Diesel Technician IV - Master Technician

Job Overview The Diesel Technician IV - Master Technician - serves as the shop's highest technical authority and handles the most difficult diagnostics, major repairs, and technical development. This position independently diagnoses, maintains, and repairs Class 8 tractors, trailers, and related equipment; verifies root causes; provides final technical direction on high-cost repairs; and helps ensure safe, reliable, and efficient fleet operations in compliance with company, federal, and state requirements. To perform this job successfully, an individual must be able to perform each essential function and essential duty listed below satisfactorily. The requirements listed below are representative of the knowledge, skills and/or abilities required. Reasonable accommodation may be made to enable individuals with disabilities to perform the essential functions. Direct Reports/Supervision: Operates with minimal technical oversight. May assign, direct, or review technical work but is not automatically a people manager. Serves as a technical leader and mentor for Diesel Technicians I-III. Duties and Responsibilities: Advanced Diagnostics and Technical Direction: Analyze fault histories, data logs, electrical waveforms, pressures, temperatures, wiring diagrams, performance trends, and OEM service information. Communicate with OEM technical support, dealership personnel, and approved vendors when additional technical assistance is required. Diagnose repeat repairs and unresolved work returned from vendors or dealerships. Diagnose the shop's most complex, intermittent, multi-system, and previously misdiagnosed failures. Lead advanced engine, transmission, aftertreatment, electrical, network, fuel, air-brake, HVAC, steering, suspension, hydraulic, and driveline diagnostics. Provide final technical direction on high-cost repairs and verify root cause before recommending major component replacement. Use a structured test-and-confirm process rather than replacing parts by trial and error. Verify and clearly explain the failure, root cause, repair, and recommended steps to prevent recurrence. Major Repairs and Preventive Maintenance: Conduct operational checks and authorized road tests to verify performance, confirm repairs, diagnose remaining issues, and ensure equipment is safe to return to service. Perform advanced mechanical and electronic repairs on Class 8 tractors, trailers, and related fleet equipment. Perform complete preventive maintenance services, including fluid and filter service, lubrication, tire and wheel service, component inspections, and correction of identified deficiencies. Perform or direct major engine, transmission, and drivetrain overhauls. Remove, repair, adjust, overhaul, assemble, disassemble, and replace major assemblies, subassemblies, components, and systems. Support mobile repairs and breakdown response when assigned. Quality Control, Compliance, and Reliability: Control costs by conserving tools, equipment, parts, and supplies; use warranty coverage and evaluate parts and service options when appropriate. Develop and improve troubleshooting procedures, repair standards, inspection practices, and technical documentation. Help determine whether equipment should be repaired in-house, outsourced, deferred, or recommended for replacement. Perform post-repair quality-control inspections and verify repairs meet company, OEM, DOT, and applicable commercial motor vehicle requirements. Perform thorough DOT inspections on tractors and trailers when properly qualified and authorized. Review repeat failures, road calls, comebacks, and preventable breakdowns; identify corrective actions and opportunities to prevent recurrence. Technical Leadership and Documentation: Assist management with tooling, diagnostic software, technical training, and equipment-support decisions. Maintain accurate service and repair records using company computer systems, including findings, tests, measurements, parts, labor, repairs performed, and…

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