ISO/OECD 789-10:2006
(Main)Agricultural tractors — Test procedures — Part 10: Hydraulic power at tractor/implement interface
Agricultural tractors — Test procedures — Part 10: Hydraulic power at tractor/implement interface
ISO/OECD 789-10:2006 specifies tests for determining the hydraulic pressure at the external hydraulic service of an agricultural tractor/implement as specified in ISO 10448, as well as companion tests for measuring the maximum hydraulic power available.
Tracteurs agricoles — Modes opératoires d'essai — Partie 10: Puissance hydraulique disponible à la liaison tracteur/instrument
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Standards Content (Sample)
INTERNATIONAL ISO/OECD
STANDARD 789-10
First edition
2006-07-01
Agricultural tractors — Test
procedures —
Part 10:
Hydraulic power at tractor/implement
interface
Tracteurs agricoles — Modes opératoires d'essai —
Partie 10: Puissance hydraulique disponible à la liaison
tracteur/instrument
Reference number
ISO/OECD 789-10:2006(E)
©
ISO/OECD 2006
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ISO/OECD 789-10:2006(E)
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ii © ISO/OECD 2006 – All rights reserved
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ISO/OECD 789-10:2006(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Measurement units and tolerances. 3
5 General requirements. 3
5.1 Specification. 3
5.2 Running-in and preliminary adjustments. 3
6 Available hydraulic pressure test . 4
6.1 Steady state. 4
6.1.1 Test conditions . 4
6.1.2 Test procedures . 5
6.1.2.1 Flow through single coupler pair — Type 1 tests. 5
6.1.2.2 Flow through single coupler pair — Type 2 tests. 5
6.1.2.3 Flow into sump return port with coupler — Type 2 test. 5
6.1.2.4 Flow into sump return port without coupler — Type 2 test. 5
6.2 Peak pressure . 5
6.2.1 Test conditions . 5
6.2.2 Test procedure — Maximum flow selected — Type 2 test . 5
6.3 Test report — Available hydraulic pressure .6
6.3.1 Type 1 tests . 6
6.3.2 Type 2 tests . 6
7 Available hydraulic power . 7
7.1 Test conditions . 7
7.2 Test procedures . 7
7.2.1 Hydraulic power through single coupler pair — Types 1 and 2 tests . 7
7.2.2 Maximum available hydraulic power using two or more coupler pairs simultaneously —
Types 1 and 2 tests. 8
7.3 Test report — Available hydraulic power. 8
7.3.1 Maximum available hydraulic power — Type 1 tests. 8
7.3.2 Maximum useable (continuous) available hydraulic power — Type 2 tests . 8
Annex A (normative) Specimen test report . 10
Bibliography . 14
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ISO/OECD 789-10:2006(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
ISO/OECD 789-10 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture
and forestry, Subcommittee SC 2, Common tests, in cooperation with the Organisation for Economic
Cooperation and Development (OECD).
This first edition of ISO/OECD 789-10 cancels and replaces ISO 789-10:1996, 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 PTO — 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 10: Hydraulic power at tractor/implement interface [joint publication with OECD]
⎯ Part 11: Steering capability of wheeled tractors
⎯ Part 12: Low temperature starting
Rear three-point linkage lifting capacity is to form the subject of a future ISO/OECD 789-2.
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ISO/OECD 789-10:2006(E)
Foreword
OECD (the Organisation for Economic Cooperation and Development) is an intergovernmental reference
for the certification and standardization of certain agricultural commodities. The work of the OECD in the area
of standardization involves both member and non-member economies and focuses on the creation of common
criteria in order to facilitate international trade. Participating countries are members of the OECD, the United
Nations or the World Trade Organization.
The OECD Tractor Codes provide common performance criteria overseen by the OECD Committee for
Agriculture. The Committee is one of the major OECD policy committees and is responsible for implementing
the agricultural programme of work. The Codes and their amendments are subject to approval by the OECD
Council. They relate to the following tests:
⎯ tractor performance (Code 2);
⎯ strength of protective structures for standard tractors (dynamic test) (Code 3);
⎯ strength of protective structures for standard tractors (static test) (Code 4);
⎯ noise measurement at the driver’s position(s) (Code 5);
⎯ strength of front-mounted roll-over protective structures on narrow-track wheeled agricultural and forestry
tractors (Code 6);
⎯ strength of rear-mounted roll-over protective structures on narrow-track wheeled agricultural and forestry
tractors (Code 7);
⎯ strength of protective structures on track-laying tractors (Code 8);
⎯ strength of protective structures on telehandlers (Code 9).
The OECD Tractor Codes are made available to those countries which are OECD Members, as well as to
other countries. To date, 29 countries adhere to the Codes, including three non-OECD Members, China, India
and the Russian Federation. Each National Authority designated for implementing the Codes may perform
tractor tests according to the common harmonized testing procedures and then submit results to OECD for
approval.
Cooperative agreements are established between OECD and certain institutions, such as ISO and the
European Community, with the objective of avoiding contradictory requirements. The European Commission
participates in the work of the OECD and is represented on the OECD Council (without the right of veto).
A Memorandum of Understanding (MoU) has been signed by ISO and OECD in connection with the
TC 23/SC 2 programme of work on tractors.
The OECD test codes are published in French (F) and English (E), and are subject to periodic revision for
dealing with the technical progress of agricultural and forestry tractors.
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INTERNATIONAL STANDARD ISO/OECD 789-10:2006(E)
Agricultural tractors — Test procedures —
Part 10:
Hydraulic power at tractor/implement interface
1 Scope
ISO/OECD 789-10 specifies tests for determining the hydraulic pressure at the external hydraulic service of an
agricultural tractor/implement as specified in ISO 10448, as well as companion tests for measuring the
maximum hydraulic power available.
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 730-1:1994, Agricultural wheeled tractors — Rear-mounted three-point linkage — Part 1: Categories 1, 2, 3
and 4
ISO 3448:1992, Industrial liquid lubricants — ISO viscosity classification
ISO 5675:1992, Agricultural tractors and machinery — General purpose quick-action hydraulic couplers
ISO 6149-1:2006, Connections for hydraulic fluid power and general use — Ports and stud ends with ISO 261
metric threads and O-ring sealing — Part 1: Ports with truncated housing for O-ring seal
ISO 6149-2:2006, Connections for hydraulic fluid power and general use — Ports and stud ends with ISO 261
metric threads and O-ring sealing — Part 2: Dimensions, design, test methods and requirements for heavy-
duty (S series) stud ends
ISO 6149-3:2006, Connections for hydraulic fluid power and general use — Ports and stud ends with ISO 261
metric threads and O-ring sealing — Part 3: Dimensions, design, test methods and requirements for light-duty
(L series) stud ends
ISO 10448:1994, Agricultural tractors — Hydraulic pressure for implements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
agricultural tractor
self-propelled machine, either wheeled and having at least two axles or track-laying, particularly designed to
pull, push, carry and operate implements used for agricultural work (including forestry work)
NOTE It may be provided with a detachable loading platform.
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ISO/OECD 789-10:2006(E)
3.2
maximum engine speed
engine speed at which the throttle control is at the maximum setting
3.3
rated engine speed
engine speed specified by the tractor manufacturer for continuous operation at full load
3.4
external hydraulic service
source of hydraulic power, derived from the hydraulic system of the agricultural tractor, available for use on an
implement mounted on, coupled to or otherwise used in conjunction with it
[ISO 10448:1994]
3.5
coupler pair
pair of female hydraulic couplers compatible with male couplers as specified in ISO 5675, mounted on
agricultural tractors and connected to the hydraulic system to allow flow from one coupler to the other
[ISO 10448:1994]
3.6
available differential pressure
steady state difference of the hydraulic pressure between two male coupler parts on the implement side
[ISO 10448:1994]
3.7
maximum pressure
maximum steady state hydraulic pressure at either male coupler connected to a coupler pair
[ISO 10448:1994]
3.8
maximum loop return pressure
maximum steady hydraulic pressure at the male coupler returning flow to a hydraulic system that can reverse
the flow through that coupler
[ISO 10448:1994]
3.9
maximum sump return pressure with coupler
maximum steady state hydraulic pressure at the male coupler returning flow directly to the reservoir
[ISO 10448:1994]
3.10
maximum sump return pressure without coupler
maximum steady state hydraulic pressure at an M22 × 1,5 or M27 × 2 thread size port in accordance with
ISO 6149-1, ISO 6149-2 or ISO 6149-3, returning flow directly to the reservoir
[ISO 10448:1994]
3.11
rated maximum hydraulic pressure
maximum pressure as specified by the tractor manufacturer for continuous use
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ISO/OECD 789-10:2006(E)
3.12
maximum hydraulic power
hydraulic power calculation based on the measured flow and available coupler outlet pressure (the pressure
near the coupler where oil is exiting from the tractor)
NOTE The calculation does not take into account return pressure losses.
3.13
maximum useable (continuous) hydraulic power
hydraulic power calculation based on the measured flow and available differential pressure (the pressure near
the coupler where oil is exiting from the tractor minus the pressure near the coupler where oil is re-entering
the tractor)
NOTE The calculation takes into account the return pressure losses and defines the useable hydraulic power
available.
3.14
peak pressure
maximum instantaneous hydraulic pressure at either male coupler connected to a coupler pair
[ISO 10448:1994]
4 Measurement units and tolerances
The following units and tolerances apply to the maximum value measured:
a) rotational frequency, in revolutions per minute (r/min): ± 0,5 %;
b) time, in seconds (s): ± 0,2 s;
c) temperature, in degrees Celsius: ± 2 °C (applicable to actual readings);
d) pressure, in megapascals (MPa): ± 2 %;
e) flow, in litres per minute (l/min): ± 2 %.
5 General requirements
5.1 Specification
The tractor tested shall have its identification specification given in the test report (see Annex A) and shall be
used in accordance with the manufacturer’s recommendations for normal operation.
5.2 Running-in and preliminary adjustments
5.2.1 The tractor shall be run-in prior to the test.
5.2.2 The hydraulic fluid shall be as recommended by the manufacturer and identified by type and viscosity
in accordance with ISO 3448.
5.2.3 For the Type 1 tests listed in Annex A (OECD Code 2 compulsory tests), the throttle or governor
control lever shall be adjusted to the maximum engine speed. The engine speed is continuously recorded
during the tests.
5.2.4 For the Type 2 tests listed in Annex A (OECD Code 2 supplementary tests), the engine speed
condition may be either rated or maximum engine speed and is at the discretion of the manufacturer. For tests
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