvertently contacted shall have evidence of rotation and a
suitable safety sign to warn of the hazard.
4.5.3 There shall be instructions in the operator's manual stating to wait until all movement is
stopped before servicing.
4.6 Attachment means for trailed mowers
Any trailed unit shall be designed in such a manner that there is a remaining downward load of 3 % of
the total weight, or at least 500 N on the hitch point, in order to avoid an uncontrolled upward movement
when it is disconnected.
4.7 Attachment means for mounted and semi-mounted mowers
Three-point hitch-mounted and semi-mounted mowers shall be attached to the propelling machine by
means of one or a combination of the standardized attachment methods in accordance with ISO 730.
4.8 Cutting elements
Blades used as cutting elements shall meet the s
...
INTERNATIONAL ISO
STANDARD 4254-13
Second edition
Agricultural machinery — Safety —
Part 13:
Large rotary mowers
Matériel agricole — Sécurité —
Partie 13: Grandes faucheuses rotatives
PROOF/ÉPREUVE
Reference number
ISO 4254-13:2023(E)
© ISO 2023
---------------------- Page: 1 ----------------------
ISO 4254-13:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
PROOF/ÉPREUVE © ISO 2023 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 4254-13:2023(E)
Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
3.1 Rotary mowers . 2
3.2 Cutting elements . 3
3.3 Thrown-object testing . 3
4 Safety requirements and/or protective/risk reduction measures .4
4.1 General . 4
4.2 Protection against thrown objects . 4
4.3 Protection against inadvertent contact with the cutting elements . 4
4.4 Rotating power component guarding and shielding . 5
4.5 Overrunning clutch or freewheel device . 5
4.6 Attachment means for trailed mowers . 5
4.7 Attachment means for mounted and semi-mounted mowers . 5
4.8 Cutting elements . 5
4.9 Impact of the cutting-element assemblies . 5
4.10 Unbalance . 6
4.11 Structural integrity . 6
5 Verification of safety requirements and/or protective/risk reduction measures .6
5.1 Test conditions — General . 6
5.1.1 Assembly. 6
5.1.2 Mower position . 6
5.1.3 Test speed . 6
5.1.4 Number of tests . 6
5.2 Foot-probe test . 6
5.2.1 Foot-probe test equipment . 6
5.2.2 Test conditions . 8
5.2.3 Test procedure. 9
5.2.4 Test acceptance . 9
5.3 Impact test for cutting-element assemblies . 9
5.3.1 Test equipment . 9
5.3.2 Test conditions . 9
5.3.3 Test procedure. 9
5.3.4 Test acceptance . 12
5.4 Unbalance test for cutting-element assemblies .12
5.4.1 Test equipment .12
5.4.2 Test conditions — Multi-piece cutting element assembly .12
5.4.3 Test conditions — One-piece cutting element construction .12
5.4.4 Test procedure.12
5.4.5 Test acceptance . 12
5.5 Structural integrity test .12
5.5.1 Test equipment .12
5.5.2 Test conditions . 13
5.5.3 Test procedure.13
5.5.4 Test acceptance . 13
5.6 Thrown object test .13
5.6.1 Operator zone . .13
5.6.2 Test equipment . 16
5.6.3 Test conditions . 17
5.6.4 Test procedure. 18
iii
© ISO 2023 – All rights reserved PROOF/ÉPREUVE
---------------------- Page: 3 ----------------------
ISO 4254-13:2023(E)
5.6.5 Scoring . 19
5.6.6 Test acceptance . 19
6 Information for use .20
6.1 Operator's manual . 20
7 Marking and safety signs .21
7.1 Marking . 21
7.2 Safety signs . 21
Annex A (informative) List of significant hazards .22
Annex B (informative) Example of test recording forms .24
Annex C (informative) Example illustrations of mowers.27
Annex D (informative) Corrugated fibreboard penetration tests .30
Bibliography .32
iv
PROOF/ÉPREUVE © ISO 2023 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 4254-13:2023(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.
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 7, Equipment for harvesting and conservation.
This second edition cancels and replaces the first edition (ISO 4254-13:2012), which has been
technically revised.
The main changes are as follows:
— additional information has been added to the Scope regarding applicability;
— the Normative references have been updated;
— in Clause 3:
— some terms and definitions have been modified, added or removed;
— former Figure 1 has been removed and subsequent figures have been renumbered;
— blade test and performance requirements have been moved to ISO 5718-2;
— in Clause 4, subclauses 4.8, 4.9, 4.10 and 4.11 have been revised to reflect the strength and
performance requirements in the standards concerned;
— in Clause 5:
— title has been revised;
— Figure 2 (former Figure 3) has been modified;
— Figure 3 (former Figure 4) has been modified;
— 5.2.2.3 has been added to indicate a test condition;
— 5.3.1.4 has been modified to indicate new requirements for test equipment;
v
© ISO 2023 – All rights reserved PROOF/ÉPREUVE
---------------------- Page: 5 ----------------------
ISO 4254-13:2023(E)
— 5.4.1.4 has been added to indicate new requirements for test equipment;
— 5.4.5 test acceptance criteria has been modified;
— 5.5.4 test acceptance criteria has been modified;
— subclause 5.7 and succeeding subclauses have been removed;
— subclause 5.8 and succeeding subclauses, including Table 1 and Figure 12, have been removed;
— 5.6.2.6 has been modified to correct an error in the sand particle size requirements for test
equipment;
— the Bibliography has been updated.
A list of all parts of ISO 4254 series can be found on the ISO website.
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.
vi
PROOF/ÉPREUVE © ISO 2023 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 4254-13:2023(E)
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 (for example, safety distances, surface temperature,
noise);
— type-B2 standards on safeguards (for example, 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.
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.
Significant hazards that are common to all agricultural machines (self-propelled ride-on, mounted,
semi-mounted and trailed) are dealt with in ISO 4254-1.
vii
© ISO 2023 – All rights reserved PROOF/ÉPREUVE
---------------------- Page: 7 ----------------------
INTERNATIONAL STANDARD ISO 4254-13:2023(E)
Agricultural machinery — Safety —
Part 13:
Large rotary mowers
1 Scope
This document, when used together with ISO 4254-1, specifies the safety requirements and their
verification for the design and construction of towed, semi-mounted, or mounted large rotary mowers
with single or multiple cutting elements which have a cutting element tip circle of 1 000 mm or greater
for any single cutting-element assembly, mounted on a propelling tractor or machine, intended for
agricultural mowing equipment and designed for shredding crop residue, grass and small brush by
impact. 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.
NOTE 1 When used outside of agriculture, additional requirements not specified in this document can be
applicable.
This document is not applicable to:
— rotary disc mowers, rotary drum mowers, and flail mowers designed for forage crop harvesting as
covered by ISO 4254-12;
— arm-type large rotary mowers;
— pedestrian-controlled motor mowers;
— lawn mowers covered by the ISO 5395 series.
When requirements of this document are different from those which are stated in ISO 4254-1, the
requirements of this document take precedence over the provisions of ISO 4254-1 for machines that
have been designed and built according to the provisions of this document.
This document is also not applicable to environmental hazards, road safety, electromagnetic
compatibility, vibration and hazards related to moving parts for power transmission. It is also not
applicable to hazards related to maintenance or repairs to be carried out by professional service
personnel.
This document, taken together with ISO 4254-1, deals with all the significant hazards, hazardous
situations and events relevant to large rotary mowers used as intended and under the conditions
foreseen by the manufacturer. (A list of significant hazards is provided in Annex A.)
NOTE 2 Example illustrations of two mowers (a rigid-deck large rotary mower and a trail-type multi-section,
foldable-wing large rotary mower) dealt with in this document are shown in Annex C, C.1.
NOTE 3 Example illustrations of mowers not dealt with in this document are shown in Annex C, C.2.
NOTE 4 ISO 14982 specifies test methods and acceptance criteria for evaluating the electromagnetic
compatibility of all kinds of mobile agricultural machinery.
This document is not applicable to large rotary mowers which are manufactured before the date of
publication.
1
© ISO 2023 – All rights reserved PROOF/ÉPREUVE
---------------------- Page: 8 ----------------------
ISO 4254-13:2023(E)
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 730, Agricultural wheeled tractors — Rear-mounted three-point linkage — Categories 1N, 1, 2N, 2, 3N,
3, 4N and 4
ISO 4254-1, Agricultural machinery — Safety — Part 1: General requirements
ISO 5673-1, Agricultural tractors and machinery — Power take-off drive shafts and power-input connection
— Part 1: General manufacturing and safety requirements
ISO 5718-2, Harvesting equipment – Requirements for cutting elements – Part 2: Blades for large rotary
mowers (under development)
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13857:2019, Safety of machinery — Safety distances to prevent hazard zones being reached by upper
and lower limbs
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4254-1, ISO 12100 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/ .
3.1 Rotary mowers
3.1.1
large rotary mower
mower, which may include mulching, with single or multiple cutting-element assemblies which have a
cutting-element tip circle (3.2.4) of 1 000 mm or greater powered by a propelling machine in which one
or more functional components rotate(s) about a vertical axis to cut or shear crop residue, grass and
small brush by impact
3.1.1.1
rigid-deck large rotary mower
large rotary mower (3.1.1) with single or multiple cutting-element assemblies on a common rigid deck
3.1.1.2
multi-section, foldable-wing large rotary mower
large rotary mower (3.1.1) with multiple cutting-element assemblies and with a single wing or multiple
wings that are capable of following the terrain
Note 1 to entry: The wings are foldable for transport and to clear obstacles, but are intended to operate only with
all sections in close proximity to the ground surface when mowing.
2
PROOF/ÉPREUVE © ISO 2023 – All rights reserved
---------------------- Page: 9 ----------------------
ISO 4254-13:2023(E)
3.2 Cutting elements
3.2.1
cutting element
mower tool designed to cut or shear crop residue, grass and small brush by impact
Note 1 to entry: This can include mulching.
Note 2 to entry: Blades are common cutting-elements used on large rotary mowers.
3.2.2
cutting-element holder
rotating part of the mower to which the cutting element (3.2.1) is fastened
3.2.3
cutting-element assembly
rotating group of parts including cutting element(s) (3.2.1), cutting-element holder (3.2.2), cutting-
element fasteners
3.2.4
cutting-element tip circle
maximum cutting diameter of the cutting-element assembly (3.2.3)
3.2.5
cutting-element enclosure
housing for the cutting-element assembly including the top deck, side deck, rigid or flexible guards
designed to minimize thrown objects or inadvertent blade contact
3.3 Thrown-object testing
3.3.1
projectile impact
rupture of the front layer but not the back layer of the target material (3.3.3) by a test projectile (3.3.4)
3.3.2
projectile hit
rupture of all layers of the target material (3.3.3) by a test projectile (3.3.4)
3.3.3
target material
material used for the thrown-object test
Note 1 to entry: See Annex D
3.3.4
test projectile
common steel nail or steel wire with the approximate dimensions shown in Figure 1
3
© ISO 2023 – All rights reserved PROOF/ÉPREUVE
---------------------- Page: 10 ----------------------
ISO 4254-13:2023(E)
Note 1 to entry: The wire projectile should be capable of bending 180° with no cracks or breaks.
Dimensions in millimetres
a) Criteria for nail projectile b) Criteria for wire projectile
Figure 1 — Test projectile
3.3.5
target wall
arrangement of target material and supports
Note 1 to entry: See the cross-section in Figure 8 with configuration shown in Figures 6 and 7.
3.3.6
operator zone
space on the target wall (3.3.5) representing the area in which operator is seated on the propelling
machine with hands on the steering controls and feet on controls or areas provided for foot placement
while operating the mower
Note 1 to entry: For examples of target configurations, see Figures 6 and 7.
4 Safety requirements and/or protective/risk reduction measures
4.1 General
4.1.1 Machinery shall be in accordance with the safety requirements and/or protective/risk reduction
measures of Clauses 4 and 5. Machinery shall meet the test requirements and acceptance criteria as
specified in 5.3, 5.4 and 5.5. In addition, the machine shall be designed in accordance with according
to the principles of ISO 12100 for relevant but not significant hazards which are not dealt with by this
document.
4.1.2 Unless otherwise specified in this document, the machine shall be in accordance with the
requirements of ISO 4254-1 and with ISO 13857:2019, Tables 1, 3, 4 and 6.
4.1.3 The maximum tip speed for cutting elements shall not exceed 96,5 m/s.
4.2 Protection against thrown objects
The mower shall be designed to minimize thrown objects so that tests defined in 5.6 are satisfied.
Protective devices, for example, protective skirts, chains or rubber strips may be used.
4.3 Protection against inadvertent contact with the cutting elements
4.3.1 The mower shall be designed or guarded in such a way that any inadvertent contact with the
cutting elements at the sides and on the top is prevented when the mower is operated according to the
manufacturer’s instructions in the operator’s manual.
4
PROOF/ÉPREUVE © ISO 2023 – All rights reserved
---------------------- Page: 11 ----------------------
ISO 4254-13:2023(E)
4.3.2 The mower shall be designed or guarded in such a way that any inadvertent contact with the
cutting elements at the front (normally the intake) and at the rear (normally the exhaust) is minimized
when the mower is operated according to the manufacturer’s instructions in the operator’s manual.
4.3.3 The top protection shall be achieved by a rigid guard or by the device used to prevent thrown-
objects.
4.3.4 At the sides, at the front (intake area) and at the rear (exhaust area), there shall be protection
by rigid or flexible guard; the device used to minimize projectiles; or a combination of these devices so
when tested according to 5.2, there will be no contact between the foot-probe and the cutting element
or the cutting-element assembly.
4.4 Rotating power component guarding and shielding
4.4.1 The mower shall be designed or guarded in such a way that any inadvertent contact with the
rotating power component is minimized when the mower is operated according to the manufacturer’s
instructions in the operator’s manual.
4.4.2 Drive shafts and their connecting points shall be guarded per ISO 5673-1. Other moving
parts for power transmission shall be guarded against contact to comply with the safety distances of
ISO 13857:2019, Tables 1, 3, 4 and 6.
4.5 Overrunning clutch or freewheel device
4.5.1 Mowers equipped with an overrunning clutch or a free-wheel device shall be guarded as
described in 4.4.
4.5.2 Rotating elements that can be inadvertently contacted shall have evidence of rotation and a
suitable safety sign to warn of the hazard.
4.5.3 There shall be instructions in the operator's manual stating to wait until all movement is
stopped before servicing.
4.6 Attachment means for trailed mowers
Any trailed unit shall be designed in such a manner that there is a remaining downward load of 3 % of
the total weight, or at least 500 N on the hitch point, in order to avoid an uncontrolled upward movement
when it is disconnected.
4.7 Attachment means for mounted and semi-mounted mowers
Three-point hitch-mounted and semi-mounted mowers shall be attached to the propelling machine by
means of one or a combination of the standardized attachment methods in accordance with ISO 730.
4.8 Cutting elements
Blades used as cutting elements shall meet the strength and performance requirements set forth in
ISO 5718-2.
4.9 Impact of the cutting-element asse
...
Date: 2022-11-152023-02-22
ISO 4254-13:20222023(E)
ISO/TC 23/SC 7
Secretariat: UNI
Agricultural machinery — Safety — Part 13: Large rotary mowers
Matériel agricole — Sécurité — Partie 13: Grandes faucheuses rotatives
---------------------- Page: 1 ----------------------
ISO 4254-13:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of
this publication may be reproduced or utilized otherwise in any form or by any means, electronic or
mechanical, including photocopying, or posting on the internet or an intranet, without prior written
permission. Permission can be requested from either ISO at the address below or ISO’sISO's member body
in the country of the requester.
ISO copyright officeCopyright Office
Ch. de Blandonnet 8 • CP 401
• CH-1214 Vernier, Geneva, Switzerland
Tel.Phone: + 41 22 749 01 11
Fax + 41 22 749 09 47
copyright@iso.org
www.iso.org
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland.
ii © ISO 2023 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 4254-13:2023(E)
Contents Page
Foreword . v
Introduction . vii
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
3.1 Rotary mowers . 2
3.2 Cutting elements . 3
3.3 Thrown-object testing . 3
4 Safety requirements and/or protective/risk reduction measures . 4
4.1 General . 4
4.2 Protection against thrown objects . 5
4.3 Protection against inadvertent contact with the cutting elements . 5
4.4 Rotating power component guarding and shielding . 5
4.5 Overrunning clutch or freewheel device . 5
4.6 Attachment means for trailed mowers . 5
4.7 Attachment means for mounted and semi-mounted mowers . 5
4.8 Cutting elements . 6
4.9 Impact of the cutting-element assemblies . 6
4.10 Unbalance . 6
4.11 Structural integrity . 6
5 Verification of safety requirements and/or protective/risk reduction measures . 6
5.1 Test conditions - General . 6
5.1.1 Assembly . 6
5.1.2 Mower position . 6
5.1.3 Test speed . 6
5.1.4 Number of tests . 6
5.2 Foot-probe test . 7
5.2.1 Foot-probe test equipment . 7
5.2.2 Test conditions . 10
5.2.3 Test procedure . 10
5.2.4 Test acceptance . 10
5.3 Impact test for cutting-element assemblies . 10
5.3.1 Test equipment . 10
5.3.2 Test conditions . 11
5.3.3 Test procedure . 11
5.3.4 Test acceptance . 15
5.4 Unbalance test for cutting-element assemblies . 15
5.4.1 Test equipment . 15
5.4.2 Test conditions – Multi-piece cutting element assembly . 15
5.4.3 Test conditions - One-piece cutting element construction . 15
5.4.4 Test procedure . 15
5.4.5 Test acceptance . 15
5.5 Structural integrity test . 15
5.5.1 Test equipment . 15
© ISO 2023 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 4254-13:2023(E)
5.5.2 Test conditions . 16
5.5.3 Test procedure . 16
5.5.4 Test acceptance . 16
5.6 Thrown object test . 16
5.6.1 Operator zone . 16
5.6.2 Test equipment . 22
5.6.3 Test conditions . 23
5.6.4 Test procedure . 26
5.6.5 Scoring . 26
5.6.6 Test acceptance . 26
6 Information for use . 27
6.1 Operator's manual . 27
7 Marking and safety signs . 28
7.1 Marking . 28
7.2 Safety signs . 28
Annex A (informative) List of significant hazards . 30
Annex B (informative) Example of test recording forms . 32
B.1 Large rotary mower thrown-object testing recording form . 32
B.2 Structural integrity test recording form . 35
Annex C (informative) Example illustrations of mowers . 37
C.1 Examples of mowers dealt with in this document . 37
C.2 Examples of mowers not dealt with in this document . 38
Annex D (informative) Corrugated fibreboard penetration tests . 43
D.1 Purpose . 43
D.2 Test fixture . 43
D.3 Fibreboard samples . 43
D.4 Procedure. 43
D.5 Acceptance criteria . 43
Bibliography . 46
Foreword . v
Introduction . vii
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
3.1 Rotary mowers . 2
3.2 Cutting elements . 3
3.3 Thrown-object testing . 3
4 Safety requirements and/or protective/risk reduction measures . 4
4.1 General . 4
4.2 Protection against thrown objects . 5
4.3 Protection against inadvertent contact with the cutting elements. 5
4.4 Rotating power component guarding and shielding . 5
4.5 Overrunning clutch or freewheel device . 5
4.6 Attachment means for trailed mowers . 5
iv © ISO 2023 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 4254-13:2023(E)
4.7 Attachment means for mounted and semi-mounted mowers . 5
4.8 Cutting elements . 6
4.9 Impact of the cutting-element assemblies . 6
4.10 Unbalance . 6
4.11 Structural integrity . 6
5 Verification of safety requirements and/or protective/risk reduction measures . 6
5.1 Test conditions — General . 6
5.1.1 Assembly . 6
5.1.2 Mower position . 6
5.1.3 Test speed . 6
5.1.4 Number of tests . 6
5.2 Foot-probe test . 7
5.2.1 Foot-probe test equipment . 7
5.2.2 Test conditions . 10
5.2.3 Test procedure . 10
5.2.4 Test acceptance . 10
5.3 Impact test for cutting-element assemblies . 10
5.3.1 Test equipment . 10
5.3.2 Test conditions . 11
5.3.3 Test procedure . 11
5.3.4 Test acceptance . 15
5.4 Unbalance test for cutting-element assemblies . 15
5.4.1 Test equipment . 15
5.4.2 Test conditions — Multi-piece cutting element assembly . 15
5.4.3 Test conditions — One-piece cutting element construction . 15
5.4.4 Test procedure . 15
5.4.5 Test acceptance . 15
5.5 Structural integrity test . 15
5.5.1 Test equipment . 15
5.5.2 Test conditions . 16
5.5.3 Test procedure . 16
5.5.4 Test acceptance . 16
5.6 Thrown object test . 16
5.6.1 Operator zone . 16
5.6.2 Test equipment . 22
5.6.3 Test conditions . 23
5.6.4 Test procedure . 26
5.6.5 Scoring . 26
5.6.6 Test acceptance . 26
6 Information for use . 27
6.1 Operator's manual. 27
7 Marking and safety signs . 28
7.1 Marking . 28
7.2 Safety signs . 28
Annex A (informative) List of significant hazards . 30
Annex B (informative) Example of test recording forms. 32
Annex C (informative) Example illustrations of mowers . 37
Annex D (informative) Corrugated fibreboard penetration tests . 43
Bibliography . 46
© ISO 2023 – All rights reserved v
---------------------- Page: 5 ----------------------
ISO 4254-13:2023(E)
vi © ISO 2023 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 4254-13:2023(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.
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/directiveswww.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/patentswww.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.htmlwww.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 23, Tractors and machinery for
agriculture and forestry, Subcommittee SC 7, Equipment for harvesting and conservation.
This second edition cancels and replaces the first edition (ISO 4254-13:2012), which has been
technically revised.
The main changes compared to the previous edition are as follows:
— Additionaladditional information has been added to the Scope regarding applicability;
— the Normative references have been updated;
— Inin Clause 3:
— some terms and definitions have been modified, added or removed;
— former figureFigure 1 has been removed and subsequent figures have been renumbered;
— Bladeblade test and performance requirements have been moved to ISO 5718-2;
— Inin Clause 4:
© ISO 2023 – All rights reserved vii
---------------------- Page: 7 ----------------------
ISO 4254-13:2023(E)
— , subclauses 4.8, 4.9, 4.10 and 4.11 have been revised to reflect the strength and performance
requirements in the standards concerned;
— Inin Clause 5:
— title has been revised;
— figureFigure 2 (former Figure 3) has been modified;
— figureFigure 3 (former Figure 4) has been modified;
— 5.2.2.3 has been added to indicate a test condition;
— 5.3.1.4 has been modified to indicate new requirements for test equipment;
— 5.4.1.4 has been added to indicate new requirements for test equipment;
— 5.4.5 test acceptance criteria has been modified;
— 5.5.4 test acceptance criteria has been modified;
— Subclausesubclause 5.7 and succeeding subclauses have been removed;
— Subclausesubclause 5.8 and succeeding subclauses, including Table 1 and Figure 12, have been
removed;
— 5.6.2.6 has been modified to correct an error in the sand particle size requirements for test
equipment;
— the Bibliography has been updated;
— Document has been editorially revised.
A list of all parts of ISO 4254 series can be found on the ISO website.
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.htmlwww.iso.org/members.html.
viii © ISO 2023 – All rights reserved
---------------------- Page: 8 ----------------------
ISO 4254-13:2023(E)
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 (for example, safety distances, surface temperature,
noise);
— type-B2 standards on safeguards (for example, 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 12100:2010.
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.
Significant hazards that are common to all agricultural machines (self-propelled ride-on, mounted,
semi-mounted and trailed) are dealt with in ISO 4254-1.
© ISO 2023 – All rights reserved ix
---------------------- Page: 9 ----------------------
INTERNATIONAL STANDARDError! Reference source
ISO 4254-13:2023(E)
not found.
Agricultural machinery — Safety — Part 13: Large rotary
mowers
1 Scope
This document, when used together with ISO 4254-1, specifies the safety requirements and their
verification for the design and construction of towed, semi-mounted, or mounted large rotary mowers
with single or multiple cutting elements which have a cutting element tip circle of 1 000 mm or greater
for any single cutting-element assembly, mounted on a propelling tractor or machine, intended for
agricultural mowing equipment and designed for shredding crop residue, grass and small brush by
impact. 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
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.