Journeyman Diesel Mechanic

About the Role

I-State Truck Center is a leading provider of heavy-duty truck sales, parts, and service, specializing in Freightliner, Western Star, and Thomas Built Bus products. We support commercial fleets, owner-operators, and businesses across the region. Our Billings, Montana location offers a fast-paced, professional shop environment for skilled diesel technicians.

Responsibilities

• Diagnose and repair complex mechanical, hydraulic, electrical, and electronic systems on heavy-duty diesel trucks using advanced diagnostic tools, schematics, and technical manuals (e.g., Cummins Insite, Detroit Diesel Diagnostic Link).
• Perform preventive maintenance including oil changes, filter replacements, brake adjustments, tire inspections, and chassis lubrication to ensure reliability and regulatory compliance.
• Repair or replace critical components such as diesel engines, transmissions, differentials, turbochargers, and braking systems.
• Perform minor welding, cutting, or fabrication work to repair or modify frames and components as needed.
• Complete accurate service reports, document parts usage, and record maintenance activities for warranty, billing, DOT compliance, and inventory tracking.
• Communicate with drivers and fleet managers regarding repairs, recommendations, and service outcomes.
• Follow OSHA, DOT, manufacturer, and company safety guidelines while maintaining a clean and organized work environment.
• Maintain shop tools, diagnostic equipment, and service areas to ensure operational readiness.

Qualifications

• High school diploma or equivalent; technical diploma or certification in diesel or heavy-duty truck repair preferred.
• 2-5+ years of hands-on heavy-duty diesel truck experience is required. Experience with brands such as Freightliner, Kenworth, Peterbilt, Volvo, Mack, or similar.
• Strong knowledge of diesel engines, electrical systems, hydraulics, and ECM diagnostics.
• Proficiency with diagnostic software and hand/power tools.
• Ability to read and interpret technical manuals, wiring diagrams, and schematics.
• Strong problem-solving ability and attention to detail.
• Effective communication and customer service skills.
• Manufacturer training (Cummins, Detroit Diesel, Paccar) or ASE Heavy-Duty certifications (T2-T8) preferred.
• Ability to lift 50-75 lbs., work under trucks, and perform duties in various shop conditions.
• Valid driver's license required; CDL strongly preferred.

Benefits

• Competitive wages.
• Uniforms provided and professionally cleaned.
• Tool program available.
• Tuition assistance for ongoing education and career growth.
• Medical, dental, and vision coverage starting the first of the month following hire.
• PTO accrual starting day one.
• 6 paid holidays plus 2 floating holidays.
• 401(k) with company match.
• Company-paid short-term and long-term disability.
• Company-paid life insurance.
• Healthiest You virtual healthcare.
• PPE reimbursement (safety glasses and safety boots).
• Pet insurance.
• Employee discounts on products and services.
• Employee Assistance Program (EAP) - free 24/7 access.
• Paid health and wellness screening.

Schedule

Wednesday–Saturday.

Pay

Competitive wages based on experience and skill level.