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AS 4457.2:2024
[Current]Earth-moving machinery - Off-the-road wheels, rims and tyres - Maintenance and repair, Part 2: Tyres
AS 4457.2:2024 sets requirements for the identification, inspection, repair, retreading and maintenance of off-the-road (OTR) pneumatic tyres in order to assist repairers and retreaders of tyres and users of earth-moving machinery to minimize health and safety risks.
Published: 13/12/2024
Pages: 30
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Introduction
1 Scope and general
1.1 Scope
1.2 Normative references
1.3 Terms and definitions
2 Maintenance of in-service tyres (practical maintenance)
2.1 Selection of tyre
2.2 Mounting inspection
2.3 Periodic inspection
2.4 Handling, transport and storage
3 Inspection to determine repairability
3.1 General
3.2 Internal inspection
3.3 External inspection
4 Repair limits
4.1 General
4.2 Repair limits for bias ply tyres
4.2.1 Minor repairs
4.2.2 Intermediate repairs
4.2.2.1 General
4.2.2.2 Calculated permissible repair dimension for crown damage
4.2.2.3 Calculated permissible repair dimension for sidewall and shoulder damage
4.2.3 Major repairs
4.2.3.1 General
4.2.3.2 Calculated permissible repair dimension for crown damage
4.2.3.3 Calculated permissible repair dimension for sidewalls and shoulder damage
4.2.4 Irreparable damage to bias ply tyres
4.3 Repair limits for radial tyres
4.3.1 Minor repairs
4.3.1.1 General
4.3.1.2 Calculated permissible repair dimension for crown damage
4.3.2 Intermediate repairs
4.3.2.1 General
4.3.2.2 Calculated permissible intermediate repair dimension for crown
4.3.2.3 Calculated permissible repair dimension for sidewall
4.3.3 Major repairs
4.3.3.1 General
4.3.3.2 Calculated permissible repair dimension for crown
4.3.3.3 Calculated permissible repair dimension for sidewall, shoulder and chamber damage
4.3.4 Irreparable damage to radial ply tyres
4.3.5 Number of repairs
4.3.5.1 Number of repairs to bias ply tyres
4.3.5.2 Number of repairs to radial ply tyres
4.4 Disposal of irreparable tyres
5 Method of repair
5.1 General
5.2 Repair principles
5.2.1 General principles
5.2.2 Preparation of damage for repairing
5.2.3 Minor repair principles
5.2.4 Intermediate repair principles
5.2.5 Major repair principles
5.3 Measurement of damage
5.4 Damage area preparation
5.5 Patch application
5.6 Curing
5.6.1 General
5.6.2 Hot-curing
5.6.3 Hot cure of tread and sidewall repair rubber
5.6.4 Hot cure repair rubber (plug) and/or cold (chemical) cured patch system
5.6.5 Cold curing (chemical) patch application
5.7 Inspection after curing
5.7.1 Visual inspection of repair
5.7.2 Final inspection
6 Retreading of tyres
6.1 General
6.1.1 Restrictions
6.1.2 Use of materials
6.1.3 Buffing
6.1.4 Inspection after buffing
6.1.5 Buffing damage
6.1.5.1 Bias ply tyres
6.1.5.2 Radial ply tyres
6.1.6 Repairs
6.1.7 Cement or solution application
6.1.8 Undertread gauge
6.1.9 Building
6.1.9.1 General
6.1.9.2 Tread wear indicators
6.1.10 Curing
6.1.11 Inspection
6.2 Load and speed index for retreaded tyres
6.3 Marking of retreaded tyres
7 Marking of repaired tyres
7.1 Repaired tyre identification
7.2 Single (X) marking
7.3 Double (XX) marking
7.4 Triple (XXX) marking
7.5 Retreaded tyre identification
8 Maintenance of tyres (service records)
8.1 Recording
8.2 Service record
8.3 Recorded history
8.4 Repairs and retreading
8.5 Sale or transfer of tyres
8.6 Replacement of tyre identification
Appendix A
Bibliography
Cited references in this standard
[Current]
Earth-moving machinery - Off-the-road wheels, rims and tyres - Maintenance and repair, Part 1: Wheel assemblies and rim assemblies
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