Diesel Mechanic

Job Description

Job Description

Benefits/Perks

• Careers Advancement Opportunities
• Competitive Compensation

Position Summary

The Service Technician / Diesel Mechanic is responsible for inspecting, diagnosing, repairing, and maintaining medium- and heavy-duty trucks, trailers, and related equipment. This position performs preventive maintenance and complex mechanical, electrical, hydraulic, and diagnostic repairs while ensuring all work meets company, manufacturer, and safety standards. The Service Technician plays a key role in minimizing vehicle downtime, maintaining repair quality, and delivering exceptional service to customers.

Essential Duties and Responsibilities

Diagnostics & Troubleshooting

• Inspect and diagnose mechanical, electrical, hydraulic, pneumatic, and electronic systems. 
• Use computerized diagnostic equipment to identify faults. 
• Interpret diagnostic codes and service information. 
• Determine root causes of equipment failures. 
• Recommend repair solutions and identify additional repair needs. 

Repairs & Maintenance

• Perform preventive maintenance services according to manufacturer and company standards. 
• Repair and replace diesel engines, transmissions, differentials, and drive train components. 
• Repair brake systems, suspension, steering, and air systems. 
• Diagnose and repair electrical systems, wiring, batteries, charging systems, and lighting. 
• Service cooling systems, fuel systems, and exhaust aftertreatment systems. 
• Repair hydraulic and pneumatic systems as required. 
• Perform welding and fabrication when necessary. 
• Conduct trailer repairs, including brakes, suspension, lighting, and structural components. 
• Complete road tests and operational inspections following repairs. 

Quality Assurance

• Ensure all repairs are completed accurately and safely. 
• Perform final inspections before releasing equipment. 
• Minimize rework and warranty repairs. 
• Follow manufacturer repair procedures and specifications. 
• Maintain high standards of workmanship and attention to detail. 

Documentation

• Accurately complete repair orders and technician notes. 
• Record labor hours and parts used. 
• Document diagnostic procedures and repair recommendations. 
• Report additional repair needs to the Service Writer or Shop Foreman. 
• Maintain accurate warranty documentation when applicable. 

Equipment & Tool Maintenance

• Properly use and maintain shop tools and diagnostic equipment. 
• Keep assigned work area clean and organized. 
• Report damaged or malfunctioning equipment. 
• Protect company tools and customer property. 

Safety & Compliance

• Follow all company safety policies and OSHA regulations. 
• Wear required personal protective equipment (PPE). 
• Maintain a clean and safe work area. 
• Properly dispose of hazardous materials and waste. 
• Report accidents, injuries, and unsafe conditions immediately. 

Teamwork & Communication

• Work collaboratively with the Shop Foreman, Service Writer, and Parts Department. 
• Communicate repair status and parts requirements. 
• Assist other technicians when needed. 
• Participate in technical training and shop meetings. 
• Maintain professional interactions with customers when required. 

Qualifications

• High school diploma or GED required. 
• Technical or vocational training in diesel technology preferred. 
• Two or more years of experience repairing medium- or heavy-duty trucks (entry-level positions may require less). 
• Strong knowledge of diesel engines, brakes, suspension, steering, electrical systems, HVAC, and drivetrain components. 
• Experience using electronic diagnostic software and scan tools. 
• Ability to read service manuals, wiring diagrams, and technical documents. 
• Valid driver's license required; CDL preferred or ability to obtain one. 
• ASE Medium/Heavy Truck Certifications or manufacturer certifications are preferred. 

Preferred Skills

• Advanced diagnostic and troubleshooting skills. 
• Experience with Cummins, Detroit Diesel, Paccar, Caterpillar, Volvo, Mack, or International engines. 
• Welding and fabrication experience. 
• Hydraulic and pneumatic system repair experience. 
• Knowledge of emissions systems and aftertreatment diagnostics. 
• Strong problem-solving and time management skills. 

Physical Requirements

• Frequently lift up to 75 pounds; heavier lifting with assistance or equipment. 
• Stand, walk, bend, kneel, climb, and work in awkward positions throughout the day. 
• Operate hand tools, power tools, diagnostic equipment, and heavy machinery. 
• Work in indoor and outdoor shop environments with exposure to noise, chemicals, grease, and varying weather conditions. 

Primary Functions

• Diagnose mechanical and electrical issues. 
• Perform preventive maintenance inspections and services. 
• Repair diesel engines and powertrain components. 
• Repair brake, steering, suspension, and air systems. 
• Diagnose and repair electrical and electronic systems. 
• Repair hydraulic and pneumatic systems. 
• Perform trailer maintenance and repairs. 
• Conduct road tests and post-repair inspections. 
• Complete repair documentation accurately. 
• Maintain tools and work area. 
• Follow all safety policies and procedures. 
• Communicate effectively with the Shop Foreman, Service Writer, and Parts Department. 
• Maintain repair quality and productivity standards. 

Key Performance Expectations

• High repair quality with minimal comebacks. 
• Accurate diagnostics and efficient troubleshooting. 
• Consistent productivity and labor efficiency. 
• Timely completion of assigned repair orders. 
• Accurate repair documentation and time reporting. 
• Compliance with safety policies and procedures. 
• Proper care of tools and equipment. 
• Positive teamwork and communication. 
• Continued participation in technical training and skill development. 
• High level of professionalism and customer focus.