prEN ISO 4254-19
(Main)Agricultural machinery - Safety - Part 19: Feed mixing machines (ISO/DIS 4254-19:2023)
Agricultural machinery - Safety - Part 19: Feed mixing machines (ISO/DIS 4254-19:2023)
This document, used together with ISO 4254-1, specifies the safety requirements and their verification
for the design and construction of mounted, semi-mounted, trailed or self-propelled machines that have a combination of two or more of the following functions: loading, mixing, chopping and distributing
silage and/or other feedstuffs or materials used for animal bedding such as straw, to be used by one
operator only. It includes those fitted with a built-in loading crane. In addition, it specifies the type of
information on safe working practices to be provided by the manufacturer.
Landmaschinen - Sicherheit - Teil 19: Futtermischwagen (ISO/DIS 4254-19:2023)
Dieses Dokument, gemeinsam mit ISO 4254 1 angewendet, legt die sicherheitstechnischen Anforderungen und deren Überprüfung fest für Gestaltung und Konstruktion von Futtermischwagen (z. B. Futtermischern, Ballenverarbeitern, Siloblockschneidern). Futtermischwagen können stationäre, angebaute, aufgesattelte, austauschbare, gezogene oder selbstfahrende Maschinen sein, die eine Kombination aus zwei oder mehr der folgenden Funktionen haben: Laden, Mischen, Zerkleinern und Verteilen von Materialien, die für Tierfutter oder Einstreu verwendet werden. Zusätzlich legt dieses Dokument die Informationen über sicheres Arbeiten fest, die vom Hersteller zur Verfügung zu stellen sind.
Dieses Dokument gilt nicht für:
— Maschinen, die das Erntegut direkt vom Feld aufnehmen;
— Ladekrane, die nicht an einen Futtermischwagen angeschlossen sind;
— autonome Futtermischwagen (einschließlich robotergestützter Zuführsysteme, die in ISO 3991 (in Vorbereitung) behandelt werden).
Dieses Dokument behandelt die signifikanten Gefährdungen, Gefährdungssituationen und Gefährdungsereignisse von Maschinen zum Laden, Mischen und/oder Zerkleinern und Verteilen von Silage und/oder anderen Futtermitteln, wenn sie wie beabsichtigt und unter den vom Hersteller vorgesehenen Bedingungen verwendet werden (siehe Anhang A), mit Ausnahme der Gefährdungen durch:
— Ausfall des Steuerungssystems;
— ungeeigneten Sitz;
— ungeeignete Beleuchtung;
— Verfahren der Maschine in Bezug auf Verkehrssicherheit;
— Bruch von mit hoher Geschwindigkeit rotierenden Teilen;
Es gilt nicht für Umweltgefährdungen (ausgenommen Geräusche).
Dieses Dokument gilt nicht für Maschinen, die vor dem Datum der Veröffentlichung dieses Dokuments hergestellt wurden.
Anhang B zeigt Beispiele von den in diesem Dokument definierten Maschinen und Bauteilen.
Matériel agricole - Sécurité - Partie 19: Machines de mélange des aliments (ISO/DIS 4254-19:2023)
Kmetijski stroji - Varnost - 19. del: Stroji za mešanje krme (ISO/DIS 4254-19:2023)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2023
Kmetijski stroji - Varnost - 19. del: Stroji za mešanje krme (ISO/DIS 4254-19:2023)
Agricultural machinery - Safety - Part 19: Feed mixing machines (ISO/DIS 4254-19:2023)
Landmaschinen - Sicherheit - Teil 19: Futtermischwagen (ISO/DIS 4254-19:2023)
Matériel agricole - Sécurité - Partie 19: Machines de mélange des aliments (ISO/DIS
4254-19:2023)
Ta slovenski standard je istoveten z: prEN ISO 4254-19
ICS:
65.060.99 Drugi kmetijski stroji in Other agricultural machines
oprema and equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT INTERNATIONAL STANDARD
ISO/DIS 4254-19.2
ISO/TC 23/SC 3 Secretariat: DIN
Voting begins on: Voting terminates on:
2023-06-16 2023-08-11
Agricultural machinery — Safety —
Part 19:
Feed mixing machines
Matériel agricole — Sécurité —
Partie 19: Machines de mélange des aliments
ICS: 65.060.99
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
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WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 4254-19.2:2023(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
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NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023
ISO/DIS 4254-19.2:2023(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 4254-19.2
ISO/TC 23/SC 3 Secretariat: DIN
Voting begins on: Voting terminates on:
Agricultural machinery — Safety —
Part 19:
Feed mixing machines
Matériel agricole — Sécurité —
Partie 19: Machines de mélange des aliments
ICS: 65.060.99
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2023
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
NOT BE REFERRED TO AS AN INTERNATIONAL
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NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 4254-19.2:2023(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
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NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
ii
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023
ISO/DIS 4254-19.2:2023(E)
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 .3
4.1 General . 3
4.2 Machine controls . 4
4.2.1 Controls located on the workstation or in the operator’s station . 4
4.2.2 Remote controls . 4
4.2.3 Emergency stop . 4
4.3 Visibility . 4
4.3.1 Visibility of work areas of cutting, loading and cutting/loading devices . 4
4.4 Loading devices . 8
4.4.1 General . 8
4.4.2 Loading door . 9
4.5 Cutting devices . 9
4.5.1 General . 9
4.5.2 Stopping time. 10
4.5.3 Maintenance and repair . 10
4.5.4 Blockages. 11
4.6 Mixing/chopping device . 11
4.6.1 Guarding for a machine equipped with cutting, loading, or cutting/loading
tools . . 11
4.6.2 Guarding for a machine equipped with gravity discharge . 11
4.6.3 Guarding for a machine equipped with distribution device . 14
4.7 Mixing/chopping chamber . 14
4.7.1 Viewing inside chamber. 14
4.7.2 Reducing material build-up . 15
4.7.3 Manual addition of material . 15
4.7.4 Maintenance and repair . 15
4.8 Moving floor . 16
4.9 Distribution device . 16
4.9.1 General . 16
4.9.2 Conveyors . 16
4.9.3 Augers . 17
4.9.4 Distributor cylinders . 18
4.9.5 Impellers . 18
4.10 Scale display. 21
4.11 Noise . 22
4.11.1 Noise reduction as a safety requirement .22
4.11.2 Verification of requirements on noise . 22
4.12 Stability and immobilization . 22
4.12.1 General .22
4.12.2 Supporting devices .22
4.12.3 Hitch loading . 23
4.13 Remote control . 23
4.14 Electro-magnetic compatibility (EMC) . 23
5 Verification of the safety requirements and/or protective risk reduction measures .23
6 Information for use .24
6.1 Operator's manual . 24
6.1.1 General . 24
iii
ISO/DIS 4254-19.2:2023(E)
6.1.2 Preparing the machine. 25
6.1.3 Operating the machine . 25
6.1.4 Servicing and maintaining the machine . . 26
6.1.5 Noise . 26
6.2 Marking . 26
6.2.1 General . 26
6.2.2 Safety signs . 26
Annex A (informative) List of significant hazards .28
Annex B (informative) Examples of machines and components.31
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2006/42/EC aimed to be covered .42
Bibliography .45
iv
ISO/DIS 4254-19.2:2023(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 3, Safety and comfort.
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 4254-19.2:2023(E)
Introduction
This document is a type-C standard as stated in ISO 12100:2010.
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 organisations, 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 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.
NOTE Examples of machine and components, illustrating the terms and definitions in Clause 3, are given in
Annex B.
vi
DRAFT INTERNATIONAL STANDARD ISO/DIS 4254-19.2:2023(E)
Agricultural machinery — Safety —
Part 19:
Feed mixing machines
1 Scope
This document, used together with ISO 4254-1, specifies the safety requirements and their
verification for the design and construction of feed processing machines (for example feed mixers,
bale processors, silage block cutters). Feed processing machines can be stationary, mounted, semi-
mounted, interchangeable towed or self-propelled machines that have a combination of two or more of
the following functions: loading, mixing, chopping and distributing materials used for animal feed or
bedding. In addition, it specifies the type of information on safe working practices to be provided by the
manufacturer.
This document does not apply to:
— machines which pick up crop material directly from the field;
— loading cranes not attached to a feed processing machine;
— Autonomous feed processing machines (including robotic feed systems dealt with in ISO 3991
(under preparation))
This document deals with the significant hazards, hazardous situations and events relevant to machines
for loading, mixing and/or chopping and distributing silage and/or other feedstuffs, when they are used
as intended and under the conditions foreseen by the manufacturer as listed in Annex A, except for the
hazards arising from:
— failure of the control circuit;
— inadequate seating;
— inadequate lighting;
— travelling of machinery related to road safety;
— break-up of parts rotating at high speed;
It is not applicable to environmental hazards (except noise).
This document is not applicable to machines manufactured before the date of publication of this
document.
Examples of machines and components covered by this document are shown in Annex B.
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/DIS 4254-19.2:2023(E)
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13851:2019, Safety of machinery — Two-hand control devices — Principles for design and selection
ISO 13857:2019, Safety of machinery — Safety distances to prevent hazard zones being reached by upper
and lower limbs
ISO 15817:2012, Earth-moving machinery — Safety requirements for remote operator control systems
3 Terms and definitions
For the purposes of this document, the following terms and definitions given in ISO 12100:2010 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
Machines
3.1.1
feed processer
machine with a chamber and powered mixing/chopping device(s) for blending of feed stocks and
supplements, and a means for dispensing the blended material
Note 1 to entry: The mixing/chopping devices can consist of, but are not limited to, rotating augers, rotors (for
example paddles, ribbons, bars, knives), or a combination of augers and rotors.
3.1.2
bale processor
device with an open-top chamber and powered chopping elements intended to chop baled materials
and distribute the processed material
3.1.3
silage block cutter
device with cutting edge(s) that is used to cut a block of material from the remaining material and
transport the material for processing or distribution while maintaining the material density and form
3.2
Functions
3.2.1
mixing
operation to blend two or more different materials to create a mixture
3.2.2
chopping
operation to break up or reduce the size of the constituent elements of a mass of material
3.2.3
cutting
operation to sever a portion of material from the remaining material
3.3
loading device
element or set of elements attached to the machine that moves material into the chamber
ISO/DIS 4254-19.2:2023(E)
3.3.1
loading crane
powered crane, attached to the machine, comprising a column, which pivots about a base, and a boom
system which is attached to the top of the column for loading material into the chamber
[SOURCE: EN 12999:2011, definition 3.1.1 modified]
3.3.2
loading door
moveable portion of the chamber that opens to serve a loading function of the machine and closes
during mixing or processing of material
3.3.3
loading conveyor
powered mechanism that continually moves material into the chamber
3.4
cutting/loading device
element or set of elements attached to the machine that alone or in combination, serve the functions of
a cutting device and a loading device.
3.5
mixing/chopping device
element or set of elements that performs the mixing and/or chopping function(s) on the material in the
chamber
3.6
cutting device
element or set of elements attached to the machine that performs the cutting function
3.7
distribution device
powered element or set of elements, attached to the machine, which moves the material from the
chamber to a desired location (for example conveyor, belt, auger, distributor cylinder, impeller, blower)
3.8
unloading door
moveable portion of the chamber that opens to unload material
3.9
moving floor
powered conveyor for moving the material within the chamber or on the loading door
3.10
workstation
position on the machine, other than the operator's station, from which control of at least some machine
functions is possible
3.11
operator's station
position of the operator during machine operations including transport
4 Safety requirements and/or protective risk reduction measures
4.1 General
4.1.1 Machinery shall comply with the safety requirements or protective risk reduction measures of
this clause. In addition, the machine shall be designed according to the principles of relevant parts of
ISO 12100 for hazards relevant but not significant, which are not dealt with by this document.
ISO/DIS 4254-19.2:2023(E)
4.1.2 Unless otherwise specified in this document, the machines shall comply with the requirements
of ISO 4254-1 and with ISO 13857:2019, Table 1, Table 3, Table 4 and Table 6 as appropriate.
4.2 Machine controls
4.2.1 Controls located on the workstation or in the operator’s station
4.2.1.1 Controls shall be designed so that the operator can reach them where intended, for example
by means of an adjustable position.
4.2.1.2 It shall not be possible for the operator to reach unguarded moving working elements while
actuating the control.
4.2.1.3 It shall not be possible to reach the manual controls from inside the mixing/chopping
chamber(s).
4.2.1.4 Stop controls shall have priority over all other controls.
4.2.1.5 Workstation controls shall be hold-to-run.
4.2.1.6 It shall be possible to deactivate workstation functions to limit control to the operator’s
station only.
4.2.1.7 Two-hand controls shall comply with ISO 13851.
4.2.2 Remote controls
Remote operator-controlled machinery shall comply with the requirements as specified in ISO 15817.
4.2.3 Emergency stop
An emergency stop control according to ISO 4254-1:2013, 4.19 shall be installed on self-propelled
machines
4.3 Visibility
4.3.1 Visibility of work areas of cutting, loading and cutting/loading devices
4.3.1.1 For work area at front of the machine
The operator shall have visibility of the work area at the front of the machine from the operator’s station
and/or the workstation.
The width of the work area is the entire width of any cutting, loading, and cutting/loading devices,
including any entrapment zones.
The height of the work area extends from the highest working position of any cutting, loading, and
cutting/loading devices to a height of 1 m or less from the ground when the machine is in its loading
position.
The location of the work area is 200 mm measured from the edge of any cutting, loading, and cutting/
loading devices (see Figure 1). If direct visibility cannot be achieved, devices such as mirrors or closed-
circuit television (CCTV) shall be used to ensure indirect visibility.
ISO/DIS 4254-19.2:2023(E)
Dimensions in millimetres
Key
1 eye position
2 cutting/loading device
3 visibility zone
Figure 1 — Checking of the direct visibility of a self-propelled machine
4.3.1.2 For work area at rear of the machine
The operator shall have visibility of the work area at the rear of the machine from the operator’s station
and/or the workstation.
The width of the work area is the entire width of any cutting, loading, and cutting/loading devices,
including any entrapment zones [see d2 of Figure 2b) and 2d)].
The height of the work area extends from the highest working position of any cutting, loading, and
cutting/loading devices to a height of 1,5 m or less from the ground when the machine is in its loading
position.
NOTE The height of 1,5 m is under further investigation and could be replaced by 1,0 m in the future.
The location of the work area is 200 mm to the rear of:
— the edge of any cutting, loading, and cutting/loading devices;
— the machine when the loading door is closed.
If direct visibility of the work area cannot be achieved, at least one of the following shall be achieved:
— indirect visibility through the use of devices such as mirrors or closed-circuit television (CCTV)
and a sound and/or light signal emitted during actuation of cutting, loading, and cutting/loading
devices; or
— a device(s) to detect persons in the hazard zone and inform the operator.
ISO/DIS 4254-19.2:2023(E)
4.3.1.3 For work areas at sides of machine
The operator shall have visibility of the work area at the side of the machine from the operator’s station
and/or the workstation.
The width of the work area is 200 mm measured from the sides of any cutting, loading, and cutting/
loading devices of the machine [see d4 in Figures 2b) and 2d)].
The height of the work area extends from the highest working position of any cutting, loading, and
cutting/loading devices to a height of 1,5 m or less from the ground when the machine is in its loading
position.
The location of the work area is 200 mm to the rear of:
— the edge of any cutting, loading, and cutting/loading devices; or
— the machine when the loading door is closed.
If direct visibility of the work area cannot be achieved, at least one of the following shall be achieved:
— indirect visibility through the use of devices such as mirrors or closed-circuit television (CCTV)
and a sound and/or light signal emitted during actuation of cutting, loading, and cutting/loading
devices;
— a device(s) to detect persons in the hazard zone and inform the operator.
Verification: shall be by measurement on an empty machine.
4.3.1.4 Operator’s eye position
The position of the operator’s eye is defined as shown in Figure 1 and Figure 3. A lateral displacement of
the eye of the operator is allowed within ±300 mm from the centre position.
a) Checking of the visibility for trailed machines with loading door - side view
ISO/DIS 4254-19.2:2023(E)
b) Checking of the visibility for trailed machines with loading door – top view
c) Checking of the visibility for trailed machines with cutting/loading tools – side view
d) Checking of the visibility for trailed machines with cutting/loading tools
Key
h highest position to a minimum height of 1,5 m from the ground of the work area of the cutting/loading tools
and the loading door
d width of the loading tools
d width of the visibility area - interior width of the machine
d excluded width of the visibility area (sides of the machine)
d width of the visibility area on sideways = 200 mm
d length of the visibility area to rear = 200 mm
Figure 2 — Checking of the visibility for trailed machines
ISO/DIS 4254-19.2:2023(E)
Dimensions in millimetres
Key
1 eye position
2 clevis or hook
3 ground
a) case of clevis or hook-type connection between trailed machine and tractor
Key
1 eye position
2 lower hitch point
3 ground
b) case of lower hitch point connection between trailed machine and tractor
Figure 3 — determination of the conventional eye position
4.4 Loading devices
4.4.1 General
4.4.1.1 To avoid unexpected movement of the loading device during maintenance and transport,
locking devices complying with ISO 4254-1:2013, 4.11 shall be provided. If a mechanical support is
used, it shall not be detachable from the machine.
ISO/DIS 4254-19.2:2023(E)
4.4.1.2 A means shall be provided to prevent the loading device from moving without being actuated
during maintenance and transport, (for example, a pilot-operated check valve).
4.4.1.3 The controls of loading devices shall be hold-to-run if outside of the operator's station, except
for the rotation of loading conveyors, which may be hold-to-run or require an intentional action.
4.4.2 Loading door
4.4.2.1 When the loading door is open, at least one of the following measures shall be taken to protect
the operator against contact, entanglement and drawing-in hazards generated by the mixing/chopping
device(s).
— the mixing/chopping device shall not operate; or
— the mixing/chopping device shall only operate by a hold-to-run control; or
— the safety distances established in ISO 13857:2019, Tables 1, 3, 4 and 6 shall be maintained by an
automatically deployed protective device (for example, moveable interlocked wall).
4.4.2.2 To ensure the protection of the operator against crushing and shearing hazards related to a
failure of the hydraulic circuit, the door shall be fitted with a device to prevent unintended lowering
(for example, pilot-operated check valve).
4.4.2.3 A machine with a loading door that rises to close (the type of machine illustrated in Figure B.9
of Annex B) shall allow the operator to remove the net wrap or strings from a bale after it has been
loaded:
— without entering the mixing/chopping chamber; and
— without operating the mixing/chopping device.
4.5 Cutting devices
4.5.1 General
4.5.1.1 The controls of cutting devices shall require an intentional action.
4.5.1.2 Cutting devices that pose a hazard when not in use shall be guarded, either
— by location, such as making possible and instructing the operator to position the cutting device(s)
out of reach. The repositioning of the cutting device(s) shall be possible from the operator’s station.
or
— directly with a guard that prevents inadvertent contact with the cutting device(s). The guard shall
be self-closing or actuated from the operator’s station.
In case of rotating cutting devices, the front guard shall be self-closing and shall extend on the working
" by front at least 110° from the vertical to the cutting device axis (see Figure 4), with the machine in
travelling position.
ISO/DIS 4254-19.2:2023(E)
Key
1 front guard
α ≥ 110°
Figure 4 — Protection of rotating tools when not in use
4.5.2 Stopping time
4.5.2.1 General
4.5.2.1.1 The stopping time is the time from the moment the control device is switched to the off
position until the cutting device has come to a complete stop.
4.5.2.2 Requirements
4.5.2.2.1 The stopping time of cutting device(s) shall not exceed 5 seconds for self-propelled machines
and 10 seconds for other machines.
4.5.2.2.2 It shall not be possible to reach unguarded cutting elements during the run-down time.
4.5.2.3 Measurement conditions
4.5.2.3.1 The cutting device shall not be under load.
4.5.2.3.2 The speed for the test shall be the nominal rotation speed as specified by the manufacturer.
4.5.2.3.3 If the cutting device is hydraulically driven the hydraulic oil temperature during the test
shall be (65 ± 5) °C.
4.5.3 Maintenance and repair
4.5.3.1 To avoid inadvertent lowering of the cutting device during maintenance and repair, locking
devices complying with ISO 4254-1:2013, 4.11 shall be provided. If a mechanical support is used, it shall
not be detachable from the machine.
4.5.3.2 Cutting devices shall be moveable as required for maintenance and repair without operating
the machine.
ISO/DIS 4254-19.2:2023(E)
4.5.3.3 Cutting devices shall be lockable as required for maintenance and repair without operating
the machine.
4.5.4 Blockages
4.5.4.1 General
4.5.4.1.1 The machines shall be designed and built to minimize the probability and frequency of
blockages and to prevent a hazard arising should clearance of blockages become necessary.
4.5.4.1.2 This general requirement shall be achieved by the following risk reduction measures:
a) as far as practicable, avoid the need to approach the danger zone by providing means to allow
clearing of blockages without interrupting the power to the machine, either from the operator's
station or, if the normal operation is controlled from workstation, from the workstation. Such
means are for example:
— device to enlarge the section of passage of the material;
— reverse direction of the appropriate machine elements, independently from the cutting tools.
b) if a) is not fully achievable, assist in the clearing of blockages and cleaning after the machine is
stopped, by means of, for example:
— freewheel of the cutting tool axle to allow manual rotation without external power;
— hand tools to remove blockages.
4.5.4.2 Protection against inadvertent re-engagement in case of mechanical elements stopped
by blockage
Automatic restarting of hazardous movement following clearance of a blockage by an operator in the
hazard zone shall be prevented. A restart shall require the intentional actuation of a control outside
the hazard zone (for example, torque limiter reset which requires a complete stop of the PTO to be re-
engaged).
4.6 Mixing/chopping device
4.6.1 Guarding for a machine equipped with cutting, loading, or cutting/loading tools
If the machine is equipped with cutting, loading, or cutting/loading tools, safety distances for
protection against contact with hazardous moving parts of the mixing/chopping device shall comply
with the safety distances of ISO 13857:2019, Tables 1, 3, 4 and 6 when the cutting, loading, or cutting/
loading tools are in the position for mixing and/or chopping, the loading door is closed, or both.
4.6.2 Guarding for a machine equipped with gravity discharge
A machine equipped with a gravity discharge shall meet at least one of the following when the machine
is empty:
— guarding to the extent practicable that prevents unintentional contact with the hazardous moving
parts of the mixing/chopping device and that does not contact the mixing/chopping device when a
horizontal force of 500 N is applied;
— the safety distances of ISO 13857:2019, Tables 1, 3, 4 and 6 to prevent unintended contact with
hazardous moving parts of the mixing/chopping device;
ISO/DIS 4254-19.2:2023(E)
— a distance ≥ 550 mm between the outermost edges of the discharge opening and the outer path
of the mixing/chopping device to ≥ 100 mm below a horizontal plane of the bottom edge of the
discharge opening (see Figure 5). If the distance h (see Figures 6 and 7) between the ground and the
lower edge of the guard is ≤ 800 mm,
— dimension a shall be ≥ 550 mm; and
— dimension b shall be ≥ 100 mm
If the distance h (see Figures 6 and 7) between the ground and the lower edge of the guard is >
800 mm,
— dimension a shall be ≥ 850 mm; and
— dimension b shall be ≥ 100 mm.
Dimensions in millimetres
Key
a distance between the guard and the distributor cylinder
b vertical distance between the edge of the guard and the distributor cylinder
h distance between the ground and the lower edge of the guard
Figure 5 — Guarding to prevent unintended contact with mixing/chopping device (machine
with gravity discharge)
ISO/DIS 4254-19.2:2023(E)
Key
1 distributor cylinder
2 guard
a distance between the guard and the distributor cylinder
b vertical distance between the edge of the guard and the distributor cylinder
h distance between the ground and the lower edge of the guard
Figure 6 — Protection against pinching hazard with a distributor cylinder – Horizontal
Key
1 distributor cylinder
2 guard
a distance between the guard and the distributor cylinder
b vertical distance between the edge of the guard and the distributor cylinder
h distance between the ground and the lower edge of the guard
Figure 7 — Protection against pinching hazard with a distributor cylinder – Vertical
ISO/DIS 4254-19.2:2023(E)
4.6.3 Guarding for a machine equipped with distribution device
A machine equipped with a distribution device shall meet at least one of the following in any distribution
condition:
— guarding to the extent practicable that prevents unintentional contact with the hazardous moving
parts of the mixing/chopping device and that does not contact the mixing/chopping device when a
horizontal force of 500 N is applied;
— the safety distances of ISO 13857:2019, Tables 1, 3, 4 and 6 to prevent unintended contact with
hazardous moving parts of the mixing/chopping device;
— a distance ≥ 550 mm between the outermost edge of the distribution device and the outer path of
the mixing/chopping device and a distance ≥ 550 mm between any point on the side guards of the
distribution device and the outer path of the mixing/chopping device. (see Figure 8)
NOTE See 4.9 for guarding of the distribution device.
Dimensions in millimetres
Figure 8 — Guarding to prevent unintended contact with mixing/chopping device (machine
with distribution device)
4.7 Mixing/chopping chamber
4.7.1 Viewing inside chamber
Where the upper edge of the mixing/chopping chamber at its lowest point is at more than 1,60 m above
the ground, at least one of the following means for viewing inside the chamber shall be provided:
a) an opening or observation means (for example, window, grid) to provide the operator direct
visibility while maintaining the safety distances of ISO 13857:2019, Tables 1, 3, 4 and 6 to prevent
contact with moving mechanical parts inside the mixing/chopping chamber;
ISO/DIS 4254-19.2:2023(E)
b) a platform of the machine, complying with ISO 4254-1:2013, 4.7.2. The distance between the
platform floor and the upper edge of the mixing/chopping chamber or platform railing shall
measure > 1,10 m and ≤ 1,60 m. Steps or ladders for platforms shall comply with ISO 4254-1:2013,
4.7.1.2;
c) a boarding means (for example, ladder fixed on the machine) which shall comply with
ISO 4254-1:2013, 4.7.1.2. The distance between the upper step and the upper edge of the mixing/
chopping chamber shall measure > 1,10 m and ≤ 1,60 m.
d) an observation means to allow indirect visibility from the operator's station (for example, mirrors,
closed-circuit television (CCTV)).
4.7.2 Reducing material build-up
The top edges of the mixing/chopping chamber shall be designed to minimize the accumulation of
material and to reduce the need for access to the top edges of the chamber. Examples for such designs
are:
— sloped edges;
— rounded profiles;
— limited horizontal surfaces.
4.7.3 Manual addi
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