24323 version 1
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Demonstrate knowledge of tractor and agricultural machine final drive
assemblies
Level
4
Credits
4
Purpose
This theory-based unit standard is for people in the agricultural equipment
repair industry. People credited with this unit standard are able to
demonstrate knowledge of tractor and agricultural machine final drive
assemblies.
Subfield
Motor Industry
Domain
Automotive Transmission Systems
Status
Registered
Status date
25 February 2008
Date version published
25 February 2008
Planned review date
31 December 2012
Entry information
Recommended: Unit 2316, Demonstrate knowledge of
heavy vehicle and machine driveline and drive assembly
operation and terminology, or demonstrate equivalent
knowledge and skills.
Replacement information
This unit standard and unit standard 24324 replaced unit
standard 5441.
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
Definition
Service information may include but is not limited to – technical information of a vehicle,
machine, or product detailing operation; installation and servicing procedures;
manufacturer instructions and specifications; technical terms and descriptions; and
detailed illustrations. This can be accessed in hard copy or electronic format and is
normally sourced from the manufacturer.
 New Zealand Qualifications Authority 2016
24323 version 1
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Elements and performance criteria
Element 1
Demonstrate knowledge of tractor and agricultural machine final drive assemblies.
Performance criteria
1.1
Final drive assembly construction is described in accordance with service
information.
Range
1.2
Tractor differential lock assembly and limited slip differential assembly
construction and operation are described in accordance with service
information.
Range
1.3
includes but is not limited to – power divider differential
assemblies, direct drive from tractor main drive shaft, manual
engagement, hydraulic engagement, electronic engagement.
Tractor and agricultural machinery driveshaft operation, and method of
installation, are described in accordance with service information.
Range
1.6
includes but is not limited to – bull gears, inboard epicyclic gear
trains, drive hub epicyclic gear trains.
Tractor and agricultural machinery transfer case construction and operation are
described in accordance with service information.
Range
1.5
includes but is not limited to – features, identification of
components, layout and operation of components, purpose.
Tractor and agricultural machinery drive gear reduction unit construction and
operation are described in accordance with service information.
Range
1.4
includes but is not limited to – wheeled tractors, combine
harvesters, specialist self-propelled harvesters;
features, identification of components, layout of components.
includes but is not limited to – universal joints, slip joints, shaft
phasing, angles and balancing, safety shear pins, torque shafts.
Tractor front axle differential unit construction and operation are described in
accordance with service information.
Range
includes but is not limited to – crown wheel and pinion, ratios
matching front and rear differentials, the influence of tyre sizes.
 New Zealand Qualifications Authority 2016
24323 version 1
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1.7
Tractor four wheel drive front steering and drive axle systems are described in
accordance with service information.
Range
1.8
Tractor front wheel hub construction is identified in accordance with service
information.
Range
1.9
includes but is not limited to – king pin assemblies, hub carrier
assemblies, bearings.
Harvesting machine final drive unit with variable speed transmission operation is
described in accordance with service information.
Range
1.10
includes but is not limited to – universal joints, tractor constant
velocity joints, geared right angle drives.
includes but is not limited to – hydraulic drive, continuous variable
transmission, friction cones.
Tractor and agricultural machinery final drive assembly, and limited slip
differential assembly diagnosing and repair procedures are described in
accordance with service information.
Range
includes but is not limited to – removal, inspection, reassembly,
settings, adjustments.
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.
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