ISO 4251-5:1988

Tyres and rims (existing series) for agricultural tractors and machines — Part 5: Log skidder tyres

Pneus et jantes (séries existantes) pour tracteurs et machines agricoles — Partie 5: Pneumatiques pour engins forestiers traînant des grumes

General Information

• Status: Withdrawn
• Publication Date: 11-May-1988
• Withdrawal Date: 11-May-1988
• ICS: 83.160.30 - Tyres for agricultural machinery
• Technical Committee: ISO/TC 31/SC 5 - Agricultural tyres and rims
• Drafting Committee: ISO/TC 31/SC 5 - Agricultural tyres and rims
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 12-Mar-1992

Relations

• Revised: ISO 4251-5:1992 - Tyres (ply rating marked series) and rims for agricultural tractors and machines — Part 5: Logging and forestry service tyres
• Effective Date: 15-Apr-2008

Standards Content (Sample)

IS0
INTERNATIONAL STANDARD
425 1-5
First edition
1988-05-1 5
-
-
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
ORGANISATION INTERNATIONALE DE NORMALISATION
MEXnYHAPOnHAR OPïAHM3AuMR fl0 CTAHnAPTM3AuMM
Tyres and rims (existing series) for agricultural tractors
and machines -
Part 5:
Log skidder tyres
Pneus et jantes (séries existantesl pour tracteurs et machines agricoles -
Partie 5: Pneumatiques pour engins forestiers traînant des grumes
Reference number
IS0 4251-5: 1988 (E)

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Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards bodies (IS0 member bodies). The work of preparing International
Standards is normally carried out through IS0 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, govern-
mental and non-governmental, in liaison with EO, also take part in the work. IS0 O
collaborates closely with the International Electrotechnical Commission (IEC) on all
matters of electrotechnical standarization.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council. They are approved in accordance with IS0 procedures requiring at
least 75 % approval by the member bodies voting.
International Standard IS0 4251-5 was prepared by Technical Committee ISO/TC 31,
Tyres, rims and valves.
Users should note that all International Standards undergo revision from time to time
and that any reference made herein to any other International Standard implies its
latest edition, unless otherwise stated.
0 International Organization for Standardization, 1988 0
Printed in Switzerland

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IS0 4251/5 : 1988 (E)
INTERNATIONAL STANDARD
Tyres and rims (existing series) for agricultural tractors
and machines -
Part 5:
Log skidder tyres
1 Scope and field of application basic tyre load for log skidders: Maximum load of total ve-
hicle mass with accessories plus load increases due to log
This part of IS0 4251 sets out the designation, dimensions, winching or grappling loads and mass transfer that is imposed
load ratings and rim coordination of existing series of log skid- on an individual tyre due to total radial forces during operation.
der tyres of diagonal construction.
O
Rim dimensions are given in IS0 4251-3. 4 Marking
The marking of existing series of tyres for log skidders shall
consist of designations of the tyre size and load rating; ad-
ditional information shall be as specified in IS0 4251-1.
2 References
IS0 4223-1, Definitions of some terms used in the tyre in-
5 Dimensions and tolerances
dustry - Part 1: Pneumatic tyres.
Standard sizes, measurement rims, design dimensions of new,
IS0 4251 -1, Tyres and rims (existing series) for agricultural
diagonal construction log skidder tyres, of both normal and low
tractors and machines - Part 1: Tyre designation and dimen-
section height, and maximum tyre dimensions in service shall
sions.
be as given in table 1.
IS0 4251-3, Tyres and rims (existing series) for agricultural
tractors and machines - Part 3: Rims.
6 Tyre load ratings
6.1 Basic tyre loads for log skidder tyres of diagonal con-
struction, and normal and low section height, for a maximum
3 Definitions
speed of 30 km/h are given in table 2. The loads given are
For the purposes of this part of IS0 4251, the definitions given maximum values and are valid for the inflation pressures
in IS0 4223-1 apply, together with the following definition. indicated.
1

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Design new tyre in service')
Tyre size Measurement
rim width code Section Overall Maximum Maximum
designation
width diameter2) overall width overall diameter
18.4 - 26 16 467 1 476 504 1 525
18.4 - 34 16 467 1 679 504 1 728
23.1 - 26 20 587 1 632 634 1691
24.5 - 32 21 622 1831 672 1 892
28 L - 26 25 714 1644 77 1
I 703
30.5 L - 32 27 775 1 847 837 1 909
I
2) Minimum new tyre overall diameter is calculated on the basis of a tolerance of -3 % on design section height.
10 PR 12 PR 14 PR 16 PR
Tyre size
BTL IP BTL IP BTL IP BTL IP
designation
kg kPa kg kPa kg k Pa
kg kPa
18.4 - 26 2 580 170
18.4 - 34 2 920 170
23.1 - 26 3 245 140
24.5 - 32 4 495 170
rnL-26 3 760 140 4 285 170
30.5 L - 32 4 710 140 5 370 170
6.2 For logging operations with a maximum speed of Table 3 - Tyre loads at different speeds
(load-speed relationship)
8 km/h, tyre loads may be increased to 110 % of the values
given in table 2 with no increase in inflation pressure.
Maximum speed
1 Maximum tyre load')
I km/h
I
15 1 20
6.3 For transport service and operations which do not require
25 110
sustained high torque, the loads at various speeds given in
30 100
table 3 apply with no change in inflation pressure.
40 90
I l I
1) Expressed as a percentage of the basic tyre loads given in table 2.
2

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IS0 4251-5 : 1988 (E)
7 Rims Table 4 - Approved rim contours
Mëasurernent Approved
Tyre size
7.1 Rim contours
rim contours
designation rim width code
See IS0 4251-1.
I 18.4-26 I 16 I DW16A [
I 18.4 - 34 I 16 I DW16A I
7.2 Rim coordination
I 23.1 -26 I 20 I DW20A I
In addition to the measurement rim width given in table 1, the
I 24.5 - 32
approved rim contours are given in table 4 for tyres for log skid-
I 21 I DDH2:lA I
ders with normal and low section height.
28L-26 25 DW 25 A
8 Tubes
DW 27 A
I 27 I DH27 I
Whenever an inner tube is required, it shall be identified by the
same designation as the size of the tyre in which it is to be
mounted.
3

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IS0 4251-5 : 1988 (E)
UDC 626.114.73.012.5
Descriptors : agricultural machinery, agricultural tractors, tyres, designation, dimensions, loads (forces), load capacity.
Price based on 3 pages

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IS0
NORME INTERNATIONALE 425 1-5
Première édition
1988-05- 15
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
ORGANISATION INTERNATIONALE DE NORMALISATION
MEXAYHAPOAHAR OPiAHM3AuMR il0 CTAHAAPTM3AuMM
Pneus et jantes (séries existantes) pour tracteurs et
machines agricoles -
Partie 5:
Pneumatiques pour engins forestiers traînant des grumes
Tyres and rims (existing series) for agricultural tractors and machines -
Part 5: Log skidder tyres
Numéro de référence
IS0 4251-5: 1988 (F)

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Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale
d'organismes nationaux de normalisation (comités membres de I'ISO). L'élaboration
des No
...