ISO 6055:2023

INTERNATIONAL ISO
STANDARD 6055
Fourth edition
Industrial trucks — Overhead guards
— Specification and testing
Chariots de manutention — Protège-conducteurs — Spécifications et
essais
PROOF/ÉPREUVE
Reference number
ISO 6055:2023(E)
© ISO 2023

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ISO 6055:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
PROOF/ÉPREUVE © ISO 2023 – All rights reserved

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ISO 6055:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements for overhead guards on ride-on trucks . 2
4.1 General . 2
4.2 Protected area . 2
4.3 Dimensions . 3
4.4 Testing . 4
4.4.1 General . 4
4.4.2 Dynamic test . 4
4.4.3 Impact drop test . 6
4.4.4 Transparent material . 8
4.4.5 Operators' leg/foot protection test . 8
4.5 Performance requirements . 8
5 Requirements for industrial variable-reach trucks with operator position not
protected by the boom .11
5.1 General . 11
5.2 Protective structures . 11
5.3 Dimensions .12
5.4 Testing .12
5.4.1 General .12
5.4.2 Falling objects test .12
5.4.3 Overturning test .12
6 Information for maintenance .12
Bibliography .13
iii
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ISO 6055:2023(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 110, Industrial trucks, Subcommittee SC
2, Safety of powered industrial trucks.
This fourth edition cancels and replaces the third edition (ISO 6055:2004), which has been technically
revised.
The main changes are as follows:
— for stand-on controlled trucks, vertical clearance has been increased, from the platform to the
underside of the overhead guard;
— requirements for rough terrain variable-reach trucks have been excluded;
— specifications and test requirements have been added for transparent material used to bridge
openings in the top of the overhead guard structure not conforming to 4.3.1;
— information for use in relation to the inspection of structure and inspection and care of transparent
material has been added.
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.
iv
PROOF/ÉPREUVE © ISO 2023 – All rights reserved

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INTERNATIONAL STANDARD ISO 6055:2023(E)
Industrial trucks — Overhead guards — Specification and
testing
1 Scope
This document specifies the requirements and testing of overhead guards, operator’s leg(s)/feet
protection for industrial trucks and overturning testing of industrial variable-reach trucks with
operator position not protected by the boom (hereafter referred to as "trucks") requiring an overhead
guard according to ISO 3691-1 and ISO 3691-2.
This document is not applicable to rough-terrain variable-reach trucks and slewing rough-terrain
variable-reach trucks.
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 3164, Earth-moving machinery — Laboratory evaluations of protective structures — Specifications for
deflection-limiting volume
ISO 3449, Earth-moving machinery — Falling-object protective structures — Laboratory tests and
performance requirements
ISO 3471, Earth-moving machinery — Roll-over protective structures — Laboratory tests and performance
requirements
ISO 3691-1:2011, Industrial trucks — Safety requirements and verification — Part 1: Self-propelled
industrial trucks, other than driverless trucks, variable-reach trucks and burden-carrier trucks
ISO 3691-1:2011/AMD1: 2020, Industrial trucks — Safety requirements and verification — Part 1: Self-
propelled industrial trucks, other than driverless trucks, variable-reach trucks and burden-carrier trucks
— Amendment 1
ISO 3691-2:2016, Industrial trucks — Safety requirements and verification — Part 2: Self-propelled
variable-reach trucks
ISO 5053-1, Industrial trucks — Vocabulary — Part 1: Types of industrial trucks
ISO 5353, Earth-moving machinery, and tractors and machinery for agriculture and forestry — Seat index
point
ISO 13564-1:2012, Powered industrial trucks — Test methods for verification of visibility — Part 1: Sit-on
and stand-on operator trucks and variable-reach trucks up to and including 10 t capacity
ISO 16936-1:2020, Glass in building — Forced-entry security glazing — Part 1: Test and classification by
repetitive ball drop
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5053-1, ISO 3691-1, ISO 3691-2
and ISO 5353 and the following apply.
1
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ISO 6055:2023(E)
ISO and IEC maintain terminology 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
overhead guard
device fitted to the truck for the purpose of protecting the operator against falling objects
[SOURCE: ISO 3691-2:2016, 3.12]
4 Requirements for overhead guards on ride-on trucks
4.1 General
This clause applies to trucks fitted with masts and industrial variable-reach trucks where the operator
position is protected by the boom, i.e. the mast or boom prevents the truck from tipping more than a
nominal 90°.
4.2 Protected area
4.2.1 The overhead guard shall extend over the operator when in the normal operating position(s) as
defined in ISO 3691-1 and ISO 3691-2 and when the operator is operating the controls as provided by
the truck manufacturer. For overhead guards fixed to the mast, this also applies when the mast is tilted.
The overhead guard shall not extend beyond the plan view outline of the truck.
The control levers in their neutral position, the pedals in their released condition and the steering wheel
are considered protected if they do not project in the direction of the mast more than 150 mm beyond
the vertical projection of the outline of the overhead guard onto a horizontal plane; see Figure 1.
Adjustable steering wheel position for the driving mode shall be placed in the centre position. No
account is taken of the parking brake lever in its foremost position in relation to the mast.
2
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ISO 6055:2023(E)
Dimensions in millimetres
Key
1 edge of overhead guard
2 phantom view of front support
3 rear of forward structure
4 foot protection structure
Figure 1 — Satisfactory protection by the overhead guard
Any part of the operator’s leg or feet, in the normal operating position, that projects more than 150 mm
beyond the front of the overhead guard when vertically projected onto a horizontal plane shall be
protected by a structure. The test procedure for the structure is described in 4.4.5.
4.2.2 Failure of the tilting mechanism shall not directly, or indirectly, cause the operator to be in
danger because of the overhead guard.
4.3 Dimensions
4.3.1 Openings in the top of the overhead guard shall not permit a sphere larger than 150 mm
diameter to pass through the openings.
4.3.2 If transparent material (for example glass) is used to bridge openings in the top of the overhead
guard structure that do not conform to 4.3.1 the transparent material shall conform to 4.4.4.
3
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ISO 6055:2023(E)
4.3.3 For trucks on which the operator is seated, the vertical clearance from the seat index point (SIP)
in accordance with ISO 5353 to the underside of the section of the overhead guard under which the
operator’s head is located when the operator is in the normal operating position, shall not be less than
903 mm.
NOTE 1 The distance of 903 mm (SIP) provides 24 mm clearance for the 95th percentile operator (1 905 mm)
according to ISO 3411.
4.3.4 For trucks on which the operator stands, the vertical clearance, from the platform where the
operator stands to the underside of the section of the overhead guard under which the operator's head
is located when the operator is in the normal operating position, shall not be less than 1 905 mm.
4.3.5 For applications requiring a reduced height overhead guard, with a clearance below what is
specified in
...

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ISO 6055:20222023(E)
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 2023-02
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ISO TC 110/SC 2
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Secretariat: SIS
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Industrial trucks — Overhead guards — Specification and testing
+ 3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7
cm
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cm, Gutter: 1 cm, Width: 21 cm, Height: 29.7 cm,
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ISO 6055:20222023(E)
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© ISO 2023
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All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this
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publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical,
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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.
Formatted: Justified, Space After: 36 pt
ISO Copyright Office
CP 401 • CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland.
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at 17.2 cm
ii © ISO 2022 – All rights reserved
ii © ISO 2023 – All rights reserved

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ISO 6055:20222023(E)
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Contents Formatted: Font: 11.5 pt, Font color: Custom
Color(RGB(33;29;30))
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Foreword . iii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements for overhead guards on ride-on trucks . 2
4.1 General . 2
4.2 Protected area . 2
4.3 Dimensions . 4
4.4 Testing . 4
4.4.1 General . 4
4.4.2 Dynamic test . 4
4.4.3 Impact drop test . 6
4.4.4 Transparent material . 9
4.4.5 Operators' leg/foot protection test . 9
4.5 Performance requirements . 9
5 Requirements for industrial variable-reach trucks with operator position not
protected by the boom . 13
5.1 General . 13
5.2 Protective structures . 13
5.3 Dimensions . 14
5.4 Testing . 14
5.4.1 General . 14
5.4.2 Falling objects test . 14
5.4.3 Overturning test . 14
6 Information for maintenance . 14
Foreword . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Requirements for overhead guards on ride-on trucks . 2
4.1 General . 2
4.2 Protected area . 2
4.3 Dimensions . 4
4.4 Testing . 5
4.4.1 General . 5
4.4.2 Dynamic test . 5
4.4.3 Impact drop test . 8
4.4.4 Transparent material . 11
4.4.5 Operators' leg/foot protection test . 12
4.5 Performance requirements . 12
5 Requirements for industrial variable-reach trucks with operator position not
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protected by the boom . 18
5.1 General . 18 Formatted: Normal, Space Before: 0 pt, Line spacing:
Exactly 12 pt, Tab stops: Not at 17.2 cm
© ISO 2022 – All rights reserved iii
© ISO 2023 – All rights reserved iii
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ISO 6055:20222023(E)
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Color(RGB(33;29;30))
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5.2 Protective structures . 18
5.3 Dimensions . 18
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5.4 Testing . 18
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5.4.1 General . 18
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5.4.2 Falling objects test . 18
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5.4.3 Overturning test . 18
6 Information for maintenance . 19
Bibliography . 20
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at 17.2 cm
iv © ISO 2022 – All rights reserved
iv © ISO 2023 – All rights reserved

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ISO 6055:20222023(E)
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Foreword
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ISO (the International Organization for Standardization) is a worldwide federation of national standards
Formatted: Space After: 36 pt
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).
Formatted: Hyperlink, English (United States)
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).
Formatted: Hyperlink, English (United States)
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.
Formatted: Hyperlink, English (United States)
This document was prepared by Technical Committee ISO/TC 110, Industrial trucks, Subcommittee SC 2,
Formatted: English (United Kingdom)
Safety of powered industrial trucks.
Formatted: English (United Kingdom)
This fourth edition cancels and replaces the third edition (ISO 6055:2004), which has been technically
Formatted: Adjust space between Latin and Asian text,
revised.
Adjust space between Asian text and numbers
Formatted: std_publisher, English (United Kingdom)
The main changes are as follows:
Formatted: English (United Kingdom)
— for stand-on controlled trucks increased, vertical clearance has been increased, from the platform to
Formatted: std_docNumber, English (United Kingdom)
the underside of the overhead guard;
Formatted: English (United Kingdom)
Formatted: std_year, English (United Kingdom)
— requirements for rough terrain variable-reach trucks have been excluded;
Formatted: English (United States)
— specifications and test requirements have been added for transparent material used to bridge
Formatted: Keep with next, Adjust space between Latin
openings in the top of the overhead guard structure not conforming to 4.3.1;
and Asian text, Adjust space between Asian text and
numbers
— information for use in relation to the inspection of structure and inspection and care of transparent
material has been added. Formatted: Font: Calibri, English (United States)
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.
Formatted: Hyperlink, English (United States)
Formatted: Font: 11 pt
Formatted: Normal, Space Before: 0 pt, Line spacing:

Exactly 12 pt, Tab stops: Not at 17.2 cm
© ISO 2022 – All rights reserved v
© ISO 2023 – All rights reserved iii
Information classification: Internal

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INTERNATIONAL STANDARD ISO 6055:20222023(E)
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Color(RGB(33;29;30))

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Industrial trucks — Overhead guards — Specification and
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testing
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Color(RGB(33;29;30))
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1 Scope
Formatted: Section start: New page
This document specifies the requirements and testing of overhead guards, operator’s leg(s)/feet
protection for industrial trucks and overturning testing of industrial variable-reach trucks with operator
position not protected by the boom (hereafter referred to as "trucks") requiring an overhead guard
according to ISO 3691-1 and ISO 3691-2.
Formatted: std_publisher
This document is not applicable to rough-terrain variable-reach trucks and slewing rough-terrain Formatted: std_docNumber
variable-reach trucks.
Formatted: std_docPartNumber
Formatted: std_publisher
2 Normative references
Formatted: std_docNumber
Formatted: std_docPartNumber
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 3164, Earth-moving machinery — Laboratory evaluations of protective structures — Specifications for
Formatted: RefNorm, Tab stops: 0.7 cm, Left + 1.4 cm,
deflection-limiting volume
Left + 2.1 cm, Left + 2.8 cm, Left + 3.5 cm, Left + 4.2
cm, Left + 4.9 cm, Left + 5.6 cm, Left + 6.3 cm, Left +
ISO 3449, Earth-moving machinery — Falling-object protective structures — Laboratory tests and 7 cm, Left
performance requirements
ISO 3471, Earth-moving machinery — Roll-over protective structures — Laboratory tests and performance
requirements
ISO 3691-1:2011, Industrial trucks — Safety requirements and verification — Part 1: Self-propelled
industrial trucks, other than driverless trucks, variable-reach trucks and burden-carrier trucks
ISO 3691-1:2011/AMD1:2020, Industrial trucks — Safety requirements and verification — Part 1: Self-
propelled industrial trucks, other than driverless trucks, variable-reach trucks and burden-carrier trucks —
Amendment 1
ISO 3691-2:2016, Industrial trucks — Safety requirements and verification — Part 2: Self-propelled
variable-reach trucks
ISO 5053-1, Industrial trucks — Vocabulary — Part 1: Types of industrial trucks
ISO 5353, Earth-moving machinery, and tractors and machinery for agriculture and forestry — Seat index
point
ISO 13564-1:2012, Powered industrial trucks — Test methods for verification of visibility — Part 1: Sit-on
and stand-on operator trucks and variable-reach trucks up to and including 10 t capacity
Formatted: Normal
ISO 16936-1:2020, Glass in building — Forced-entry security glazing — Part 1: Test and classification by
Formatted: Font: 9 pt
repetitive ball drop
Formatted: Font: 9 pt
Formatted: Font: Not Bold
Information classification: Internal
© ISO 20222023 – All rights reserved 11

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ISO 6055:2023(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5053-1, ISO 3691-1, ISO 3691-2
Formatted: std_publisher
and ISO 5353 and the following apply.
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
Formatted: std_docNumber
— ISO Online browsing platform: available at https://www.iso.org/obp
Formatted: std_docPartNumber
— IEC Electropedia: available at https://www.electropedia.org/
Formatted: std_publisher
3.1 Formatted: std_docNumber
overhead guard
Formatted: std_docPartNumber
device fitted to the truck for the purpose of protecting the operator against falling objects
Formatted: std_publisher
[SOURCE: ISO 3691-2:2016, 3.12]
Formatted: std_docNumber
Formatted: std_docPartNumber
Formatted: std_publisher
4 Requirements for overhead guards on ride-on trucks
Formatted: std_docNumber
4.1 General
Formatted: English (United States)
Formatted: Font: Times New Roman, 12 pt, English
This clause applies to trucks fitted with masts and industrial variable-reach trucks where the operator
(United States)
position is protected by the boom, i.e. the mast or boom prevents the truck from tipping more than a
nominal 90°.
Formatted: English (United States)
Formatted: Adjust space between Latin and Asian text,
4.2 Protected area
Adjust space between Asian text and numbers, Tab
stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
4.2.1 The overhead guard shall extend over the operator when in the normal operating position(s) as
3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
defined in ISO 3691-1 and ISO 3691-2 and when the operator is operating the controls as provided by the
Formatted: English (United States)
truck manufacturer. For overhead guards fixed to the mast, this also applies when the mast is tilted. The
overhead guard shall not extend beyond the plan view outline of the truck.
Formatted: Font: Times New Roman, English (United
States)
The control levers in their neutral position, the pedals in their released condition and the steering wheel
Formatted: std_publisher
are considered protected if they do not project in the direction of the mast more than 150 mm beyond
the vertical projection of the outline of the overhead guard onto a horizontal plane; see Figure 1. Formatted: std_docNumber
Formatted: std_docPartNumber
Adjustable steering wheel position for the driving mode shall be placed in the centre position. No account
is taken of the parking brake lever in its foremost position in relation to the mast.
Formatted: std_year

Formatted: std_section
Formatted: Default Paragraph Font
Formatted: std_publisher
Formatted: std_docNumber
Formatted: std_docPartNumber
Formatted: std_publisher
Formatted: std_docNumber
Formatted: std_docPartNumber
Formatted: Normal
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Formatted: Font: 9 pt
Information classification: Internal
22 © ISO 20222023 – All rights reserved

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ISO 6055:2023(E)
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Dimensions in mmmillimetres

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Information classification: Internal
© ISO 20222023 – All rights reserved 33

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ISO 6055:2023(E)

Key
1 edge of overhead guard
Formatted Table
2 phantom view of front support
3 rear of forward structure
4 foot protection structure
4 foot protection structure
Figure 1 — Satisfactory protection by the overhead guard
Any part of the operator’s leg or feet, in the normal operating position, that projects more than 150 mm
beyond the front of the overhead guard when vertically projected onto a horizontal plane shall be
protected by a structure. The test procedure for the structure is described in 4.4.5.
4.2.2 Failure of the tilting mechanism mustshall not directly, or indirectly, cause the operator to be in
danger because of the overhead guard.
4.3 Dimensions
4.3.1 Openings in the top of the overhead guard shall not permit a sphere larger than 150 mm diameter
to pass through the openings.
Formatted: Normal
4.3.2 If transparent material (for example glass) is used to bridge openings in the top of the overhead
Formatted: Font: Not Bold
guard structure that do not conform to 4.3.1 the transparent material shall conform to 4.4.4.
Formatted: Font: 9 pt
Formatted: Font: 9 pt
Information classification: Internal
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ISO 6055:2023(E)
Formatted: Right
4.3.3 For trucks on which the operator is seated, the vertical clearance from the seat index point (SIP)
Formatted: std_publisher
in accordance with ISO 5353 to the underside of the section of the overhead guard under which the
operator’s head is located when the operator is in the normal operating position, shall not be less than
Formatted: std_docNumber
903 mm.
NOTE 1 The distance of 903 mm (SIP) provides 24 mm clearance for the 95th percentile operator (1 905 mm)
according to ISO 3411:2007.
Formatted: std_publisher
Formatted: std_docNumber
4.3.4 For trucks on which the operator stands, the vertical clearance, from the platform where the
operator stands to the underside of the section of the overhead guard under which the operator's head is
located when the operator is in the normal operating position, shall not be less than 1 905 mm.
4.3.5 For applications requiring a reduced height overhead guard, with a clearance below what is
specified in 4.3.3 and 4.3.4, the manufacturer may reduce the vertical clearance for the operator's head
under the overhead guard.
Where there is reduced vertical clearance, information shall be provided with the overhead guard
specifying any limits (for example height of operator) associated with trucks on which the overhead
guard is fitted.
NOTE 1 Guidance on operator height is provided in ISO 3411:2007, Table 1 and Table 2.
Formatted: std_publisher
Formatted: std_docNumber
The requirements of 4.5.2 shall not be modified for overhead guards with reduced clearance.
Formatted: std_year
4.3.6 Where the manufacturer of the overhead guard has received a request from the user to reduce
Formatted: std_section
the risk of falling objects which could pass through the 150 mm opening (see 4.3.1), then the overhead
guard shall be constructed with the opening set as necessary based on the information provided by the
user.
4.4 Testing
4.4.1 General
4.4.1.1 A dynamic and an impact drop test shall be carried out on an overhead guard fitted to a truck of
the type and rated capacity for which it has been designed. Alternatively, the overhead guard may be
mounted on a test chassis provided that the mounting characteristics (for example rigidity, dimensional),
are the same as on the truck for which it was designed.
4.4.1.2 The same overhead guard and mounting shall be used for both tests. The dynamic test, as
described in 4.4.2, shall be conducted first, followed by the impact drop test, as described in 4.4.3.
4.4.1.3 In the case of specially designed overhead guards fitted to trucks, other means, such as
calculation methods that have been verified through tests on comparable overhead guards, may be used
to determine conformance to the requirements.
4.4.2 Dynamic test
4.4.2.1 The purpose of this test is to determine the resistance to permanent deflection of the overhead
guard.
4.4.2.2 The test object shall be a mass of 45 kg having a square striking face with a side dimension of
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3
300 mm. The striking face shall be timber with a minimum density of 600 kg/m and at least 50 mm thick.
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+5 +5
The corners and edges shall have a radius of 10 10 mm.
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0
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ISO 6055:2023(E)
4.4.2.3 The test object shall be positioned to drop in free fall with the striking face approximately parallel
to the top of the overhead guard, so as not to strike with a corner or an edge. The test object shall be
dropped a distance of 1,5 m 10 times.
The first drop shall be from a point with the centre of the test object vertically above the SIP of the
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operator's seat in accordance with ISO 5353, with the seat in its mid-point of adjustment (see Figure 2),
cm + 2.1 cm + 2.8 cm + 3.5 cm + 4.2 cm + 4.9 cm +
or for standing operator, vertically above the standing index point (STIP) as determined in 5.6 cm + 6.3 cm + 7 cm
ISO 13564-1:2012, Figure 4 ([see Figure 3a3 a) or 3b).3 b)]. The other 9 drops shall be in a clockwise
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direction with the centre of the test object equally aligned with points equally spaced on a 600 mm
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diameter circle, the centre point of which is vertically above the SIP of the operator's seat, in its midpoint
of adjustment, or above the centre of the standing operator, vertically above the standing index point Formatted: std_publisher
(STIP).
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To consistently orient the 9 drop points, one point shall be in the forward driving direction as described
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in ISO 3691-1 or established by the manufacturer if the forward driving direction is not defined in
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ISO 3691-1.
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It is recognized that in some positions the centre of the test object maycan be outside of the edge of the
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overhead guard when striking. It is permissible to reposition the test object along the same radius line
until the centre of the test object can strike the outer edge of the overhead guard [(see Figure 3 a) or
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3 b)].
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ISO 6055:2023(E)
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Key
a
1 arrow designates forward drivingForward travel direction.
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Figure 2 — Test object drop location points for sit-on truck above the SIP

Figure 3a Showing

a) Example 1 showing forward travel direction

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