Journeyman Diesel Mechanic

Interstate Power Systems; Billings (MT); On-site; USD 55,000 - 85,000; Full time

Benefits offered by this job

Competitive wages

Uniforms provided

Tool program

Tuition assistance

Medical, dental, vision coverage

PTO accrual from day one

Holidays: 6 + 2 floating

401(k) with match

Disability insurance

Life insurance

Job summary

I-State Truck Center in Billings, MT is seeking a Journeyman Diesel Mechanic to diagnose and repair heavy-duty diesel trucks. The role requires experience with major brands, strong diagnostics skills, and a commitment to quality maintenance.

Responsibilities include preventive maintenance, component repairs, welding, documentation, and clear communication with drivers and fleet managers. Safety compliance and tool management are essential in this fast-paced shop environment.

Qualifications

• 2-5+ years of hands-on heavy-duty diesel truck experience.
• Experience with Freightliner, Kenworth, Peterbilt, Volvo, Mack or similar.
• Education: High school diploma or equivalent; technical diploma preferred.
• Certifications: ASE Heavy-Duty or manufacturer training preferred.

Responsibilities

• Diagnose and repair heavy-duty diesel truck systems using advanced diagnostic tools.
• Perform preventive maintenance including oil changes and brake adjustments.
• Repair or replace engines, transmissions, differentials, turbochargers, braking systems.
• Welding and fabrication as needed.
• Document service reports, parts usage, and warranty records.
• Communicate with drivers and fleet managers regarding repairs and outcomes.
• Follow safety guidelines and maintain organized workspace.
• Manage tools and diagnostic equipment.

Skills

2-5+ years diesel experience

Diesel diagnostics

Electrical systems

Reading wiring diagrams

Education

High school diploma or equivalent

Technical diesel repair cert (preferred)

Tools

Cummins Insite

Detroit Diesel Diagnostic Link

Diagnostic software

Job description

SaturdayI-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.

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

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.

Equal Opportunity Employer - minorities/females/veterans/individuals with disabilities/sexual orientation/gender identity.