Application
This unit describes the performance outcomes required to diagnose and repair faults in powershift transmissions. It involves preparing for the task, selecting the correct diagnostic procedure, carrying out the diagnosis and the repair, performing post-repair testing, and completing workplace processes and documentation.
It applies to those working in the automotive service and repair industry. The powershift transmissions include those in agricultural machinery or mobile plant machinery.
No licensing, legislative, regulatory or certification requirements apply to this unit at the time of publication.
Elements and Performance Criteria
Elements Elements describe the essential outcomes. | Performance Criteria Performance criteria describe the performance needed to demonstrate achievement of the element. Where bold and italicised text is used, further information is detailed in the range of conditions section. |
1. Prepare to diagnose and repair powershift transmission | 1.1 Job requirements are determined from workplace instructions 1.2 Diagnostic information is sourced and interpreted 1.3 Diagnostic options are analysed and those most appropriate to the circumstances are selected 1.4 Hazards associated with the work are identified and risks are managed 1.5 Diagnostic tools and equipment are selected and checked for serviceability |
2. Diagnose powershift transmission | 2.1 Diagnostic tests are carried out according to manufacturer specifications, workplace procedures, and environmental and safety requirements 2.2 Faults are identified from diagnostic test results and causes of faults are determined 2.3 Diagnosis findings, including recommendations for necessary repairs or adjustments, are reported according to workplace procedures |
3. Repair powershift transmission | 3.1 Repair information is sourced and interpreted 3.2 Repair options are analysed and those most appropriate to the circumstances are selected 3.3 Repair tools, equipment and materials are selected and checked according to manufacturer procedures 3.4 Repairs and component replacements and adjustments are carried out according to manufacturer specifications, workplace procedures, and safety and environmental requirements, and without causing damage to components or systems 3.5 Post-repair testing is carried out according to workplace procedures to confirm fault rectification, and any further problems detected as having been introduced during the repair process are rectified |
4. Complete work processes | 4.1 Final inspection is made to ensure work is to workplace expectations and machinery or transmission is presented ready for use 4.2 Work area is cleaned, waste and non-recyclable materials are disposed of, and recyclable material is collected 4.3 Tools and equipment are checked and stored according to workplace procedures 4.4 Workplace documentation is processed according to workplace procedures |
Evidence of Performance
Before competency can be determined, individuals must demonstrate they can perform the following according to the standards defined in this unit’s elements, performance criteria, range of conditions and foundation skills:
diagnose and repair a fault in two different vehicles or machines with the following powershift transmissions:
multiple countershaft transmission
planetary shift transmission
conduct powershift transmission stall test during above work according to manufacturer specifications and workplace procedures.
Evidence of Knowledge
Individuals must be able to demonstrate knowledge of:
work health and safety (WHS) and occupational health and safety (OHS) requirements relating to diagnosing and repairing powershift transmissions, including procedures for isolating and stabilising machines
environmental requirements, including procedures for trapping, storing and disposing of hydraulic fluid released from powershift transmissions
operating principles of powershift transmissions and associated components, including:
torque converters, torque divider torque converters and variable capacity torque converters
electronically modulated transmission
countershaft transmissions, including:
gear types
gear ratios and torque reduction and multiplication
simple and compound gear trains
compound planetary transmissions, including:
gear types
gear ratios and torque reduction and multiplication
simple and compound planetary gear trains
transmission control valves and solenoids
hydraulic circuits and schematics
application, purpose and operation of powershift transmissions and components, including:
power flows in:
multiple countershaft transmissions
compound planetary transmissions
torque converters, torque divider torque converters, and variable capacity torque converters
hydraulic components and hydraulic control components, including:
oil pumps
hydraulic valves
electronic transmission pressure modulation
power train electronic control system
mechanical components, including:
clutch packs
one-way clutches
planetary gears
compound gear sets
powershift electronic control systems
transfer cases
hydraulic oils and filters
diagnostic testing procedures for powershift transmissions, including:
following safety requirements when stall testing
stall testing according to manufacturer specifications and workplace procedures
dismantling procedures for powershift transmissions, including:
measuring clearances and tolerances
inspecting components
repair procedures for powershift transmissions, including procedures for inspecting, evaluating and measuring component wear
post-repair testing procedures for powershift transmissions, including:
stall testing
Assessment Conditions
Assessors must satisfy NVR/AQTF assessor requirements.
Competency is to be assessed in the workplace or a simulated environment that accurately reflects performance in a real workplace setting.
Assessment must include direct observation of tasks.
Where assessment of competency includes third-party evidence, individuals must provide evidence that links them to the powershift transmissions that they have worked on, e.g. repair orders.
Assessors must verify performance evidence through questioning on skills and knowledge to ensure correct interpretation and application.
The following resources must be made available:
automotive repair workplace or simulated workplace
workplace instructions
manufacturer powershift transmission specifications
two different vehicles or machines with powershift transmission faults
diagnostic equipment for powershift transmissions
tools, equipment and materials appropriate for repairing and adjusting powershift transmissions.
Foundation Skills
This section describes those language, literacy, numeracy and employment skills that are essential to performance and are not explicit in the performance criteria.
Skills | Description |
Learning skills to: | locate appropriate sources of information efficiently. |
Reading skills to: | interpret information from manufacturer and workshop literature when seeking powershift transmission specifications and procedures interpret powershift transmission hydraulic and electrical circuit diagrams. |
Writing skills to: | legibly and accurately fill out workplace documentation when reporting diagnostic findings, making repair recommendations, and recording parts and material used. |
Oral communication skills to: | clarify instructions report diagnostic findings and make repair recommendations. |
Numeracy skills to: | measure powershift transmission components and use basic mathematical operations, including addition, subtraction, multiplication and division, to calculate ratios, distances, tolerances and deviations from manufacturer specifications interpret hydraulic pressure gauges and other measuring equipment. |
Planning and organising skills to: | plan own work requirements and prioritise actions to achieve required outcomes and ensure tasks are completed within workplace timeframes. |
Technology skills to: | operate diagnostic and testing equipment conduct performance testing of components, systems and equipment. |
Range Statement
This section specifies work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included. Bold italicised wording, if used in the performance criteria, is detailed below.
Safety requirements must include: | work health and safety (WHS) and occupational health and safety (OHS) requirements, including procedures for isolating and stabilising machines. |
Environmental requirements must include: | procedures for trapping, storing and disposing of hydraulic fluid released from powershift transmissions. |
Sectors
Technical - Transmission
Competency Field
Mechanical - Mobile Plant