24459 version 1
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Demonstrate knowledge of tractor and agricultural machinery tyres and
wheels
Level
3
Credits
4
Purpose
This theory-based unit standard is for people in the agricultural machinery
repair industry. People credited with this unit standard are able to
demonstrate knowledge of: tractor and agricultural machinery tyre types and
sizes; tyre damage, repair techniques and maintenance requirements; and
tractor and agricultural machinery wheels.
Subfield
Motor Industry
Domain
Tyres
Status
Registered
Status date
25 January 2008
Date version published
25 January 2008
Planned review date
31 December 2012
Entry information
Open.
Replacement information
This unit standard and unit standard 24460 replaced unit
standard 5440.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
NZ Motor Industry Training Organisation (Incorporated)
Accreditation and Moderation Action Plan (AMAP) reference
0014
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
Legislation relevant to this unit standard includes but is not limited to – Land
Transport Rule: Tyres and Wheels 2001, Rule 32013.
2
Land Transport Rules are produced for the Minister of Transport by Land Transport
New Zealand. These rules are available online at
http://www.landtransport.govt.nz/rules/.
 New Zealand Qualifications Authority 2016
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3
Definition
Agricultural machinery refers to any machine or equipment used in maintenance,
harvesting and cultivation on farms. These include but are not limited to – tractors,
ploughs and tillers, graders, post rammers, weed control implements, hay mowers,
hay balers, feed-out wagons, harvesters, combine harvesters.
Elements and performance criteria
Element 1
Demonstrate knowledge of tractor and agricultural machinery tyre types and sizes.
Performance criteria
1.1
Tyre patterns are described, and applicable use identified for each type, in
accordance with tyre manufacturer specifications.
Range
1.2
Tyre sizes are defined in accordance with tyre manufacturer specifications.
Range
1.3
includes but is not limited to – cross ply (rayon and nylon); radial
(rayon and nylon); steel belted plies; beads, side walls, apexes
and chafers; rubber compounds.
Dynamic rolling circumference is described in accordance with tyre
manufacturer specifications.
Range
1.5
includes but is not limited to – measurement relating to rim
diameter and tyre section width, low profile aspect ratio, side wall
markings (speed and loading indexing characteristics).
Tyre construction is described in accordance with tyre manufacturer
specifications.
Range
1.4
includes but is not limited to – basic lug pattern (directional, angle
of lugs, length of lug to centre line, industrial lug), grass or turf
pattern, flotation and soil compaction, front non-driving tyres (tririb, broken tri-rib, multi-rib).
includes but is not limited to – matching tyre circumferences for
four-wheel drive and wheel assisted machines, front tyre lead
(performance, safe handling, mechanical considerations of the
machine).
Tyre valve types are described in accordance with tyre manufacturer
specifications.
Range
includes but is not limited to – water valves, dry valves, tubeless
stems, tube stems.
 New Zealand Qualifications Authority 2016
24459 version 1
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Element 2
Demonstrate knowledge of tyre damage, repair techniques, and maintenance
requirements.
Performance criteria
2.1
Tyre wear is described in accordance with tyre or machine manufacturer
descriptions.
Range
2.2
Tyre rupture is identified in accordance with tyre manufacturer description.
Range
2.3
includes but is not limited to – broken tyre walls, lug damage
through spinning, staking, ozone cracking, petroleum and
herbicide deterioration.
Tyre repair methods are described in accordance with tyre manufacturer
recommendations.
Range
2.4
includes but is not limited to – under-inflation wear pattern, overinflation wear pattern.
includes but is not limited to – permanent vulcanising, cold
chemical cure, temporary boots, tyre ‘worms’.
Tyre maintenance criteria are described in accordance with tyre manufacturer
recommendations.
Range
includes but is not limited to – pressures, hard surface, soft
surface, ballast, anti-freeze, water, calcium chloride, petroleum
product and herbicide contamination, deterioration prevention.
Element 3
Demonstrate knowledge of tractor and agricultural machinery wheels.
Performance criteria
3.1
Rim and wheel disc configurations are described in accordance with machine
manufacturer specifications.
Range
includes but is not limited to – single well rims, dual rims, wheel
discs and settings, power adjusted rims.
Please note
Providers must be accredited by NZQA, or an inter-institutional body with delegated
authority for quality assurance, before they can report credits from assessment against
unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by NZQA before they can register
credits from assessment against unit standards.
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Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations
wishing to develop education and training programmes, such as minimum qualifications for
tutors and assessors, and special resource requirements.
Comments on this unit standard
Please contact the NZ Motor Industry Training Organisation (Incorporated)
info@mito.org.nz if you wish to suggest changes to the content of this unit standard.
 New Zealand Qualifications Authority 2016