Journeyman Diesel Mechanic

Location: Billings, Montana
Position: Journeyman Diesel Mechanic
Company: I-State Truck Center
Schedule: Wednesday – Saturday

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 proudly 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 looking to apply their expertise and continue growing their careers.

The ideal candidate has proven heavy-duty diesel truck experience and a strong background in diagnostics, repair, and preventive maintenance. This role offers competitive wages, a consistent Wednesday–Saturday schedule, and long-term stability within a growing organization.

Key Responsibilities

• Diagnose and Repair: Troubleshoot 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).
• Preventive Maintenance: Perform routine maintenance including oil changes, filter replacements, brake adjustments, tire inspections, and chassis lubrication to ensure reliability and regulatory compliance.
• Component Repairs: Repair or replace critical components such as diesel engines, transmissions, differentials, turbochargers, and braking systems.
• Welding and Fabrication: Perform minor welding, cutting, or fabrication work to repair or modify frames and components as needed.
• Documentation: Complete accurate service reports, document parts usage, and record maintenance activities for warranty, billing, DOT compliance, and inventory tracking.
• Customer Interaction: Communicate with drivers and fleet managers regarding repairs, recommendations, and service outcomes.
• Safety Compliance: Follow OSHA, DOT, manufacturer, and company safety guidelines while maintaining a clean and organized work environment.
• Tool & Equipment Management: Maintain shop tools, diagnostic equipment, and service areas to ensure operational readiness.

Qualifications

• Education: High school diploma or equivalent; technical diploma or certification in diesel or heavy-duty truck repair preferred.
• Experience:
  • 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
• Technical Skills:
  • 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
• Soft Skills:
  • Strong problem-solving ability and attention to detail
  • Effective communication and customer service skills
• Certifications (Preferred):
  • Manufacturer training (Cummins, Detroit Diesel, Paccar) or ASE Heavy-Duty certifications (T2–T8)
• Physical Requirements:
  • Ability to lift 50–75 lbs., work under trucks, and perform duties in various shop conditions
• License:
  • Valid driver’s license required
  • CDL strongly preferred

Employee Benefits

• Competitive wages – be paid your worth
• 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

This job description is not designed to cover a comprehensive listing of activities, duties, or responsibilities. Duties and responsibilities may change at any time.

Interstate Companies is an Equal Opportunity Employer.

Military Friendly Hiring.

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