SIST EN ISO 11681-2:1999

SLOVENSKI STANDARD
SIST EN ISO 11681-2:1999
01-marec-1999
Stroji za gozdarstvo - Prenosne motorne verižne žage - Varnostne zahteve in
preskušanje - 2. del: Žage za nego drevesa (ISO 11681-2:1998)
Machinery for forestry - Portable chain-saws - Safety requirements and testing - Part 2:
Chain-saws for tree service (ISO 11681-2:1998)
Forstmaschinen - Tragbare Motorsägen - Sicherheitstechnische - Anforderungen und
Prüfung - Teil 2: Motorsägen für die Baumpflege (ISO 11681-2:1998)
Matériel forestier - Scies a chaîne portatives - Exigences de sécurité et essais - Partie 2:
Scies a chaîne pour l'élagage des arbres (ISO 11681-2:1998)
Ta slovenski standard je istoveten z: EN ISO 11681-2:1998
ICS:
65.060.80 Gozdarska oprema Forestry equipment
SIST EN ISO 11681-2:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

INTERNATIONAL ISO
STANDARD 11681-2
First edition
1998-04-01
Machinery for forestry — Portable chain-
saws — Safety requirements and testing —
Part 2:
Chain-saws for tree service
Matériel forestier — Scies à chaîne portatives — Exigences de sécurité et
essais —
Partie 2: Scies à chaîne pour l'élagage des arbres
A
Reference number
ISO 11681-2:1998(E)

---------------------- Page: 2 ----------------------

ISO 11681-2:1998(E)
Content
1 Scope .1
2 Normative references .1
3 Definitions .2
4 Safety requirements .3
4.1 Handles.3
4.2 Hand protection .3
4.2.1 Protection at the front handle.3
4.2.2 Protection at the rear handle .4
4.3 Balance .4
4.4 Protection against injury by kickback .4
4.5 Chain catcher .5
4.6 Spiked bumper.5
4.7 Chip discharge.5
4.8 Guide-bar cover .5
4.9 Noise emission.5
4.10 Vibration .5
4.11 Throttle trigger .5
4.12 Engine-stopping device .6
4.13 Protection against contact with parts under high voltage .6
4.14 Clutch.6
4.15 Carburettor adjustment.6
4.16 Protection against contact with hot parts.6
4.17 Exhaust gases.6
©  ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet central@iso.ch
X.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
ii

---------------------- Page: 3 ----------------------

© ISO ISO 11681-2:1998(E)
4.18 Chain lubrication . 7
4.19 Tank openings . 7
4.20 Chain tensioning. 7
4.21 Attachment point . 7
5 Verification of safety requirements. 7
6 Information for use. 9
6.1 General . 9
6.2 Technical data. 9
6.3 Instruction handbook. 10
6.4 Marking . 12
Annex A (normative) List of hazards . 13
Annex B (normative) Minimum handle clearance and sizes. 16
Annex C (normative) Determination of holding moment . 19
iii

---------------------- Page: 4 ----------------------

ISO 11681-2:1998(E) © ISO
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.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 11681-2 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for
agriculture and forestry, Subcommittee SC 17, Manually portable forest machinery.
ISO 11681 consists of the following parts, under the general title Machinery for forestry — Portable chain-saws —
Safety requirements and testing:
— Part 1: Chain-saws for normal forestry work
— Part 2: Chain-saws for tree service.
Annexes A , B and C form an integral part of this part of ISO 11681.
iv

---------------------- Page: 5 ----------------------

© ISO ISO 11681-2:1998(E)
Introduction
This part of ISO 11681 has been prepared for a special type of chain-saws used by trained persons for tree service
work up in trees.
1)
This part of ISO 11681 differs from ISO 11681-1 as follows:
3
 clause 1: the tree service chain-saws are limited in size by a maximum engine displacement of 40 cm ;
 clause 3: definitions for tree service chain-saw, attachment point and vibration isolation system have been
added;
 subclause 4.1: the required handle dimensions have been altered;
 subclause 4.3: a requirement for maximum allowed holding moment has been added;
 subclause 4.4: requirements have been added that the non-manual chain brake system meet the requirement
in ISO 13772 and that the allowed kickback angle be reduced to 30°;
 subclause 4.6: a permanently fixed spiked bumper is excluded;
 subclauses 4.9 and 4.10: the achievable values for noise and vibration have been deleted and replaced by a
note concerning the need for a future development of "state of the art" values;
 subclause 4.12: the requirement has been modified to be valid for an engine-stopping device (instead of an
ignition switch);
 subclause 4.13: the requirement for protection from contact with parts under high voltage has been enlarged to
include a requirement for an ignition interruption or short-circuiting device on the low voltage side and a method
to verify, by inspection and use of a finger probe, the protection of the operator from unintentional contact with
parts under high voltage;
 subclause 4.16: the requirement for protection from hot parts has been enlarged to all parts of the machine and
a reference to EN 563 has been added;
 subclause 4.18: the requirement has been clarified to be valid when holding the saw in both handles (normal
operating position);
 subclause 4.21: a requirement for an attachment point has been added
 subclause 6.2: additional information is required;
 subclause 6.3: new safety warnings have been added;
 subclause 6.4: new markings on the saw are required.
Machinery is to comply as appropriate with ISO/TR 12100 for hazards which are not covered by this part of
ISO 11681.

1)
Equivalent to EN 608:1994.
v

---------------------- Page: 6 ----------------------

INTERNATIONAL STANDARD  © ISO ISO 11681-2:1998(E)
Machinery for forestry — Portable chain-saws — Safety
requirements and testing —
Part 2:
Chain-saws for tree service
1 Scope
This part of ISO 11681 specifies safety requirements and their verification for the design and construction of
portable combustion-engined, hand-held chain-saws for tree service, designed for use by one operator (see
figure 1).
3
It is applicable to chain-saws with a maximum engine displacement of 40 cm . These chain-saws are only intended
to be used for tree service operation by an operator working up in trees.
It describes methods for the elimination or reduction of hazards arising from their use. In addition it specifies the
type of information on safe working practices to be provided by the manufacturer. It does not, however, give any
technical requirement to reduce noise and vibration hazards. Indeed, the different means available to reduce these
hazards are a matter for the technical aids to which the manufacturer may resort, through specialized books or
specific bodies.
The list of significant hazards which require action to reduce the risk is given in annex A.
The environmental aspects are not covered.
This part of ISO 11681 is primarily applicable to machines which are manufactured after the date publication.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of
ISO 11681. At the time of publication, the editions indicated were valid. All standards are subject to revision, and
parties to agreements based on this part of ISO 11681 are encouraged to investigate the possibility of applying the
most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid
International Standards.
2)
ISO 7182:1984, Acoustics — Measurement at the operator's position of airborne noise emitted by chain-saws.
ISO 3767-5:1992, Tractors, machinery for agriculture and forestry, powered lawn and garden equipment —
Symbols for operator controls and other displays — Part 5: Symbols for manual portable forestry machinery.
ISO 3864:1984, Safety colours and safety signs.
3)
ISO 6531:— , Machinery for forestry — Portable hand-held chain-saws — Vocabulary.
ISO 6533:1993, Forestry machinery — Portable chain-saw front hand-guard — Dimensions.

2)
Equivalent to EN 27182:1991.
3)
To be published. (Revision of ISO 6531:1982)
1

---------------------- Page: 7 ----------------------

ISO 11681-2:1998(E) © ISO
ISO 6534:1992, Portable chain-saws — Hand-guards — Mechanical strength.
ISO 6535:1991, Portable chain-saws — Chain brake performance.
ISO 7293:1997, Forestry machinery — Portable chain-saws — Engine performance and fuel consumption.
ISO 7505:1986, Forestry machinery — Chain saws — Measurement of hand-transmitted vibration.
ISO 7915:1991, Forestry machinery — Portable chain-saws — Determination of handle strength.
ISO 8334:1985, .
Forestry machinery — Portable chain-saws — Determination of balance
ISO 9207:1995, Manually portable chain-saws with internal combustion engine — Determination of sound power
levels — Engineering method (grade 2).
4)
ISO 9518:— , Forestry machinery — Portable chain-saws — Kickback test.
ISO 10726:1992, Portable chain-saws — Chain catcher — Dimensions and mechanical strength.
ISO/TR 12100-1:1992, Safety of machinery — Basic concepts, general principles for design — Part 1: Basic
5)
terminology, methodology.
ISO/TR 12100-2:1992, Safety of machinery — Basic concepts, general principles for design — Part 2: Technical
6)
principles and specifications.
ISO 13772:1997, Forestry machinery — Portable chain-saws — Non-manually actuated chain brake performance.
IEC 60335-1:1991, Safety of household and similar electrical appliances — Part 1: General requirements.
EN 563:1994,
Safety of machinery — Temperatures of touchable surfaces — Ergonomics data to establish
.
temperature limit values for hot surfaces
3 Definitions
For the purposes of this part of ISO 11681, the definitions given in ISO 6531 and the following apply.
3.1 chain-saw for tree service
chain-saw with a limited engine displacement, specially designed for use by trained tree service workers only when
working up in trees
3.2 attachment point
suspension point located behind or within the rear handle, which allows for the attachment of a safety strap,
carabiner or rope, as appropriate
3.3 vibration isolation system
set of components (for example elastic buffers, springs) designed to reduce the transmission of vibrations
generated by the engine and the cutting attachments, to the hands of the operator
NOTE — Certain commonly used terms relating to chain-saws for tree service are given in figure 1.

4)
To be published. (Revision of ISO 9518:1992)
5)
Equivalent to EN 292-1:1991.
6)
Equivalent to EN 292-2:1991.
2

---------------------- Page: 8 ----------------------

© ISO ISO 11681-2:1998(E)
Key
1 Rear handle
2 Throttle trigger lockout
3 Throttle trigger
4 Front handle
5 Front handle guard
6 Guide-bar cover
7 Guide-bar
8 Spiked bumper
9 Chain catcher
10 Stopping device
11 Attachment point
Figure 1 — Chain-saw for tree service
4 Safety requirements
The safe running of chain-saws depends on both the safety requirements as described in this clause and the safe
environment associated with the use of personal protection equipment such as gloves, leg protection, boots, as well
7)
as eye and ear protection equipment. For protective clothing see EN 381 .
4.1 Handles
Chain-saws shall have a handle for each hand. These handles shall be designed so that they can be fully gripped
by an operator when wearing protective gloves, provide the necessary sureness of grip by their shaping and surface
and conform to the dimensions and clearances given in annex B.
The strength of both handles shall comply with ISO 7915.
The operator shall be able to stop the chain-saw with the stopping device (see 4.12) even in case of failure in the
vibration isolation system.
4.2 Hand protection
4.2.1 Protection at the front handle
A guard shall be fitted in the vicinity of the front handle (see figure 1), to protect the operator's fingers from injury by
contact with the saw chain.
The dimensions of this front hand-guard shall comply with ISO 6533. Its strength shall comply with ISO 6534.

7)
EN 381 (all parts), Protective clothing for users of hand-held chainsaws.
3

---------------------- Page: 9 ----------------------

ISO 11681-2:1998(E) © ISO
4.2.2 Protection at the rear handle
Hand protection shall be provided along the length of the right side of the bottom of the rear handle. This protection
shall extend from the right edge of the handle for at least 30 mm at the guide-bar side and at least 100 mm
lengthwise (see figure 2).
This protection can also be provided by parts of the saw.
The strength of the rear hand-guard shall comply with ISO 6534.
Dimensions in millimetres
Figure 2 — Minimum dimensions of protection at the rear handle
4.3 Balance
The chain-saw shall be balanced when fitted with the manufacturer's recommended guide-bars. The balance shall
be tested in accordance with ISO 8334. The maximum angle of the guide-bar shall not exceed 30° above and below
the horizontal plane.
The holding moment to hold the chain-saw in a sideways position shall be 7 Nm maximum when determined in
accordance with annex C.
4.4 Protection against injury by kickback
4.4.1  The chain-saw shall be fitted with a chain brake. It shall be possible to activate the chain brake manually by
means of the front hand-guard.
There shall also be a non-manual chain brake activation system which activates the chain brake when kickback
occurs. This system shall comply with ISO 13772.
The computed kickback angle and chain stop angle shall be determined with cutting attachments recommended by
the manufacturer and in accordance with ISO 9518.
The computed kickback angle or chain stop angle, whichever is less, shall not exceed 30°.
4.4.2  The chain brake release force shall be between 20 N and 60 N.
4

---------------------- Page: 10 ----------------------

© ISO ISO 11681-2:1998(E)
The average braking time shall not exceed 0,12 s and the maximum braking time shall not exceed 0,15 s.
Measurements of release force and braking times shall be carried out in accordance with ISO 6535.
4.5 Chain catcher
The chain-saw shall be fitted with a chain catcher that conforms to the dimensions and strength requirements of
ISO 10726.
4.6 Spiked bumper
The chain-saw shall have provision to mount a spiked bumper.
4.7 Chip discharge
The chain-saw shall be designed so that wood particles are directed below the underside of the saw when it is in
upright position.
4.8 Guide-bar cover
The chain-saw shall be provided with a guide-bar cover for safe transport (see figure 1).
4.9 Noise emission
The time-averaged emission sound pressure levels at the operator's ear shall be measured in accordance with
ISO 7182.
NOTE 1— The sound power levels are for information purposes and will appear in the instruction handbook (see 6.2).
The sound power levels from the chain-saw shall be measured in accordance with ISO 9207.
NOTE 2— It is the intention of ISO/TC 23/SC 17 to collect noise and vibration values, for each machine type, in accordance
with relevant measurement standards. These values will be used to define the "state of the art" levels based on principles to be
established by SC 17. The interaction of noise and vibration on the machine characteristics will be assessed. The relationship
between "state of the art" values and exposure limits will also be considered. For interim noise and vibration values, reference
is made to ISO 11681-1.
4.10 Vibration
The weighted acceleration sum shall be measured and calculated in accordance with ISO 7505.
NOTE — It is the intention of ISO/TC 23/SC 17 to collect noise and vibration values, for each machine type, in accordance
with relevant measurement standards. These values will be used to define the "state of the art" levels based on principles to be
established by SC 17. The interaction of noise and vibration on the machine characteristics will be assessed. The relationship
between "state of the art" values and exposure limits will also be considered. For interim noise and vibration values, reference
is made to ISO 11681-1.
4.11 Throttle trigger
A chain-saw shall be provided with a throttle trigger that, when released, automatically reverts to the idling position
and is retained in that position by the automatic engagement of a throttle trigger lock-out.
The throttle trigger shall be positioned so that it can be pressed and released with a gloved hand while holding the
rear handle.
The throttle control linkage shall be so designed that a force equal to three times the weight of the chain-saw unit
(without cutting attachment and with empty tanks), applied on the rear handle in any direction, shall not increase the
engine speed to a point where the clutch engages and chain movement begins.
If a throttle lock is provided for cold starting, it shall be such that the lock has to be set manually and is automatically
released when the throttle trigger is operated.
5

---------------------- Page: 11 ----------------------

ISO 11681-2:1998(E) © ISO
4.12 Engine-stopping device
The machine shall be fitted with an engine-stopping device by which the engine can be brought to a final stop and
does not depend on sustained manual effort for its operation. The control for this device shall be so positioned that it
can be operated by the right hand while the saw is being held by an operator wearing protective gloves. The
purpose and method of operation of the device shall be clearly and durably marked.
The colour of the device shall clearly contrast with the background.
4.13 Protection against contact with parts under high voltage
Ignition interruption or short-circuiting shall be provided and shall be fitted on the low voltage side.
All high voltage parts of the circuit, including spark plug terminals, shall be electrically protected in such a manner
that the operator cannot make accidental contact with them. The requirement shall be checked by inspection and
using a finger probe as specified in figure 1 in IEC 60335-1:1991.
4.14 Clutch
The clutch shall be so designed that the chain does not run when the engine rotates up to 1,25 times the idling
speed.
4.15 Carburettor adjustment
The elements of carburettor adjustment shall be clearly and indelibly marked, for example by symbols as given in
ISO 3767-5. The markings used shall be illustrated and explained in the instruction handbook.
4.16 Protection against contact with hot parts
Hot parts with the exclusion of the guide-bar and saw chain, shall be guarded so that they are not accessible by
unintentional contact during normal operation of the saw. Such hot parts shall be considered accessible if they can
be reached by the test cone as shown in figure 3.
The temperature of the accessible parts of the machine shall not cause a hazard to the operator; see EN 563:1994,
and especially its annex C.
Dimensions in millimetres
Figure 3 — Test cone
4.17 Exhaust gases
The exhaust outlet shall be located to direct emissions away from the operator's face in normal working positions.
6

---------------------- Page: 12 ----------------------

© ISO ISO 11681-2:1998(E)
4.18 Chain lubrication
The cutting attachment shall be automatically lubricated. If additionally a manual oiler is provided, it shall be located
so it can be operated by the right hand while holding the saw.
4.19 Tank openings
The fuel cap shall have a retainer.
The fuel tank opening shall be at least 20 mm diameter and the oil tank opening at least 15 mm diameter. Each
opening or cap shall be clearly marked. If only the caps are marked, they shall not be interchangeable.
The design of the cap shall be such that no apparent leakage occurs while the saw is at the normal operating
temperature, in all working positions and while being transported.
The filler openings shall be located so that the filling of the tanks with a suitable funnel is not obstructed by other
components.
4.20 Chain tensioning
Chain-saws shall be provided with the means of adjustment to provide chain tension according to the
manufacturer's recommendation.
4.21 Attachment point
Tree service chain-saws shall be equipped with an attachment device which allows the unit to be secured to a rope
or tool strap, as appropriate. The diameter of the opening shall be at least 10 mm. The device shall be capable of
carrying a mass of three times the total chain-saw weight, with full tanks, longest guide-bar and with a chain.
5 Verification of safety requirements
The compliance with safety requirements shall be verified according to table 1.
7

---------------------- Page: 13 ----------------------

ISO 11681-2:1998(E) © ISO
Table 1 — Safety requirements and testing method
Testing method
Subclause Safety requirements
1) 3)
Function Reference
Inspection Measurement
2)
test
4.1 Handles annex B of this part
·· ·
of ISO 11681,
ISO 7915
4.2.1 Protection at the front handle ISO 6533, ISO 6534
··
4.2.2 Protection at the rear handle
ISO 6534
··
4.3 Balance ISO 8334
··
Holding moment annex C of this part
·
of ISO 11681
4.4.1 Protection against injury by
ISO 9518,
··
kickback (chain brake), kickback
ISO 13772
angle or chain stop angle
4.4.2 Protection against injury by
ISO 6535
··
kickback (chain brake), release
force, braking time
4.5 Chain catcher ISO 10726
··
4.6 Spiked bumper
·
4.7 Chip discharge
··
4.8 Guide-bar cover
·
4.9 Noise emission ISO 7182,
·
ISO 9207
4.10 Vibration ISO 7505
·
4.11 Throttle trigger
··
4.12 Engine-stopping device
··
4.13 Protection against contact with
·· ·
parts under high voltage
4.14 Clutch
··
4.15 Carburettor adjustment
·
4.16 Protection against contact with hot
··
parts
4.17 Exhaust gases
··
4.18 Chain lubrication
·
4.19 Tank openings
·· ·
4.20 Chain tensioning
··
4.21 Attachment point
··
1)
Consists of verifying that the machine has the relevant part.
2)
Consists of verifying that the machine or component operates normally.
3)
Consists of determining a value by using some form of device or instrument.
8

---------------------- Page: 14 ----------------------

© ISO ISO 11681-2:1998(E)
6 Information for use
6.1 General
Every chain-saw shall be supplied with information about the use for which it is designed or has been tested and
about any conditions necessary to ensure that it will be safe and without risk to health at all times when it is being
adjusted, used, cleaned or maintained.
6.2 Technical data
6.2.1  The following technical information shall be made available to the user for each chain-saw model.
Mass
Saw without guide-bar and chain, empty tanks: . kg
Volume
Fuel tank: .cm³
Tank for chain lubricating oil: .cm³
Cutting length
All specified usable cutting lengths of guide-bar, specified by the manufacturer: . cm
Chain
Specified pitch: .mm (in)
Specified gauge (thickness of drive links): .mm (in)
Type of chain and guide-bar: .
Sprocket
Specified number of teeth: .
Engine
Engine displacement: .
...