Fleet Diesel Mechanic

Bosun; Gillette (WY); On-site; USD 41,000 - 55,000; Full time

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

Job summary

Bosun in Gillette, WY is seeking an experienced Fleet Diesel Mechanic to diagnose, repair, and maintain our fleet of diesel trucks, semis, trailers, and support vehicles. This hands-on role emphasizes safety, quality workmanship, and keeping equipment on the road.

The ideal candidate has 2+ years of diesel repair experience, strong diagnostic skills, and the ability to read manuals and wiring diagrams. Overtime is available; schedule is Monday–Friday with regular overtime.

Qualifications

• 2+ years repairing diesel trucks or fleet vehicles.
• Strong diesel mechanical knowledge and diagnostic ability.
• Ability to read service manuals, schematics, and wiring diagrams.
• Attention to detail and commitment to completing repairs correctly.
• Ability to work independently and as part of a shop team.
• Must supply and maintain personal mechanic hand tools.
• Must be able to meet company drug and alcohol testing requirements.

Responsibilities

• Diagnose, troubleshoot, maintain, and repair diesel trucks, semi-trucks, trailers, and support vehicles.
• Work on fleet equipment including Peterbilt, Kenworth, Freightliner, Western Star, and similar trucks.
• Diagnose and repair: diesel engines, transmissions and drivetrains, electrical systems, air and brake systems, steering and suspension components, fuel systems, hydraulic systems.
• Perform repairs and maintenance on smaller support equipment as needed.
• Use diagnostic equipment, service manuals, schematics, and wiring diagrams to identify and resolve mechanical and electrical issues.

Skills

Diesel truck repair

Diagnostics

Schematics reading

Teamwork

Tools

Diagnostic software

Maintenance systems

Job description

Fleet Diesel Mechanic

Location: Gillette, WY
Pay: $30–$40 per hour, based on experience + Overtime
Schedule: Monday–Friday | 5:00 AM – 5:00 PM
Benefits: Medical, Dental, Vision

About the Role

On behalf of our client, we are seeking an experienced Fleet Diesel Mechanic to join a growing team in Gillette, Wyoming. This is a hands-on shop position focused on diagnosing, repairing, and maintaining the company's fleet of diesel trucks, semi-trucks, trailers, and support vehicles.

The goal is simple: when a truck leaves the shop, it needs to be safe, reliable, and ready to work. You'll be responsible for troubleshooting mechanical issues, completing repairs, and staying ahead of preventative maintenance to help minimize downtime across the fleet.

This position is primarily focused on diesel trucks and fleet vehicles rather than large heavy construction equipment. There may be opportunities to work on smaller support equipment such as pumps, light plants, forklifts, and similar equipment as needed.

We're looking for a strong mechanic first. Previous leadership experience is not required. For someone interested in growing professionally, there may be opportunities to take on additional leadership responsibilities over time.

Key Responsibilities

Diesel Truck & Fleet Maintenance

• Diagnose, troubleshoot, maintain, and repair diesel trucks, semi-trucks, trailers, and support vehicles.
• Work on fleet equipment including Peterbilt, Kenworth, Freightliner, Western Star, and similar trucks.
• Diagnose and repair:
  • Diesel engines
  • Transmissions and drivetrains
  • Electrical systems
  • Air and brake systems
  • Steering and suspension components
  • Fuel systems
  • Hydraulic systems
• Perform repairs and maintenance on smaller support equipment such as pumps, light plants, forklifts, and similar equipment as needed.
• Use diagnostic equipment, service manuals, schematics, and wiring diagrams to identify and resolve mechanical and electrical issues.

Preventative Maintenance & Inspections

• Perform scheduled preventative maintenance to keep fleet vehicles reliable and road-ready.
• Complete oil and fluid changes, filter replacements, lubrication, and routine services.
• Perform vehicle and equipment inspections.
• Complete or support DOT inspections and required fleet maintenance.
• Identify potential problems before they result in breakdowns or unnecessary downtime.
• Ensure repairs are completed thoroughly and with a strong attention to quality.

Shop & Safety Responsibilities

• Accurately document repairs, inspections, parts used, and preventative maintenance completed.
• Assist with parts identification and ordering as needed.
• Maintain a clean, safe, and organized work area.
• Follow company safety procedures, including proper PPE and lockout/tagout practices.
• Work collaboratively with other mechanics and operations personnel to prioritize repairs and keep the fleet moving.
• Participate in required safety meetings and training.
• Provide and maintain personal mechanic hand tools required to perform the job.

Required Qualifications

• 2+ years of professional experience repairing diesel trucks, semi-trucks, fleet vehicles, or similar equipment; 3–5+ years preferred
• Strong diesel mechanical knowledge and diagnostic ability
• Experience troubleshooting and repairing diesel engines, transmissions, electrical systems, brakes, steering, suspension, fuel systems, and/or hydraulics
• Ability to read and interpret service manuals, schematics, and wiring diagrams
• Strong mechanical troubleshooting and problem-solving skills
• Attention to detail and commitment to completing repairs correctly
• Ability to work independently and as part of a shop team
• Ability to prioritize work in a fast-paced maintenance environment
• Must supply and maintain personal mechanic hand tools
• Must be able to meet company drug and alcohol testing requirements

Preferred Qualifications

• Experience working on Peterbilt, Kenworth, Freightliner, Western Star, Cummins, Detroit, CAT, or similar trucks and diesel engines
• Technical training in diesel technology, medium/heavy truck repair, automotive technology, or a related field
• CDL
• ASE Medium/Heavy Truck certifications
• Experience performing DOT inspections
• Experience using electronic diagnostic software and maintenance/work-order systems
• Basic welding and fabrication experience
• Interest in mentoring others or growing into future leadership responsibilities

Equivalent hands-on work experience may be considered in place of formal certifications or technical education.

Work Environment

• Work is performed primarily in a maintenance shop with occasional outdoor work as needed.
• Regular exposure to diesel equipment, noise, vibration, dust, grease, fumes, and varying temperatures.
• Monday–Friday schedule with regular overtime.
• This is a hands-on mechanical position requiring regular work around trucks, trailers, tools, and shop equipment.

Physical Requirements

• Ability to lift and carry 50–75 lbs regularly and up to 100 lbs with assistance
• Frequent standing, walking, bending, kneeling, climbing, reaching, and working around vehicles and equipment
• Ability to work in confined spaces and awkward positions when completing repairs
• Manual dexterity to safely operate hand tools, power tools, and diagnostic equipment

Why Join Our Team

• $30–$40/hour based on experience
• Regular overtime opportunities
• Medical, dental, and vision benefits
• Monday–Friday schedule
• Stable opportunity with a growing company
• Opportunity to expand your skills and grow into additional responsibilities over time
• Team environment focused on safety, quality workmanship, and keeping equipment running

Posting Statement

All qualified applicants will receive consideration for employment without regard to race, color, religion, religious creed, sex, national origin, ancestry, age, physical or mental disability, medical condition, genetic information, military and veteran status, marital status, pregnancy, gender, gender expression, gender identity, sexual orientation, or any other characteristic protected by local law, regulation, or ordinance.