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Diagnose and repair winches and pulley block assemblies on heavy machinery or equipment

Level / 4
Credits / 2

Purpose This unit standard is for people in the automotive repair industry. People credited with this unit standard are able to: diagnose automotive heavy equipment winch faults; overhaul automotive heavy equipment winches; and rectify pulley block assembly faults.

Subfield / Motor Industry
Domain / Automotive Workshop Engineering
Status / Registered
Status date / 20 March 2008
Date version published / 20 March 2008
Planned review date / 31 December 2012
Entry information / Open.
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 and publications relevant to this unit standard include but are not limited to – Health and Safety in Employment Act 1992; Health and Safety in Employment (Pressure Equipment, Cranes, and Passenger Ropeways) Regulations 1999; Approved Code of Practice for Cranes, (Wellington: Department of Labour, 2007).

2 Approved Code of Practice for Cranes is available online from the Department of Labour website http://www.osh.govt.nz/order/catalogue/10.shtml.

3 Definitions

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.

Suitable tools and equipment means industry approved tools and equipment that are recognised within the industry as being the most suited to complete the task in a professional and competent manner with due regard to safe working practices.

4 For this unit standard, it is essential that the practical assessment evidence is obtained in the workplace under normal workplace conditions.

Elements and performance criteria

Element 1

Diagnose automotive heavy equipment winch faults.

Range one of – single drum tractor winch, single drum vehicle mounted winch.

Performance criteria

1.1 Safe working practices are observed throughout the task in accordance with legislative requirements.

Range personal safety, safety of others, workshop safety, environmental safety, tools and equipment safety.

1.2 Suitable tools and equipment are selected and used that enable winch faults to be diagnosed in accordance with service information.

1.3 The winch is operated using its maximum rated load, and its performance in each mode of operation noted, in accordance with service information.

Range pay-out, power-out, winch-in against load, hold against load.

1.4 Hydraulic controls are inspected for faults, and the results noted, in accordance with service information.

Range fluid level, external fluid leaks, internal fluid leaks.

1.5 A repair procedure is determined from the winch inspection and test results to return the equipment to within manufacturer specifications.

Element 2

Overhaul automotive heavy equipment winches.

Range one of – single drum tractor winch, single drum vehicle mounted winch.

Performance criteria

2.1 Safe working practices are observed throughout the task and safety precautions taken before work is started in accordance with legislative requirements.

Range personal safety, safety of others, equipment safety, workshop safety, environmental safety, tools and equipment safety;

safety precautions – primary drive stopped or disconnected, hydraulic pressure removed, suspended loads lowered or blocked, machine secured against movement.

2.2 Suitable tools and equipment are selected and used that enable winches to be overhauled in accordance with service information.

2.3 Bevel pinion and bevel gear tooth markings are taken and backlash measured, and noted for use in reassembly, in accordance with service information.

2.4 Taper bearing preloads are determined, and noted to assist in reassembly, in accordance with service information.

2.5 The winch and its controls are dismantled, and all parts cleaned and inspected for wear and damage, in accordance with service information.

2.6 Parts found to be worn and damaged beyond the limits specified by the manufacturer are replaced with approved replacement parts in accordance with company requirements.

2.7 The winch and its controls are reassembled following the procedures specified by the manufacturer, and lubricated during assembly in accordance with service information.

2.8 Bearing preloads and bevel gear to pinion meshing and backlash allowance are adjusted to meet manufacturer requirements when new parts are fitted.

2.9 Brake and clutch adjustments are made to ensure the winch operates in accordance with manufacturer specifications in each operating mode.

2.10 The winch hydraulic controls are checked to ensure the winch responds correctly in each operating mode in accordance with manufacturer specifications.

Element 3

Rectify pulley block assembly faults.

Range single and multiple pulley block assemblies.

Performance criteria

3.1 Safe working practices are observed throughout the task in accordance with legislative requirements.

Range personal safety, safety of others, equipment safety, workshop safety, environmental safety, tools and equipment safety.

3.2 Suitable tools and equipment are selected and used that enable pulley block assembly faults to be rectified in accordance with service information.

3.3 The pulley block is inspected for wear and damage in accordance with service information.

Range groove wear, cracking, fracture, bush wear, pin wear, mounting side wear, security.

3.4 The pulley block is returned to full serviceability by replacement of worn and damaged parts with approved replacement parts in accordance with service information.

3.5 The pulleys are lubricated in accordance with service information.

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) if you wish to suggest changes to the content of this unit standard.

Ó New Zealand Qualifications Authority 2008