Diesel Mechanic

County-Materials-Family-of-Companies; Marathon City (WI); On-site; USD 52,000 - 76,000; Full time

Job summary

County Materials in Marathon, Wisconsin is seeking a Diesel Technician to service diesel engines and heavy-duty equipment. This role focuses on maintenance, diagnostics, and repairs to ensure safe, DOT-compliant operations of fleet and assets.

The ideal candidate will perform PMs, troubleshoot diesel systems, read manuals and schematics, and document repairs while maintaining a clean, safe workspace and supporting special projects.

Qualifications

• High School Diploma or Equivalent.
• Minimum of 2 years’ experience in diesel mechanics.
• Valid driver's license required; CDL preferred.
• Pro-active, multi-tasking, team player with a positive attitude.
• Experience with hydraulic, mechanical, and welding work.

Responsibilities

• Troubleshoot, diagnose, and repair diesel engines, trucks, and heavy-duty equipment.
• Perform mechanical, hydraulic, and pneumatic repairs as needed.
• Complete preventative maintenance (PMs) and DOT inspections.
• Respond to emergency and unscheduled equipment breakdowns to reduce downtime.
• Read and interpret technical manuals, schematics, and service documentation.
• Operate, maintain, and inspect shop tools and equipment.
• Follow all safety procedures, regulatory requirements, and quality standards.
• Accurately document repairs, inspections, and maintenance activities.
• Support team operations and assist with special projects or tasks.
• Use hand and power tools, material handling equipment, welders, and cutting torches.
• Maintain a clean, organized, and safe work area.

Skills

Diesel mechanics experience

Welding

Hydraulic systems

Mechanical troubleshooting

Driver's license

CDL preferred

Education

High School Diploma or Equivalent

Tools

Shop tools

Diagnostic tools

Hydraulic testing equipment

Job description

We’re hiring a Diesel Technician to join County Materials in Marathon, Wisconsin

Job Summary:

We are seeking a Mechanical Technician with strong experience in diesel engines and heavy-duty equipment to maintain, troubleshoot, and repair trucks and large machinery. This role is critical to ensuring safe, reliable, and DOT-compliant operation of fleet and equipment assets.

The Mechanical Technician performs mechanical, hydraulic, pneumatic, and engine diagnostics and repairs, completes preventative maintenance and DOT inspections, and responds to emergency or unscheduled breakdowns to minimize downtime. By interpreting technical manuals, documenting repairs, maintaining clean work environments, and supporting special projects, this position plays a key role in maintaining production schedules and upholding safety and quality standards.

Job Duties & Responsibilities:

• Troubleshoot, diagnose, and repair diesel engines, trucks, and heavy-duty equipment
• Perform mechanical, hydraulic, and pneumatic repairs as needed
• Complete preventative maintenance (PMs) and DOT inspections
• Respond to emergency and unscheduled equipment breakdowns to reduce downtime
• Read and interpret technical manuals, schematics, and service documentation
• Operate, maintain, and inspect shop tools and equipment
• Follow all safety procedures, regulatory requirements, and quality standards
• Accurately document repairs, inspections, and maintenance activities
• Support team operations and assist with special projects or tasks
• Use hand and power tools, material handling equipment, welders, and cutting torches
• Maintain a clean, organized, and safe work area
• Perform other related duties as assigned

COUNTY Core Competencies:

The expected behaviors of all COUNTY team members that align with Our Values and Our Commitments:

• Integrity & Organizational Awareness
• Customer First Focus
• Results Driven Orientation
• Teamwork, Safety & Collaboration
• Problem Solving & Decision Making
• Creativity & Innovation

Job-Based Competencies:

• Diesel, Mechanical, & Pneumatic Systems Knowledge
• Diagnostics & Troubleshooting
• Preventative Maintenance & Reliability
• Work Planning & Documentation
• Tool Usage
• Welding
• Communication
• Attention to Detail

Experience & Qualifications:

(Required or Preferred)

• High School Diploma or Equivalent
• Minimum of 2 years’ experience in diesel mechanics.
• Pro-active, multi-tasked, self-motivated team player and positive attitude.
• Strong hydraulic, mechanical, welding experience
• A valid driver's license and good driving record is required.
• CDL preferred

Work Environment:

• Work is typically performed in an Indoor, Outdoor, Field environment including extreme hot or cold temperature in confined areas
• Exposure may include: Noise, weather, machinery, chemicals
• Travel required as needed
• Typical work hours/shifts: 1st shift, overtime expectations mandatory

Physical & Work Expectations:

An individual in this position must be able to successfully perform the essential duties and responsibilities listed above. Reasonable accommodation may be made to enable individuals with disabilities to perform the essential functions of this position.

• Frequent standing, walking, bending, reaching, or handling materials/equipment.
• Occasional climbing, kneeling, or lifting/moving up to 75 pounds.
• Follow detailed instructions, communicate effectively, and safely perform job duties.
• May require the operation of specific tools, equipment, or vehicles associated with the position.

Noise Level:

How much noise is typical for the work environment of this job?

Loud Noise: (Examples: normal shop conditions)

Safety Equipment:

Required safety equipment: Steel toe boots, hard hat, safety glasses, safety gloves, welding mask

Where and when used: at all times while working