Diesel Fleet Technician - Diagnostics & Heavy Repair

Marquis Inc; Hennepin (IL); On-site; USD 41,000 - 55,000; Full time

Benefits offered by this job

HDHP / HSA

PPO / FSA

Dental

Vision

Life/AD&D

Disability

401(k)

PTO

Paid holidays

Job summary

Marquis, Inc in Hennepin, Illinois, is seeking a Fleet Maintenance Technician to diagnose, repair, and maintain semi-trucks, trailers, and heavy equipment. You will work with diesel engines, hydraulics, and electrical systems, using diagnostic tools to troubleshoot and ensure reliability.

This role requires hands-on repair, field service when needed, and meticulous record-keeping. A diesel technology background and experience with heavy equipment are preferred; CDL is a plus.

Qualifications

• Degree or equivalent in Diesel Technology, Heavy Equipment, or Automotive Repair.
• Experience working on semi-trucks, heavy equipment, or construction/off-road machinery.
• CDL preferred or willingness to obtain.
• ASE Diesel Certification or equivalent is a plus.
• Strong understanding of diesel engines, hydraulics and electrical systems.
• Proficiency with diagnostic tools, software and repair equipment.
• Ability to read and interpret manuals and schematics.
• Strong problem-solving skills and attention to detail.

Responsibilities

• Perform diagnostics and repairs on semi-trucks, trailers, and heavy equipment.
• Inspect, troubleshoot, and repair diesel engines, transmissions, braking, steering and hydraulics.
• Conduct preventative maintenance to ensure reliability and minimize downtime.
• Utilize diagnostic software and tools to identify mechanical and electrical issues.
• Repair and maintain pumps, cylinders, valves and other hydraulic components.
• Test equipment and vehicles to verify performance and safety after repairs.
• Maintain service records, inspection reports, and maintenance logs.
• Follow inspection procedures and safety protocols.
• Manage parts inventory and shop organization.
• Perform field service repairs as needed in varying outdoor conditions.

Skills

Diesel technology knowledge

Diagnostics tools proficiency

Problem-solving

Attention to detail

Communication & organization

Education

Degree, diploma, or equivalent in Diesel Technology, Heavy Equipment, or Automotive Repair

Tools

Diagnostic tools

Job description

Marquis, Inc in Hennepin, Illinois, is seeking a Fleet Maintenance Technician to diagnose, repair, and maintain semi-trucks, trailers, and heavy equipment. You will work with diesel engines, hydraulics, and electrical systems, using diagnostic tools to troubleshoot and ensure reliability.

This role requires hands-on repair, field service when needed, and meticulous record-keeping. A diesel technology background and experience with heavy equipment are preferred; CDL is a plus.