Diesel Mechanic

Summary

The diesel mechanic is responsible for inspecting, diagnosing, repairing, and maintaining a fleet of diesel‑powered tractors and trailers to keep trucks safe, compliant, and on the road. This role supports daily freight operations by reducing breakdowns, ensuring DOT readiness, and completing both scheduled and unscheduled repairs.

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Key Responsibilities

- Inspect, diagnose, and repair diesel engines, aftertreatment systems, transmissions, drivelines, suspensions, steering, brakes (including air brakes), electrical and HVAC systems on tractors and trailers.

- Perform scheduled preventive maintenance (PMs) on fleet units, including oil and filter changes, lubrication, fluid checks, belt and hose inspections, tire inspection/rotation, and DOT‑required inspections.

- Use diagnostic software and scan tools to troubleshoot engine codes, ABS, and other electronic systems, then perform corrective repairs.

- Prepare units for DOT inspections, correct safety defects, and ensure all equipment meets federal, state, and company standards.

- Perform trailer repairs including lighting, wiring, air systems, doors, floors, kingpins, landing gear, and suspension components.

- Complete accurate work orders documenting complaints, diagnostics, labor, parts used, and final repair actions.

- Communicate clearly with dispatch, drivers, and supervisors about unit status, repair timelines, and any safety concerns.

- Respond to occasional road calls to diagnose and repair breakdowns safely on the roadside or arrange safe towing.

- Maintain shop tools, equipment, and work area in a clean, safe, and organized condition; follow all safety and PPE requirements.

- Assist with monitoring parts inventory and notifying management of needed stock for common fleet repairs.

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Qualifications

- High school diploma or GED; diesel technology or related trade school preferred.

- Previous experience as a diesel mechanic/technician working with tractors and trailers (or strong general diesel experience with willingness to learn trucking equipment).

- Strong knowledge of heavy‑duty diesel engines, air brake systems, suspensions, electrical systems, and diagnostic software.

- Ability to read and interpret work orders, wiring diagrams, service manuals, and fault code descriptions.

- Valid drivers license; CDL Class A is a plus and may be required for road tests or road service.

- Ability to lift heavy components, work under and around trucks and trailers, and stand or work in awkward positions for extended periods.

- Solid problem‑solving skills, attention to detail, and the ability to work independently or as part of a team in a fast‑paced fleet environment.

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Working Conditions

- Shop and yard environment with exposure to noise, diesel fumes, oils, and moving vehicles.

- May require evenings, weekends, overtime, and occasional on‑call or roadside work depending on fleet needs.