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Occupational Title: Heavy Equipment Maintenance Technician
Key Purpose: Diagnose, service and repair heavy equipment
Critical Work Function
4 Diagnose, service, and repair vehicle hydraulic
 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 4.1 Diagnose, service, and repair mobile hydraulic systems.
Number
Criteria
4.1.1 Perform hydraulic system performance test.
4.1.2 Inspect, remove, repair, and install/replace hoses, lines, fittings, and couplings.
4.1.3 Perform OEM-required maintenance on hydraulic system.
4.1.4 Test, remove, repair, and install/replace hydraulic cylinder.
4.1.5 Test, remove, repair, and install/replace hydraulic pump.
4.1.6 Test, remove, repair, and install/replace hydraulic motor.
4.1.7 Test, remove, repair, and install/replace pressure, flow, and directional control     valves.
4.1.8 Remove, repair, and replace oil cooler.
4.1.9 Check hydraulic system temperature and determine needed repairs.
4.1.10 Flush and clean hydraulic system
4.1.11 Charge hydraulic system accumulator.
4.1.12 Test, remove, and/or replace electrical control wiring, switches, solenoids, and connectors.
4.1.13 Post service vehicle performance indicates that components performing at or above OEM specifications.
Knowledge and understanding of mobile hydraulic system

Knowledge of various types of hydraulic systems found on mobile equipment

Knowledge of components and parts used in mobile hydraulic systems and their purpose (hydraulic spool valves, flow divider valves, relief valves, pressure-reducing valves, sequencing valves, unloading valves, and hydraulic controls)

Knowledge of PC usage and OEM diagnostic software

Knowledge of and ability to interpret hydraulic symbols, schematics, and diagrams.

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

Hydraulic test gauge and fittings

Appropriate shop service manuals and other documentation

KA 4.2
 		Diagnose, service, and repair hydrostatic drive.
Number
Criteria
4.2.1 Perform hydrostatic drive performance test and determine needed repair.
4.2.2 Perform OEM-required maintenance on hydrostatic drive unit.
4.2.3 Inspect, remove, repair and install/replace hoses, lines, fittings, and couplings.
4.2.4 Test, remove, repair, and install/replace hydrostatic drive components.
4.2.5 Check, adjust, remove, repair, and install/replace hydrostatic drive control.
4.2.6
 		Post-service vehicle performance indicates that components performing at or above OEM specifications.
Knowledge of PC usage and OEM diagnostic software.

Knowledge of and ability to interpret hydraulic symbols, schematics, and diagrams

Knowledge of various types of hydraulic hoses, lines, and fittings

Understanding of hydrostatic drive-system components and parts and their function

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

Personal/laptop computer

Diagnostic software

Appropriate service tools and equipment

Common mechanic's hand tools
 
Appropriate shop service manuals and other