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Occupational Title: Heavy Equipment Maintenance Technician
Key Purpose: Diagnose, service and repair heavy equipment
Critical Work Function
6 Diagnose, service, and repair vehicle fuel and ignition systems 		Occupational Skills, Knowledge and Conditions
Key Activities
Performance Criteria
Occupational Skills and Knowledge
Conditions
Those duties or task clusters that are necessary to perform each critical work function.
Specific demonstrable performance and standards that indicate when the key activity has been performed successfully.
Those skills and knowledge that are specific to the occupation, such as technical processes or procedures common across the occupation that are critical to the related key activity.
Tools, resources and equipment necessary to carry out key activities and their related performance criteria.




KA
 6.1 		Diagnose and repair diesel fuel systems.
Number
Criteria
6.1.1 Perform pop test of conventional diesel-style injector and evaluate the performance.
6.1.2 Inspect and test diesel-fuel injector.
6.1.3 Remove, install/replace, and time diesel-fuel injection pump.
6.1.4 Disassemble, inspect, repair, reassemble, and test diesel-fuel injection pump.
6.1.5 Replace diesel-fuel filters.
6.1.6 Remove, repair, and install/replace diesel-fuel lines and hoses.
6.1.7 Remove and install/replace diesel injectors.
6.1.8 Inspect, test, and replace electronic fuel system control components.
6.1.9 Post-service performance indicates system components performing at or above OEM specifications.
Knowledge of diesel-fuel system components and parts and their function

Knowledge of and ability to read schematics and diagrams

Knowledge of PC usage and OEM diagnostic software

Knowledge and usage of shop manuals and other appropriate documentation 		Using the following tools, resources, and equipment:

Personal/laptop computer

Diagnostic software

Common mechanic's hand tools

Appropriate service tools and testing equipment

Appropriate shop service manuals and other documentation 

KA   6.2 Diagnose and repair alternate fuel metering devices.
Number
Criteria
6.2.1 Diagnose no-starting, hard-starting, poor idle, flooding, hesitation, surging, engine misfire, excessive emissions, power loss, poor mileage, and/or dieseling problems on vehicle with alternate-fuel metering systems.
6.2.2 Adjust fuel metering system.
6.2.3 Check fuel quality and condition.
6.2.4 Inspect and test (pressure, vacuum, and volume) fuel pumps and pump controls (electrical/electronic).
6.2.5 Inspect, clean, adjust, and test cold-enrichment systems.
6.2.6 Remove, repair, and install carburetor/fuel injection throttle body and adjust related linkages.
6.2.7 Rebuild and adjust fuel-metering system (includes disassembling, cleaning, replacing faulty parts, and reassembly).
6.2.8 Inspect and clean carburetor mounting plates, fuel injection air induction system, intake manifold, and gaskets.
6.2.9 Adjust carburetor idle speed and fuel mixture.
6.2.10 Inspect, test, and clean fuel injection system components.
6.2.11 Post-service performance indicates system components performing at or above OEM specifications.
Knowledge of alternate fuel- and exhaust-system components and parts, and their function

Knowledge and usage of PC computers and OEM diagnostic tools

Knowledge and application of appropriate testers and gauges

Knowledge and usage of shop manuals and other appropriate documentation
Using the following tools, resources, and equipment:

Personal/laptop computer

Diagnostic software

Appropriate service tools and testing equipment

Common mechanic's hand tools

Electronic fuel injection tester

Vacuum gauge

Appropriate shop service manuals and other documentation

Appropriate carburetor adjustment tools

KA
 6.3 		Diagnose and repair emissions control systems.
Number
Criteria
6.3.1 Inspect and test the positive crankcase ventilation (PCV) systems.
6.3.2 Test and inspect exhaust gas recirculation (EGR) system.
6.3.3 Test and inspect the air-injection reaction (AIR) system.
6.3.4 Test and inspect fuel vapor control system.
6.3.5 Inspect and test inlet air-temperature control system.
6.3.6 Post-service performance indicates components performing at or above OEM specifications.
Knowledge of vehicle fuel- and ignition-systems components and parts and their function

Knowledge of PC usage and OEM diagnostic software

Usage of appropriate diagnostic tools.

Understanding of exhaust gas recirculation system and components (manifolds, controls, and passages)

Understanding of air-injection reaction system and components (pumps, valves, controls, manifolds, and injectors)

Understanding of fuel-vapor control system and components (liquid/vapor separator, valves, filters, and controls)

Understanding of inlet air-temperature control system and components (early fuel evaporator, sensors, heat shrouds, and damper)

Knowledge and usage of shop manuals and other appropriate documentation 		Using the following tools, resources, and equipment:

Personal/laptop computer

OEM diagnostic software

Common mechanic's hand tools

Appropriate service tools and testing equipment

Appropriate shop service manuals and other documentation