Diesel Mechanic

SET Environmental Inc; Wheeling (IL); On-site; USD 55,000 - 75,000; Full time

Job summary

SET Environmental Inc. seeks an experienced Diesel Mechanic to perform preventive maintenance, diagnose and repair heavy‑duty diesel trucks, and service emissions systems in our workshop.

You will handle electrical, hydraulic, and PTO components, follow OEM procedures, and document repairs with detailed work orders. The role requires 3+ years of diesel experience, CDL/A or ability to obtain, and a strong safety mindset.

Qualifications

• 3+ years diagnosing and repairing heavy‑duty diesel trucks and related systems.
• Ability to read wiring diagrams and use diagnostic software and electrical test equipment.
• CDL-A or CDL, or ability to obtain; DOT physical and valid DOT medical card required.
• ASME-BASE medium/heavy truck certifications or equivalent experience preferred.
• OEM diagnostic experience and hydraulic/PTO experience preferred.

Responsibilities

• Perform preventive maintenance and inspect heavy vehicles for defects.
• Diagnose and repair diesel engines, fuel, cooling, starting, charging, and electrical systems.
• Diagnose diesel emissions faults (DPF, SCR, DEF) and complete repairs per procedures.
• Inspect and repair brakes, air systems, steering, suspension, driveline, and trailers.
• Troubleshoot and maintain hydraulic systems, PTOs, and auxiliary equipment.
• Create work orders with findings, parts, and labor; verify repairs with tests.
• Maintain shop safety, cleanliness, and timely communication of repair status.

Skills

Reading wiring diagrams

Diagnostic software usage

Electrical test equipment

Team collaboration

Education

High School Diploma or equivalent

ASME-BASE medium/heavy truck certifications or equivalent

Tools

Diagnostic tools

OEM service procedures manuals

Job description

POSITION DESCRIPTION

A Diesel Mechanic at SET Environmental is responsible for:

• Perform scheduled preventive maintenance and inspect heavy vehicles and equipment for developing defects.
• Diagnose and repair diesel engines, fuel, cooling, starting, charging, and electrical systems using scan tools, service information, and test equipment.
• Diagnose diesel emissions and after treatment faults, including DPF, SCR, and DEF systems; complete repairs using approved procedures.
• Inspect and repair air brakes, air systems, steering, suspension, driveline, and trailer systems within demonstrated qualifications.
• Troubleshoot, repair, and maintain hydraulic systems, power takeoffs, and auxiliary equipment
• Review DVIR defects and communicate safety concerns promptly. Follow out-of-service lockout, and return-to-service procedures.
• Create Work Orders for each repair, documenting the initial complaint, diagnostic findings, repair performed, parts, and labor on each work order.
• Verify repairs through appropriate operational checks and road tests.
• Maintain a clean shop and communicate parts needs and repair status effectively.
• Commit to working safely at all times.
• Commit to completing work to OEM standards and best practices.
• Performing miscellaneous tasks as needed/required

POSITION REQUIREMENTS

• High School Diploma, or equivalent
• 3yrs experience diagnosing and repairing heavy-duty diesel trucks and related systems.
• Ability to read wiring diagrams, use diagnostic software and electrical test equipment, and follow manufacturer service procedures.
• Working knowledge of heavy-duty brakes, steering, suspension.
• CDL-A or CDL, or ability to obtain
• Valid driver's license and ability to meet company requirements for driving, including passing a DOT physical exam and holding a valid DOT medical card. CDL A or CDL B are a plus.
• ASME-BASE medium and heavy truck certifications or equivalent experience, preferrred
• OEM diagnostic experience, preferred
• Hydraulic and PTO experience, preferred
• Ablity to perform DOT Annual Inspections
• Qualified to perform Air Brake service and Inspections, preferred
• Positive, team oriented attitude
• Self-starting work ethic a plus