NewDiesel Mechanic United RentalsDiesel MechanicGlenwood, IL$31–$53 / hourAs a Diesel Mechanic - Experienced (Service Tech IV), you'll use your skills to perform maintenance and repairs of complex equipment with limited or no supervision in a highly skilled, safe, and professional manner. Maintenance and repair of complex mechanical, electrical, hydraulic, and diesel systems on a variety of rental and customer equipment and tools while using a high degree of independent judgment.
Diesel Technician/Mechanic III - Entry Level PenskeDiesel Technician/Mechanic III - Entry LevelChannahon, ILFull timeWillingness to work the required schedule, work at the specific location required, complete Penske employment application, submit to a background screening (to include criminal checks, past employment and education), the ability to pass a drug screen and physical as required by the Department of Transportation, and potential travel within a near geography for training are required. • Doing preventative maintenance repairs—like replacing or rotating tires—and completing vehicle component lubrication and replacement, some electrical system repairs, and cooling system maintenance on gas and diesel engine vehicles.
Diesel Technician SchneiderDiesel TechnicianGary, INThis diversity and openness ensures all associates have equal access to opportunities and resources to contribute fully to the organization's success, and it fuels innovation, improves strategic thinking and cultivates leadership. Non-exempt U.S. shop associates working weekend hours, receive an additional $0.65 per hour differential for hours worked.
NewMaintenance Technician II Summit School ServicesMaintenance Technician IICarol Stream, ILYou’ll work across yellow-bus systems—preventive maintenance, air and hydraulic braking, steering/suspension, electrical/charging, HVAC, drivetrains/transmissions, and DVIR/state inspection readiness—balancing quality repairs with uptime so routes leave on time. • Diagnose and repair automotive and diesel systems — including brakes, steering, suspension, drivetrains, electrical, cooling, and fuel systems — according to skill level.
2nd Shift Diesel Mechanic Waste Connections Inc2nd Shift Diesel MechanicAurora, ILTo excel in this 2nd shift diesel mechanic role, you should bring: • Hands-on experience with diesel truck diagnostics, preventive maintenance, and repairs • Hydraulic system experience (preferred but not required) • Ability to work in all weather conditions • Ability to lift at least 50lbs repeatedly. In this role, you'll perform essential fleet maintenance and diesel truck repair to keep our drivers safe and our operations running smoothly.
Diesel Mechanic/Technician (2001) Kooner Fleet Management SolutionsDiesel Mechanic/Technician (2001)Romeoville, ILWith nearly a decade of industry experience, Kooner FMS helps fleets reduce downtime, extend vehicle life, and simplify operations through proactive maintenance programs and advanced technology. Backed by a supportive team that values your skill, drive and dedication, you’ll tackle new challenges every day and take pride in delivering safe, reliable and efficient service that keeps America moving.
Diesel Mechanic/Technician Swift Transportation Co LLCDiesel Mechanic/TechnicianChicago, IL$24–$33 / hourWe're one of the biggest fleets on the road and we make our presence known, with more than 13,000 trucks, 60,000 trailers, 12,000 company drivers, and over 700 Fleet Technicians. Complete a quality preventative maintenance inspection and repairs on all company owned equipment, to include tractors, trailers, refrigerated units and support equipment.
Mobile Diesel Mechanic/Technician (2027) Kooner Fleet Management SolutionsMobile Diesel Mechanic/Technician (2027)Joliet, ILp>Geared up with your own, fully equipped company service truck, top-tier tools, and a supportive team that values your skill, drive and dedication, you’ll tackle new challenges every day and take pride in delivering safe, reliable and efficient service that keeps America moving. With nearly a decade of industry experience, Kooner FMS helps fleets reduce downtime, extend vehicle life, and simplify operations through proactive maintenance programs and advanced technology.
Mobile Diesel Mechanic/Technician (1996) Kooner Fleet Management SolutionsMobile Diesel Mechanic/Technician (1996)Chicago, ILp>Geared up with your own, fully equipped company service truck, top-tier tools, and a supportive team that values your skill, drive and dedication, you’ll tackle new challenges every day and take pride in delivering safe, reliable and efficient service that keeps America moving. With nearly a decade of industry experience, Kooner FMS helps fleets reduce downtime, extend vehicle life, and simplify operations through proactive maintenance programs and advanced technology.
Diesel Mechanic (CNG) Great Pay & Benefits! Waste Management IncDiesel Mechanic (CNG) Great Pay & Benefits!Matteson, IL$26.97–$40.46 / hourRequired to be exposed to physical occupational risks (such as cuts, burns, exposure to toxic chemicals, etc.) often; Required to be exposed to physical environment which involves dirt, odors, noise, weather extremes or similar elements often; This job operates in both inside garage, shop or gas plant conditions as well as in outside conditions that include inclement weather, heat and humidity. WM has the largest disposal network and collection fleet in North America, is the largest recycler of post‑consumer materials and is a leader in beneficial use of landfill gas, with a growing network of renewable natural gas plants and the most landfill gas‑to‑electricity plants in North America.
Sr. Diesel Mechanic PTO & Immediate Healthcare! Waste Management IncSr. Diesel Mechanic PTO & Immediate Healthcare!Melrose Park, IL$30.31–$45.49 / hourRequired to be exposed to physical occupational risks (such as cuts, burns, exposure to toxic chemicals, etc.) often; Required to be exposed to physical environment which involves dirt, odors, noise, weather extremes or similar elements often; This job operates in both inside garage, shop or gas plant conditions as well as in outside conditions that include inclement weather, heat and humidity. WM has the largest disposal network and collection fleet in North America, is the largest recycler of post‑consumer materials and is a leader in beneficial use of landfill gas, with a growing network of renewable natural gas plants and the most landfill gas‑to‑electricity plants in North America.
Diesel Mechanic 2nd Shift Employee Advancement Opportunities! Waste Management IncDiesel Mechanic 2nd Shift Employee Advancement Opportunities!IL$26.97–$40.46 / hourRequired to be exposed to physical occupational risks (such as cuts, burns, exposure to toxic chemicals, etc.) often; Required to be exposed to physical environment which involves dirt, odors, noise, weather extremes or similar elements often; This job operates in both inside garage, shop or gas plant conditions as well as in outside conditions that include inclement weather, heat and humidity. WM has the largest disposal network and collection fleet in North America, is the largest recycler of post‑consumer materials and is a leader in beneficial use of landfill gas, with a growing network of renewable natural gas plants and the most landfill gas‑to‑electricity plants in North America.
Experience Diesel Mechanic Swift Transportation Co LLCExperience Diesel MechanicGary, IN$23–$30 / hourWe're one of the biggest fleets on the road and we make our presence known, with more than 13,000 trucks, 60,000 trailers, 12,000 company drivers, and over 700 Fleet Technicians. Complete a quality preventative maintenance inspection and repairs on all company owned equipment, to include tractors, trailers, refrigerated units and support equipment.
Diesel Mechanic Trainee Entry Level RyderDiesel Mechanic Trainee Entry LevelRomeoville, Illinoisli>Attend and complete all Technician Training Development Program requirements and assessments; training will include hands-on and online training as well as performing tasks learned; Technician Training Development Program will include but is not limited to: Service Island Training: Service island multi-point inspection (includes hand held). Perform multi-point inspection on inbound units as required by company policies and procedures; this includes checking vehicle tire pressure and thread, fluid levels, lights, washing vehicle windows, changing tires, inspecting refrigeration units on trucks, and reporting service or driver issues to shop.
Diesel Mechanic Amerit Fleet SolutionsDiesel MechanicAurora, Illinois$22–$44 / hourFull timeTechnicians must be able to perform essential functions that include lifting heavy objects, accessing tight spaces, and bending, stooping, crouching, or crawling as needed to complete repairs. This role involves working in a mobile and or shop environment that may include exposure to dust, diesel fumes, noise, and mechanical irritants such as oils and greases.
Diesel Mechanic 2nd Shift PTO & Benefits! Waste Management IncDiesel Mechanic 2nd Shift PTO & Benefits!Cicero, IL$26.97–$40.46 / hourRequired to be exposed to physical occupational risks (such as cuts, burns, exposure to toxic chemicals, etc.) often; Required to be exposed to physical environment which involves dirt, odors, noise, weather extremes or similar elements often; This job operates in both inside garage, shop or gas plant conditions as well as in outside conditions that include inclement weather, heat and humidity. WM has the largest disposal network and collection fleet in North America, is the largest recycler of post‑consumer materials and is a leader in beneficial use of landfill gas, with a growing network of renewable natural gas plants and the most landfill gas‑to‑electricity plants in North America.
Sr Diesel Mechanic PTO & Benefits! Waste Management IncSr Diesel Mechanic PTO & Benefits!Cicero, IL$30.31–$45.49 / hourRequired to be exposed to physical occupational risks (such as cuts, burns, exposure to toxic chemicals, etc.) often; Required to be exposed to physical environment which involves dirt, odors, noise, weather extremes or similar elements often; This job operates in both inside garage, shop or gas plant conditions as well as in outside conditions that include inclement weather, heat and humidity. WM has the largest disposal network and collection fleet in North America, is the largest recycler of post‑consumer materials and is a leader in beneficial use of landfill gas, with a growing network of renewable natural gas plants and the most landfill gas‑to‑electricity plants in North America.
Diesel Mechanic up to 35.00 per hour Aim Transportation Solutions IncDiesel Mechanic up to 35.00 per hourSouth Holland, IL$26–$35 / hourWhether you specialize in preventative maintenance, electrical systems, or advanced diagnostics, we have a shift that fits your experience and pay expectations. Aim Transportation Solutions is hiring Diesel Mechanics and Diesel Technicians in South Holland, IL.
Journeyman Diesel Mechanic Interstate Companies, Inc.Journeyman Diesel MechanicCarol Stream, ILKey Responsibilities: Diagnose and Repair: Troubleshoot complex mechanical, hydraulic, electrical, and electronic systems on heavy-duty diesel trucks using advanced diagnostic tools, schematics, and technical manuals (e.g., Cummins Insite, Detroit Diesel Diagnostic Link). Perform Maintenance: Conduct routine preventive maintenance, including oil changes, filter replacements, tire inspections, brake adjustments, and chassis lubrication to ensure truck reliability and compliance with federal and state regulations.
Level 1 - Union Diesel Mechanic LyonsLevel 1 - Union Diesel MechanicLyons, IllinoisWe're the largest network of commercial vehicle dealerships in the U.S. With a strong reputation and deep industry roots, we provide our technicians with stability, opportunity, and a supportive work environment. In this entry-level role, you’ll support our lead and journeyman technicians while building hands-on skills in diagnostics, repair, and heavy-duty vehicle maintenance.
Diesel Mechanic - 3rd Shift Maverick Transportation.Diesel Mechanic - 3rd ShiftPortage, IndianaWhile performing the functions of this job, the employee is frequently required to stand, walk, sit, use hands to finger, handle, or feel, reach with hands and arms, talk or hear; and frequently required to climb or balance, stoop, kneel, crouch, or crawl. data processing, clerical/administrative, equipment operation, etc., plus 7 to 11 months related experience and/or training, and 1 to 6 months related management experience, or equivalent combination of education and experience.
Diesel Mechanic Maverick Transportation.Diesel MechanicPortage, IndianaWhile performing the functions of this job, the employee is frequently required to stand, walk, sit, use hands to finger, handle, or feel, reach with hands and arms, talk or hear; and frequently required to climb or balance, stoop, kneel, crouch, or crawl. data processing, clerical/administrative, equipment operation, etc., plus 7 to 11 months related experience and/or training, and 1 to 6 months related management experience, or equivalent combination of education and experience.
Diesel Mechanic - 1st Shift Maverick Transportation.Diesel Mechanic - 1st ShiftPortage, IndianaWhile performing the functions of this job, the employee is frequently required to stand, walk, sit, use hands to finger, handle, or feel, reach with hands and arms, talk or hear; and frequently required to climb or balance, stoop, kneel, crouch, or crawl. data processing, clerical/administrative, equipment operation, etc., plus 7 to 11 months related experience and/or training, and 1 to 6 months related management experience, or equivalent combination of education and experience.
Diesel Mechanic - DWKND Shift-3 Maverick Transportation.Diesel Mechanic - DWKND Shift-3Portage, IndianaWhile performing the functions of this job, the employee is frequently required to stand, walk, sit, use hands to finger, handle, or feel, reach with hands and arms, talk or hear; and frequently required to climb or balance, stoop, kneel, crouch, or crawl. data processing, clerical/administrative, equipment operation, etc., plus 7 to 11 months related experience and/or training, and 1 to 6 months related management experience, or equivalent combination of education and experience.
NewDiesel Mechanic - DWKND Shift Maverick Transportation.Diesel Mechanic - DWKND ShiftPortage, IndianaWhile performing the functions of this job, the employee is frequently required to stand, walk, sit, use hands to finger, handle, or feel, reach with hands and arms, talk or hear; and frequently required to climb or balance, stoop, kneel, crouch, or crawl. data processing, clerical/administrative, equipment operation, etc., plus 7 to 11 months related experience and/or training, and 1 to 6 months related management experience, or equivalent combination of education and experience.
Diesel Mechanic Technician - 2nd Shift Midwest Transit EquipmentDiesel Mechanic Technician - 2nd ShiftGary, IndianaWe maintain thousands of vehicles at eight locations in five states and over 300 employees committed to providing safe, comfortable and reliable transportation for our customers around the world. Servicing of gasoline and diesel powered buses from basic maintenance and minor repairs to full vehicle service.
Diesel Mechanic Technician Midwest Transit EquipmentDiesel Mechanic TechnicianGary, IndianaWe maintain thousands of vehicles at eight locations in five states and over 300 employees committed to providing safe, comfortable and reliable transportation for our customers around the world. Servicing of gasoline and diesel powered buses from basic maintenance and minor repairs to full vehicle service.
Travel Diesel Technician/Mechanic Amerit Fleet SolutionsTravel Diesel Technician/MechanicCHICAGO, Illinois$35–$45 / hourp style="margin:0px">https://www.ameritfleetsolutions.com/careers/easy-apply. Amerit Fleet Solutions, a leader in fleet maintenance across the U.S., is hiring a skilled Travel Diesel Technician/Mechanic to join our team in Chicago, IL..
Journeyman Diesel Mechanic - Second Shift Interstate CompaniesJourneyman Diesel Mechanic - Second ShiftCarol Stream, IL$30–$47.90 / hourDiagnose and Repair: Troubleshoot complex mechanical, hydraulic, electrical, and electronic systems on heavy-duty diesel trucks using advanced diagnostic tools, schematics, and technical manuals (e.g., Cummins Insite, Detroit Diesel Diagnostic Link). Perform Maintenance: Conduct routine preventive maintenance, including oil changes, filter replacements, tire inspections, brake adjustments, and chassis lubrication to ensure truck reliability and compliance with federal and state regulations.
Lead Diesel Technician Mechanic NFI Industries IncLead Diesel Technician MechanicChannahon, IL$34–$36 / hourMust have a valid driver's license • Preferred ability to obtain a Class B license • Technical or advanced degree or 3-5 years of equivalent maintenance experience • Familiarity with troubleshooting equipment repairs and maintenance with diagnostic tools and equipment such as JPRO, OEM Diagnostic Software, Multimeters, and Windows • Successfully demonstrated problem-solving skills. • Perform preventive maintenance on our fleet of trucks & trailers • Perform DOT inspection per FMCSA guidelines • Physically capable of performing all job duties, which include being able to lift and/or pull 75 lbs or more without restriction, stand or lie for extended periods, and have flexible movement to reach equipment.
Journeyman Diesel Mechanic - Second Shift Interstate Companies, IncJourneyman Diesel Mechanic - Second ShiftCarol Stream, IL$30–$47.90 / hourDiagnose and Repair: Troubleshoot complex mechanical, hydraulic, electrical, and electronic systems on heavy-duty diesel trucks using advanced diagnostic tools, schematics, and technical manuals (e.g., Cummins Insite, Detroit Diesel Diagnostic Link). Perform Maintenance: Conduct routine preventive maintenance, including oil changes, filter replacements, tire inspections, brake adjustments, and chassis lubrication to ensure truck reliability and compliance with federal and state regulations.
Diesel Technician Mechanic NFI Industries IncDiesel Technician MechanicChannahon, IL$29–$30 / hourp>• Must have a valid driver's license • Preferred ability to obtain a Class B license • Technical or advanced degree or 2 years or more of equivalent maintenance experience • Familiarity with troubleshooting equipment repairs and maintenance with diagnostic tools and equipment such as JPRO, OEM Diagnostic Software, Multimeters, and Windows • Successfully demonstrated problem-solving skills. Working in our shops, you'll be at the heart of keeping our fleet running safely and efficiently, performing truck maintenance, diagnostics, and repairs on a dedicated commercial fleet.
Diesel & Trailer Technician/Mechanic Amerit Fleet SolutionsDiesel & Trailer Technician/MechanicChicago, Illinois$30–$38 / hourp style="margin:0px">https://www.ameritfleetsolutions.com/careers/easy-apply. Amerit Fleet Solutions, a leader in fleet maintenance across the U.S., is hiring a skilled Diesel Technician/Mechanic to join our team in Chicago, IL..
Diesel Mechanic Fields Auto GroupDiesel MechanicOrland Park, ILCommercial Van Experience preferred, but not required • A-level qualifications, including Diagnostic, Electrical, and Engine Repair • Excellent customer service skills • Basic Computer skills • Positive, friendly attitude, along with a customer service mentality • Enjoy working in a fast-paced environment • Team player • Valid Drivers License with an acceptable motor vehicle driving record according to dealership guidelines. • Perform work specified on the repair order with efficiency and in accordance with the dealership • Test-drive vehicles, and test components and systems, using diagnostic tools and special service equipment • Diagnosing, maintaining, and repairing vehicle automotive systems, including engine, transmission, electrical steering, suspension, brakes, air conditioning, etc.
NewDiesel Mechanic Pros MechanicsDiesel MechanicCrestwood, IllinoisPerform routine maintenance and repairs on diesel engines, including oil changes, filter replacements, and system diagnostics; replace and repair major internal engine components, transmission repairs, and rebuilds. We are seeking Experienced Diesel Mechanics for our repair facility in Crestwood, IL, to repair our fleet of semi -trucks and trailers.
Journeyman Diesel Mechanic - Second Shift Interstate Companies IncJourneyman Diesel Mechanic - Second ShiftCarol Stream, IL$30–$47.90 / hourDiagnose and Repair: Troubleshoot complex mechanical, hydraulic, electrical, and electronic systems on heavy-duty diesel trucks using advanced diagnostic tools, schematics, and technical manuals (e.g., Cummins Insite, Detroit Diesel Diagnostic Link). Perform Maintenance: Conduct routine preventive maintenance, including oil changes, filter replacements, tire inspections, brake adjustments, and chassis lubrication to ensure truck reliability and compliance with federal and state regulations.
Diesel Mechanic Trainee Entry Level Ryder System IncDiesel Mechanic Trainee Entry LevelRomeoville, ILAttend and complete all Technician Training Development Program requirements and assessments; training will include hands-on and online training as well as performing tasks learned; Technician Training Development Program will include but is not limited to:Service Island Training: Service island multi-point inspection (includes hand held). Perform multi-point inspection on inbound units as required by company policies and procedures; this includes checking vehicle tire pressure and thread, fluid levels, lights, washing vehicle windows, changing tires, inspecting refrigeration units on trucks, and reporting service or driver issues to shop.
Service Technician/Diesel Mechanic JX Enterprises IncService Technician/Diesel MechanicLansing, IL$23–$38 / hourWith a dedication to honoring commitments, creating positive experiences, fostering lifelong learning, exhibiting a pioneering spirit, and demonstrating good stewardship, you will contribute to our mission of providing top-notch service to our customers. • Corrects vehicle deficiencies by removing, repairing, adjusting, overhauling, assembling, disassembling, and replacing major assemblies, sub-assemblies, components, or parts, showcasing innovative problem-solving skills and techniques.
Apprentice Diesel Tech-Mechanic TravelCenters of AmericaApprentice Diesel Tech-MechanicMonee, IL$17–$20.40 / hourRepairing malfunctioning parts and other mechanical or electrical equipment; Complete repairs safely, effectively and efficiently. High School Diploma or GED; Graduate of acceptable trade school or manufacturer’s technical school, or previous mechanic experience.
Diesel Mechanic The Custom Companies IncDiesel MechanicIL$26–$34 / hourOur shop prioritizes safety, quality repairs, and realistic workloads, offering long-term stability, respect for your craft, and opportunities to grow your skills. Location: Northlake, IL 60164 Pay Rate: $26.00 - $34.00 Hourly Open Positions: 1 Days Worked: Mon., Tue., Wed., Thu., Fri., Sat.
Diesel Mechanic First Student IncDiesel MechanicGARY, IN$22–$25 / hourIn the state of Washington, all technician and driving positions, including but not limited to van drivers and any other position requiring employees to drive a company-owned vehicle, are considered safety-sensitive and are therefore subject to drug and alcohol testing, including cannabis. Diagnose and perform all phases of vehicle maintenance including the repair of brakes and brake inspections, engine tune-ups, suspensions, drive trains, transmission clutches and other repairs.
Diesel Mechanic Cars TransportDiesel MechanicMerrillville, INEnhances maintenance department and organization reputation by accepting ownership for accomplishing new and different requests; exploring opportunities to add value to job accomplishments. With over 20 years of industry experience, our team of dedicated drivers provides industry leading service to the auto dealership and auto auction marketplaces.
Diesel Mechanic - 2nd Shift Waste Connections IncDiesel Mechanic - 2nd ShiftElgin, IL$5–$10 / hourCompletes required paperwork utilizing fleet maintenance software program associated with repairing vehicles, documenting parts usage, and accounting for repair times. Our Diesel Mechanic will work directly with the Maintenance Manager to ensure safe diagnostics and repair of our truck fleet and equipment.
Mobile Diesel Mechanic Prestige Fleet ServicesMobile Diesel MechanicChicago, Illinois$29–$36 / hourul>Perform repairs and inspections on a variety of Class 6-8 trucks and trailers, such as brakes, diagnostics, A/C systems, electrical systems, engine components, exhaust systems, after-treatment systems, lift-gates, tires, etc. On-Site Truck and Trailer Maintenance and Repairs: Our mobile repair experts come to you, performing all maintenance and repairs at your location and around your schedule.
Mechanic / Light-Duty Diesel Mechanic Jim's Towing & AutomotiveMechanic / Light-Duty Diesel MechanicElgin, Illinois$18–$40We are seeking a reliable and skilled Mechanic / Light-Duty Diesel Mechanic to inspect, maintain, and repair a variety of gasoline and light-duty diesel vehicles. This role involves diagnosing mechanical issues, performing routine maintenance, and ensuring all vehicles are safe, efficient, and operating at peak performance.
NewMobile Diesel Mechanic Rockstar RecruitingMobile Diesel MechanicMelrose Park, IllinoisYou’ll be working on diesel trucks, handling diagnostics, repairs, PMs, electrical, brakes, suspension, and general fleet work. We’re looking for a solid Mobile Diesel Mechanic who knows their way around trucks and fleet equipment and can work without someone holding their hand all day.
Diesel Mechanic Technician Ryder System IncDiesel Mechanic TechnicianSt. Charles, ILDemonstrated aptitude and applied experience in mechanical repair of automotive gas or diesel engines including: Routine preventative maintenance, which should include oil changes, brake and tire work. Important Note: Some positions require additional screening that may include employment and education verification; motor vehicle records check and a road test; and/or badging or background requirements of the customer to which you are assigned.
Diesel Mechanic A Reyes Holdings LLCDiesel Mechanic ANiles, IL$31–$37 / hourAt the Reyes Family of Businesses, our Total Rewards Strategy prioritizes the holistic well-being of our employees, and our compensation philosophy embraces diverse factors for fair pay decisions, valuing skills, experience, and the needs of our business. This position may require driving Reyes Family of Businesses, Reyes Fleet Management and customer vehicles, it is regulated by the DOT and requires a current driver qualification file to be maintained as required by the role.
Diesel Mechanic B Reyes Holdings LLCDiesel Mechanic BChicago, ILp>At the Reyes Family of Businesses, our Total Rewards Strategy prioritizes the holistic well-being of our employees, and our compensation philosophy embraces diverse factors for fair pay decisions, valuing skills, experience, and the needs of our business. This position requires driving Reyes Family of Businesses, Reyes Fleet Management and customer vehicles, it is regulated by the DOT and requires a current driver qualification file to be maintained as required by the role.
Diesel Mechanic Saia IncDiesel MechanicBurr Ridge, IL$33.50–$38.10 / hourRead, write, communicate and comprehend the English language in order to perform the various tasks of the job, including but not limited to: converse with co-workers and members of the general public; understand oral and written instructions as well as governmental regulations; respond to questions and inquiries from management and government representatives; and accurately review and complete various documents, reports and records required of the position. Troubleshoots the repairs of heavy-duty truck engines, braking, electrical, and exhaust systems.