Diesel Medium and Heavy Truck Technician Technical Diploma

Program Code: 314128

The Diesel Medium and Heavy Truck Technician program prepares students for entry-level employment as a diesel truck technician working in over-the-road truck fleet maintenance, dealership service, or repair shop service. This four-semester technical diploma will focus on basic skills and knowledge in diesel engines, diesel fuel systems, truck brakes and chassis, steering and suspension, climate control, hydraulic applications, electronic technology, transport refrigeration, and truck preventive maintenance.

Follow Your Path

All credits from this technical diploma apply toward the following associate degree(s):
• Students completing this technical diploma may also earn the Diesel Medium and Heavy Truck Technology associate degree (104123) after completing four additional courses.


Employment Potential

• Diesel Mechanic

• Diesel Technician

• Fleet Mechanic

• Diesel Sales

• Diesel Parts Technician

With additional education and/or work experience, graduates may find other opportunities for employment.

• Diesel Shop Service Writer
• Shop Foreperson
• Parts Manager
• Service Manager
• Factory Representative


Requirements for Program Entry

• Completed application.
• High school transcript or equivalent. (For a list of equivalents, go to
• High school background in math, science and technology education would be beneficial.
• To be admitted to this program, learners must achieve a prior cumulative high school or college grade point average of 2.6 or higher OR a satisfactory academic skills assessment score. College grade point average must be based on 15 credits or more. To learn more about starting this program, please contact an academic advisor at (920) 498-5444 or (888) 385-6982.

Program Availability

FULL TIME Spring 2021 Summer 2021 Fall 2021
Green Bay --- ---
Marinette --- ---
Sturgeon Bay --- ---
Students following the study plan below will complete the Diesel Medium and Heavy Truck Technician technical diploma in the number of semesters shown.
10-890-101 COLLEGE 101 ...Students will utilize digital tools and resources to assess, explore, practice, apply, and evaluate both employability and learning skills. By establishing NWTC cultural values as hallmarks of success in academic, career, and personal settings the course encourages reflective, personalized development of a growth mindset and emphasizes the importance of making wise choices. To maximize the return on investment, students should take this course in their first semester as it identifies key expectations (hidden rules) of higher learning and professional employment.
10-804-134 MATHEMATICAL REASONING ...This course provides an alternative pathway to earning credit for a college level liberal arts mathematics course. All college students, regardless of their college major, need to be able to make reasonable decisions about fiscal, environmental, and health issues that require quantitative reasoning skills. An activity based approach is used to explore numerical relationships, graphs, proportional relationships, algebraic reasoning, and problem solving using linear, exponential and other mathematical models. Students will develop conceptual and procedural tools that support the use of key mathematical concepts in a variety of contexts. This course is not designed for Science, Technology, Engineering, or Math (STEM) students and/or others who require calculus. (Prerequisite: Next Gen Arith score greater/equal to 250 AND Rdg score greater/equal to 250; OR TABE A 9/10 Math greater/equal to 12.7 AND Rdg greater/equal to 8.8; OR TABE 11/12 Math greater/equal to 780 AND Rdg greater/equal to 567; OR ACT Math score greater/equal to 15 AND ACT Reading score greater/equal to 16; OR prep courses-contact an academic advisor 920-498-5444)
10-412-125 TRANSPORTATION SERVICE OPERATIONS ...introduces the auto and diesel shop environment, safety and the use of basic hand/power tools in accordance with industry standards, use of manufacturer's service information and literature, handling hazardous materials, and emphasizes general shop safety and general shop practices.
10-412-100 DIESEL LAB OPERATIONS ...diesel shop safety, basic equipment operation, rigging and lifting, hand and power precision tools, fasteners and hazard material handling procedures.
10-412-151 INTRO TO DIESEL MECHANICS ...introduces the student to the tools and equipment used in a heavy duty diesel shop, diesel shop work orders, vehicle classifications, fasteners and repair hardware, rigging and lifting, and basic diesel shop equipment operation. (Corequisite: 10-412-150, Intro to Service Fundamentals)
10-412-170 WELDING TRANSPORTATION 1 ...focuses on welding and cutting safety; develops skills in welding and cutting of metals used in the transportation trades. Methods of welding include gas metal arc welding (MIG) in the horizontal, vertical, and overhead positions. Methods of cutting include oxy-fuel and plasma arc cutting of metals. Students will learn to set up and maintain welding equipment and weld and cut a variety of types and thicknesses of materials commonly used in the transportation trades.
10-412-171 TRANSPORTATION WELDING 2 ...This course provides the opportunity for the learner to develop the knowledge, skills, process, and understanding of GMAW (MIG) welding equipment set-up, use, and maintenance and GMAW (MIG) welding on various thicknesses of steel in the flat, vertical, horizontal, and overhead position. (Corequisite: 10-412-170, Transportation Welding 1)
10-412-153 INTRO TO ELECTRICAL SYSTEMS ...focus on the theory of electricity. This will include studying Ohms, Kirchoff's, and Newton's Laws and how they apply to the circuits on various electrical systems on a vehicle. Students will apply these theories to troubleshoot simple circuits.
10-412-154 DIESEL HEAVY DUTY ELECTRICAL 1 ...focuses on the fundamentals of electricity, batteries starting circuits, charging circuits, and electrical circuits found on trucks and tractors. Covers testing and troubleshooting procedures for various systems presently used in the industry, as well as how to perform repairs. (Corequisite: 10-412-153, Intro to Electrical Systems)
10-412-152 SCHEMATIC INTERPRETATION ...electronic/hydraulic schematics, applications of schematics, system similarities, components, review of systems operation, practical applications in diagnosing system problems, use of special test equipment/schematics to solve problems.
10-412-155 DIESEL HEAVY DUTY ELECTRICAL 2 ...focuses on troubleshooting and diagnostics of electrical systems used on heavy duty vehicles. Students will diagnose and repair electronic engines, transmissions and ABS systems. Wiring schematic reading and wiring harness repair will be covered. (Corequisite: 10-412-155, Diesel Heavy Duty Electrical 1)
10-412-156 HYDRAULIC/PNEUMATIC SYSTEMS ...covers but is not limited to hydraulics principles, system schematics and symbols, pumps, valves, cylinders, motors, accumulators, filters, reservoirs, hydraulic seals, fluids, maintenance, and safety rules. (Prerequisites: 10-412-100, Diesel Lab Operations; Co-requisite: 10-412-152, Schematic Interpretation)
10-412-157 HEATING VENTILATION & AIR CONDITIONING ...develops skills required to service commercial vehicle heating, ventilation and air conditioning systems. Students practice proper procedures for handling R134A Freon and for servicing HFC 134A systems. Students will be prepared to take the Federal 609 Certification test. (Prerequisites: 10-412-100, Diesel Lab Operations; Corequisite: 10-412-154, Diesel Heavy Duty Electrical 1; 10-412-152, Schematic Interpretation)
10-412-158 CHASSIS SUB-SYSTEMS ...focus on the sub system of various OEM chassis including compressed air for brakes, avoidance collision system, and chassis configurations. Students will use OEM software to obtain OEM specifications for each sub system. (Prerequisites: 10-412-100, Diesel Lab Operations; Corequisite: 10-412-154, Diesel Heavy Duty Electrical 1; 10-412-152, Schematic Interpretation)
10-412-159 ENGINE SUB-SYSTEMS ...focus on the sub system of the various OEM engine to include air intake, exhaust system, cooling and oil system. Students will work with OEM literature for follow flow and diagnostic procedures for each system. (Corequisite: 10-412-158, Chassis Sub-Systems)
10-412-160 DIESEL ELECTRONIC MANAGEMENT ...focuses on electronic computer controlled engine management system function, component identification and computer-based diagnostic tool operation. Lab demonstrations cover component identification, function and testing of the engine management systems. Introduction to proper operation and use of electronic testing with the use of a digital volt ohm meter. (Prerequisite: 10-412-158, Chassis Sub-Systems)
10-412-161 ENGINE TUNE-UP ...focuses on engine tune up to optimize fuel mileage and performance of the engine. Students will perform an engine tune up on various engines following the OEM procedures utilizing specialty tools and equipment. (Prerequisite: 10-412-158, Chassis Sub-Systems)
10-412-162 ENGINE PERFORMANCE ...focuses on key performance and troubleshooting skills and methodology. Student will be using OEM testing and troubleshooting process to ensure the engine functioning to OEM specs. Computer based diagnostic tools will be uses on trucks during road test situations. (Prerequisite: 10-412-158, Chassis Sub-Systems)
10-412-163 DIESEL ENGINE REBUILDING ...students will disassemble, identify each part of a modern diesel engine, measure all wear points and make reuse recommendations. Students will also reassemble an electronic controlled diesel engine. Covers component analysis, function and operation theories of the diesel engine. (Prerequisite: 10-412-158, Chassis Sub-Systems)
10-412-164 DIESEL STEERING & SUSPENSION ...focuses on heavy-duty truck suspensions and steering systems. Students will learn about the operation, maintenance and overhaul of various types of heavy-duty suspensions. Provides technicians with the opportunity to perform total vehicle alignments. Also covers testing and troubleshooting of power steering systems and steering complaints. (Prerequisites: 10-412-158, Chassis Sub-Systems; 10-412-156, Hydraulic/Pneumatic Systems)
10-412-165 TRANSMISSION AND CLUTCHES ...covers procedures for overhauling, adjusting and troubleshooting heavy-duty transmission, clutches and various final drives found on over-the-road trucks and tractors. Students will work on modern manual and automated transmission and use skills to diagnose and repair transmission. (Prerequisite: 10-412-158, Chassis Sub-Systems)
10-412-166 DIFFERENTIAL AND DRIVELINE ...focuses on the operation and maintenance of the power train. Students will learn how the power flows through the differential and power divider. Covers calculation of the change driveline angles. (Prerequisite: 10-412-158, Chassis Sub-Systems)
10-412-167 DIESEL HEAVY DUTY BRAKE SYSTEMS ...Focuses on the air brake system component operation and maintenance for trucks and tractor/trailers. Students will learn to perform overhaul procedures for cam, wedge and disc air operated foundation brakes, as well as heavy-duty hydraulic brakes. It provides the opportunity for students to test and troubleshoot the entire air and hydraulic brake systems, including ABS systems found in trucks. (Prerequisite: 10-412-158, Chassis Sub-Systems)
10-412-168 DIESEL TRUCK PREVENTATIVE MAINTENANCE...focuses on the techniques for performing preventive maintenance and DOT criteria for performing annual inspections. Discussion includes the importance of vehicle maintenance and inspections. Students learn record-keeping requirements and earn an annual inspection certificate upon successful completion of the test at the conclusion of the class. (Prerequisites: 10-412-158, Chassis Sub-Systems; Corequisite: 10-412-164, Diesel Steering & Suspension, 10-412-165, Transmission and Clutches, 10-412-166, Differential and Driveline, 10-412-167, Diesel Heavy Duty Brake Systems)
10-458-100 CDL LICENSE TRAINING ...this course is designed to prepare students for the Wisconsin Class A Commercial Drivers License (CDL) pre-trip inspection, air brake and skills test. Preparation will also be given for taking the State DOT written test including general knowledge, air brakes and combination vehicles.
Curriculum Note
. The credit for 10-890-101, College 101, is an institutional Requirement for graduation. Consequently, it is not part of the program credit requirements, but must be passed with a C or better.

Program Outcomes

• Diagnose major systems in the diesel truck industry.
• Repair major systems in the diesel truck industry.
• Service major systems in the diesel truck industry.
• Practice personal and professional work habits.
• Document complaint, cause and correction.


Study Abroad Opportunities

The International Programs staff continually seeks opportunities for students to travel abroad for educational experiences that may be offered in association with program courses. To find out more about which of your program courses may offer an opportunity during this academic year, contact your academic advisor or visit