Back to Critical Work Functions Click here for AEKS Matrix
Occupational Title: Heavy Equipment Maintenance Technician
Key Purpose: Diagnose, service and repair heavy equipment
Critical Work Function
8 Diagnose, service, and repair vehicle power-drive
 train 		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
  8.1 		Diagnose, service, and repair clutch and retarder systems.
Number
Criteria
8.1.1 Diagnose, service, repair, and adjust coupling devices.
8.1.2 Diagnose, service, repair, and adjust coupling system and components.
8.1.3 Diagnose, service, repair, and adjust hydraulic retarder operating controls and components.
8.1.4 Post-service vehicle performance indicates system components performing at or above OEM specifications.
Understanding of engine-coupling system operation and theory

Knowledge of engine-coupling parts, controls, and components

Understanding of hydraulic retarder operation and theory

Knowledge of hydraulic retarder parts, controls, and components

Knowledge and application of monitoring systems

Knowledge and ability to read hydraulic schematics

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

Common mechanic's hand tools

Transmission/clutch dolly

Clutch alignment tools

Appropriate shop service manuals and other documentation

Appropriate service tools and testing equipment


KA   8.2 Diagnose, service, and repair transmission.
Number
Criteria
8.2.1 Diagnose, service, and repair standard transmission.
8.2.2 Inspect, repair, and adjust standard transmission operating controls and linkage.
8.2.3 Inspect, repair, and adjust automatic/power-shift transmission operating controls and linkage.
8.2.4 Remove and install/replace transmission and related components.
8.2.5 Diagnose, service, and repair automatic/power-shift transmission.
8.2.6 Post-service performance indicates system components performing at or above OEM specifications.
Knowledge of transmission parts, controls, and components

Understanding of transmission operation and theory

Knowledge and application of appropriate gauge sets

Knowledge and usage of PC and OEM diagnostic tools

Knowledge and ability to read schematics

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

KA
 8.3 		Diagnose, service, and repair drive shafts.
Number
Criteria
8.3.1 Phase and check drive-line components.
8.3.2 Replace universal joints and center support bearings.
8.3.3 Diagnose drive shaft, universal joint, and vibration problems and determine needed  repairs.
8.3.4 Post-service performance indicates system components performing at or above OEM specifications.
Knowledge and understanding of drive-line parts and components and their purpose

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

Common mechanic's hand tools

Appropriate service tools and testing equipment

Appropriate shop service manuals and other documentation

KA 8.4 Diagnose, service, and repair final drives.
Number
Criteria
8.4.1 Remove and install/repair or replace differential/final drive assembly.
8.4.2 Diagnose, service, and repair differential/final drive assembly.
8.4.3 Diagnose noise and overheating problems and determine needed repairs.
8.4.4 Remove, install/replace, and inspect axle shafts and wheel assembly.
8.4.5 Remove, inspect, install/replace, and adjust wheel bearings.
8.4.6 Remove and install/replace wear rings and seals.
8.4.7 Remove, clean, inspect/replace, and service final drive oil coolers, lines, and filters.
8.4.8 Install/replace planetary gear sets.
8.4.9 Post-service performance indicates system components performing at or above OEM specifications.
Knowledge of types of final drives and related components

Knowledge of final drive manufacturer's model, type, and axle ratio

Knowledge and application of appropriate measuring instruments

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

Common mechanic's hand tools

Appropriate service tools and testing equipment

Appropriate shop service manuals and other documentation

KA
 8.5 		Diagnose, service, and repair miscellaneous gear and gear-reduction boxes.
Number
Criteria
8.5.1 Calculate gear ratio.
8.5.2 Diagnose, service, and repair gear or gear-reduction box.
8.5.3 Remove and install/replace gear or gear-reduction box.
8.5.4 Post-service performance indicates that components are performing at or above OEM specifications.
Knowledge of different types of gear and gear-reduction boxes and their use

Knowledge of gear and gear-reduction box parts and components

Knowledge and application of appropriate measuring and testing instruments

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

Common mechanic's hand tools

Appropriate service tools and testing equipment.

Appropriate shop service manuals and other documentation

Dial indicator

Depth micrometer

KA
 8.6 		Diagnose, service, and repair chain/belt-type drive.
Number
Criteria
8.6.1 Remove, install/replace, and adjust chain.
8.6.2 Diagnose, service, and repair chain-drive components and parts.
8.6.3
 		Remove, install/replace, and adjust drive belts.
8.6.4
 		Diagnose, service, and repair belt-drive system components and parts.
8.6.5
 		Post-service performance indicates that all components are performing at or above OEM specifications.
Knowledge and understanding of chain/belt-type drive components and parts

Knowledge and application of appropriate gauges

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

Common mechanic's hand tools

Appropriate service tools and testing equipment

Appropriate shop service manuals and other documentation

KA
 8.7 		Diagnose, service, and repair track-drive system.
Number
Criteria
8.7.1 Identify, adjust, and measure under-carriage wear patterns.
8.7.2 Remove, install/replace, and align track components.
8.7.3 Install/replace, and adjust track-drive controls.
8.7.4
 		Perform required periodic maintenance on track-drive system.
8.7.5
 		Post-service performance indicates that components are performing at or above OEM specifications.
KKnowledge of track-drive system components and parts and their function (track rollers, idlers, sprockets)

Understanding of how a track-drive system works and wears

Knowledge and application of appropriate measuring and testing instruments

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

Common mechanic's hand tools

Appropriate service tools and testing equipment

Appropriate shop service manuals and other documentation