oSIST prEN ISO 4254-18:2026

Agricultural machinery - Safety - Part 18: Forage loader wagons and forage transport wagons (ISO/DIS 4254-18:2026)

This document, intended to be used together with ISO 4254-1, specifies the safety requirements and their verification for the design and construction of
— trailed forage loader wagons,
— trailed forage cutter-loader wagons,
— trailed forage transport wagons,
— silage and forage body intended to be affixed to a carrier vehicle,
— trailers with a load push/push-off device, slats or alternating moving floor
which is intended for the use by only one person (operator). In addition, it specifies the type of information on safe working practices including residual risks to be provided by the manufacturer.
This document is not applicable to:
— self-propelled forage loader wagons, self-propelled forage cutter loader wagons and self-propelled forage transport wagons,
— trailers with a tipping body, balanced or semi-mounted, used in agriculture.

Landmaschinen - Sicherheit - Teil 18: Ladewagen und Häckseltransportwagen (ISO/DIS 4254-18:2026)

Matériel agricole - Sécurité - Partie 18: Remorques autochargeuses pour fourrage et remorques de transport de fourrage (ISO/DIS 4254-18:2026)

Kmetijski stroji - Varnost - 18. del: Nakladalne prikolice za krmo in prikolice za prevoz krme (ISO/DIS 4254-18:2026)

Ta dokument, namenjen uporabi skupaj z ISO 4254-1, določa varnostne zahteve in njihovo preverjanje za načrtovanje in izdelavo
- vlečenih vozov za nakladanje krme,
- vlečenih vozov za rezanje in nakladanje krme,
- vlečenih vozov za prevoz krme,
- silosnih in krmnih nadgradenj, namenjenih pritrditvi na nosilno vozilo,
- prikolic s potisno napravo za nalaganje/razkladanje, letvami ali izmenično gibajočim se podom,
ki so namenjeni uporabi samo ene osebe (upravljavca). Poleg tega določa vrsto informacij o varnih delovnih praksah, vključno s preostalimi tveganji, ki jih mora zagotoviti proizvajalec.
Ta dokument ne velja za:
- samohodne voze za nakladanje krme, samohodne voze za rezanje in nakladanje krme ter samohodne voze za prevoz krme,
- prikolice z nagibnim koritom, uravnotežene ali polpriklopne, ki se uporabljajo v kmetijstvu.

General Information

• Status: Not Published
• Public Enquiry End Date: 23-Jun-2026
• ICS: 65.060.01 - Agricultural machines and equipment in general
• ICS: 65.060.10 - Agricultural tractors and trailed vehicles
• Technical Committee: IMKG - Machinery for agriculture and forestry
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 09-Apr-2026
• Due Date: 27-Aug-2026
• Directive: Not Harmonized2023/1230 - Regulation (EU) 2023/1230 of the European Parliament and of the Council of 14 June 2023 on machinery and repealing Directive 2006/42/EC of the European Parliament and of the Council and Council Directive 73/361/EEC (Text with EEA relevance)
• Mandate: M/605 - COMMISSION IMPLEMENTING DECISION of 20.1.2025 on a standardisation request to the European Committee for Standardization and to the European Committee for Electrotechnical Standardization as regards machinery and related products in support of Regulation (EU) 2023/1230 of the European Parliament and of the Council
• Ref Project: prEN ISO 4254-18 - Agricultural machinery - Safety - Part 18: Forage loader wagons and forage transport wagons (ISO/DIS 4254-18:2026)

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2026
Kmetijski stroji - Varnost - 18. del: Nakladalne prikolice za krmo in prikolice za
prevoz krme (ISO/DIS 4254-18:2026)
Agricultural machinery - Safety - Part 18: Forage loader wagons and forage transport
wagons (ISO/DIS 4254-18:2026)
Landmaschinen - Sicherheit - Teil 18: Ladewagen und Häckseltransportwagen (ISO/DIS
4254-18:2026)
Matériel agricole - Sécurité - Partie 18: Remorques autochargeuses pour fourrage et
remorques de transport de fourrage (ISO/DIS 4254-18:2026)
Ta slovenski standard je istoveten z: prEN ISO 4254-18
ICS:
65.060.10 Kmetijski traktorji in prikolice Agricultural tractors and
trailed vehicles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 4254-18
ISO/TC 23/SC 7
Agricultural machinery — Safety —
Secretariat: UNI
Part 18:
Voting begins on:
Forage loader wagons and forage 2026-04-01
transport wagons
Voting terminates on:
2026-06-24
ICS: 65.060.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
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.
Reference number
ISO/DIS 4254-18:2026(en)
DRAFT
ISO/DIS 4254-18:2026(en)
International
Standard
ISO/DIS 4254-18
ISO/TC 23/SC 7
Agricultural machinery — Safety —
Secretariat: UNI
Part 18:
Voting begins on:
Forage loader wagons and forage
transport wagons
Voting terminates on:
ICS: 65.060.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
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or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
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TO SUBMIT, WITH THEIR COMMENTS,
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NOTIFICATION OF ANY RELEVANT PATENT
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Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 4254-18:2026(en)
ii
ISO/DIS 4254-18:2026(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Safety requirements and/or protective/risk reduction measures for all machines . 4
4.1 General .4
4.2 Controls .4
4.3 Stability in parking position .4
4.4 Articulated drawbar . .5
4.5 Requirements for the pick-up device .6
4.6 Requirements for the rotary mower .9
4.6.1 Protection against inadvertent contact with the cutting elements .9
4.6.2 Protection against thrown objects that are not part of the machine . .10
4.6.3 Blades .11
4.6.4 Implement hitch or carrier frame .11
4.6.5 Stop of the rotary mower when lifted from the ground . 12
4.7 Feeding elements and cutting devices . 12
4.8 Floor conveyor . 13
4.8.1 Guarding . 13
4.8.2 Adjustment of conveyor . 22
4.9 Other discharge means . 22
4.9.1 General . 22
4.9.2 Push-off device . 23
4.9.3 Moving floor .24
4.10 Access to loading space . 25
4.11 Boarding means other than access to loading space . 26
4.12 Discharging . 26
4.12.1 Beater/agitator . 26
4.12.2 Cross conveyor . 26
4.13 Discharge gate . 26
4.13.1 General . 26
4.13.2 Opening . 26
4.13.3 Closing .27
4.14 Load body extension and loading space cover . 28
4.14.1 General . 28
4.14.2 Crushing and shearing points . 28
4.14.3 Hydraulically operated load body extension . 29
4.14.4 Mechanically operated load body extension . 29
4.15 Mechanical power transmission . 29
4.16 Load body intended to be removable from the carrier vehicle . 29
5 Verification of safety requirements and/or protective/risk reduction measures .29
6 Information for use .30
6.1 Operator's manual . 30
6.1.1 General . 30
6.1.2 All machines .31
6.1.3 Push-off wagons .31
6.1.4 Cutter-loader wagons .32
6.2 Marking .32
6.2.1 General .32
6.2.2 Safety labels .32
6.2.3 Instructional signs .32
6.3 Warning and instructions .32

iii
ISO/DIS 4254-18:2026(en)
Annex A (informative) List of significant hazards .33
Annex B (informative) Examples of machines and components.38
Annex C (normative) Visibility . 41
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2006/42/EC aimed to be covered .42
Bibliography .44

iv
ISO/DIS 4254-18:2026(en)
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 on 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 the following URL:
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.
A list of all parts in the 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.

v
ISO/DIS 4254-18:2026(en)
Introduction
This document is a type-C standard as stated in ISO 12100.
This document is of relevance, in particular, for the following stakeholder groups representing the market
players with regard to machinery safety:
— machine manufacturers (small, medium and large enterprises);
— health and safety bodies (regulators, accident prevention organizations, market surveillance, etc.).
Others can be affected by the level of machinery safety achieved with the means of the document by the
above-mentioned stakeholder groups:
— machine users/employers (small, medium and large enterprises);
— machine users/employees (e. g. trade unions, organizations for people with special needs);
— service providers, e. g. for maintenance (small, medium and large enterprises);
— consumers (in the case of machinery intended for use by consumers)
The above-mentioned stakeholder groups have been given the possibility to participate at the drafting
process of this document.
The machinery concerned and the extent to which hazards, hazardous situations or hazardous events are
covered are indicated in the Scope of this document.
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 requirements of this type-C
standard.
vi
DRAFT International Standard ISO/DIS 4254-18:2026(en)
Agricultural machinery — Safety —
Part 18:
Forage loader wagons and forage transport wagons
1 Scope
This document, intended to be used together with ISO 4254-1, specifies the safety requirements and their
verification for the design and construction of
— trailed forage loader wagons,
— trailed forage cutter-loader wagons,
— trailed forage transport wagons,
— silage and forage bodies intended to be affixed to a carrier vehicle,
— trailers with a load push/push-off device, slats or alternating moving floor
which is intended for the use by only one person (operator). In addition, it specifies the type of information
on safe working practices including residual risks to be provided by the manufacturer.
This document is not applicable to:
— self-propelled forage loader wagons, self-propelled forage cutter loader wagons and self-propelled forage
transport wagons,
— trailers with a tipping body, balanced or semi-mounted, used in agriculture.
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 requirements of ISO 4254-1 for machines that have
been designed and built according to the requirements of this document.
This document, taken together with ISO 4254-1, deals with all the significant hazards, hazardous situations
and events relevant to loader wagons and forage transport wagons, when they are used as intended and
under the conditions of misuse that are reasonably foreseeable by the manufacturer (see Annex A). It is
not applicable to hazards by presence of other persons than the operator and hazards related to noise
and moving parts of the power transmission, excluding strength requirements for guards and barriers.
Requirements for remote controls are not dealt with.
This document is not applicable to machines manufactured before the date of its publication.
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 this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 3600:2015, Tractors, machinery for agriculture and forestry, powered lawn and garden equipment —
Operator’s manuals — Content and format
ISO 4254-1:2013, Agricultural machinery — Safety — Part 1: General requirements
ISO 4254-12:2012, Agricultural machinery — Safety — Part 12: Rotary disc and drum mowers and flail mowers

ISO/DIS 4254-18:2026(en)
ISO 11684:2023, Tractors, machinery for agriculture and forestry, powered lawn and garden equipment —
Safety labels — General principles
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
ISO 17101-1:2012, Agricultural machinery — Thrown-object test and acceptance criteria — Part 1: Rotary
mowers
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4254-1 and ISO 12100 and the
following apply.
3.1
forage loader wagon
machine for loading by means of an integrated pick-up device, transporting and unloading of chopped crop
Note 1 to entry: Unloading is done by a power-driven device which is integrated in the machine (for example conveyor,
pusher, moveable floor, etc.) and can include powered distribution devices (for example beater/agitator, cross conveyor
belt).
Note 2 to entry: See Figure B.1 as an example.
3.2
forage cutter-loader wagon
machine for chopping by means of an integrated rotary mower, loading, transporting and unloading of crop
Note 1 to entry: Unloading is done by a power-driven device which is integrated in the machine (for example conveyor,
pusher, moveable floor, etc.) and can include powered distribution devices (for example beater/agitator, cross conveyor
belt).
Note 2 to entry: See Figure B.2 as an example.
3.3
forage transport wagon
machine for transporting and unloading of chopped crop which is filled by means of a separate machine
Note 1 to entry: Unloading is done by a power-driven device which is integrated in the machine (for example conveyor,
pusher, movable floor, etc.) and can include powered distribution devices (for example beater/agitator, cross conveyor
belt).
Note 2 to entry: See Figure B.3 as an example.
3.4
push-off device
powered surface that moves horizontally through the loading space (3.17) to push the chopped crop
3.5
pick-up
device for gathering a cut crop and conveying it into the wagon
3.6
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
Note 1 to entry: Definition taken from ISO 4254-12:2012, 3.1

ISO/DIS 4254-18:2026(en)
3.7
articulated drawbar
device used to connect the machine to the tractor that is adjustable to adapt the position of the machine to
the working conditions
3.8
floor conveyor
powered device integrated in the bottom of the load body (3.18), consisting of a non-rigid tension device that
is pulled around at least one sprocket/roller for the purpose of moving the chopped crop
3.9
moving floor
bottom of the load body (3.18) that is movable for the purpose of moving the chopped crop
3.10
beater/agitator
powered tool for the purpose of distribution of chopped crop
3.11
service door
device that allows access for operator to the loading space for maintenance, inspection and cleaning
3.12
discharge gate
moveable device that is part of the load body (3.18) and which can be opened to unload the machine
3.13
entry point
location where the conveyor engages a sprocket/roller
3.14
cross conveyor
powered device for unloading of chopped crop in a direction perpendicular to the direction of travel of the
machine
3.15
load body extension
Movable portion of the load body (3.18) that increases the loading space (3.17)
3.16
feeding element
device between the pick-up or the rotary mower and the loading space that transfers the crop from the pick-
up or the rotary mower to the loading space (3.17)
EXAMPLE stuffer, rotor
Note 1 to entry: These devices can convey the material towards the centre of the machine (for example, auger).
3.17
loading space
volume that is intended to contain chopped crop
3.18
load body
physical structure that establishes the loading space (3.17)

ISO/DIS 4254-18:2026(en)
4 Safety requirements and/or protective/risk reduction measures for all machines
4.1 General
4.1.1 Machinery shall comply with the safety requirements and/or protective/risk reduction measures of
this clause.
4.1.2 In addition, the machine shall be designed in accordance with the principles of ISO 12100:2010,
clause 4, for hazards relevant, but not significant, which are not dealt with by this part of ISO 4254.
4.1.3 The compliance with the safety requirements and / or protective/risk reduction measures shall be
verified in accordance with clause 5.
4.1.4 Unless 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 13857:2019.
4.2 Controls
4.2.1 Controls shall be located such that the operator cannot reach them when inside the loading space.
4.2.2 Controls shall be located such that the operator cannot reach unguarded moving working tools while
the control(s) are being actuated.
4.2.3 Controls for machines where actuation from the driver's seat is required shall be designed so that
the operator can reach them, for example, by means of adjustable position of the controls or possibility of
installation inside the tractor.
4.2.4 Unintentional actuation of the controls shall be avoided by design, location or other means.
4.2.5 The requirements of 4.5 of ISO 4254-1:2013 apply.
4.2.6 In addition, at least one of the following steps shall be taken in the given order, with respect to the
function of the machine:
— the distance between manual controls and hazardous zones of the machine shall be ≥ 850 mm; or
— the actuation of the controls shall require 2 hands and the controls shall be hold-to-run type; or
— a disconnect device shall be provided to disengage power from all moving mechanisms, after the primary
power input. The disconnect device shall be readily accessible from the manual controls. Following
activation of the disconnect device, reengagement of power shall require an intentional action at a
location ≥ 850 mm from the manual controls.
4.3 Stability in parking position
4.3.1 For the stability in parking position, the requirements of 6.2.1 of ISO 4254-1:2013 apply.
4.3.2 Safe means shall be provided to prevent the machine from rolling away when parked.

ISO/DIS 4254-18:2026(en)
4.4 Articulated drawbar
4.4.1 Crushing and shearing points in the area of the articulated drawbar shall be protected by at least
one of the following methods:
— safety distances are maintained according to the requirements of ISO 13857:2019, Tables 1, 3, 4 and 6 as
appropriate;
— in any position of the traversable stroke of the articulated drawbar:
— parts moving toward fixed parts maintain a safety distance of ≤ 8 mm or ≥ 25 mm; and
— parts shearing past each other maintain an angle α of ≥ 30° or a safety distance of ≥ 25 mm (see
Figures 1 and 2).
Key
1 ball-type coupling device
2 drawbar
3 angle of yaw limiter
4 hydraulic hose retainer
5 connection point drawbar – frame (pivot point)
6 articulated drawbar cylinder
7 vehicle body
8 crushing point
9 shearing point
Figure 1 — Articulated drawbar – Side view

ISO/DIS 4254-18:2026(en)
Key
1 articulated drawbar
2 connection bolt articulated drawbar – frame (pivot point)
3 vehicle body
Figure 2 — Articulated drawbar – Top view
4.4.2 The articulated drawbar shall be protected against unintentional activation according to 4.11 of
ISO 4254-1:2013 in order to avoid lowering of the vehicle for example, during maintenance work.
4.5 Requirements for the pick-up device
4.5.1 Protection against inadvertent contact with the pick-up device shall be provided by parts of the
machine, guards, barriers or a combination of these. The position of parts which may be adjustable shall
always remain within the limits specified in 4.5.2. The projection on a horizontal plane of these protective
devices shall be continuous.
4.5.2 When the pick-up device is in the working position as defined in the operator's manual, these
barriers shall be positioned as follows:
— the front barrier in a horizontal distance of at least 230 mm in front of the most forward point of the tine
path and in a height h > 500 mm above the ground (see Figure 3a), or the horizontal distance of at least
100 mm if the height h ≤ 500 mm (see Figure 3b). The front barrier is not required if a part of the machine
fulfils this function (i.e. deflector plate, role with reels);
— the lateral barrier in a horizontal distance of at least 150 mm from the sides of the tine path and a height
no more than 500 mm above the ground of (see Figure 3). The lateral barrier is not required if a part of
the machine fulfils this function (i.e. contact wheel, see Figure 5) or if the tine path is totally covered by
a part of the machine when viewed from the side, as defined and shown in Figure 4.
4.5.3 When the pick-up device is in the working position, side guards, if fitted, shall be located in
accordance with Figure 4.
ISO/DIS 4254-18:2026(en)
Dimensions in Millimetres
a)
b)
Key
1 front barrier
2 lateral barrier
3 tine path
Figure 3 — Protection of pick-up device by a combination of barriers

ISO/DIS 4254-18:2026(en)
Dimensions in Millimetres
Key
1 guard or fixed part of the machine
2 barrier
3 tine path
NOTE This figure illustrates an example of protective devices complying with 4.5.2.
Figure 4 — Lateral guarding of the pick-up device by a combination of barriers and fixed guards or
parts of the machine
ISO/DIS 4254-18:2026(en)
a) side view
b) front view
Figure 5 — Example of lateral guarding of pick-up device by combination of barriers and lateral
guide wheels
4.6 Requirements for the rotary mower
4.6.1 Protection against inadvertent contact with the cutting elements
The requirements of ISO 4254-12:2012, 5.2.1 and 5.2.1.1 apply. It is permissible for parts of the trailed
cutter-loader wagons (e.g. loading body) to be used in place of guards and barriers provided that they offer
an equivalent level of protection.

ISO/DIS 4254-18:2026(en)
4.6.2 Protection against thrown objects that are not part of the machine
4.6.2.1 The requirements of ISO 4254-12:2012, 5.3 apply, taking into account the following.
4.6.2.2 The target panels shall be configurated for trailed cutter-loader wagons according to
ISO 17101-1:2012, 4.2.6, with the following modification. The rear panel (panel 3 in Figure 6 of
ISO 17101-1:2012) must be spilt in two different panels (3a and 3b), each of them connecting to the other
panel on one side (panel 2 and panel 4, respectively) and extending on the other side up to 200 mm to the
outermost part of the trailed cutter-loader wagon, located in the longitudinal and vertical portion of the
trailed cutter-loader wagon that needs to pass through the panels during the test, see Figure 6.

ISO/DIS 4254-18:2026(en)
Dimensions in Millimetres
Key
A test material
B rotary mower's tool path
3 600 mm or 800 mm (see 4.2.2 of ISO 17101-1:2012)
— panels (1, 2, 3a, 3b, 4, 5, 7)
Figure 6 — Target panel configuration for trailed cutter-loader wagons
4.6.3 Blades
The requirements of ISO 4254-12:2012, 5.7 apply.
4.6.4 Implement hitch or carrier frame
The requirements of ISO 4254-12:2012, 5.9 apply.

ISO/DIS 4254-18:2026(en)
4.6.5 Stop of the rotary mower when lifted from the ground
4.6.5.1 When the rotary mower is in transport position, the power to it shall automatically disconnect.
4.6.5.2 Only for those trailed cutter-loader wagons where there is a rigid connection between the loading
body and the rotary mower and no articulation is possible between these two elements, a manual control to
stop the mower and located on the mower is acceptable.
4.6.5.3 If exposure is possible to elements that continue to rotate or move after the power is disengaged,
there shall be evidence of rotation or an audible indication of rotation or a suitable safety sign. There shall be
instruction in the operator's manual stating the need to wait until all movement is stopped before servicing
or swinging components into transport position.
4.7 Feeding elements and cutting devices
4.7.1 Crushing and shearing points located at a distance of less than 230 mm from the outer limit of the
machine or from the extreme edges of the feeding channel shall be guarded against inadvertent contact and
shall meet the requirements as defined in ISO 13857. In case the elements to convey the crop laterally are
designed as augers, the guard above the auger shall extend forward from the rear of the auger to at least the
longitudinal axis of the auger as shown in Figure 7. Devices other than augers shall be guarded on top in a
comparable manner to meet the requirements as specified in ISO 13857.
4.7.2 A lateral fixed guard partially covering the auger and a distance barrier, in combination with
barriers as defined in 4.5, are deemed to meet the requirements of 4.7 when the dimensions of Figure 7 are
respected.
4.7.3 Principles of safety and ergonomics shall be incorporated to reduce the risk of harm while changing
knives by providing
— the knives can be removed without use of tools, if the operator has to stay underneath the machine for
this purpose. This requirement does not apply for the central locking/unlocking of the knives from the
side of the machine and the use of means for avoiding of cutting hazards when removing the knife;
Note In other situations, the use of a tool is allowed for the removal of the knives.
or
— it is possible to swivel the cutter bar towards the side of the machine.
Specific instructions on the procedures to be followed for the changing as well as sharpening of knives shall
be given in the operator's manual [see 6.1 q)].

ISO/DIS 4254-18:2026(en)
Dimensions in Millimetres
Key
1 lateral barrier of conveying and cutting device
2 front barrier of pick-up
3 lateral barrier of pick-up
4 lateral fixed separating guard
5 rear covering above auger
6 feeding auger
7 pick-up
Figure 7 — Guarding of the feeding elements
4.8 Floor conveyor
4.8.1 Guarding
4.8.1.1 General
4.8.1.1.1 For conveyors, the access to shearing and crushing points shall be prevented by means of design
or fixed guards.
ISO/DIS 4254-18:2026(en)
4.8.1.1.2 If due to functional reasons, there is still access to shearing and crushing points, the clauses 4.8.1.2
to 4.1.8.4 shall be fulfilled as appropriate.
4.8.1.2 Moving path of conveyor
4.8.1.2.1 The moving path of the conveyor below the load body shall be covered at the front and at the
sides over its entire length, see Figure 8.
4.8.1.2.2 Below the load body the distance between the conveyor slats or conveyor belt and the fixed parts
of the machine located in the transverse direction to the moving direction of the conveyor (for example
frame or slats) except for guiding elements of the conveyor slats or the conveyor belt provided that they do
not generate shearing or crushing hazards shall be at least 25 mm, see Figure 9.
4.8.1.2.3 This minimum gap of 25 mm shall be maintained after foreseeable slackening of the conveyor
during use. The shape of the lateral guard shall take into account the possible slackening of the conveyor
during use.
4.8.1.2.4 Remaining shearing and crushing points between the conveyor and fixed parts of the machine
which cannot be avoided for functional reasons shall be identified. Such shearing and crushing points shall
be identified by safety labels on the machine where foreseeable access could be gained to these shearing
and crushing points. The safety labels and their position on the machine shall be indicated in the operator's
manual (see 6.1 f)).
ISO/DIS 4254-18:2026(en)
Key
1 area to be guarded at the front
2 area to be guarded at the sides
3 moving direction of conveyor (upper and lower strand)
Figure 8 — Guarding of moving path of conveyor
a) side view
ISO/DIS 4254-18:2026(en)
b) perspective view
Key
1 fixed part of the machine – part(s) of the frame
2 fixed part of the machine - chassis
3 lower strand of conveyer
4 moving direction of the conveyor (upper and lower strand)
5 guiding elements for the conveyor
Figure 9 — Guarding of the conveyor below the body – side view
4.8.1.3 Conveyor with slats
4.8.1.3.1 Non-discharge turning points
4.8.1.3.1.1 Shearing and crushing points at a distance of less than 850 mm from the outer contour of the
machine, which are directly accessible from the side of the machine shall be guarded at the non-discharge
turning points.
4.8.1.3.1.2 If direct access to the non-discharge turning points is possible, the horizontal distance between
the foremost point of the front of the moving path of the conveyor and the fixed parts of the machine shall be
at least 100 mm, see Figure 10, a).
4.8.1.3.1.3 If access to the non-discharge turning points is only possible indirectly (for example by
circumventing a guard), the horizontal distance between the foremost point of the moving path of the
conveyor and the fixed parts of the machine may be minimized to 25 mm. In this case, the lower guard shall
extend rearwards from the fixed parts at least to the vertical plane through the axle of the chain sprocket
axle / deflection rolls. The distance between the moving path of the conveyor and the guard shall be at least
100 mm. The distance of 100 mm from the outer moving path of the conveyor to the guard shall at least be
provided over a length of 130 mm from the rearward edge of the guard, see Figure 10, b).

ISO/DIS 4254-18:2026(en)
4.8.1.3.1.4 When operating in the unloading direction, the areas at the turning points of the conveyor
where the chains run onto a sprocket or deflection roll shall be guarded. The guard shall prevent direct
access to the crushing zones.
4.8.1.3.1.5 As far as a reverse movement of the conveyor is possible, the upper entry point of the conveyor
inside the load body shall be guarded along its width. This does not apply if the machine is equipped with a
hold-to-run control for the reverse operation of the conveyor.
4.8.1.3.1.6 Shearing and crushing hazards which may occur during contact of the conveyor slats with the
loading platform or the guide plates at the turning points and which could not be avoided due to functional
reasons shall be identified by safety labels on the machines where foreseeable access could be gained to
these shearing and crushing points. The safety labels and their position on the machine shall be indicated in
the operator's manual (see 6.1 e)).
Dimensions in mm
a) Guarding at direct access
ISO/DIS 4254-18:2026(en)
b) Guarding at indirect access
Key
1 fixed part of the machine (i.e. body or slats)
2 outer moving path of the conveyer
3 moving direction of the conveyor
4 guard
5 rearward edge of the guarding
Figure 10 — Guarding of the conveyor at the non-discharge turning points
4.8.1.3.2 Discharge turning points
4.8.1.3.2.1 Shearing and crushing points at a distance of less than 850 mm from the outer lateral edge of
the machine which are directly accessible shall be guarded at the discharge turning points. This guarding
can be achieved by guide plates that have a clearance between the guide plate and the slats of no more than
8 mm at the area of the turning leave. The maximum clearance of 8 mm shall be maintained by 120° to the
rear of a vertical axis through the centre of the sprocket, see item 1 of key to Figure 11.

ISO/DIS 4254-18:2026(en)
4.8.1.3.2.2 When operating in the unloading direction, the areas at the turning points of the conveyor
where the chains run onto a sprocket or deflection roll shall be guarded. The guard shall prevent direct
access to the crushing zones.
4.8.1.3.2.3 As far as a reverse movement of the conveyor is possible, the lower entry point of the conveyor
below the load body shall be guarded along its width. This does not apply if the machine is equipped with a
hold-to-run control for the reverse operation of the conveyor.
4.8.1.3.2.4 Shearing and crushing hazards which may occur during contact of the conveyor slats with the
loading platform or the guide plates at the turning points and which could not be avoided due to functional
reasons shall be identified by safety labels on the machines where foreseeable access could be gained to
these shearing and crushing points. The safety labels and their position on the machine shall be indicated in
the operator's manual (see 6.1 e)).
Dimensions in mm
Key
1 guide plate
2 moving direction of the conveyor (upper or lower strand)
3 entry point
Figure
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