23940 version 1
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Level 3
Credits 5
Purpose This theory-based unit standard is for people in the trailer boat repair and related marine engineering industries. People credited with this unit standard are able to demonstrate knowledge of hydraulic principles applying to trailer boat components, and hydraulic systems and components used in trailer boat applications.
Subfield Motor Industry
Domain
Status
Status date
Date version published
Trailer Boat Systems
Registered
21 September 2007
21 September 2007
Planned review date
Entry information
31 December 2012
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 relevant to this unit standard includes but is not limited to – Health and
Safety in Employment Act 1992.
2 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.
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New Zealand Qualifications Authority 2020

23940 version 1
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Element 1
Demonstrate knowledge of hydraulic principles applying to trailer boat components.
Performance criteria
1.1 The roles of pressure and flow in marine hydraulics are described in accordance with service information.
Range forces, energy transfer, work, power.
1.2 The relationship between hydrodynamics and hydrostatics is defined in accordance with service information.
Range energy principles applicable to trailer boat components.
1.3 Safety rules are explained in relation to working with hydraulic equipment in accordance with legislative requirements.
Range includes but is not limited to – relieving system pressure before disconnecting oil lines, leaving the system unattended, working and blocking a raised system, removing components, checking line connections, observing safety signs, correct use of personal protective equipment (glasses, protective footwear, no loose clothing), making repairs on the boat, avoiding hot fluids and parts.
Element 2
Demonstrate knowledge of hydraulic systems and components used in trailer boat applications.
Performance criteria
2.1 A layout of main components used in a marine equipment application is described in accordance with service information.
Range may include but is not limited to – steering system, anchoring system, bow thrusters, stabilisers, transmission, deck hoist, trailer brakes, auxiliary power sources or helm pumps, tilt or trim cylinders.
2.2
2.3
Flow diagrams are plotted from working hydraulic circuits.
The purpose and operation of hydraulic pumps are described in accordance with service information.
Range gear, piston, vane.
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New Zealand Qualifications Authority 2020

23940 version 1
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2.4 The types and operation of control valves are described in accordance with service information.
Range directional, pressure, flow-volume, pilot, open and closed centre.
2.5 The function and operation of actuators are described in accordance with service information.
Range linear (single acting and double acting cylinders and rams), rotary
(hydraulic motors – gear, vane, piston).
2.6 The functions and operations of hydraulic oil and filters are described in relation to marine hydraulic systems.
Range oil acting as a control medium, cooling, lubricating, cleaning; oil properties effects on a marine environment.
2.7 The construction of hydraulic lines, hoses, and pressure fittings are described in relation to hydraulic manufacturer specifications.
2.8 Installation procedures for hydraulic lines, hoses, and pressure fittings are described 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) janet.lane@mito.org.nz
if you wish to suggest changes to the content of this unit standard.
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New Zealand Qualifications Authority 2020