Tractors for agriculture and forestry -- Roll-over protective structures -- Static test method and acceptance conditions

ISO 5700:2013 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.

Tracteurs agricoles et forestiers -- Structures de protection contre le retournement -- Méthode d'essai statique et conditions d'acceptation

General Information

Status
Published
Publication Date
05-May-2013
Technical Committee
Current Stage
6060 - International Standard published
Start Date
25-Mar-2013
Completion Date
06-May-2013
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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 5700:2013(E)
ISO 2013
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ISO 5700:2013(E)
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© ISO 2013

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Published in Switzerland
ii © ISO 2013 – All rights reserved
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ISO 5700:2013(E)
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

© ISO 2013 – All rights reserved iii
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ISO 5700:2013(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2. 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
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ISO 5700:2013(E)
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.
© ISO 2013 – All rights reserved v
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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.
© ISO 2013 – All rights reserved 1
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ISO 5700:2013(E)
3.3
reference mass

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
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ISO 5700:2013(E)
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
© ISO 2013 – All rights reserved 3
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ISO 5700:2013(E)
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
a Half of the vertical seat adjustment mm

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
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 Applied force at rear in the crushing test N
m Reference mass kg
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
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ISO 5700:2013(E)
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
© ISO 2013 – All rights reserved 5
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ISO 5700:2013(E)
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
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ISO 5700:2013(E)

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
1 A
C I
2 2
1 H
J G
2 2
2 1
Key
1 seat index point
Figure 5 — Clearance zone measuring rig
© ISO 2013 – All rights reserved 7
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ISO 5700:2013(E)
Table 2 — Dimensions for the Clearance zone measuring rig shown in Figure 5
Dimensions Remarks
AA 
100 Minimum
AA 
BB 500
12 
Minimum or equal to the
DD  
steering-wheel radius plus 40 mm,
500 
 
12 
whhichever is greater
FF 
12 
HH 500
12 
Minimum or equal to the
EE 
10
steering-wheel radius plus 40 mm,
250
 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
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ISO 5700:2013(E)
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.
© ISO 2013 – All rights reserved 9
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ISO 5700:2013(E)

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.
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ISO 5700:2013(E)
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. I

...

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