Job Summary Diesel Mechanic is a critical role in maintaining the functionality, safety, and reliability of our fleet of service vehicles and equipment used in oil and gas operations. These individuals will inspect, troubleshoot, repair, and maintain diesel-powered vehicles and equipment, ensuring all work meets industry and company standards. Advancement through mechanic levels is based on experience, certification, technical ability, and leadership skills.

Essential Functions & Primary Responsibilities:

Conduct diagnostics on diesel-powered vehicles and equipment using manual and computerized methods. Repair or replace engines, transmissions, brakes, steering systems, lighting, electrical wiring, suspension, and hydraulics. Perform preventive maintenance and scheduled servicing of vehicles. Execute field repairs and provide remote troubleshooting support to field crews. Respond promptly to emergency service calls. Maintain shop and worksite cleanliness, order, and safety. Accurately document repairs, diagnostics, and maintenance activities in system. Adhere to inspection and compliance checklists for vehicle readiness. Maintain parts inventory, submit requisitions, and report usage. Collaborate with field teams and internal departments to prioritize repairs and ensure uptime. Provide timely updates on repair timelines and equipment availability to internal stakeholders.

Internal Customer Service & Field Support Expectations:

Serve as a dependable technical resource for operations and field personnel. Communicate equipment status, delays, and recommendations clearly and respectfully. Prioritize repair requests based on field needs and operational urgency. Work closely with dispatchers, supervisors, and drivers to coordinate equipment readiness. Ensure minimal disruption to field operations through proactive communication and planning. Support internal customers with professionalism, urgency, and a team-first attitude.

Goals & Expectations:

Ensure all vehicles and equipment are maintained in a safe and operational condition Minimize downtime by executing timely and effective repairs Uphold standards of safety, professionalism, and communication Continue professional development and attain relevant certifications Contribute to a clean, organized, and safety-conscious work environment Ensure safety and regulatory compliance across all maintenance operations. Continually improve diagnostic and repair efficiency. Contribute to a positive and collaborative team environment. Support company goals of operational excellence and field readiness. Other Duties Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice. Expectations & Commitment At CNC Oilfield Services, we are committed to safety, professionalism, accountability, and operational excellence across every role. We expect all employees whether in the field, office, or leadership, to uphold a high standard of responsibility in how they perform their duties and represent the company. This includes maintaining a strong safety mindset, following company policies and regulatory requirements, communicating effectively, and supporting our mission to deliver high-quality service. Every team member plays a vital role in ensuring a safe, compliant, and customer-focused work environment.

Skills, Licenses, and Education Required Qualifications:

Degree/diploma in mechanical or automotive engineering (preferred) ASE Diesel Certification (advantageous); Master Technician for senior levels Air Brake and Air Conditioning Certifications CDL or Chauffeur's license preferred

Knowledge, Skills & Abilities:

Proficiency in diesel engine diagnostics and repairs Strong knowledge of hydraulic, pneumatic, and electrical systems Computer literacy for maintenance software Possess own tools and maintain them in safe condition

Professional & Interpersonal Skills:

Strong verbal and written communication Teamwork and collaboration across departments Excellent problem-solving and analytical thinking Ability to work under pressure and meet deadlines Respectful, positive demeanor with peers and supervisors Commitment to professionalism, integrity, and service

Work Environment & Physical Requirements:

Ability to lift 75-150 pounds regularly Must be able to stand, crouch, kneel, and bend for long periods Work indoors and outdoors in varying weather conditions Exposure to noise, grease, dust, and heavy equipment Must be willing to work flexible hours, including callouts and overtime

Operational & Safety Requirements:

Follow all OSHA, DOT, and company safety policies. Wear appropriate PPE in all designated areas. Maintain awareness of environmental, fire, and chemical safety hazards. Use lockout/tagout procedures and safety equipment correctly. Ensure all repairs are completed to safety and manufacturer standards. Participate in safety meetings and contribute to a culture of accountability.

Diesel Mechanic Levels:

Level 1

•Entry-Level Diesel Mechanic

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Industry Experience:

0-3 years Learning workflow, shop processes, and company systems Assists with basic diagnostics and maintenance under supervision Develops foundational skills and safety awareness

Required Certifications:

2

Key Skills:

12V wiring diagnostics and repair Air brake diagnostics Fluid changes, PMs, minor repairs Assist in inspections and documentation Level 2

•Mid-Level Diesel Mechanic

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Industry Experience:

4-6 years Performs most general repairs with moderate independence Begins complex diagnostics and repairs Supports senior mechanics and helps train entry-level techs

Required Certifications:

5

Key Skills:

Troubleshoot and repair diesel and gas engines Hydraulics/pneumatics, pumps, wiring Read/interpret service manuals, diagrams Level 3

•Senior Diesel Mechanic

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Industry Experience:

7-9 years Expert-level diagnostic and repair skills Performs in-frame overhauls and rebuilds Leads inspections, paperwork, and field calls Mentors junior mechanics

Required Certifications:

7

Key Skills:

DEF system diagnostics Equipment repair estimates and parts requisitions Repair of semi-fleets and light-duty trucks Communication with shop leadership Level 4

•Master Diesel Mechanic

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Industry Experience:

10+ years Fully autonomous, leads projects and teams Certified ASE Master Technician Specializes in high-level diagnostics and system repairs Acts as field support lead and technical expert

Required Certifications:

ASE Master Technician Key Skills:

Master-level use of diagnostic software Transmission, engine, and rear-end rebuilds Full-scope project planning and repair documentation Exceptional troubleshooting and leadership skills Equal Opportunity Statement CNC Oilfield is an Equal Opportunity Employer. We encourage all qualified individuals to apply. We are committed to providing a workplace free from discrimination and promoting a culture of inclusion and safety.