ISO 5700:2013

INTERNATIONAL ISO
STANDARD 5700
Fifth edition
2013-05-01
Tractors for agriculture and
forestry — Roll-over protective
structures — Static test method and
acceptance conditions
Tracteurs agricoles et forestiers — Structures de protection contre le
retournement — Méthode d’essai statique et conditions d’acceptation
Reference number
©
ISO 2013
© ISO 2013
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ii © ISO 2013 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 4
5 Apparatus . 4
5.1 Horizontal loading tests . 4
5.2 Crushing tests . 8
6 Preparation of tractor and ROPS for testing . 9
7 Test procedures .10
7.1 Sequence of tests .10
7.2 Horizontal loading from rear, front and side.11
7.3 Crushing tests .15
7.4 Second longitudinal loading .18
8 Determination of seat index point (SIP), seat location and adjustment for test .18
8.1 Seat index point .18
8.2 Seat location and adjustment for test .18
9 Clearance zone .19
9.1 Determination of the clearance zone .19
9.2 Determination of the clearance zone for tractors with a non-reversible seat .20
9.3 Determination of the clearance zone for tractors with a reversible driver’s position .21
9.4 Optional seats.22
10 Tolerances .22
11 Acceptance conditions .23
11.1 General .23
11.2 Clearance zone .23
11.3 Recording permanent deflection .23
11.4 Required force .23
11.5 Overload test .23
11.6 Additional conditions .25
11.7 Cold weather embrittlement .25
12 Seatbelt anchorage performance .26
13 Labelling .26
14 Extension to other tractor models .26
14.1 Administrative extension .26
14.2 Technical extension .26
15 Test report .27
Annex A (normative) Optional requirements for providing resistance to brittle fracture of roll-
over protective structure at reduced operating temperature .28
Annex B (normative) Test report for roll-over protective structure .30
Annex C (informative) Designation of Maintenance Agency .36
Bibliography .37
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. 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. 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.
The committee responsible for this document is ISO/TC 23, Agriculture and forestry machinery,
Subcommittee SC 2, Common tests.
This fifth edition cancels and replaces the fourth edition (ISO 5700:2006), which has been technically
revised for the technical harmonization with OECD Code 4:July 2012.
iv © ISO 2013 – All rights reserved

Introduction
Testing of roll-over protective structures (ROPS) for wheeled or tracked tractors for agriculture and
forestry aims at avoiding or limiting risks to the driver resulting from accidental overturning during
normal operation (e.g. field work) of the tractor. The strength of the ROPS is tested by applying static
loads and a static crushing test to simulate actual loads which can be imposed on the cab or frame when
the tractor overturns either to the rear or to the side without free fall. The tests allow observations to be
made on the strength of the structure and the attachment brackets to the tractor and also of the tractor
parts that could be affected by the load imposed on the structure.
Provision is made to cover both tractors with the conventional forward-facing driver’s position only,
as well as those with a reversible driver’s position. For tractors with a reversible driver’s position, a
clearance zone is defined to be the combined clearance zones for the two driving positions. The point of
application of the side loading is determined as the mid-point between the seat index points measured
in the two positions.
It is recognized that there could be tractor designs — for example, lawn-mowers, narrow vineyard
tractors, low profile tractors used in low buildings with limited overhead clearance, orchards, etc., stilt
tractors and certain forestry machines such as forwarders — for which this International Standard is
not appropriate.
This International Standard specifies technical performance requirements, associated test procedures
and performance test report information. Technical harmonization with OECD is ensured by the
Maintenance Agency operating as specified in Annex C.
[6] [7]
NOTE For narrow-track wheeled tractors, see ISO 12003-1 and ISO 12003-2.
INTERNATIONAL STANDARD ISO 5700:2013(E)
Tractors for agriculture and forestry — Roll-over protective
structures — Static test method and acceptance conditions
1 Scope
This International Standard specifies a static test method and the acceptance conditions for roll-over
protective structures (cab or frame) of wheeled or tracked tractors for agriculture and forestry.
It is applicable to tractors having at least two axles for wheels mounted with pneumatic tyres, or having
tracks instead of wheels, with an unballasted tractor mass of not less than 600 kg and a minimum track
width of the rear wheels greater than 1 150 mm. It is not applicable to tractors having a mass ratio
(maximum permissible mass / reference mass) greater than 1,75.
2 Normative references
The following referenced documents are indispensable for the application 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 630-1:2011, Structural steels — Part 1: General technical delivery conditions for hot-rolled products
ISO 5353:1995, Earth-moving machinery, and tractors and machinery for agriculture and forestry —
Seat index point
ASTM A370, Standard Test Methods and Definitions for Mechanical Testing of Steel Products
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
roll-over protective structure
ROPS
framework (safety cab or frame) protecting drivers of tractors for agricultural and forestry that avoids
or limits risk to the driver resulting from accidental overturning during normal operation
Note 1 to entry: The ROPS is characterized by the provision of space for a clearance zone, as defined in 9.1, either
inside the envelope of the structure or within a space bounded by a series of straight lines from the outer edges
of the structure to any part of the tractor that might come into contact with flat ground and that is capable of
supporting the tractor in that position if the tractor overturns.
3.2
unballasted tractor mass
mass of the tractor in working order with tanks and radiators full, roll-over protective structure with
cladding, and any track equipment or additional front-wheel drive components required for normal use
Note 1 to entry: Not included are the operator, optional ballast weights, additional wheel equipment, special
equipment and loads.
3.3
reference mass
m
t
mass, not less than the unballasted mass, selected by the manufacturer for calculation of the energy
inputs and crushing forces to be used in the tests
Note 1 to entry: The reference mass shall not be less than the unballasted mass and must be sufficient to ensure
the mass ratio does not exceed 1,75.
3.4
maximum permissible mass
technically permissible mass
maximum allowable equipment mass and allowable payload specified by the manufacturer
Note 1 to entry: This mass corresponds to the sum of the technically maximum possible axle loads.
3.5
mass ratio
number calculated by taking the maximum permissible mass divided by reference mass
3.6
horizontal loading test
application of a horizontal load to the rear, front and side of the roll-over protective structure
3.7
crushing test
application of a vertical load through a beam placed laterally across the uppermost members of the roll-
over protective structure
3.8
longitudinal median plane
longitudinal plane of symmetry
zero Y plane
vertical plane Y passing through the mid-points of AB, perpendicular to AB, A and B being such that
— for each wheel, the vertical plane passing through its axis cuts the mid-plane of the wheel following
a straight line Δ which meets the supporting surface of the vehicle at one point, and
— A and B are two points thus defined which correspond to two wheels, both of which are either
steering or powered wheels, situated respectively at the two ends of the same real or imaginary axle
See Figure 1.
Note 1 to entry: The mid-plane of the dual wheels being equidistant from the inner edge of one wheel and the
outer edge of the other, the straight line Δ is, in this particular case, the intersection of the mid-plane of the dual
wheels and the vertical plane passing through the axis of the axle pin.
Note 2 to entry: Adapted from ISO 612:1978, Clause 5.
Note 3 to entry: The longitudinal median plane may also be applied to track-laying tractors.
2 © ISO 2013 – All rights reserved

Figure 1 — Longitudinal median plane
3.9
track width
distance between the median planes of the wheels or tracks
Note 1 to entry: If A and B are the two points thus defined for the wheels on the same axle of the tractor, then the
track width is the distance between points A and B. The track may be defined for both front and rear wheels.
Note 2 to entry: Where there are dual wheels, the track width is the distance between two planes, each of which
is the median plane of the pairs of wheels.
Note 3 to entry: For track-laying tractors, the track width is the distance between the median planes of the tracks.
3.10
vertical reference plane
plane established before any application of loading, generally longitudinal to the tractor, passing through
the seat index point (SIP) and the steering-wheel centre and which is used for establishing the resultant
load point in crush loading tests
Note 1 to entry: When a steering wheel does not exist, a vertical plane passing through the SIP and parallel to the
longitudinal median plane of the tractor is used. Normally, the reference plane coincides with the longitudinal
median plane of the tractor.
3.11
seat reference plane
vertical plane generally longitudinal to the tractor, passing through the seat index point and to the
steering wheel centre and which is used for establishing the clearance zone
Note 1 to entry: This plane is established at the beginning of the series of tests and normally coincides with the
longitudinal median plane of the tractor. This plane is assumed to move horizontally with the seat and steering
wheel during loading but to remain perpendicular to the tractor or the floor of the ROPS if the latter is resiliently
mounted. When a steering wheel does not exist, a vertical plane passing through the SIP and parallel to the
longitudinal median plane of the tractor is used.
3.12
wheelbase
distance between the vertical planes passing through the two lines AB, as defined in 3.8, one for the
front wheels and one for the rear wheels
3.13
agricultural tractor
self-propelled agricultural vehicle having at least two axles, or a track-laying agricultural vehicle, and
having a maximum design speed of not less than 6 km/h, particularly designed to pull, push, carry and
operate implements used for agricultural work (including forestry work), which may be provided with
a detachable loading platform
Note 1 to entry: It may be equipped with one or more seats.
4 Symbols and abbreviated terms
For the purposes of this document, the symbols in Table 1 apply.
Table 1 — Symbols
Symbol Description Unit
a Half of the horizontal seat adjustment mm
h
a Half of the vertical seat adjustment mm
v
D Deflection of the ROPS for the calculated basic energy required at the point of, and in line mm
with, the load application
D’ Deflection of the protective structure for the calculated energy required mm
E Energy input to be absorbed during first longitudinal loading J
il1
E Energy input to be absorbed during second longitudinal loading J
il2
E Energy input to be absorbed during side loading J
is
F Static load force for the basic energy required N
F Maximum static load force occurring during loading (excluding overload) N
max
F’ Force for the calculated energy required N
F Applied force at front in the crushing test N
f
F Applied force at rear in the crushing test N
r
m Reference mass kg
t
W Width of the ROPS mm
5 Apparatus
5.1 Horizontal loading tests
5.1.1 Material, equipment and attachment means for ensuring that the tractor chassis is firmly fixed to
the ground and supported independently of the tyres.
5.1.2 Means of applying a horizontal force to the roll-over protective structure, such as are shown in
Figures 2, 3 and 4, complying with the requirements of 5.1.2.1 to 5.1.2.4.
4 © ISO 2013 – All rights reserved

Key
1 rear load
2 seat index point
3 front load
4 second longitudinal load, front or rear
5 seat reference plane, longitudinal median plane
6 longitudinal load, rear or front
Figure 2 — Front and rear load application
Dimensions in millimeters
Key
1 seat index point
2 point of side load application (see 7.2.3)
3 deflection due to rear longitudinal loading
4 seat reference plane, longitudinal median plane
5 load
Figure 3 — Side load application: Protective cab
Dimensions in millimeters
Key
1 seat index point
2 deflection due to rear longitudinal loading
3 point of side load application (see 7.2.3)
Figure 4 — Side load application: Rear roll bar frame
6 © ISO 2013 – All rights reserved

5.1.2.1 It shall be ensured that the load can be uniformly distributed normal to the direction of loading
and along a beam of length between 250 mm and 700 mm, in an exact multiple of 50 mm.
5.1.2.2 The edges of the beam in contact with the roll-over protective structure shall be curved with a
maximum radius of 50 mm.
5.1.2.3 Universal joints, or the equivalent, shall be incorporated to ensure that the loading device does
not constrain the structure in rotation or translation in any direction other than the loading direction.
5.1.2.4 Where the roll-over protective structure’s length, covered by the appropriate load-applying
beam, does not constitute a straight line normal to the load application direction, the space shall be
packed so as to distribute the load over this length.
5.1.3 Equipment for measuring force and deflection along the direction of application of the force and
relative to the tractor chassis. To ensure accuracy, measurements shall be taken as continuous recordings.
The measuring devices shall be located so as to record the force and deflection at the point of, and along
the line of, loading.
5.1.4 Means of proving that the clearance zone has not been entered during the test. A measuring rig
based on the clearance zone as shown in Figure 5 may be used. The dimensions are given in Table 2.
B A
1 1
I
C
1 A
B
I
C
A
B
C I
2 2
D
H
D
G
J
1 H
D
G
J
H
J G
2 2
F
E
F
E
F
E
2 1
Key
1 seat index point
Figure 5 — Clearance zone measuring rig
Table 2 — Dimensions for the Clearance zone measuring rig shown in Figure 5
Dimensions Remarks
mm
AA 

100 Minimum

BB


AA 

BB 500


CC
12 
Minimum or equal to the
DD  

steering-wheel radius plus 40 mm,
500 

EE
 
12 
whhichever is greater

FF 

GG
12 

HH 500


II


JJ
12 
Minimum or equal to the

EE 
10
steering-wheel radius plus 40 mm,



EE

 whhichever is greater

J E 300
0 0
F G —
0 0 

I G —
0 0 

Depending on the tractor

C D —
0 0



E F —
0 0

Note  For other dimensions, see Figure 13.
5.2 Crushing tests
5.2.1 Material, equipment and attachment means for ensuring that the tractor chassis is firmly fixed to
the ground (and supported) independently of the tyres.
5.2.2 Means of applying a downwards force on the roll-over protective structure, such as that shown in
Figure 6, including a stiff beam with a width of 250 mm.
5.2.3 Means of proving that the clearance zone has not been entered during the test. A measuring rig
based on the clearance zone as shown in Figure 5 may be used.
5.2.4 Equipment for measuring the total vertical force applied.
8 © ISO 2013 – All rights reserved

Key
1 force
2 universal pin joints
3 hydraulic cylinder
4 supports under front and rear axles
5 crushing beam
Figure 6 — Example of arrangement for crushing test
6 Preparation of tractor and ROPS for testing
6.1 The protective structure may be manufactured either by the tractor manufacturer or by an
independent firm. In either case, a test is only valid for the model of tractor on which it is carried out.
6.2 The protective structure shall be retested for each model of tractor to which it is to be fitted.
However, testing stations may certify that the strength tests are also valid for tractor models derived from
the original model by modifications to the engine, transmission and steering and front suspension. On the
other hand, more than one protective structure may be tested for any one model of tractor.
NOTE See Clause 14 for extension to other tractor models.
6.3 The roll-over protective structure shall be manufactured to production specifications and shall be
fitted to the appropriate tractor model chassis in accordance with the manufacturer’s declared attachment
method to form the assembly.
6.4 This assembly shall be secured to the bedplate so that the members connecting the assembly and
the bedplate do not deflect significantly in relation to the ROPS under loading. The assembly shall not
receive any support under loading other than that due to the initial attachment.
6.5 A track width setting for the rear wheels, if present, shall be chosen such that there is no interference
with the ROPS during testing.
6.6 The assembly shall be supported and secured or modified so that all the test energy is absorbed by
the roll-over protective structure and its attachment to the tractor rigid components.
6.7 Deflection of the chassis integral components is permissible during the ROPS test. Any members
that absorb energy during the ROPS test should be noted in the test report.
6.8 All windows, panels and removable non-structural fittings shall be removed so that they do not
contribute to the strength of the ROPS.
In cases where it is possible to fix doors and windows open or remove them during work, they shall be
either removed or fixed open for the test, so that they do not add to the strength of the ROPS. It shall be
noted whether, in this position, they would create a hazard for the driver in the event of overturning.
6.9 Any component of the tractor contributing to the strength of the protective structure, such as
mudguards, which has been reinforced by the manufacturer, should be described and its measurements
given in the test report.
6.10 Where a “tandem” tractor (e.g. articulated tractor) is concerned, the mass of the standard version
of that part to which the ROPS is fitted shall be used.
6.11 The ROPS shall be instrumented with the necessary equipment to obtain the required force-
deflection data.
7 Test procedures
CAUTION — Take adequate protection to protect personnel during tests. Some of the tests
specified in this international standard involve the use of processes which could lead to a
hazardous situation.
7.1 Sequence of tests
7.1.1 The test shall be carried out in accordance with the procedures given in 7.1.1.1 to 7.1.1.5 in the
sequence as given.
7.1.1.1 First longitudinal loading
For a tractor with at least 50 % of its tractor mass on the rear wheels and for track-laying tractors, the
longitudinal loading shall be applied from the rear. For other tractors the longitudinal loading shall be
applied from the front.
7.1.1.2 First crushing test
The first crushing test shall be applied at the same end of the ROPS as the longitudinal loading.
7.1.1.3 Loading from the side
In the case of an offset seat and/or non-symmetrical strength of the ROPS, the side loading shall be on
the side most likely to lead to entering of the clearance zone.
10 © ISO 2013 – All rights reserved

7.1.1.4 Second crushing test
The second crushing test shall be applied at the opposite end of the ROPS to the longitudinal loading. In
the case of two-post designs, it may be at the same point as in 7.1.1.2.
7.1.1.5 Second longitudinal loading
A second longitudinal loading shall be applied to tractors fitted with a ROPS designed to be folded/tilted
when the longitudinal loading in 7.1.1.1 has not been applied in the direction in which the ROPS is
designed to fold/tilt. The second longitudinal loading does not apply to tiltable ROPS where the tilt
mechanism is independent from the structural integrity of the ROPS.
NOTE A folding ROPS (Example: two posts) is designed to be folded temporarily for special operating
conditions. A tiltable ROPS (Example: non-two posts) is designed to tilt for service.
7.1.2 All tests shall be performed on the same ROPS. No repairs or straightening of any member shall
be carried out between any parts of the tests.
7.1.3 On completion of all tests, permanent deflections of the ROPS shall be measured and recorded.
As loading continues, the cab/frame deformation may cause the direction of loading to change. This
is permissible.
7.2 Horizontal loading from rear, front and side
7.2.1 General requirements for horizontal loading tests
7.2.1.1 The loads applied to the ROPS shall be distributed by means of a stiff beam, complying with
the requirements of 5.1.2, located normal to the direction of load application; the stiff beam may have a
means of preventing its being displaced sideways. The rate of load application shall be such that the rate
of deflection does not exceed 5 mm/s. As the load is applied, F and D shall be recorded simultaneously as
continuous recordings to ensure accuracy. Once the initial application has commenced, the load shall not
be reduced until the test has been completed; but it is permissible to cease increasing the load if desired,
for example, to record measurements.
7.2.1.2 The direction of the applied force shall be within the following limits:
— at start of test (no load), ±2°;
— during test (under load), 10° above and 20° below the horizontal.
7.2.1.3 If no structural cross-member exists at the application point, a substitute test beam which does
not add strength to the structure may be used to complete the test procedure.
7.2.2 First longitudinal loading
7.2.2.1 The load shall be applied horizontally and parallel to the longitudinal median plane of the
tractor from the rear or the front as required by 7.1.1.1. If from the rear, it shall be applied to the opposite
side to that to which the side load is applied. If from the front, it shall be to the same side as the side load.
7.2.2.2 The load shall be applied to the uppermost transverse structural member of the ROPS (i.e. that
part which would be likely to strike the ground first in an overturning accident).
7.2.2.3 The load application point shall be at one-sixth of the width of the roll-over protective structure’s
top, inwards from the outside corner. The width of the ROPS shall be taken as the distance between two
lines parallel to the longitudinal median plane of the tractor and touching the outside extremities of the
ROPS in the horizontal plane touching the top of the uppermost transverse structural members.
7.2.2.4 In the event that the ROPS is formed of curved members and no appropriate corners exist, the
following general procedure shall apply for determining W. The test engineer shall identify the curved
member most likely to first strike ground in the event of an asymmetrical rear or front overturn (e.g.
an overturn to the front or rear where one side of the ROPS is likely to bear the initial loading). The
end points of W shall be the mid-points of the external radii created between other straight or curved
members which form the uppermost ROPS structure. In the event that multiple curved members could
be selected, the test engineer shall establish ground lines for each possible member to determine which
surface is most likely to strike ground first. See Figures 7 and 8 for examples.
NOTE In the event of curved members, only the width at the end of the structure to which the longitudinal
load is to be applied need be considered.
12 © ISO 2013 – All rights reserved

Key
1 seat index point (SIP)
2 seat reference plane, longitudinal median plane
3 point of second longitudinal load application, front or rear
4 point of longitudinal load application, rear or front
5 end point of W
Figure 7 — Example of ‘W’ for ROPS with curved members: 4-post ROPS
Key
1 seat index point (SIP)
2 seat reference plane, longitudinal median plane
3 point of second longitudinal load application, front or rear
4 point of longitudinal load application, rear or front
Figure 8 — Examples of ‘W’ for ROPS with curved members: 2-post ROPS
7.2.2.5 The beam length shall be not less than one-third of the roll-over protective structure’s width (as
described above) and not more than 49 mm over this minimum.
7.2.2.6 The test shall be stopped when
a) the strain energy absorbed by the ROPS is greater than or equal to the required input energy, E , in
il1
joules, where
Em=⋅14,
il1 t
or
b) the ROPS enters the clearance zone (see Clause 9) or leaves it unprotected.
7.2.3 Loading from side
7.2.3.1 The load shall be applied from the side horizontally normal to the longitudinal median plane.
It shall be applied to the roll-over protective structure’s upper extremity at a point (160 – a ) mm (see
h
Figures 3 and 4) forward of the SIP (see Figures 3 and 4, and Clause 8), or, for a tractor with reversible
driver’s position, midway between the SIPs measured in the two driving directions.
14 © ISO 2013 – All rights reserved

7.2.3.2 If it is certain that any particular part of the cab side will touch the ground first when the tractor
overturns sideways, the loading shall be applied at that point, provided that this permits uniform load
distribution as specified in 7.2.1. In the case of a two-post structure, side loading shall be applied at the
structural member uppermost on the side, regardless of the SIP.
7.2.3.3 The beam length shall be as long as practicable, subject to a maximum of 700 mm.
7.2.3.4 The test shall be stopped when
a) the strain energy absorbed by the ROPS is greater than or equal to the required input energy, E , in
is
joules, where
Em=⋅17, 5
is t
or
b) the ROPS enters the clearance zone (see Clause 9) or leaves it unprotected.
7.3 Crushing tests
7.3.1 Crushing at rear
7.3.1.1 The beam shall be positioned across the rear uppermost structural members (Figures 9 and 10)
and the resultant crushing forces shall be located in the vertical reference plane (3.10). The force, F , shall
r
be applied, where F = 20m , in newtons. This force shall be maintained for at least 5 s after the cessation
r t
of any visually detectable movement of the ROPS.
Key
1 position of beam for rear crushing test
2 seat index point
3 position of beam for front crushing test
Figure 9 — Position of beam for front and rear crushing tests on 4-post ROPS
Key
1 position of beam for rear crushing test
2 seat index point
3 position of beam for front crushing test
Figure 10 — Position of beam for front and rear crushing tests on 2-post ROPS
7.3.1.2 Where the rear part of the roll-over protective structure’s roof will not sustain the full crushing
force, the force shall be applied until the roof is deflected to coincide with the plane joining the upper
part of the ROPS to that part of the tractor rear capable of supporting the vehicle mass when overturned.
See Figures 11 and 12. The force shall then be removed and the tractor or loading force repositioned so
that the beam is over that point of the ROPS which would then support the tractor front when completely
overturned and the full force applied.
16 © ISO 2013 – All rights reserved

Key
1 imaginary ground plane
2 second position of the beam for front crushing test where the front part of the roof will not sustain the full
crushing force
3 part of the tractor capable of supporting the mass of the tractor when overturned
Figure 11 — Application of imaginary ground plane for front and rear crushing tests on 4-post
ROPS
Key
1 imaginary ground plane
Figure 12 — Application of imaginary ground plane for front and rear crushing tests on 2-post
ROPS
7.3.2 Crushing at front
7.3.2.1 The beam shall be positioned across the front uppermost structural members (Figures 9 and
10) and the resultant crushing forces shall be located in the vertical reference plane (3.10). The force,
F , shall be applied, where F = 20 m , in newtons. This force shall be maintained for at least 5 s after the
f f t
cessation of any visually detectable movement of the ROPS.
7.3.2.2 Where the front part of the roll-over protective structure’s roof will not sustain the full crushing
force, the force shall be applied until the roof is deflected to coincide with the plane joining the upper
part of the ROPS to that part of the tractor front capable of supporting the vehicle mass when overturned.
See Figures 11 and 12. The force shall then be removed and the tractor or loading force repositioned so
that the beam is over that part of the ROPS which would then support the tractor rear when completely
overturned and the full force applied.
7.4 Second longitudinal loading
7.4.1 The second longitudinal loading shall be applied in the opposite direction to, and at the corner
furthest from, the longitudinal loading according to 7.2.2, but otherwise in accordance with 7.2.1.
7.4.2 The test shall be stopped when
a) the strain energy absorbed by the protective structure is greater than or equal to the required input
energy, E , in joules, where
il2
Em=⋅03, 5
il2 t
or
b) the ROPS enters the clearance zone (see Clause 9) or leaves it unprotected.
8 Determination of seat index point (SIP), seat location and adjustment for test
8.1 Seat index point
The seat index point shall be determined in accordance with ISO 5353.
8.2 Seat location and adjustment for test
8.2.1 Where the seat position is adjustable, the seat must be adjusted to its rear uppermost position.
8.2.2 Where the inclination of the backrest is adjustable it must be adjusted to the mid position.
8.2.3 Where the seat is equipped with suspension, the latter must be blocked at mid-travel, unless this
is contrary to the instructions clearly laid down by the seat manufacturer.
8.2.4 Where the position of the seat is adjustable only lengthwise and vertically, the longitudinal axis
passing through the seat index point shall be parallel with the vertical longitudinal plane of the tractor
passing through the centre of the steering wheel and not more than 100 mm from that plane.
8.2.5 For a suspended seat, the manufacturer’s directions for setting the suspension shall be followed
if provided. Otherwise, the seat suspension shall be set to the suspension mid-travel point. After the
installation of the seat on the tractor, SIP becomes a fixed point with respect to the tractor and does not
move with the seat through its horizontal and vertical adjustment range.
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8.2.6 For extension tests for testing reports that originally used seat reference point (SRP), the required
measurements shall be made with reference to SRP instead of SIP and the use of SRP shall be clearly indicated.
9 Clearance zone
9.1 Determination of the clearance zone
The clearance zone is illustrated in Figures 5 and 13. The zone is defined in relation to the seat reference
plane and the SIP. The seat reference plane is primarily a vertical plane, generally longitudinal to
the tractor and passing through the SIP and the centre of the steering wheel. The SIP is determined
according to ISO 5353 and is a fixed point with respect to the tractor that does not move as the seat is
adjusted away from the mid-position. Normally, the seat reference plane coincides with the longitudinal
median plane of the tractor. This seat reference plane shall be assumed to move horizontally with the
seat and steering wheel during loading but remain perpendicular to the tractor or the floor of the roll-
over protective structure if the latter is resiliently mounted. The clearance zone shall be defined on the
basis of 9.2 and 9.3.
Dimensions in millimeters
a) Side view
b) Front or rear view
Key
1 seat index point
2 force
3 seat reference plane
Figure 13 — Clearance zone
9.2 Determination of the clearance zone for tractors with a non-reversible seat
The clearance zone for tractors with a non-reversible seat is defined and shall be bounded by the planes
listed in 9.2.1 to 9.2.10, the tractor being on a horizontal surface, the seat, where adjustable, adjusted
and located as specified in 8.2.1 and 8.2.2, and the steering wheel, where adjustable, adjusted to the
mid-position or seated driving.
9.2.1 A horizontal plane, A B B A , (810 + a ) mm above the seat index point (SIP) with line B B
1 1 2 2 v 1 2
located (a − 10) mm behind the SIP.
h
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9.2.2 An inclined plane, G G I I , perpendicular to the seat reference plane, including both a point
1 2 2 1
150 mm behind line B B and the rearmost point of the seat backrest.
1 2
9.2.3 A cylindrical surface, A A I I , perpendicular to the seat reference plane, having a radius of
1 2 2 1
120 mm, tangential to the planes defined in 9.2.1 and 9.2.2.
9.2.4 A cylindrical surface, B C C B , perpendicular to the seat reference plane, having a radius of
1 1 2 2
900 mm extending forward for 400 mm and tangential to the plane defined in 9.2.1 along line B B .
1 2
9.2.5 An inclined plane, C D D C , perpendicular to the seat reference plane, joining the surface defined
1 1 2 2
in 9.2.4 and passing 40 mm from the forward external edge of the steering wheel, or, in the case of a high
steering wheel position, extending forward from line B B tangentially to the surface defined in 9.2.4.
1 2
9.2.6 A vertical plane, D E E D , perpendicular to the seat reference plane 40 mm forward of the
1 1 2 2
external edge of the steering wheel.
9.2.7 A horizontal plane, E F F E , passing through a point (90 − a ) mm below
...