ISO 789-13:2018

Agricultural tractors — Test procedures — Part 13: Vocabulary and specimen test report

ISO 789-13:2018 gives terms and definitions for use in the other parts of ISO 789. Annex A provides a specimen test report for all parts of ISO 789.

Tracteurs agricoles — Méthodes d'essai — Partie 13: Vocabulaire et modèle de rapport d'essai

General Information

• Status: Published
• Publication Date: 21-Feb-2018
• ICS: 65.060.10 - Agricultural tractors and trailed vehicles
• Technical Committee: ISO/TC 23/SC 2 - Common tests
• Drafting Committee: ISO/TC 23/SC 2 - Common tests
• Current Stage: 9060 - Close of review
• Start Date: 02-Sep-2028

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 789-13
First edition
2018-02
Agricultural tractors — Test
procedures —
Part 13:
Vocabulary and specimen test report
Tracteurs agricoles — Méthodes d'essai —
Partie 13: Vocabulaire et modèle de rapport d'essai
Reference number
ISO 789-13:2018(E)
©
ISO 2018

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ISO 789-13:2018(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2018
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ii © ISO 2018 – All rights reserved

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ISO 789-13:2018(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
Annex A (informative) Specimen ISO 789 test report . 9
Bibliography .43
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ISO 789-13:2018(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
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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).
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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.
A list of all the parts in the ISO 789 series can be found on the ISO website.
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INTERNATIONAL STANDARD ISO 789-13:2018(E)
Agricultural tractors — Test procedures —
Part 13:
Vocabulary and specimen test report
1 Scope
This document gives terms and definitions for use in the other parts of ISO 789. Annex A provides a
specimen test report for all parts of ISO 789.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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/
3.1
agricultural tractor
self-propelled agricultural vehicle having at least two axles and wheels, or endless tracks, particularly
designed to pull agricultural trailers and 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: 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]
3.2
wheelbase
distance at ground level between two vertical planes passing through the centres of the front wheels
and the rear wheels with tractor and wheels in the same straight ahead position
Note 1 to entry: See Figure 1.
3.3
track
tread
distance at ground level between two vertical planes passing through the centreline of ground contact
of the tyres parallel to the median longitudinal 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. In the case of track-laying tractors, it is the distance between the two vertical
planes passing through the centreline of ground contact of the tracks.
Note 2 to entry: See Figure 1.
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ISO 789-13:2018(E)

Key
1 wheelbase
2 track
3 track (dual wheels)
Figure 1 — Track and wheelbase of wheeled tractor
3.4
tractor mass
mass of a tractor as submitted for test
3.5
ballasted mass
mass of the tractor with ballasting devices and without the driver mass while the tractor is in running
order with tanks, circuits and radiator full, and any track equipment or additional front wheel drive
components required for a normal use included; and in the case of tractors with pneumatic tyres,
sometimes with liquid ballast in the tyres
[SOURCE: OECD Code 2: February 2017, 2.12]
3.6
unballasted 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.
[SOURCE: ISO 5700:2013, 3.2]
3.7
rated engine speed
engine speed specified by the tractor manufacturer for continuous operation at full load
3.8
maximum engine speed
engine speed at which the throttle control is at the maximum setting
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ISO 789-13:2018(E)

3.9
engine power
power measured at the flywheel or the crankshaft
[SOURCE: OECD Code 2: February 2017, 2.2]
3.10
power take-off power
power measured at any shaft (with the tractor stationary) designed by the tractor manufacturer to be
used as a power take-off
3.11
axle power
sum of the powers measured at all powered axles
3.12
power at the drawbar
power available at the drawbar which can be sustained for at least 20 s, or the time needed to cover a
distance of at least 20 m, whichever is longer
3.13
maximum drawbar pull
mean maximum sustained pull the tractor can maintain at the drawbar over a given distance where the
pull is being exerted horizontally and in the vertical plane containing the longitudinal axis of the tractor
[SOURCE: OECD Code 2: February 2017, 2.6]
3.14
maximum permissible torque
maximum torque specified by the manufacturer for the purpose of a test
3.15
external hydraulic service
source of hydraulic power, derived from the hydraulic system of the agricultural tractor (3.1), available
for use on an implement mounted on, coupled to or otherwise used in conjunction with it
[SOURCE: ISO 10448:1994, 3.1]
3.16
coupler pair
pair of female hydraulic couplers compatible with male couplers as specified in ISO 5675, mounted
on agricultural tractors (3.1) and connected to the hydraulic system to allow flow from one coupler to
the other
[SOURCE: ISO 10448:1994, 3.2]
3.17
available differential pressure
steady state difference of the hydraulic pressure between two male coupler parts on the implement side
[SOURCE: ISO 10448:1994, 3.3]
3.18
maximum pressure
maximum steady state hydraulic pressure at either male coupler connected to a coupler pair (3.16)
[SOURCE: ISO 10448:1994, 3.4]
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ISO 789-13:2018(E)

3.19
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
[SOURCE: ISO 10448:1994, 3.5]
3.20
maximum sump return pressure with coupler
maximum steady state hydraulic pressure at the male coupler returning flow directly to the reservoir
[SOURCE: ISO 10448:1994, 3.6 (1)]
3.21
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
[SOURCE: ISO 10448:1994, 3.6 (2)]
3.22
rated maximum hydraulic pressure
maximum pressure as specified by the tractor manufacturer for continuous use
3.23
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 1 to entry: The calculation does not take into account return pressure losses.
3.24
maximum useable hydraulic power
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 1 to entry: The calculation takes into account the return pressure losses and defines the useable hydraulic
power available.
3.25
peak pressure
maximum instantaneous hydraulic pressure at either male coupler connected to a coupler pair (3.16)
[SOURCE: ISO 10448:1994, 3.7]
3.26
dynamic radius index
effective radius corresponding to the distance travelled by the tractor in one rotation of the driving
wheels (i.e. this distance divided by 2π), when the tractor is driven without drawbar load at a speed of
approximately 3,5 km/h
3.27
non-mechanical drive system
system which has a non-mechanical coupling between the engine and the power take-off
Note 1 to entry: A fluid or electrical power transmission system is considered to be non-mechanical. A cooling
component may be included.
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ISO 789-13:2018(E)

3.28
deviation from rated PTO speed
−1
rotational frequency per unit time (min ) of the PTO output shaft above or below the rated (standard)
PTO rotational frequency of the system
3.29
safety element
air cleaner element fitted downstream of a primary, barrier-type element for the purpose of providing
the engine with protection against dust in the event of either any type of primary element failure, or
dust being present during the removal of the primary element for servicing
3.30
steering control effort
force applied to the steering control in order to steer the tractor
[SOURCE: ISO 10998:2008, 3.2.1]
3.31
turning radius
radius of the circular path described by the centre of tyre contact with the surface of the test site of the
wheel describing the largest circle
3.32
turning diameter
diameter of the circular path described by the centre of tyre contact with the surface of the test site of
the wheel describing the largest circle when the tractor is executing its sharpest practicable turn
Note 1 to entry: See Figure 2.
3.33
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 turn
Note 1 to entry: See Figure 2.
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ISO 789-13:2018(E)

Key
a
Minimum turning diameter.
b
Maximum clearance diameter.
Figure 2 — Turning diameter and clearance diameter
3.34 Fuel consumption
3.34.1
specific fuel consumption
mass of fuel consumed per unit of work
Note 1 to entry: When consumption is measured by mass, to obtain hourly consumption by volume and the work
performed per unit volume of fuel, a conversion of units of mass to units of volume shall be made using the fuel
density value at 15 °C. When consumption is measured by volume, the mass of fuel per unit of work shall be
calculated using the density corresponding to the fuel temperature at which the measurement was made. This
figure shall then be used to obtain hourly consumption by volume and the work performed per unit volume of
fuel, using the density value at 15 °C for conversion from units of mass to units of volume
[SOURCE: OECD Code 2: February 2017, 2.7.2]
3.34.2
specific energy
work per unit volume of fuel consumed
[SOURCE: OECD Code 2: February 2017, 2.7.3]
3.35
specific reagent consumption
mass of reagent consumed per unit of work
[SOURCE: OECD Code 2: February 2017, 2.8.1.1]
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ISO 789-13:2018(E)

3.36
diesel particulate filter
DPF
system which traps particulate matter and either passively or actively converts the trapped particulate
matter into carbon dioxide and ash
Note 1 to entry: The carbon dioxide is released to the atmosphere and the ash is stored within the DPF.
3.37
slip
percentage difference of theoretical maximum possible distance travelled and the actual distance
travelled
3.38 Reference planes
3.38.1 Vertical reference planes
3.38.1.1
transverse plane
vertical plane containing the centreline of the rear axle
3.38.1.2
transverse plane
vertical plane containing the centreline of the driving sprocket axle
3.38.1.3
longitudinal median plane
median longitudinal plane
symmetric longitudinal 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
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.
[SOURCE: ISO 5700:2013, 3.8]
3.38.2
horizontal reference plane
ground level in which a hard contact is assumed
3.39 Coordinates of the centre of gravity
3.39.1
horizontal fore-and-aft coordinate
x
horizontal distance of the centre of gravity from the traverse reference plane
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ISO 789-13:2018(E)

3.39.2
vertical coordinate
h
vertical distance of the centre of gravity from the horizontal reference plane
3.39.3
lateral coordinate
y
horizontal distance of the centre of gravity from the median longitudinal plane of the tractor
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ISO 789-13:2018(E)

Annex A
(informative)

Specimen ISO 789 test report
A.1 General
Tractor manufacturer’s name and address:


Location of tractor assembly:
Submitted for test by:
Selected for test by:
Location of running-in:
Duration of running-in:
Location of test:
A.2 Specification of tractor
A.2.1 Identification
Make and model:
Model(s) for other countries:
Type (2WD, 4 WD, rubber tracks, articulated
4 WD, articulated 4 WD with duals, etc.):
Serial No.:
Transmission type or gears × ranges:
Maximum designed grounds speed version:                                            km/h
A.2.2 Engine
Make / Model / Type:

Serial No.:
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ISO 789-13:2018(E)

A.2.2.1 Cylinders
Number / disposition:
Bore / stroke:                                            mm/mm
3
Capacity:                                            cm
Compression ratio:
Arrangement of valves:
Cylinder liners (wet or dry):
A.2.2.2 Supercharging
Make / Model / Type:
Pressure:                                            MPa
A.2.2.3 Fuel and injection system
Fuel system:
Make / Model / Type of fuel filter(s):
— Primary:
— Secondary:
3
Capacity of fuel tank:                                            dm
Make / Model / Type of injection pump:
— Serial No.:
Manufacturer’s production setting:
3
— Flow rate:                                            dm /h
— Timing:
Make / Model / Type of injectors:
Injection pressure:                                            MPa
Make / Model / Type of carburettor:
A.2.2.4 Governor
Make / Model / Type:
−1 −1
Governed range of engine speed from               min to               min
−1
Rated engine speed:                                            min
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ISO 789-13:2018(E)

A.2.2.5 Air cleaner
Pre-cleaner:
— Make / Model / Type:
— Location of air intake:
Main cleaner:
— Make / Model / Type
Primary:
Secondary:
— Location of air intake:
Maintenance indicator:
A.2.2.6 Lubrication system
Type of feed pump:
Type of filter(s):
Number of filers:
A.2.2.7 Cooling system
Type of coolant:
Type of pump:
Specification of fan or blower:
— Number of fan blades:
— Fan diameter:                                                mm
3
Coolant capacity:                                                dm
Type of temperature control:
Over-pressure system:                                                kPa
A.2.2.8 Starting system
Make / Model / Type:
Starter motor power rating:                                                kW
Cold starting aid:
Safety device:
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ISO 789-13:2018(E)

A.2.2.9 Electrical system
Voltage:                                                V
Generator:
— Make / Model / Type:
— Power:                                                kW
Battery of accumulators:
— Number:
— Rating:                   Ah  at            hours
Over-pressure system:                                                kPa
A.2.2.10 Exhaust system
Make / Model / Type:
Location:
A.2.2.11 Reagent injection system (if applicable)
Make / Model / Type:
Location:
Specifications of the reagent used:
A.2.2.12 Diesel particulate filter (if equipped)
Make / Model / Type:
Maximum allowable turbine outlet pressure:
Change in power at fully loaded rated engine speed between a clean DPF
and one that has achieved the maximum allowable soot loading:
Special operational procedures required if the tractor is operated for long
periods of time at low load factors:
The average of the time between regenerations that occur during each of
the tests at the 3 load conditions in ISO 789-1:2018, 6.2.1; 6.4.1 c); and 6.4.1
d) shall be declared. Should this interval exceed 50 h, this shall be stated:
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ISO 789-13:2018(E)

A.2.3 Transmission
A.2.3.1 Clutch
Make / Model / Type:
Number of plates:
Diameter of plates:                                                mm
Method of operation:
A.2.3.2 Gear box
Make / Model / Type:
Description:
Table A.1 — Gear box
Forward Reverse
Number of ranges/groups
Number of gears
Total of arrangements
Available options:

A.2.3.3 Rear axle and final drives
Make / Model / Type:
Differential lock:
— Type:
...