Michael Sullivan
Summary
Diesel mechanic dedicated to optimizing vehicle performance through expert diagnostics and repairs. Extensive experience with Cummins engine systems, fuel injection, and electrical troubleshooting. Successfully trained junior mechanics, contributing to improved safety protocols and operational standards within the team.
Overview
8
8
years of professional experience
Work History
Diesel Mechanic
Doggett Freightliner
San Antonio, Texas
05.2026 - Current
- Train junior mechanics in best practices and safety standards.
- Repair fuel injection systems, turbochargers, brakes, and exhaust systems.
- Test electrical circuits for faults using diagnostic computers.
- Evaluate vehicle systems to assess function and uncover defects.
- Install new parts such as radiators, injectors, hoses, belts, alternators, and starters.
- Proficient in servicing and diagnosing Cummins ISB, ISC, ISX12, ISX15, and CNG engines.
Diesel Mechanic
Bruckner Truck & Equipment - Mack & Volvo
San Antonio, Texas
05.2025 - 05.2026
- Maintained, diagnosed, and repaired Cummins engines, including ISB, ISC, ISX12, ISX15, and CNG systems.
- Performed preventive maintenance and routine service on Mack and Volvo trucks and equipment to ensure safe and reliable operation.
- Used manual and computer-assessed diagnostic devices to test equipment and determine repair needs.
- Worked with a team of mechanics to complete projects efficiently within time limits.
- Inspected vehicles for safety issues and roadworthiness.
Diesel Mechanic
DOGGETT FREIGHTLINER
TX, TX
01.2019 - 05.2025
- Diagnosed malfunctions using inspections, computer-assisted diagnostic equipment, and road tests to identify and resolve mechanical and electrical issues.
- Investigated engine electronic system failures and performed accurate diagnostics and repairs.
- Repaired diesel engines by replacing components, correcting mechanical failures, and performing complete engine rebuilds when required.
- Performed preventive maintenance, including oil changes, battery inspections, lubrication, and scheduled service to maximize equipment reliability.
- Adjusted, inspected, and repaired heavy-duty air brake systems, steering components, wheel bearings, and other critical safety systems.
- Performed repairs and maintenance on heavy-duty trucks and diesel engines in accordance with manufacturer specifications and quality standards.
Education
Diploma - Diesel Heavy Truck
SOUTH TEXAS VOCATIONAL TECHNICAL INSTITUTE
San Antonio, TX, United States01-2018
Diploma -
TEMPLE HIGH SCHOOL
Temple, TX, United StatesTemple, TX, United States
Skills
- System Diagnostics & Troubleshooting
- Cummins Engine Service & Repair
- Electronic Control Module (ECM) Diagnostics and Programming
- Electrical Testing & Diagnostics
- Preventive Maintenance
- Mechanical Repair & Troubleshooting
- Fuel Injection System Repair
- Problem Solving & Root Cause Analysis
Timeline
Diesel Mechanic
Doggett Freightliner
05.2026 - Current
Diesel Mechanic
Bruckner Truck & Equipment - Mack & Volvo
05.2025 - 05.2026
Diesel Mechanic
DOGGETT FREIGHTLINER
01.2019 - 05.2025
Diploma - Diesel Heavy Truck
SOUTH TEXAS VOCATIONAL TECHNICAL INSTITUTE
Diploma -
TEMPLE HIGH SCHOOL