ISO 15442:2012

INTERNATIONAL ISO
STANDARD 15442
Second edition
2012-11-15
Cranes — Safety requirements for
loader cranes
Appareils de levage à charge suspendue — Exigences de sécurité pour
les grues de chargement
Reference number
©
ISO 2012
© ISO 2012
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Published in Switzerland
ii © ISO 2012 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
3.1 Definitions . 2
3.2 Terminology . 6
4 Safety requirements and/or protective measures . 7
4.1 Calculation of rated capacity . 7
4.2 Structural calculation . 8
4.3 Stress analysis .12
4.4 Mechanical arrangements .12
4.5 Hydraulic system .14
4.6 Limiting and indicating devices .16
4.7 Controls .19
4.8 Control stations .20
4.9 Electrical systems and related phenomena.22
4.10 Installation .22
5 Verification of the safety requirements and/or measures .24
5.1 General .24
5.2 Testing and test procedures .27
6 Information for use .30
6.1 General .30
6.2 Manuals .30
6.3 Marking .33
Annex A (informative) List of significant hazards.38
Annex B (informative) Examples of configurations and mountings .41
Annex C (informative) Explanatory notes .46
Annex D (informative) Examples of movements to be prevented in event of overload .47
Annex E (normative) Additional requirements for cableless controls and control systems .49
Annex F (normative) Symbols for working and setting-up functions .51
Annex G (informative) Control system — Preferred vertical layout for controls operated from
the ground .52
Annex H (informative) Control systems — Horizontal layout order .54
Annex I (informative) Control levers for high seats and remote controls .57
Annex J (normative) Cabins fitted on chassis-mounted loader cranes up to load moment of
250 kN · m .59
Annex K (informative) Examples of raised control stations .61
Annex L (normative) Raised control stations — Handrails and handholds, ladders and steps .64
Annex M (informative) Installation of loader cranes on chassis .67
Annex N (normative) User information pertaining to noise .73
Annex O (informative) Stress history parameter s and stress history classes S.74
Bibliography .76
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. 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.
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.
ISO 15442 was prepared by Technical Committee ISO/TC 96, Cranes, Subcommittee SC 6, Mobile cranes.
This second edition cancels and replaces the first edition (ISO 15442:2005), which has been
technically revised.
iv © ISO 2012 – All rights reserved

Introduction
This document is a type-C standard as stated in ISO 12100.
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 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.
Even though a loader crane mounted on a chassis may be considered as a particular type of mobile
crane, with very few exceptions International Standards developed for mobile cranes do not currently
include specific requirements for loader cranes.
This International Standard
— identifies specific safety requirements for loader cranes,
— when applicable, refers to existing International Standards which contain provisions that can be
applied to loader cranes,
— promotes loader crane safety by both identifying specific requirements and referring to existing
applicable standards, so that incorporating all such provisions into the design and use of loader
cranes will guard against and minimize injury to workers and damage to equipment,
— facilitates the work of everyone in the field of loader cranes (designers, supervisors and other
personnel, as well as people directly or indirectly responsible for their safe use and maintenance)
who needs to consult currently available International Standard for loader cranes, and
— contributes to the further international harmonization of loader crane standards.
INTERNATIONAL STANDARD ISO 15442:2012(E)
Cranes — Safety requirements for loader cranes
1 Scope
This International Standard specifies the minimum requirements for the design, calculation, examination
and testing of hydraulic powered loader cranes and their mountings onto chassis or static foundations.
It is applicable to all new loader cranes manufactured one year after its publication. It is not the intent of
this International Standard to require the retrofitting of existing loader cranes.
It is not applicable to loader cranes used on board ships or floating structures or to articulated boom
system cranes designed as a total integral part of special equipment such as forwarders.
It deals with all significant hazards, hazardous situations or hazardous events relevant to loader
cranes, with the exception of hazards related to the lifting of persons, when used as intended and under
conditions of misuse which are reasonably foreseeable by the manufacturer. See Annex A for a list of the
significant hazards.
NOTE The use of cranes for the lifting of persons may be subject to specific national regulations.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 3744, Acoustics — Determination of sound power levels and sound energy levels of noise sources using
sound pressure — Engineering methods for an essentially free field over a reflecting plane
ISO 3864-1, Graphical symbols — Safety colours and safety signs — Part 1: Design principles for safety signs
and safety markings
ISO 4302, Cranes — Wind load assessment
ISO 4306-1, Cranes — Vocabulary — Part 1: General
ISO 4310, Cranes — Test code and procedures
ISO 4413, Hydraulic fluid power — General rules relating to systems
ISO 5353, Earth-moving machinery, and tractors and machinery for agriculture and forestry — Seat index point
ISO 7752-1, Cranes — Control layout and characteristics — Part 1: General principles
ISO 8566-1, Cranes — Cabins and control stations — Part 1: General
ISO 8566-2, Cranes — Cabins — Part 2: Mobile cranes
ISO 11201, Acoustics — Noise emitted by machinery and equipment — Determination of emission sound
pressure levels at a work station and at other specified positions in an essentially free field over a reflecting
plane with negligible environmental corrections
ISO 10245-1, Cranes — Limiting and indicating devices — Part 1: General
ISO 11660-1, Cranes — Access, guards and restraints — Part 1: General
ISO 11660-2, Cranes — Access, guards and restraints — Part 2: Mobile cranes
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13849-1, Safety of machinery — Safety-related parts of control systems — Part 1: General principles
for design
ISO 13854, Safety of machinery — Minimum gaps to avoid crushing of parts of the human body
ISO 13857, Safety of machinery — Safety distances to prevent hazard zones being reached by upper and
lower limbs
ISO 20332, Cranes — Proof of competence of steel structures
IEC 60068-2-64, Environmental testing — Part 2: Test methods — Test Fh: Vibration, broad-band random
(digital control) and guidance
IEC 60204-32:2008, Safety of machinery — Electrical equipment of machines — Part 32: Requirements for
hoisting machines
IEC 61000-6-2, Electromagnetic compatibility (EMC) — Part 6-2: Generic standards — Immunity for
industrial environments
IEC 61000-6-4, Electromagnetic compatibility (EMC) — Part 6: Generic standards — Section 4: Emission
standard for industrial environments
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4306-1, ISO 12100 and the
following apply.
3.1 Definitions
3.1.1
loader crane
powered crane comprising a column that slews about a base, and a boom system that is attached to the
top of the column and which is usually fitted on a vehicle (including trailer) and designed for loading and
unloading the vehicle
[SOURCE: ISO 4306-2:2012, 5.2, modified — Note 3 is not included in the source definition.]
NOTE 1 ISO 3833:1977 defines commercial vehicle as a motor vehicle which, on account of its design and
appointments, is used mainly for conveying goods, and which may also tow a trailer. An example of one type of
commercial vehicle equipped with a loader crane is shown in ISO 4306-2:2012, Figure 9.
NOTE 2 A loader crane installed on another type of vehicle or on a static base is still considered a loader crane.
NOTE 3 Annex B gives examples of boom system configurations and installations.
3.1.1.1
recycling crane
loader crane specifically designed, manufactured and equipped with a grapple for loading/unloading of
recycling materials (e.g. scrap metal)
NOTE Recycling cranes are designed to operate at higher speeds and with higher dynamic loads than other
types of loader crane and these differences are reflected in some of the requirements of this International Standard.
3.1.1.2
timber crane
loader crane specifically designed, manufactured and equipped with a grapple for loading/unloading of
unprepared timber (e.g. tree trunks, branches)
NOTE 1 The operator controls the crane from a high seat or from a cabin.
2 © ISO 2012 – All rights reserved

NOTE 2 Timber cranes are designed to operate at higher speeds and with higher dynamic loads than other types
of loader crane and these differences are reflected in some of the requirements of this International Standard.
3.1.2
articulated movement
movement of boom members pivoting about a pin joint
3.1.3
base
housing incorporating anchoring points and bearings for the slewing column
3.1.4
boom
structural member in the boom system of the loader crane
3.1.4.1
hydraulic boom extension
part of the boom which is capable of hydraulic telescopic movement to vary its length
3.1.4.2
manual boom extension
part of the boom which can be manually extended or retracted
3.1.4.3
boom system
complete system, consisting of booms, boom extensions and cylinders
3.1.5
column
structural member which supports the boom system
3.1.6
control system
interface between the operating levers and the actuating components which provide movements of
the loader crane
3.1.7
control station
position from which the loader crane may be operated
3.1.7.1
raised control station
control station at a height above the ground level, comprising a high seat attached to the column of the
loader crane or a platform positioned above the base of the loader crane
NOTE See Annex K.
3.1.8
crane inclination
angle between the slewing axis and a vertical line, due to working on slanted or uneven ground
3.1.9
danger zone
hazard zone
any space within and/or around machinery in which a person can be exposed to a hazard
[SOURCE: ISO 12100:2010, 3.11.]
3.1.10
dead load
force due to masses of fixed and movable crane parts which act permanently on the structure while the
crane is being used
3.1.11
dynamic pressure
pressure in a hydraulic system component or part of hydraulic system caused by dynamic forces on
actuators when handling the load
3.1.12
fixed load lifting attachment
equipment from which the net load may be suspended and which is fitted directly to the boom head as
an integral part of the crane
3.1.13
flow-sensitive check valve
valve which stops the flow when a pre-set pressure drop level is exceeded
3.1.14
gross load
sum of payload, lifting attachments and if applicable a portion of the hoist rope
3.1.15
high seat
control station connected to the column, consequently rotating with the crane
3.1.16
hoist
machine for lifting and lowering suspended loads over predetermined distances, using ropes, chains or belts
3.1.17
hydraulic line rupture
failure of a hydraulic line which results in a loss of pressure in the line
3.1.18
load holding valve
valve which is normally closed and is opened by an external force to enable flow of fluid out of a
hydraulic actuator
3.1.19
main relief valve
valve which limits the pressure supplied to the hydraulic system of the crane
3.1.20
maximum working load
maximum load that may be lifted
NOTE It is the largest load appearing in the load plate.
3.1.21
maximum working pressure
maximum pressure in pump circuit or individual working function
3.1.22
net lifting moment
rated capacity multiplied by outreach
3.1.23
non-fixed load lifting attachment
lifting accessory which can be fitted directly or indirectly to the hook or any other coupling device of a
crane by the user without affecting its integrity
3.1.24
outreach
horizontal distance between the axis of rotation of the column and point of load attachment
4 © ISO 2012 – All rights reserved

3.24.1.1
hydraulic outreach
outreach which can be obtained with hydraulically actuated parts of the boom system
3.1.25
payload
load which is lifted by the crane and suspended from the non-fixed load-lifting attachment(s) or, if such
an attachment is not used, directly from the fixed load-lifting attachment(s)
3.1.26
port relief valve
valve which limits the pressure supplied to a hydraulic actuator
3.1.27
pressure relief valve
valve which automatically relieves the hydraulic oil to the tank when the pressure exceeds a specified value
3.1.28
rated capacity
load that the crane is designed to lift for a given operating condition (e.g. configuration, position of the load)
3.1.29
rated capacity indicator
device which gives, within tolerance limits specified in 4.6.3.2, at least a continuous indication that the
rated capacity is exceeded, and another continuous indication (on certain crane types) of the approach
to the rated capacity
3.1.30
rated capacity limiter
system that automatically prevents the crane from handling loads in excess of its rated capacity
NOTE See also Annex C.
3.1.32
setting-up function
crane function used to prepare the crane for lifting
3.1.33
sink rate
distance in a given time at which the load lowers due to internal leakage of hydraulic components
3.1.34
slewing
rotational movement of the column and boom system about the axis of the column
3.1.35
stabilizer
aid to the supporting structure connected to the base of the crane or to the chassis to provide stability,
without lifting the chassis from the ground
3.1.35.1
stabilizer extension
part of the stabilizer capable of extending the stabilizer leg laterally from the transport position to the
operating position
3.1.35.2
stabilizer leg
part of the stabilizer capable of contacting the ground to provide the required stability
3.1.36
static foundation
fixed support incorporating mounting points for a crane
3.1.37
total lifting moment
sum of net lifting moment and the moment produced by dead loads
3.2 Terminology
See Figure 1.
6 © ISO 2012 – All rights reserved

Key
1 base 12 2nd manual boom extension
2 stabilizer extension 13 load hook
3 stabilizer leg 14 controls
4 slewing mechanism 15 stabilizer foot
5 column 16 3rd boom attachment
6 1st boom 17 3rd boom
7 1st boom cylinder 18 3rd boom cylinder
8 2nd boom 19 3rd hydraulic boom extension
9 2nd boom cylinder 20 3rd boom extension cylinders
10 2nd hydraulic boom extension 21 load hook
11 2nd boom extension cylinders 22 3rd manual boom extension
Boom systems consist of items 6 to 12 plus items 16 to 22, as applicable.
Figure 1 — Main parts of loader crane
4 Safety requirements and/or protective measures
Machinery shall comply with the safety requirements and/or protective measures of this clause.
In addition, the machine shall be designed according to the principles of ISO 12100 for relevant but not
significant hazards which are not dealt with by this International Standard.
4.1 Calculation of rated capacity
The rated capacity shall be calculated from the following:
a) the working pressure in the cylinders;
b) the area of the load-carrying cylinders;
c) the kinematics;
d) dead loads;
e) load combinations;
f) hoist loads.
For the purpose of the calculations, rated capacity is equal to gross load.
4.2 Structural calculation
4.2.1 Information to be given in the calculation
The following information shall be given in the calculation:
a) type of crane and method of operation;
b) the assumed number of all load or working cycles;
c) details of the load-carrying system reflecting actual service conditions, including outline drawings
and principal dimensions;
d) the assumed loading conditions, including maximum crane inclination;
e) the governing hoisting class, hoist drive class and stress history classes or stress history parameters;
f) the material for the individual components and joints;
g) the shapes, dimensions and static cross-section values of all load-carrying members;
h) the analyses, separately for the individual structural components and essential connections.
4.2.2 Dynamic factors
4.2.2.1 Hoisting and gravity effects of the mass of the crane
The dynamic effects due to vibrations of the structure when raising or lowering a load shall be included
in the loading by applying the factor, ϕ , to the gravitational forces due to the masses of the crane. It shall
be used for the design of the crane structure itself and its supports. For load combinations A1, B1 and C1,
the value of ϕ shall be the lowest of the two values 1,1 and ϕ , expressed as
1 2
φφ=min,()11; (1)
For load combinations A2 and B2, the value of ϕ shall be 0,95.
Although generally ϕ = 1,1, it shall not exceed the value of ϕ (see 4.2.2.2) when ϕ is less than 1,1.
1 2 2
4.2.2.2 Hoisting and gravity effects of the gross load
In the case of hoisting or grounding a load as well as starting or stopping a vertical motion, the vibration
effects shall be included in the loading by multiplying the gravitational force due to the mass of the hoist
load by a factor, ϕ .
Factor ϕ shall be taken as
φφ=+βν× (2)
22minh2
ϕ and β are given in Table 1 for the appropriate hoisting class. Loader cranes are assigned to
2,min 2
hoisting classes HC1 and HC2 in accordance with their dynamic and elastic characteristics:
— HC1 for crane mounted on a chassis or structures of equivalent flexibility;
— HC2 for rigidly mounted cranes.
8 © ISO 2012 – All rights reserved

Rigidly mounted cranes equipped with a device that limits the peak pressure (e.g. an accumulator) in
the first boom cylinder may be assigned to HC1.
Table 1 — Values of β and ϕ
2 2,min
Hoisting class of appliance β ϕ
2 2,min
HC 1 0,17 1,05
HC 2 0,34 1,10
ν is the steady vertical hook speed, in metres per second, related to the lifting attachment. Values of ν
h h
are given in Table 2.
Table 2 — Values of ν
h
Type of hoist drive and its operation method
Load combination
HD1 HD4 HD5
A1, B1 v 0,5v v = 0
h,max h,max h
C1 v v 0,5v
h,max h,max h,max
HD1 is the hoist drive can only be operated at a fixed speed
HD4 is the start of the lift is performed with continuously increasing speed
HD5 is the hoist drive control is automatic and ensures that the speed influence on the dynamic force is negligible
ν is the maximum vertical hook speed
h,max
In load combinations A1 and B1, ν is the maximum vertical hook speed that is given by any single
h,max
hydraulic drive action.
In load combination C1, ν is the maximum vertical hook speed from all articulation hydraulic drives
h,max
acting simultaneously.
NOTE 1 In load combinations A and B it is assumed that the dynamic peaks from simultaneous movements
do not coincide. The unlikely event that the dynamic peaks coincide and are superimposed is covered by load
combination C1.
NOTE 2 Dynamic factor ϕ can be calculated using rigid body kinetics or determined by experimental means.
4.2.2.3 Effect of sudden release of a part of the gross load
For cranes that release or drop a part of the gross load as a working procedure during intended use,
such as when grabs or magnets are used, the peak dynamic effect on the crane can be simulated by
multiplying the gross load by a factor, ϕ , the value of which is given by
Δm×−1 β
()
φ = (3)
m
where
m is the mass of the gross load;
∆m is the released or dropped part of the gross load;
β = 0,5 for cranes equipped with grabs or similar slow-release devices;
β = 1,0 for cranes equipped with magnets or similar rapid-release devices.
4.2.2.4 Effects caused by acceleration/deceleration of the slewing drive
Dynamic factor ϕ shall have the value 1,05 for hook duty and 1,3 for bucket or grapple duty.
5h
4.2.3 Loads and forces
4.2.3.1 General
The following loads and forces shall be taken into account:
a) regular loads:
1) dead loads (3.10);
2) gross loads (3.14);
3) dynamic forces;
4) centrifugal forces;
b) occasional loads:
1) in-service wind loads;
2) other climatic and environmental effects such as temperature, snow and ice;
3) loads on stairways, platforms and hand rails;
c) exceptional loads:
1) test loads;
2) loads caused by movements suddenly stopped by a mechanical device, e.g. end stroke of slewing
cylinder or a safety device, e.g. emergency stop, hydraulic line rupture valve;
3) sudden release of the load, e.g. rope failure, sling failure;
4) forces due to simultaneous dynamic peaks caused by raising or lowering a load at the maximum
sum of the vertical speeds from all articulation drives.
4.2.3.2 Regular loads
4.2.3.2.1 Forces due to acceleration/deceleration of the slewing drive
The horizontal loads from the masses of the crane and of the payload shall be calculated from
Fm=×g×≥tanαα 3° (4)
hi i
where
F is the horizontal load i acting on the payload or a mass point of the boom;
hi
m is the payload or mass point of boom;
i
g is the acceleration due to gravity;
α is the maximum inclination for the crane in accordance with the manufacturer’s specifi-
cation.
However, the minimum value that may be used is α = 3°.
10 © ISO 2012 – All rights reserved

4.2.3.2.2 Centrifugal forces (see Table 3)
The centrifugal forces acting on slewing cranes shall only be calculated from the dead load of the boom
system components, the counterweight, if applicable, and the gross load without applying the factors
mentioned in 4.2.2.
4.2.3.2.3 Forces on stabilizer legs
The stabilizer legs shall be loaded by simultaneously-acting vertical and horizontal forces. The horizontal
force shall act on the stabilizer foot with the leg at its maximum length and in the most unfavourable
direction. The magnitude of the horizontal force shall be at least 5 % of the vertical force.
4.2.3.3 Occasional loads
4.2.3.3.1 Wind loads
Wind loads shall be calculated according to ISO 4302. Only in-service wind need be applied.
4.2.3.3.2 Loads on stairways, platforms and hand rails
See 4.8.2.
4.2.3.4 Exceptional loads
Such loads may act in exceptional situations (e.g. testing, hydraulic line rupture).
4.2.4 Load combinations
4.2.4.1 Basic load combinations
Loads shall be combined to determine the stresses the crane will experience during operation. Basic
load combinations are given in Table 3.
NOTE In general, load combinations A cover regular loads, load combinations B cover regular loads combined
with wind loads, and load combinations C cover regular loads combined with occasional and exceptional loads.
4.2.4.2 Load combinations covered (see Table 3)
A1 and B1 are the intended service conditions, raising/lowering loads with dynamic peak from any
single hydraulic function while slewing: A1 without wind effects, B1 with wind effects.
A2 and B2 are the intended service conditions, with grapple, magnet or similar accessory allowing
sudden release of a part of the gross load while slewing: A2 without wind effects, B2 with
wind effects.
C1 represents the simultaneous dynamic peaks caused by raising or lowering a load at the
maximum sum of the vertical speeds from all articulation drives, taking into account the
available oil flow.
C3 is the crane-under-test condition.
4.2.4.3 Application of Table 3
Basic load combinations for the calculation to prove that mechanical hazards from yielding and elastic
instability from extreme values do not occur are given in Table 3.
For the proof of fatigue strength, load combinations A1 and A2, with all partial safety factors, γ , set to
p
1,00, shall be applied.
Table 3 — Load combinations to be covered
Load comb. A Load comb. B Load comb. C Row
Load cat-
Load
egory
γ A1 A2 γ γ A1 A2 γ γ A1
p p p p p
Moved
masses of 1,22 ϕ ϕ 1,16 ϕ ϕ 1,1 ϕ 1 1
1 1 1 1 1
Gravity, accel-
the crane
eration of
lifting drives
Mass of the
1,34 ϕ ϕ 1,22 ϕ ϕ — — — 2
2 3 2 3
gross load
Moved
masses of 1,22 ϕ ϕ 1,16 ϕ ϕ — — — 3
5h 5h 5h 5h
Acceleration
Regular
the crane
of slewing
drive
Mass of the
1,34 ϕ ϕ 1,22 ϕ ϕ — — — 4
5h 5h 5h 5h
gross load
Masses of
1,22 1 1 1,16 1 1 — — — 5
the crane
Centrifugal
a
loads
Mass of the
1,34 1 1 1,22 1 1 — — — 6
gross load
Climate In service
Occasional — — — 1,22 1 1 — — — 7
b
effects wind
Forces due to one excep-
Exceptional — — — — — — 1,1 ϕ 1 8
tional event
a
Only centrifugal loads that increase the load effects shall be included.
b
Forces acting simultaneously with wind forces shall only be applied to such an extent that the drive force in rows 3 and
4 is not exceeded.
4.3 Stress analysis
The competence of the steel structure should be assessed in accordance with ISO 20332. Alternatively,
any other advanced and recognized standard, which conforms to similar principles, may be used. If a
standard based on the allowable stress method is used, the partial safety factors, γ , in Table 3 shall
p
be set to 1, and 1.5 shall be used as the overall safety factor. For fatigue classification according to
ISO 20332, see Annex O.
4.4 Mechanical arrangements
4.4.1 Stabilizers
Stabilizers shall be provided when needed to fulfil the stability requirements (see 4.10.3) when loader
cranes are fitted on chassis.
4.4.1.1 Stabilizer leg
The stabilizer leg shall have means (e.g. foot plate) for ground support. The stabilizer foot plate shall
be constructed to accept ground unevenness of at least 10°. The area of each foot shall be such that the
resultant maximum ground pressure is less than 4 MPa. For the main stabilizers, the maximum ground
pressure, P, shall be calculated as
M
dyn
P= (5)
LA×
where
12 © ISO 2012 – All rights reserved

M is the maximum moment at slewing centre including dynamic factors;
dyn
L is the distance from slewing centre to stabilizer leg;
A is the area of stabilizer foot.
The feet of auxiliary stabilizers shall have the same size as for the main stabilizers. Alternatively, a
detailed calculation of the entire installation shall be carried out or stabilizers forces shall be measured.
When the stabilizer leg has a tilting device, locking means which can withstand operational forces from
intended use (e.g. pins) shall be provided to secure the leg in both the working and transport position
(see 4.4.3). If stabilizer legs have to be tilted (rotated) up or down manually, the maximum force to
activate any one of them shall not exceed 250 N, measured at the stabilizer foot.
4.4.1.2 Stabilizer extension
Stabilizer extensions shall be marked to show when they are correctly deployed. Manually operated
extensions shall be fitted with
a) handles for manual operation,
b) devices for locking extensions in the working and transport positions (see 4.4.3), and
c) pull-out stops.
Locking means in the working position shall be fitted if the hydraulic cylinders are not able to resist the
forces during the load handling.
4.4.2 Manual boom extensions
Manual boom extensions shall have pull-out stops and mechanical locking means for their retracted and
extended positions.
4.4.3 Securing for transport
4.4.3.1 General
An indicator (e.g. angle sensor) detecting the boom system in the transport position shall be
provided, see 4.6.7.
Locking means shall be provided to prevent uncontrolled movements of the crane and stabilizers
installed on chassis when travelling.
Each of the stabilizer extension locking devices shall be designed to withstand, with no permanent
deformation, the forces resulting from an acceleration of 2g, applied in the direction of the movement.
4.4.3.2 Manually operated extensions
Manually operated stabilizer extensions shall be locked in the transport position by two separate locking
devices for each stabilizer, at least one of which shall be automatically operated, e.g. a spring-operated
cam lock and an automatic spring latch. These shall be attached to the crane and/or stabilizers and shall
be protected against unintentional removal, e.g. by locking pins with spring clips.
It shall be clearly visible to the operator when the manual locking devices are in the locked and
unlocked positions. In addition, it shall be indicated when the stabilizers are not locked in the transport
position, see 4.6.7.
4.4.3.3 Hydraulically operated extensions
Hydraulically operated stabilizer extensions shall be fitted with an automatic hydraulic or automatic
mechanical locking device for the transport position, in addition to a control valve that is closed in its
neutral position. Any valve used for automatic hydraulic locking shall be in accordance with 4.5.6.1. A
mechanical locking device shall be designed to withstand, without permanent deformation, the force
due to attempting to extend the stabilizers with the locking devices engaged.
4.4.4 Hoists
4.4.4.1 Protection against overload
Where a power-driven hoist is fitted, the crane shall be fitted with a rated capacity limiter. The capability
of the hoist shall be included in the safety function of the rated capacity limiter (see 4.6.3) to ensure that
the hoist cannot be overloaded by movements of the crane (e.g. by driving the boom extension against
the hook block), and the crane cannot be overloaded by the hoist.
4.4.4.2 Rope spooling
Hoist drums with rope grooves are preferred to facilitate proper spooling of the rope onto the drum.
4.4.4.3 Unintentional lowering of the load
Hoists shall be protected against unintentional lowering of the load, for example, following a hydraulic
line rupture or a power failure.
4.4.4.4 Rope anchorage
Where the rope anchorage to the drum cannot withstand the maximum hoisting load, a lowering limiting
device which keeps at least three full turns of rope on the drum shall be fitted.
4.4.4.5 Rope tension
Means shall be provided to maintain some rope tension when the hoist is under no load.
4.4.5 Load hooks
Hooks shall be designed in accordance with the state of the art.
NOTE More information can be found in CEN/TS 13001-3-5.
Hooks shall be such that the unintentional detachment of the load is prevented. This can be achieved by
— a safety device, or
— the shape of the hook.
Hooks equipped with a safety-latch fulfil these requirements.
4.5 Hydraulic system
4.5.1 General
The hydraulic system and components shall comply with the requirements of ISO 4413.
The hydraulic components and lines shall be dimensioned such that the hydraulic system can be operated
at the intended working pressure (including any pressure required during test procedures) without any
failures and excessive temperatures being created.
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Hydraulic systems shall be designed such that all components are compatible with each other and with
the fluid being used in the system at specified environmental conditions. The hydraulic system shall
have adequate filters to ensure that the fluid does not become contaminated.
Each hydraulic circuit shall be provided with a means for checking the pressure.
Pressure and flow control devices or their enclosures shall be fitted with tamper-evident devices where
an unauthorized alteration to pressure or flow can cause a hazard. Means shall be supplied for locking the
setting of adjustable components or of locking their enclosures, if changes or adjustment can cause a hazard.
4.5.2 Pump
A pump shall have the capacity to deliver the correct flow and pressure specified by the crane manufacturer
for the hydraulic system when being driven at the specified speed. The pump size and its specified driven
speed shall be chosen to ensure that the capacity of the power supplier is utilized efficiently.
NOTE See Annex M for guidance on selecting the correct pump size.
The pump shall be suitable for the fluid specification used in the hydraulic system.
4.5.3 Hydraulic reservoir
The hydraulic reservoir shall be specified by the crane manufacturer and shall have sufficient fluid
capacity for the pump to operate correctly when all the hydraulic cylinders are fully extended. There
shall also be sufficient capacity for the fluid in the system when all the cylinders are retracted. Devices
shall be incorporated to enable monitoring of the maximum and minimum fluid levels. An access opening
and a drain valve with plug shall be provided for cleaning purposes.
4.5.4 Pressure-relief valves
Each load-carrying circuit shall be equipped with an automatic means (e.g. port relief valves) that limits
the pressure to a maximum of 25 % above the maximum working pressure or shall be designed to
withstand the maximum pressure that can occur under foreseen operating conditions.
The minimum setting of the pressure relief valves, except for timber and recycling cranes (see 4.5.6.1
and 4.5.6.2), shall be such that no uncontrolled movement can take place with loads up to 1,2 times the
rated capacity.
4.5.5 Hoses, tubes and fittings
Burst pressure for hoses shall be a minimum of four times the maximum working pressure for hoses
without end fittings. Burst pressure of the raw material for tubes between lock valve and actuator shall
be a minimum of three times the maximum working pressure.
Hoses, tubes and fittings shall be so located, installed and, where appropriate, protected such that they
do not sustain damage by chafing, trapping, etc.
Hydraulic hoses containing fluid with a pressure of more than 5 MPa and/or having a temperature over
50 °C and which are located within 1 m of the operator, shall be guarded.
Any part or component which may divert a possible jet of fluid can be considered as a sufficient
protection device.
Hoses intended to withstand a pressure of more than 15 MPa shall not be fitted with reusable end fittings.
Hydraulic hoses that are used for the connection of interchangeable equipment shall be designed or
identified or located to avoid any incorrect connection causing a hazard, e.g. to reverse the direction of
movement of a hydraulic cylinder
4.5.6 Precautions against hydraulic line rupture
4.5.6.1 Loader cranes other than timber and recycling cranes
All load-carrying circuits shall be equipped with an automatic means, e.g. load-holding valves, to prevent
uncontrolled movement of the crane in the case of hydraulic line rupture. Flow-sensitive check valves
shall be used only for equalizing and pressure sensing lines. The maximum flow through these lines
shall not exceed 3 l/min.
Valves used for this means shall be close coupled to the cylinder. They shall be either
a) integral with the cylinder,
b) directly and rigidly flange mounted, or
c) placed close to the cylinder or connected to it by means of rigid tubes.
For tubes and fitting between the lock valve and actuator, the safety factor shall be 3, calculated against
the maximum
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