Specific Competencies and Skills Tested in this Assessment:
Safety
- Demonstrate understanding of fire safety
- Demonstrate understanding of personal, environmental, and equipment safety
Shop Practices, Tools, and Equipment
- Perform precision measuring (e.g., micrometers)
- Identify and select lines and fittings
- Identify, select, and use hand tools
- Identify, select, and use hand tools basic shop equipment
- Identify and select proper fasteners
- Access technical information
Diesel Engines
- Display knowledge of diesel technology terminology
- Display understanding of exhaust and induction systems
- Identify components and functions of cooling systems
- Display understanding of engine electronics
- Identify components and functions of lubricating systems
- Identify components and functions of fuel systems
- Display knowledge of diesel engine component parts and diesel engine operation
Suspension and Steering
- Identify, maintain, and inspect TPMS and wheels
- Identify and repair chassis components
- Identify, maintain, and repair power steering systems
- Identify, maintain, and repair steering axle components
- Identify, maintain, and repair suspension types (i.e., front, rear)
- Maintain proper vehicle alignment
Brakes
- Identify, inspect, and repair hydraulic foundation brake system components and functions
- Identify and inspect ABS, ATC, and VSS
- Identify, inspect, and repair air foundation brake system components and functions
- Identify and inspect supply system components
- Identify, inspect, and repair air system components
Electrical and Electronic Systems
- Apply understanding of basic electrical principles
- Demonstrate knowledge of electrical schematics
- Service and inspect batteries
- Diagnose and repair starting systems
- Diagnose and repair lighting systems
- Diagnose and repair charging systems
Drivetrains
- Demonstrate understanding of the types of clutches
- Demonstrate understanding of transmissions (i.e., manual, automatic)
- Install and replace U-joints, and interpret drive line angles
- Diagnose and display understanding of differentials functionality, including interaxles
Preventive Maintenance
- Perform troubleshooting and preventive maintenance on engine systems
- Perform troubleshooting and preventive maintenance on transmissions (i.e., manual, automatic)
- Perform troubleshooting and preventive maintenance on cooling systems
- Perform troubleshooting and preventive maintenance on brake systems
- Perform troubleshooting and preventive maintenance on frame and chassis
- Perform troubleshooting and preventive maintenance on HVAC systems
- Perform troubleshooting and preventive maintenance through inspection of tire wear patterns
- Perform troubleshooting and preventive maintenance on clutches
Written Assessment:
Administration Time: 3 hours
Number of Questions: 179
Areas Covered:
Safety: 8%
Shop Practice, Tools, and Equipment: 12%
Diesel Engines: 13%
Suspension and Steering: 11%
Brakes: 13%
Electrical and Electronic Systems: 14%
Drivetrains: 10%
Preventive Maintenance: 19%
Sample Questions:
To avoid burns, use caution when opening the
- radiator cap
- gas cap
- brake fluid reservoir
- washer reservoir
A torque angle meter is used to properly tighten the bolts of a/an
- cylinder head
- motor mount
- valve cover
- oil pan
In oil coolers, the hot oil transfers its heat
- directly to the coolant
- to stabilize coolant temperature
- only in very hot climates
- under heavy load conditions
The downward bend of a frame is known as
- bow
- diamond
- sideways
- sag
The purpose of the ABS sensor is to
- measure air pressure
- measure break temperature
- create AC pulses
- create DC pulses
A conventional battery might require adding distilled water because of evaporation or
- overcharging
- high RPM
- low amperage
- excessive idling
When replacing a heavy-duty clutch
- pre-lube the friction material before installation
- replace the clutch disc(s), pressure plate, and pilot bearing
- reuse the clutch brake
- grease the old bearings
Performance Assessment:
Administration Time: 2 hours, 45 minutes
Number of Jobs: 65
Areas Covered:
17% Cylinder Liner Installation
Participant will follow procedures for measurements for the installation of a cylinder liner and record results.
23% Perform a Wheel Bearing Adjustment and Brake Stroke Measurement
Participant will adjust wheel bearings according to Technical and Maintenance Council guidelines and measure and record brake stroke.
14% Check and Adjust Rocker Level Clearance
Participant will check and adjust rocker lever clearance in the engine provided.
11% Perform a Coolant System Inspection
Participant will pressure test an engine cooling system, test a coolant sample, and record findings.
23% Electrical Testing
Participant will perform a battery discharge test, starter draw test, and alternator output test using the appropriate test meters.
12% Diesel Engine Performance Trouble Codes
Participant will identify trouble codes and give descriptions, use service information to identify and locate components related to the trouble codes, inform evaluator of findings, and leave codes when finished.
Sample Job:
Perform a Coolant System Inspection
Maximum Time: 30 minutes
Participant Activity: The participant will pressure test the engine cooling system, record the test pressure, pressure test the pressure cap and serviceability, record maximum pressure, perform SCA test on coolant sample, and determine the freeze point of the
sample.