Agricultural tractors -- Test procedures

ISO 789-3:2015 specifies a method of determining the turning and clearance diameters of wheeled agricultural tractors. It applies to wheeled agricultural tractors having at least two axles fitted with pneumatic tyres.

Tracteurs agricoles -- Méthodes d'essai

Kmetijski traktorji - Preskusne metode - 3. del: Premer obračalnega kroga in kroga, ki ga opiše skrajna zunanja točka traktorja

Ta del standarda ISO 789 določa metodo za ugotavljanje premera obračalnega kroga in kroga, ki ga opiše skrajna zunanja točka
kmetijskega traktorja s kolesi. Uporablja se za kolesne traktorje, ki se uporabljajo v kmetijstvu, z najmanj dvema osema za kolesa s pnevmatikami.

General Information

Status
Published
Publication Date
24-Aug-2015
Current Stage
6060 - International Standard published
Start Date
16-Apr-2015
Completion Date
25-Aug-2015

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INTERNATIONAL ISO
STANDARD 789-3
Third edition
2015-09-01
Agricultural tractors — Test
procedures —
Part 3:
Turning and clearance diameters
Tracteurs agricoles — Méthodes d’essai —
Partie 3: Diamètres de braquage et de dégagement
Reference number
ISO 789-3:2015(E)
ISO 2015
---------------------- Page: 1 ----------------------
ISO 789-3:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 789-3:2015(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Terms and definitions ..................................................................................................................................................................................... 1

3 Apparatus ..................................................................................................................................................................................................................... 5

4 General requirements ..................................................................................................................................................................................... 5

4.1 Test area ........................................................................................................................................................................................................ 5

4.2 Tractor test requirements ............................................................................................................................................................. 5

4.2.1 Tire and wheel equipment ...................................................................................................................................... 5

4.2.2 Track (tread) setting ..................................................................................................................................................... 5

4.2.3 Other settings ..................................................................................................................................................................... 5

5 Procedure..................................................................................................................................................................................................................... 6

5.1 Right-hand turn, without brakes ............................................................................................................................................. 6

5.1.1 Direct measurement ..................................................................................................................................................... 6

5.1.2 Alternate GPS method ................................................................................................................................................. 6

5.2 Left-hand turn, without brakes ................................................................................................................................................. 6

5.3 Right-hand turn, with brakes ..................................................................................................................................................... 7

5.4 Left-hand turn, with brakes ......................................................................................................................................................... 7

6 Test report ................................................................................................................................................................................................................10

Annex A (informative) Specimen test report ............................................................................................................................................11

© ISO 2015 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 789-3:2015(E)
Foreword

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

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

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

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

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

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

electrotechnical standardization.

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

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

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

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical

Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/TC 23, Tractors and machinery for agriculture and

forestry, Subcommittee 2, Common tests.

This third edition cancels and replaces the second edition (ISO 789-3:1993), which has been

technically revised.

ISO 789 consists of the following parts, under the general title Agricultural tractors — Test procedures:

— Part 1: Power tests for power take-off
— Part 2: Rear three-point linkage lifting capacity
— Part 3: Turning and clearance diameters
— Part 4: Measurement of exhaust smoke
— Part 5: Partial power PT0 – Non-mechanically transmitted power
— Part 6: Centre of gravity
— Part 7: Axle power determination
— Part 8: Engine air cleaner
— Part 9: Power tests for drawbar
— Part 11: Steering capability of wheeled tractors
— Part 12: Low temperature starting

ISO/OECD 789 consists of the following parts, under the general title Agricultural tractors – Test procedures:

— Part 10: Hydraulic power at tractor/implement interface
iv © ISO 2015 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 789-3:2015(E)
Agricultural tractors — Test procedures —
Part 3:
Turning and clearance diameters
1 Scope

This part of ISO 789 specifies a method of determining the turning and clearance diameters of wheeled

agricultural tractors.

It applies to wheeled agricultural tractors having at least two axles fitted with pneumatic tyres.

2 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
2.1
agricultural tractor

self-propelled agricultural vehicle having at least two axles and wheels, or endless tracks, particularly

designed to pull agricultural trailers and to pull, push, carry and operate implements used for

agricultural work (including forestry work), which may be provided with detachable loading platform

Note 1 to entry: The agricultural vehicle has a maximum design speed of not less than 6 km/h and may be

equipped with one or more seats.
[SOURCE: ISO 12934:2013, 3.1]
2.2
track
tread

distance at ground level between two vertical planes passing through the centreline

of ground contact of the tires parallel to the median plane of the tractor with the wheels in the straight

ahead position

Note 1 to entry: In the case of dual wheels, it is the distance at ground level between two planes passing through

the centreline of the dual wheels.
Note 2 to entry: See Figure 1.
© ISO 2015 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 789-3:2015(E)
Figure 1 — Track (tread) of the wheeled tractor
2.3
wheelbase

horizontal distance between the two vertical planes passing through the rotational centrelines of the

wheels, where one plane is for the front wheels and the other for the rear wheels

Note 1 to entry: In the case of a tractor equipped with a rear tandem, it is the distance between two vertical

planes passing through the centres of the front wheel and the vertical plane midway between the wheel centres

of the two axles of the tandem.
Note 2 to entry: See Figure 2.
2 © ISO 2015 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 789-3:2015(E)
Figure 2 — Wheelbase of the wheeled tractor
2.4
turning diameter

diameter of the circular path described by the centre of tire contact with the surface of the test site of

the wheel describing the largest circle when the tractor is executing its sharpest practicable turn under

the test conditions described in Clause 5
Note 1 to entry: See Figure 3.
2.5
clearance diameter

diameter of the smallest circle which will enclose the outermost points of projection of the tractor and

its equipment while executing its sharpest practicable turn
Note 1 to entry: See Figure 3.
© ISO 2015 – All rights reserved 3
---------------------- Page: 7 ----------------------
ISO 789-3:2015(E)
Figure 3 — Tractor turning configurations
4 © ISO 2015 – All rights reserved
---------------------- Page: 8 ----------------------
ISO 789-3:2015(E)
3 Apparatus
3.1 Tape measure, of length greater than the turning and clearan
...

SLOVENSKI STANDARD
SIST ISO 789-3:2016
01-maj-2016
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SIST ISO 789-3:1997

.PHWLMVNLWUDNWRUML3UHVNXVQHPHWRGHGHO3UHPHUREUDþDOQHJDNURJDLQNURJD

NLJDRSLãHVNUDMQD]XQDQMDWRþNDWUDNWRUMD

Agricultural tractors - Test procedures - Part 3: Turning and clearance diameters

Tracteurs agricoles - Méthodes d'essai - Partie 3: Diamètres de braquage et de
dégagement
Ta slovenski standard je istoveten z: ISO 789-3:2015
ICS:
65.060.10 Kmetijski traktorji in prikolice Agricultural tractors and
trailed vehicles
SIST ISO 789-3:2016 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST ISO 789-3:2016
---------------------- Page: 2 ----------------------
SIST ISO 789-3:2016
INTERNATIONAL ISO
STANDARD 789-3
Third edition
2015-09-01
Agricultural tractors — Test
procedures —
Part 3:
Turning and clearance diameters
Tracteurs agricoles — Méthodes d’essai —
Partie 3: Diamètres de braquage et de dégagement
Reference number
ISO 789-3:2015(E)
ISO 2015
---------------------- Page: 3 ----------------------
SIST ISO 789-3:2016
ISO 789-3:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 789-3:2016
ISO 789-3:2015(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Terms and definitions ..................................................................................................................................................................................... 1

3 Apparatus ..................................................................................................................................................................................................................... 5

4 General requirements ..................................................................................................................................................................................... 5

4.1 Test area ........................................................................................................................................................................................................ 5

4.2 Tractor test requirements ............................................................................................................................................................. 5

4.2.1 Tire and wheel equipment ...................................................................................................................................... 5

4.2.2 Track (tread) setting ..................................................................................................................................................... 5

4.2.3 Other settings ..................................................................................................................................................................... 5

5 Procedure..................................................................................................................................................................................................................... 6

5.1 Right-hand turn, without brakes ............................................................................................................................................. 6

5.1.1 Direct measurement ..................................................................................................................................................... 6

5.1.2 Alternate GPS method ................................................................................................................................................. 6

5.2 Left-hand turn, without brakes ................................................................................................................................................. 6

5.3 Right-hand turn, with brakes ..................................................................................................................................................... 7

5.4 Left-hand turn, with brakes ......................................................................................................................................................... 7

6 Test report ................................................................................................................................................................................................................10

Annex A (informative) Specimen test report ............................................................................................................................................11

© ISO 2015 – All rights reserved iii
---------------------- Page: 5 ----------------------
SIST ISO 789-3:2016
ISO 789-3:2015(E)
Foreword

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

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

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

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

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

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

electrotechnical standardization.

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

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

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

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical

Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/TC 23, Tractors and machinery for agriculture and

forestry, Subcommittee 2, Common tests.

This third edition cancels and replaces the second edition (ISO 789-3:1993), which has been

technically revised.

ISO 789 consists of the following parts, under the general title Agricultural tractors — Test procedures:

— Part 1: Power tests for power take-off
— Part 2: Rear three-point linkage lifting capacity
— Part 3: Turning and clearance diameters
— Part 4: Measurement of exhaust smoke
— Part 5: Partial power PT0 – Non-mechanically transmitted power
— Part 6: Centre of gravity
— Part 7: Axle power determination
— Part 8: Engine air cleaner
— Part 9: Power tests for drawbar
— Part 11: Steering capability of wheeled tractors
— Part 12: Low temperature starting

ISO/OECD 789 consists of the following parts, under the general title Agricultural tractors – Test procedures:

— Part 10: Hydraulic power at tractor/implement interface
iv © ISO 2015 – All rights reserved
---------------------- Page: 6 ----------------------
SIST ISO 789-3:2016
INTERNATIONAL STANDARD ISO 789-3:2015(E)
Agricultural tractors — Test procedures —
Part 3:
Turning and clearance diameters
1 Scope

This part of ISO 789 specifies a method of determining the turning and clearance diameters of wheeled

agricultural tractors.

It applies to wheeled agricultural tractors having at least two axles fitted with pneumatic tyres.

2 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
2.1
agricultural tractor

self-propelled agricultural vehicle having at least two axles and wheels, or endless tracks, particularly

designed to pull agricultural trailers and to pull, push, carry and operate implements used for

agricultural work (including forestry work), which may be provided with detachable loading platform

Note 1 to entry: The agricultural vehicle has a maximum design speed of not less than 6 km/h and may be

equipped with one or more seats.
[SOURCE: ISO 12934:2013, 3.1]
2.2
track
tread

distance at ground level between two vertical planes passing through the centreline

of ground contact of the tires parallel to the median plane of the tractor with the wheels in the straight

ahead position

Note 1 to entry: In the case of dual wheels, it is the distance at ground level between two planes passing through

the centreline of the dual wheels.
Note 2 to entry: See Figure 1.
© ISO 2015 – All rights reserved 1
---------------------- Page: 7 ----------------------
SIST ISO 789-3:2016
ISO 789-3:2015(E)
Figure 1 — Track (tread) of the wheeled tractor
2.3
wheelbase

horizontal distance between the two vertical planes passing through the rotational centrelines of the

wheels, where one plane is for the front wheels and the other for the rear wheels

Note 1 to entry: In the case of a tractor equipped with a rear tandem, it is the distance between two vertical

planes passing through the centres of the front wheel and the vertical plane midway between the wheel centres

of the two axles of the tandem.
Note 2 to entry: See Figure 2.
2 © ISO 2015 – All rights reserved
---------------------- Page: 8 ----------------------
SIST ISO 789-3:2016
ISO 789-3:2015(E)
Figure 2 — Wheelbase of the wheeled tractor
2.4
turning diameter

diameter of the circular path described by the centre of tire contact with the surface of the test site of

the wheel describing the largest circle when the tractor is executing its sharpest practicable turn under

the test conditions described in Clause 5
Note 1 to entry: See Figure 3.
2.5
clearance diameter

diameter of the smallest circle which will enclose the outermost points of projection of the

...

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