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Elements and Performance Criteria

  1. Prepare to diagnose and repair mobile plant hydraulic system
  2. Diagnose hydraulic system
  3. Repair hydraulic system
  4. Complete work processes
  5. Prepare to diagnose and repair mobile plant hydraulic system
  6. Diagnose hydraulic system
  7. Repair hydraulic system
  8. Complete work processes

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.

Mobile plant hydraulic system must include:

reservoirs

accumulators

pumps

valves

actuators

motors

filters

hoses, pipes, fittings and couplings.

Diagnostic tests must include:

using pressure gauges and flow meters to determine system pressure settings, pump output and individual system component internal leakage.

Safety and environmental requirements must include:

work health and safety (WHS) and occupational health and safety (OHS) requirements, including procedures for:

using raising, lowering and supporting equipment

isolating and stabilising machines

working with stored hydraulic pressure

working with escaping high pressure oil

working with hot fluid hazards

environmental requirements, including procedures for trapping, storing and disposing of hydraulic fluid released from hydraulic systems.

Repairs must include:

using pressure gauges and flow meters to set system pressure settings and adjust hydraulic valves.


Performance Evidence

Before competency can be determined, individuals must demonstrate they can perform the following according to the standard defined in this unit’s elements, performance criteria, range of conditions and foundation skills:

diagnose and repair a fault in the hydraulic systems of two different mobile plant or agricultural machinery, and:

remove, refit or replace two different types of hydraulic valves

remove, refit or replace one hydraulic cylinder

in the course of the above work, undertake two the following:

rebuild hydraulic cylinder

rebuild motor or pump

remove, refit or replace hose

remove, refit or replace pump

remove, refit or replace motor

remove, refit or replace accumulator.


Knowledge Evidence

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 mobile plant hydraulic systems, including procedures for:

using raising, lowering and supporting equipment

isolating and stabilising machines

working with stored hydraulic pressure

working with escaping high pressure oil

working with hot fluid hazards

environmental requirements, including procedures for trapping, storing and disposing of hydraulic fluid released from hydraulic systems

AS 1101.1 Graphic symbols for general engineering, Part 1: Hydraulic and pneumatic systems

operating principles of hydraulic systems and associated components, including:

transmission of energy by hydraulic fluid

mechanical advantage

hydraulic circuits, including open and closed centred systems

temperature, force, pressure, area and flow

application, purpose and operation of hydraulic systems and components, including:

reservoirs

gas loaded accumulators

pumps, including gear and piston

valves, including:

directional control, including valve banks

pressure control, including spike or circuit protection valving

flow control, including meter in and meter out

linear and rotary actuators

hoses, pipes fittings and couplings

heat exchangers

hydraulic fluids

hydraulic system schematics

diagnostic testing procedures for hydraulic systems, including:

applying and using a flow meter to diagnose faults by carrying out an in-line, bypass or ‘Tee’ test to evaluate system components

visually inspecting hoses, pipes and connectors

oil sampling and contamination control

repair procedures for hydraulic systems, including procedures for removing, replacing, repairing and adjusting hydraulic system components

post-repair testing procedures for hydraulic systems, including:

operational functionality

flow testing.