Agricultural tractors -- Test procedures

ISO 789-1:2018 specifies test procedures for determining the power available at the power take-off (PTO) on agricultural tractors of the wheeled, track-laying or semi-track-laying type.

Tracteurs agricoles -- Méthodes d'essai

Kmetijski traktorji - Postopki preskušanja - 1. del: Preskušanje moči na priključni gredi

General Information

Status
Published
Publication Date
21-Feb-2018
Technical Committee
Current Stage
6060 - International Standard published
Start Date
27-Dec-2017
Completion Date
22-Feb-2018

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SLOVENSKI STANDARD
SIST ISO 789-1:2020
01-november-2020

Kmetijski traktorji - Postopki preskušanja - 1. del: Preskušanje moči na priključni

gredi
Agricultural tractors - Test procedures - Part 1: Power tests for power take-off
Ta slovenski standard je istoveten z: ISO 789-1:2018
ICS:
65.060.10 Kmetijski traktorji in prikolice Agricultural tractors and
trailed vehicles
SIST ISO 789-1:2020 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST ISO 789-1:2020
---------------------- Page: 2 ----------------------
SIST ISO 789-1:2020
INTERNATIONAL ISO
STANDARD 789-1
Third edition
2018-02
Agricultural tractors — Test
procedures —
Part 1:
Power tests for power take-off
Tracteurs agricoles — Méthodes d'essai —
Partie 1: Essais de puissance à la prise de force
Reference number
ISO 789-1:2018(E)
ISO 2018
---------------------- Page: 3 ----------------------
SIST ISO 789-1:2020
ISO 789-1:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 789-1:2020
ISO 789-1:2018(E)
Contents Page

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

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

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Measurement units and tolerances ................................................................................................................................................... 1

5 General requirements ..................................................................................................................................................................................... 2

5.1 Selection........................................................................................................................................................................................................ 2

5.2 Running-in and preliminary adjustments ....................................................................................................................... 2

5.3 Manufacturer's instructions ........................................................................................................................................................ 2

5.4 Repairs ........................................................................................................................................................................................................... 2

5.5 Preliminary information ................................................................................................................................................................. 2

5.6 Fuels and lubricants ........................................................................................................................................................................... 3

5.6.1 Selection .................................................................................................................................................................................. 3

5.6.2 Measuring consumption .................. ......................................................................................................................... . 3

5.6.3 Tractors equipped with diesel particulate filters ................................................................................ 3

5.7 Auxiliary equipment ........................................................................................................................................................................... 3

5.8 Ambient conditions ............................................................................................................................................................................. 3

5.9 Test equipment ....................................................................................................................................................................................... 3

5.10 Alternative PTO ratio ......................................................................................................................................................................... 4

5.11 Testing rules .............................................................................................................................................................................................. 4

5.12 Required measurements ................................................................................................................................................................ 4

5.13 Warm-up....................................................................................................................................................................................................... 4

6 Test procedure ........................................................................................................................................................................................................ 4

6.1 Varying engine speed at full load ............................................................................................................................................ 4

6.2 Maximum power.................................................................................................................................................................................... 5

6.2.1 Rated engine speed ........................................................................................................................................................ 5

6.2.2 Standard PTO speed ...................................................................................................................................................... 5

6.2.3 Absolute maximum power ...................................................................................................................................... 5

6.3 Variable loads ........................................................................................................................................................................................... 5

6.3.1 Rated engine speed ........................................................................................................................................................ 5

6.3.2 Standard PTO speed ...................................................................................................................................................... 5

6.4 Variable loads and varying engine speed ......................................................................................................................... 6

6.4.1 Five additional points for calculating fuel consumption characteristics......................... 6

6.4.2 Tractors with regenerating particulate filters ........................................................................................ 6

6.5 Statement of power rating ............................................................................................................................................................ 7

7 Test report ................................................................................................................................................................................................................... 7

Bibliography ................................................................................................................................................................................................................................ 9

© ISO 2018 – All rights reserved iii
---------------------- Page: 5 ----------------------
SIST ISO 789-1:2020
ISO 789-1:2018(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 voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www .iso .org/ iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture

and forestry, Subcommittee SC 2, Common tests.

This third edition cancels and replaces the second edition (ISO 789-1:1990), which has been technically

revised for the technical harmonization with OECD Code 2: February 2017.
A list of all the parts in the ISO 789 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved
---------------------- Page: 6 ----------------------
SIST ISO 789-1:2020
INTERNATIONAL STANDARD ISO 789-1:2018(E)
Agricultural tractors — Test procedures —
Part 1:
Power tests for power take-off
1 Scope

This document specifies test procedures for determining the power available at the power take-off

(PTO) on agricultural tractors of the wheeled, track-laying or semi-track-laying type.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 500-1, Agricultural tractors — Rear-mounted power take-off types 1, 2, 3 and 4 — Part 1: General

specifications, safety requirements, dimensions for master shield and clearance zone

ISO 500-2, Agricultural tractors — Rear-mounted power take-off types 1, 2 and 3 — Part 2: Narrow-track

tractors, dimensions for master shield and clearance zone

ISO 500-3, Agricultural tractors — Rear-mounted power take-off types 1, 2, 3 and 4 — Part 3: Main PTO

dimensions and spline dimensions, location of PTO

ISO 789-13:2018, Agricultural tractors — Test procedures — Part 13: Vocabulary and specimen test report

ISO 8759-1, Agricultural wheeled tractors — Front-mounted equipment — Part 1: Power take-off and

three-point linkage
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 789-13 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Measurement units and tolerances
The following units and tolerances apply to the maximum value measured:
— rotational frequency, in revolutions per minute (r/min): ± 0,5 %;
— time, in seconds (s): ± 0,2 s;
— distance, in metres or millimetres (m or mm): ± 0,5 %;
— force, in newtons (N): ± 1 %;
— torque, in newton metres (N·m): ± 1 %;
© ISO 2018 – All rights reserved 1
---------------------- Page: 7 ----------------------
SIST ISO 789-1:2020
ISO 789-1:2018(E)
— mass, in kilograms (kg): ± 0,5 %;
— fuel consumption, in kilograms per kilowatt hour (kg/kWh): ± 1 %;
— atmospheric pressure, in kilopascals (kPa): ± 0,2 kPa;
— temperature of fuels, etc., in degrees Celsius: ± 2 °C;
— wet and dry bulb thermometer temperature, in degrees Celsius: ± 0,5 °C.
5 General requirements
5.1 Selection

In the case of a third party performing the assessment, the tractor manufacturer and the third party

shall work together to select a tractor to be submitted for testing. The tractor submitted for the test

shall require a serial number, shall comply with the manufacturer’s product specification, and shall

be operated in accordance with the manufacturer’s instructions. The manufacturer shall provide a

representative to be present throughout the entire testing of the tractor.
5.2 Running-in and preliminary adjustments

5.2.1 The tractor shall be new and run-in prior to the test in accordance with the manufacturer’s

usual instructions. If a third party is responsible for the testing, the third party itself may run-in the

tractor provided an authority of the manufacturer or the manufacturer’s representative, who will remain

responsible for the running-in, is obtained.
The test report shall state the place and duration of running in.
5.2.2 The adjustment of the carburettor or inj
...

INTERNATIONAL ISO
STANDARD 789-1
Third edition
2018-02
Agricultural tractors — Test
procedures —
Part 1:
Power tests for power take-off
Tracteurs agricoles — Méthodes d'essai —
Partie 1: Essais de puissance à la prise de force
Reference number
ISO 789-1:2018(E)
ISO 2018
---------------------- Page: 1 ----------------------
ISO 789-1:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 789-1:2018(E)
Contents Page

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

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

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Measurement units and tolerances ................................................................................................................................................... 1

5 General requirements ..................................................................................................................................................................................... 2

5.1 Selection........................................................................................................................................................................................................ 2

5.2 Running-in and preliminary adjustments ....................................................................................................................... 2

5.3 Manufacturer's instructions ........................................................................................................................................................ 2

5.4 Repairs ........................................................................................................................................................................................................... 2

5.5 Preliminary information ................................................................................................................................................................. 2

5.6 Fuels and lubricants ........................................................................................................................................................................... 3

5.6.1 Selection .................................................................................................................................................................................. 3

5.6.2 Measuring consumption .................. ......................................................................................................................... . 3

5.6.3 Tractors equipped with diesel particulate filters ................................................................................ 3

5.7 Auxiliary equipment ........................................................................................................................................................................... 3

5.8 Ambient conditions ............................................................................................................................................................................. 3

5.9 Test equipment ....................................................................................................................................................................................... 3

5.10 Alternative PTO ratio ......................................................................................................................................................................... 4

5.11 Testing rules .............................................................................................................................................................................................. 4

5.12 Required measurements ................................................................................................................................................................ 4

5.13 Warm-up....................................................................................................................................................................................................... 4

6 Test procedure ........................................................................................................................................................................................................ 4

6.1 Varying engine speed at full load ............................................................................................................................................ 4

6.2 Maximum power.................................................................................................................................................................................... 5

6.2.1 Rated engine speed ........................................................................................................................................................ 5

6.2.2 Standard PTO speed ...................................................................................................................................................... 5

6.2.3 Absolute maximum power ...................................................................................................................................... 5

6.3 Variable loads ........................................................................................................................................................................................... 5

6.3.1 Rated engine speed ........................................................................................................................................................ 5

6.3.2 Standard PTO speed ...................................................................................................................................................... 5

6.4 Variable loads and varying engine speed ......................................................................................................................... 6

6.4.1 Five additional points for calculating fuel consumption characteristics......................... 6

6.4.2 Tractors with regenerating particulate filters ........................................................................................ 6

6.5 Statement of power rating ............................................................................................................................................................ 7

7 Test report ................................................................................................................................................................................................................... 7

Bibliography ................................................................................................................................................................................................................................ 9

© ISO 2018 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 789-1:2018(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 voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www .iso .org/ iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture

and forestry, Subcommittee SC 2, Common tests.

This third edition cancels and replaces the second edition (ISO 789-1:1990), which has been technically

revised for the technical harmonization with OECD Code 2: February 2017.
A list of all the parts in the ISO 789 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 789-1:2018(E)
Agricultural tractors — Test procedures —
Part 1:
Power tests for power take-off
1 Scope

This document specifies test procedures for determining the power available at the power take-off

(PTO) on agricultural tractors of the wheeled, track-laying or semi-track-laying type.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 500-1, Agricultural tractors — Rear-mounted power take-off types 1, 2, 3 and 4 — Part 1: General

specifications, safety requirements, dimensions for master shield and clearance zone

ISO 500-2, Agricultural tractors — Rear-mounted power take-off types 1, 2 and 3 — Part 2: Narrow-track

tractors, dimensions for master shield and clearance zone

ISO 500-3, Agricultural tractors — Rear-mounted power take-off types 1, 2, 3 and 4 — Part 3: Main PTO

dimensions and spline dimensions, location of PTO

ISO 789-13:2018, Agricultural tractors — Test procedures — Part 13: Vocabulary and specimen test report

ISO 8759-1, Agricultural wheeled tractors — Front-mounted equipment — Part 1: Power take-off and

three-point linkage
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 789-13 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Measurement units and tolerances
The following units and tolerances apply to the maximum value measured:
— rotational frequency, in revolutions per minute (r/min): ± 0,5 %;
— time, in seconds (s): ± 0,2 s;
— distance, in metres or millimetres (m or mm): ± 0,5 %;
— force, in newtons (N): ± 1 %;
— torque, in newton metres (N·m): ± 1 %;
© ISO 2018 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 789-1:2018(E)
— mass, in kilograms (kg): ± 0,5 %;
— fuel consumption, in kilograms per kilowatt hour (kg/kWh): ± 1 %;
— atmospheric pressure, in kilopascals (kPa): ± 0,2 kPa;
— temperature of fuels, etc., in degrees Celsius: ± 2 °C;
— wet and dry bulb thermometer temperature, in degrees Celsius: ± 0,5 °C.
5 General requirements
5.1 Selection

In the case of a third party performing the assessment, the tractor manufacturer and the third party

shall work together to select a tractor to be submitted for testing. The tractor submitted for the test

shall require a serial number, shall comply with the manufacturer’s product specification, and shall

be operated in accordance with the manufacturer’s instructions. The manufacturer shall provide a

representative to be present throughout the entire testing of the tractor.
5.2 Running-in and preliminary adjustments

5.2.1 The tractor shall be new and run-in prior to the test in accordance with the manufacturer’s

usual instructions. If a third party is responsible for the testing, the third party itself may run-in the

tractor provided an authority of the manufacturer or the manufacturer’s representative, who will remain

responsible for the running-in, is obtained.
The test report shall state the place and duration of running in.

5.2.2 The adjustment of the carburettor or injection pump as well as the setting of the governor shall

conform to the specifications provided by the manufacturer. The manufacturer may make adjustments in

conformity with these specifications prior to testing, but adjustments shall not be made during the test.

5.3 Manufacturer's instructions

Once the test has started, the tractor shall never be operated in a way that is not in ac

...

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