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Key Responsibilities and Required Skills for a Heavy Truck Mechanic

💰 $28 - $45+ per hour, based on experience and certifications

Skilled TradesTransportationMaintenanceAutomotiveLogistics

🎯 Role Definition

This role requires a dedicated and highly skilled Heavy Truck Mechanic to join our dynamic team. In this pivotal role, you will be the backbone of our fleet's reliability and safety, responsible for performing comprehensive diagnostics, complex repairs, and preventative maintenance on our diverse range of heavy-duty trucks and trailers. The ideal candidate is a proactive problem-solver with a deep understanding of diesel engines, electrical systems, and air brakes, who thrives in a fast-paced environment and is committed to upholding the highest standards of quality and safety.

📈 Career Progression

Typical Career Path

Entry Point From:

  • Diesel Technology Program Graduate
  • Automotive Technician seeking specialization
  • Apprentice Mechanic / Technician's Helper

Advancement To:

  • Lead Diesel Technician / Shop Foreman
  • Fleet Maintenance Manager
  • Service Manager / Service Writer

Lateral Moves:

  • Field Service Technician
  • Technical Trainer / Instructor
  • Parts Manager

Core Responsibilities

Primary Functions

  • Perform comprehensive preventative maintenance (PM) inspections on tractors, trailers, and other heavy-duty equipment to ensure operational safety and minimize downtime.
  • Diagnose, troubleshoot, and repair complex mechanical and electrical failures in heavy-duty trucks, including issues with engines (e.g., Cummins, Detroit Diesel, PACCAR), transmissions, differentials, and emissions control systems.
  • Utilize advanced electronic diagnostic software and tools (e.g., JPRO, OEM software) to accurately identify fault codes, interpret data, and determine the most effective repair strategies for modern, computer-controlled vehicles.
  • Conduct thorough inspections, repairs, and overhauls of air brake systems, ensuring full compliance with Federal Motor Carrier Safety Administration (FMCSA) and DOT regulations.
  • Repair and maintain chassis components, including steering systems, suspensions (air-ride and spring), fifth wheels, and driveline components to ensure vehicle stability and driver safety.
  • Execute complete electrical system diagnostics and repairs, addressing issues with wiring harnesses, lighting, starting and charging systems, and onboard electronic control modules (ECMs).
  • Perform federal and state-required DOT annual vehicle inspections, accurately documenting findings and completing necessary repairs to certify vehicle roadworthiness.
  • Respond to and resolve road calls for emergency breakdowns in a timely and efficient manner, performing on-site diagnostics and repairs to get drivers back on the road safely.
  • Service and repair vehicle heating, ventilation, and air conditioning (HVAC) systems to ensure driver comfort and operational functionality.
  • Perform welding and metal fabrication tasks as needed for structural repairs on frames, chassis, and other vehicle components.
  • Mount, dismount, and balance tires, as well as perform tire repairs and replacements in accordance with industry best practices.
  • Maintain meticulous and accurate records of all maintenance and repair work performed, including parts used and labor hours, utilizing a computerized maintenance management system (CMMS).
  • Communicate effectively with drivers and fleet managers regarding vehicle condition, required repairs, and estimated completion times to facilitate efficient fleet operations.
  • Manage parts inventory, including sourcing, ordering, and tracking necessary components to ensure availability for scheduled and unscheduled repairs.
  • Road test vehicles before and after repairs to verify the effectiveness of the work performed and ensure all systems are operating to specification.
  • Troubleshoot and repair hydraulic systems, including those for liftgates, wet kits, and other specialized equipment.
  • Ensure a clean, safe, and organized work environment by adhering to all shop safety procedures, including lock-out/tag-out (LOTO) and proper handling of hazardous materials.
  • Mentor and provide guidance to apprentice technicians, sharing knowledge and best practices to foster team development and skill growth.
  • Perform engine overhauls and replacements, including disassembly, inspection of components, and reassembly to manufacturer specifications.
  • Diagnose and repair after-treatment systems, including Diesel Particulate Filters (DPF), Selective Catalytic Reduction (SCR), and Diesel Exhaust Fluid (DEF) systems.
  • Inspect, service, and repair trailer components, including landing gear, roll-up and swing doors, flooring, and roof repairs.
  • Stay current with emerging vehicle technologies, industry trends, and manufacturer service bulletins to continuously enhance technical expertise.

Secondary Functions

  • Assist in maintaining shop cleanliness, organization, and the proper functioning of all shop tools and equipment.
  • Provide expert input to management on the procurement of new tools, diagnostic equipment, and shop supplies.
  • Actively participate in regular safety meetings and contribute to the continuous improvement of shop safety protocols.
  • Collaborate with the parts department to ensure accurate inventory levels and timely procurement of non-stocked items.

Required Skills & Competencies

Hard Skills (Technical)

  • Diesel Engine Diagnostics & Repair (Cummins, Detroit, PACCAR, etc.)
  • Air Brake System Service & Certification
  • Electrical & Electronic Systems Troubleshooting
  • Preventative Maintenance Procedures
  • DOT Inspection & Compliance Knowledge
  • Welding and Metal Fabrication (MIG, Stick)
  • Hydraulic System Diagnostics and Repair
  • Proficiency with Diagnostic Software (e.g., Insite, DDDL, Tech Tool)
  • Drivetrain, Transmission, and Clutch Repair
  • HVAC System Service and Repair
  • After-treatment System (DPF/SCR/DEF) Diagnostics

Soft Skills

  • Advanced Problem-Solving
  • Meticulous Attention to Detail
  • Effective Time Management & Prioritization
  • Clear and Professional Communication
  • Collaborative Teamwork
  • Strong Safety-First Mindset
  • Adaptability to New Technologies

Education & Experience

Educational Background

Minimum Education:

  • High School Diploma or GED equivalent.

Preferred Education:

  • Diploma or Associate's Degree from a technical school in Diesel Technology, Heavy Truck Maintenance, or a related field.

Relevant Fields of Study:

  • Diesel Mechanics
  • Automotive Technology
  • Heavy Equipment Maintenance

Experience Requirements

Typical Experience Range: 3-5+ years of hands-on experience as a heavy truck or diesel mechanic.

Preferred:

  • ASE (Automotive Service Excellence) certifications in relevant heavy-duty truck areas (T1-T8).
  • Valid Commercial Driver's License (CDL), Class A or B.
  • Manufacturer-specific training or certifications (e.g., Cummins, Freightliner, PACCAR).
  • Experience working within a fleet maintenance environment.
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