EN ISO 8437-3:2021

Snow throwers - Safety requirements and test procedures - Part 3: Ride-on snow throwers (ISO 8437-3:2019)

This document specifies safety requirements applicable to combustion engine powered ride-on snow throwers. It is intended to be used with ISO 8437-1 and ISO 8437-4 to achieve the full requirements and means for ride-on snow throwers.
The ISO 8437 series deals with significant hazards, hazardous situations and events relevant to snow throwers used as intended and under the conditions reasonably foreseeable by the manufacturer.
It does not apply to the following:
—         electrically powered and battery powered snow throwers;
—         hand-held snow throwers;
—         airport or highway snow removal machines and equipment;
—         machines intended for use in potentially explosive atmospheres.
It does not deal with hazards related to the following:
—         battery circuits exceeding 42 V;
—         mains connected starting motor;
—         magneto grounding circuits;
—         working environment;
—         electromagnetic compatibility.
The ISO 8437 series is not applicable to machines that were manufactured before the date of its publication.

Schneefräsen - Sicherheitsanforderungen und Prüfverfahren - Teil 3: Schneefräsen mit Fahrersitz (ISO 8437-3:2019)

Dieses Dokument legt sicherheitstechnische Anforderungen fest, die auf verbrennungsmotorisch angetriebene Schneefräsen mit Fahrersitz anwendbar sind. Es ist zur Anwendung zusammen mit ISO 8437 1 und ISO 8437 4 vorgesehen, um die vollständigen Anforderungen und Prüfmittel für Schneefräsen mit Fahrersitz zu erreichen.
Die Normenreihe ISO 8437 behandelt die für Schneefräsen zutreffenden signifikanten Gefährdungen, Gefährdungssituationen und -ereignisse von Schneefräsen, die bestimmungsgemäß und unter den vom Hersteller vernünftigerweise vorhersehbaren Bedingungen der Fehlanwendung verwendet werden.
Es gilt nicht für Folgendes:
—   elektrisch angetriebene und batteriebetriebene Schneefräsen;
—   handgehaltene Schneefräsen;
—   Schneeräummaschinen und Geräte für Flughäfen oder Autobahnen;
—   Maschinen zur Verwendung in explosionsgefährdeten Bereichen.
Es behandelt keine Gefährdungen in Bezug auf:
—   Batteriestromkreise, die 42 V überschreiten;
—   Anlasser, die mit dem Stromnetz verbunden sind;
—   Erdungsschaltkreise des Magnetzünders;
—   Arbeitsumgebungen;
—   elektromagnetische Verträglichkeit.
Die Normenreihe ISO 8437 ist nicht für Maschinen anwendbar, die vor dem Datum ihrer Veröffentlichung hergestellt wurden.

Chasse-neige - Exigences de sécurité et essais - Partie 3: Chasse-neige à conducteur porté (ISO 8437-3:2019)

Le présent document spécifie les exigences de sécurité qui s'appliquent aux chasse-neige à moteur à combustion à conducteur porté. Il est destiné à être utilisé avec l'ISO 8437-1 et l'ISO 8437-4 afin de se conformer pleinement aux exigences et mettre en œuvre tous les moyens de vérification pour les chasse-neige à conducteur porté.
La série ISO 8437 traite des phénomènes dangereux, des situations dangereuses et des événements dangereux significatifs applicables aux chasse-neige lorsqu'ils sont utilisés comme prévu et dans des conditions raisonnablement prévisibles par le fabricant.
Elle ne s'applique pas:
—         aux chasse-neige électriques et à batterie;
—         aux chasse-neige portatifs;
—         aux machines et au matériel de déneigement pour aéroports ou autoroutes;
—         aux machines destinées à être utilisées dans des atmosphères explosibles.
Elle ne traite pas des phénomènes dangereux associés:
—         aux circuits de batterie dépassant 42 V;
—         aux démarreurs raccordés à l'alimentation secteur;
—         aux circuits de mise à la masse de la magnéto;
—         à l'environnement de travail;
—         à la compatibilité électromagnétique.
La série ISO 8437 ne s'applique pas aux machines fabriquées avant sa date de publication.

Snežne freze - Varnostne zahteve in preskusni postopki - 3. del: Snežne freze, na katerih se sedi (ISO 8437-3:2019)

General Information

• Status: Published
• Publication Date: 20-Apr-2021
• Withdrawal Date: 30-Oct-2021
• ICS: 43.160 - Special purpose vehicles
• Technical Committee: CEN/TC 144 - Tractors and machinery for agriculture and forestry
• Drafting Committee: CEN/TC 144/WG 7 - Garden equipment
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 21-Apr-2021
• Completion Date: 21-Apr-2021
• Directive: 2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
• Mandate: M/396 - Mandate to CEN and Cenelec for standardisation in the field of machinery
• Ref Project: SIST EN ISO 8437-3:2021 - Snow throwers - Safety requirements and test procedures - Part 3: Ride-on snow throwers (ISO 8437-3:2019)

Relations

• Amended By: EN ISO 8437-3:2021/prA1 - Snow throwers - Safety requirements and test procedures - Part 3: Ride-on snow throwers - Amendment 1 (ISO 8437-3:2019/DAM 1:2022)
• Effective Date: 20-Oct-2021

Overview

EN ISO 8437-3:2021 - Snow throwers - Safety requirements and test procedures - Part 3: Ride-on snow throwers (ISO 8437-3:2019), published by CEN, specifies safety requirements and test procedures for combustion engine powered ride-on snow throwers. It is a Type‑C machinery safety standard intended to be used together with ISO 8437-1 and ISO 8437-4 to achieve the full set of requirements and means for ride‑on machines. The document was adopted by CEN in 2021 and endorses the ISO 2019 edition without modification.

Key Topics and Requirements

This standard addresses significant hazards, hazardous situations and events reasonably foreseeable by manufacturers for ride‑on snow throwers. Major technical topics include:

• Controls

  • Engine starting and stopping
  • Collector and impeller controls
  • Directional and steering controls
  • Traction clutch, speed control and clutch requirements
  • Operator‑presence controls (OPC)

• Protection and guarding

  • Guards, shields, chutes, deflectors and housings
  • Hot surfaces and engine exhaust protection

• Fuel systems

  • Fuel tank overfill test
  • Fuel line axial pull test

• Electrical and electronic

  • Requirements for battery powered circuits (insulation, installation, overload protection, terminals) - note: the standard excludes electrically/battery powered machines
  • Electromagnetic immunity testing

• Performance and safety tests

  • Power drive and probe tests
  • Noise and vibration assessments
  • Braking and stability tests specific to ride‑on machines (service brake, parking brake, stability test procedures and acceptance criteria)

• Documentation and markings

  • Instruction handbook, markings and warning labels required for safe use

The standard explicitly does not cover electrically/battery‑powered or hand‑held snow throwers, airport/highway removal equipment, machines for explosive atmospheres, and certain hazards (e.g., battery circuits >42 V, mains starting motors, magneto grounding circuits, working environment, electromagnetic compatibility).

Applications and Who Uses It

EN ISO 8437-3:2021 is essential for:

• Snow thrower manufacturers and designers (product design, risk assessment and conformity)
• Test laboratories and certification bodies performing safety validation and type testing
• Product safety and regulatory compliance teams in Europe
• Procurement specialists specifying safety requirements for fleet purchase
• Service, maintenance and training personnel referencing safety tests and instructions

Using this standard helps demonstrate conformity to recognized safety practices and supports compliance in markets where CEN adoption applies.

Related Standards

• ISO 8437 series (use together with ISO 8437-1 and ISO 8437-4 for complete ride‑on requirements)
• ISO 12100 (general principles for risk assessment and machinery safety - Type‑C standard classification)

Keywords: EN ISO 8437-3:2021, ride-on snow throwers, safety requirements, test procedures, snow thrower safety, CEN, ISO 8437.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2021
Snežne freze - Varnostne zahteve in preskusni postopki - 3. del: Snežne freze, na
katerih se sedi (ISO 8437-3:2019)
Snow throwers - Safety requirements and test procedures - Part 3: Ride-on snow
throwers (ISO 8437-3:2019)
Schneefräsen - Sicherheitsanforderungen und Prüfverfahren - Teil 3: Schneefräsen mit
Fahrersitz (ISO 8437-3:2019)
Chasse-neige - Exigences de sécurité et essais - Partie 3: Chasse-neige à conducteur
porté (ISO 8437-3:2019)
Ta slovenski standard je istoveten z: EN ISO 8437-3:2021
ICS:
43.160 Vozila za posebne namene Special purpose vehicles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 8437-3
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2021
EUROPÄISCHE NORM
ICS 43.160
English Version
Snow throwers - Safety requirements and test procedures
- Part 3: Ride-on snow throwers (ISO 8437-3:2019)
Chasse-neige - Exigences de sécurité et essais - Partie Schneefräsen - Sicherheitsanforderungen und
3: Chasse-neige à conducteur porté (ISO 8437-3:2019) Prüfverfahren - Teil 3: Schneefräsen mit Fahrersitz
(ISO 8437-3:2019)
This European Standard was approved by CEN on 9 February 2019.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

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

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8437-3:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 8437-3:2021) has been prepared by Technical Committee ISO/TC 23 "Tractors
and machinery for agriculture and forestry" in collaboration with Technical Committee CEN/TC 144
“Tractors and machinery for agriculture and forestry” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by October 2021, and conflicting national standards shall
be withdrawn at the latest by October 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 8437-3:2019 has been approved by CEN as EN ISO 8437-3:2021 without any
modification.
INTERNATIONAL ISO
STANDARD 8437-3
First edition
2019-07
Snow throwers — Safety requirements
and test procedures —
Part 3:
Ride-on snow throwers
Chasse-neige — Exigences de sécurité et essais —
Partie 3: Chasse-neige à conducteur porté
Reference number
ISO 8437-3:2019(E)
©
ISO 2019
ISO 8437-3:2019(E)
© ISO 2019
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: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

ISO 8437-3:2019(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Snow thrower safety requirements and test procedures . 2
4.1 General . 2
4.2 Controls . 2
4.2.1 General. 2
4.2.2 Engine stopping and starting . 5
4.2.3 Collector and impeller control . 6
4.2.4 Directional control . 7
4.2.5 Clutch control requirements for traction clutch or neutral, or both . 7
4.2.6 Traction speed control . 8
4.2.7 Steering control . 9
4.2.8 Operator-presence control (OPC) .10
4.3 Guards, shields, chutes, deflectors and housings .10
4.3.1 General.10
4.3.2 Hot surfaces.13
4.3.3 Engine exhaust.13
4.4 Fuel .13
4.4.1 Fuel tank overfill test .13
4.4.2 Fuel line axial pull test .13
4.5 Electrical equipment: battery-powered circuits (not including magneto grounding
circuits) .14
4.5.1 Insulated cables .14
4.5.2 Battery installation .14
4.5.3 Overload protection .14
4.5.4 Terminals and non-insulated electrical parts .14
4.6 Power drive .14
4.7 Probe test .14
4.7.1 Test procedure .14
4.7.2 Test acceptance .15
4.8 Electromagnetic immunity .15
4.9 Noise .15
4.10 Vibration .15
5 Instructions for use .16
5.1 Instruction handbook .16
5.2 Markings .16
5.3 Warnings .16
6 Ride–on machines with snow thrower attachment: specific requirements .16
6.1 Service brake .16
6.1.1 Requirements .16
6.1.2 Test procedure .16
6.1.3 Service brake strength requirements .17
6.2 Parking brake .17
6.2.1 Requirements .17
6.2.2 Test procedure .18
6.3 Stability .18
6.3.1 Requirements .18
6.3.2 Test procedure .19
6.3.3 Test acceptance .19
ISO 8437-3:2019(E)
Annex A (normative) Instruction handbook .20
Bibliography .23
iv © ISO 2019 – All rights reserved

ISO 8437-3:2019(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 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 13, powered lawn and garden equipment.
This first edition of ISO 8437-3, together with ISO 8437-1, ISO 8437-2 and ISO 8437-4, cancels and
replaces ISO 8437:1989, which has been technically revised. It also incorporates the Amendment
ISO 8437:1989/Amd.1:1997.
A list of all parts in the ISO 8437 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.
ISO 8437-3:2019(E)
Introduction
The structure of safety standards in the field of machinery is as follows.
a) Type-A standards (basic standards) give basic concepts, principles for design and general aspects
that can be applied to machinery.
b) Type-B standards (generic safety standards) deal with one or more safety aspects or safeguards
that can be used across a wide range of machinery:
1) type-B1 standards on particular safety aspects (e.g. safety distances, surface temperature,
noise);
2) type-B2 standards on safeguards (e.g. two-handed controls, interlocking devices, pressure
sensitive devices, guards).
c) Type-C standards (machinery safety standards) deal with detailed safety requirements for a
particular machine or group of machines.
ISO 8437 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 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 provisions of this type-C standard are different from those which are stated in type-A or type-B
standards, the provisions of this type-C standard shall 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.
vi © ISO 2019 – All rights reserved

INTERNATIONAL STANDARD ISO 8437-3:2019(E)
Snow throwers — Safety requirements and test
procedures —
Part 3:
Ride-on snow throwers
1 Scope
This document specifies safety requirements applicable to combustion engine powered ride-on snow
throwers. It is intended to be used with ISO 8437-1 and ISO 8437-4 to achieve the full requirements and
means for ride-on snow throwers.
The ISO 8437 series deals with significant hazards, hazardous situations and events relevant to snow
throwers used as intended and under the conditions reasonably foreseeable by the manufacturer.
It does not apply to the following:
— electrically powered and battery powered snow throwers;
— hand-held snow throwers;
— airport or highway snow removal machines and equipment;
— machines intended for use in potentially explosive atmospheres.
It does not deal with hazards related to the following:
— battery circuits exceeding 42 V;
— mains connected starting motor;
— magneto grounding circuits;
— working environment;
— electromagnetic compatibility.
The ISO 8437 series is not applicable to machines that were 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 3411, Earth-moving machinery — Physical dimensions of operators and minimum operator space
envelope
ISO 5395-3, Garden equipment — Safety requirements for combustion-engine-powered lawnmowers —
Part 3: Ride-on lawnmowers with seated operator
ISO 8437-1:2019, Snow throwers — Safety requirements and test procedures — Part 1: Terminology and
common tests
ISO 8437-3:2019(E)
ISO 8437-4:2019, Snow throwers — Safety requirements and test procedures — Part 4: Information on
national and regional provisions
ISO 12100, Safety of machinery — General principles for design — Risk assessment and risk reduction
3 Terms and definitions
For the purposes of this document, the terms and definitions in ISO 8437-1 and ISO 12100 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 http: //www .electropedia .org/
4 Snow thrower safety requirements and test procedures
4.1 General
The machines shall comply with the safety requirements and/or protective measures of this clause.
In addition, the machine shall be designed in accordance with the principles of ISO 12100 for hazards
relevant but not significant that are not dealt with by this document (e.g. sharp edges on the outside of
the machine).
A slip-resistant surface or other means shall be provided to minimize the possibility of an operator’s
foot slipping off the foot supports or platforms.
Machines with a snow thrower shall be equipped with two red-colour reflex reflectors. They shall face
rearward and be mounted a minimum of 305 mm above the ground. A red tail light, visible at 91,4 m,
may be substituted for reflectors. Reflectors or tail lights shall be provided with the snow thrower
attachments if the propelling machine is not equipped with reflectors or tail lights.
For additional regional and national requirements, see ISO 8437-4:2019, Clause 6.
4.2 Controls
4.2.1 General
Operator controls shall be located within, and have a range of movement which remains within, the
operator control position given in Figure 1, except for
— engine controls,
— snow discharge chute and deflector control(s),
— manual lift,
— hydrostatic bypass valve, and
— parking brake.
Compliance shall be checked by inspection and measurement.
The controls shall be designed such that they can be operated by an operator with and without arctic
mittens see Figure 2.
Compliance shall be checked by functional test.
No controls shall be in any hazard zone (see Figure 1).
2 © ISO 2019 – All rights reserved

ISO 8437-3:2019(E)
Compliance shall be checked by inspection and functional test.
Pedals shall have a slip-resistant surface or other means of minimizing the possibility of the operator’s
foot slipping off the pedals.
Compliance shall be checked by inspection and functional test.
Controls where the purpose is not obvious to the user shall have the function, direction and/or method
of operation clearly identified by a durable label or mark except for the steering wheel, manual lift
controls, and snow discharge chute and deflector controls, which are optional.
Compliance shall be checked by inspection and labels shall be tested in accordance with
ISO 8437-1:2019, 5.3.
Detailed instructions on the operation of all controls shall be provided in an instruction handbook (see
Annex A).
Compliance shall be checked by inspection.
ISO 8437-3:2019(E)
Key
A operator position
B collector hazard zone
C discharge hazard zone
D discharge limit
Figure 1 — Operator position and hazard zones: ride-on snow throwers
4 © ISO 2019 – All rights reserved

ISO 8437-3:2019(E)
Key
A pressed flat
NOTE 1 All dimensions approximate, without hand in glove.
NOTE 2 Material: buckskin outer shell with knit liner.
Figure 2 — Arctic mitten
4.2.2 Engine stopping and starting
4.2.2.1 Starting device
A switch operated by a removable key, or a similar device, shall be provided to prevent unauthorized
starting of the engine unless a manual starter (such as an integral starter rope) is the only means of
starting the engine. Any engine starting device shall require intentional activation in order to start the
engine. Snow throwers shall not be provided with a starter operated by means of a loose rope.
Compliance shall be checked by inspection and functional test.
4.2.2.2 Stopping device
An engine stopping device shall be provided. The device shall not depend on sustained manual pressure
for its continued operation. An emergency stop device is not required.
Compliance shall be checked by inspection and functional test.
4.2.2.3 Hand-operated
The direction of motion for a handle-mounted engine speed hand-lever control shall be
a) generally forward or upward, or both, to increase speed, and
b) generally rearward or downward, or both, to decrease speed.
Compliance shall be checked by inspection and functional test.
ISO 8437-3:2019(E)
4.2.2.4 Foot-operated
When a foot-operated engine speed control pedal is provided, it shall be operated by the right foot with
the direction of motion generally forward or downward, or both, to increase speed. It shall be located
within the operator control position.
Compliance shall be checked by inspection and functional test.
4.2.2.5 Drive interlock for starting
A means shall be provided to prevent starting of the engine unless
a) the collector and impeller drive are disengaged, and
b) the traction drive is disengaged or in a neutral position.
Compliance shall be checked by inspection and functional test.
4.2.2.6 Engine speed
For regional and national requirements on engine speed, see ISO 8437-4:2019, Clause 6.
4.2.3 Collector and impeller control
4.2.3.1 Operator-presence control
A means shall be provided to automatically stop the impeller and/or collector or kill the engine
when the operator leaves the operator position. The collector and/or impeller may resume operation
upon reactivation of the operator-presence control, provided the collector and impeller did not stop.
Additional requirements are given at 4.2.8.
Compliance shall be checked by inspection and functional test.
4.2.3.2 Stopping time
The impeller and/or collector shall stop within 5 s, and comply with 4.2.3.4 when the control is
disengaged.
The engine shall be set at the equipment manufacturer’s maximum specified speed. The control shall be
fixed to maintain the maximum speed.
Compliance shall be checked by inspection, measurement, and test in accordance with 4.2.3.4.
4.2.3.3 Impeller or traction engagement control
A means shall be provided to permit the machine to be transported under its own power without
the impeller engaged. A means shall also be provided to permit engagement of the impeller without
engagement of the traction drive.
Compliance shall be checked by inspection and functional test.
4.2.3.4 Impeller controls tests
4.2.3.4.1 Test procedure
Stopping time shall be measured from the initiation of a stop command from the maximum speed
achievable by means of the operator’s engine speed control.
6 © ISO 2019 – All rights reserved

ISO 8437-3:2019(E)
When collector and impeller stopping is achieved by means of a power disconnecting device (e.g. clutch)
the engine shall be run for 15 min uninterrupted, with controls in the disengaged position. The engine
shall be operated at the maximum operating speed obtained by the operator control.
This test is not required if a means is provided that will automatically stop the engine when the operator
leaves the operator position.
4.2.3.4.2 Test acceptance
The criteria for failure shall be as follows.
— For all machines, the measured stopping time for the collector and/or impeller exceeds 5 s.
— For machines with a power disconnection device (e.g. clutch), the impeller and/or collector revolve
more than 3 revolutions during the 15 min test period with the control in the disengaged position.
Compliance shall be checked by inspection and functional test.
4.2.4 Directional control
Except for lever-steer snow throwers, forward/reverse directional controls shall require at least one of
the following.
— A distinct change in direction of the control actuation (for example, right angle to general path of
control motion) at a point before a change in direction occurs.
— A distinct change in force level at the point of entry into the selected direction.
— A positive means of retarding machine acceleration, for example hydrostatic control with valves
operated by rigid linkages.
Compliance shall be checked by inspection and functional test.
4.2.5 Clutch control requirements for traction clutch or neutral, or both
4.2.5.1 General
A ride-on lawnmower equipped with a clutch control system meeting the requirements of ISO 5395-3
for the clutch control shall be considered compliant with this subclause when using the same traction
control system with a snow thrower attachment.
For machines with a clutch control system that does not meet the requirements of ISO 5395-3, the
requirements in 4.2.5.2 to 4.2.5.6 shall apply.
4.2.5.2 Foot pedal control
When provided, a foot pedal control shall be actuated by the operator’s left foot, with the direction of
motion generally forward or downward, or both, for disengagement. Operator-presence controls shall
not be included in this requirement.
Compliance shall be checked by inspection.
4.2.5.3 Hand-operated control
When provided, a hand-operated clutch control shall be moved generally rearward or toward the
operator for disengagement. This requirement shall not be applied to an operator-presence control in
4.2.5.4.
Compliance shall be checked by inspection and functional test.
ISO 8437-3:2019(E)
4.2.5.4 Operator-presence control
In addition to the requirements of 4.2.8, a generally forward or downward motion on the foot-actuated
operator-presence control, when provided, shall produce clutch engagement. A right-foot operator-
presence control shall be outboard of the service brake pedal.
Compliance shall be checked by inspection.
4.2.5.5 Traction clut
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