Jobs › Werner Enterprises

Diesel Mechanic

Werner Enterprises · Joliet, IL · $26.20–$34.93 an hour · Full time

Posted Sep 14, 2026 · We last checked this listing on Oct 6, 2026

Apply at Werner Enterprises

Likely interview questions for this role

Written from this job description, not a generic list. Each one notes what the interviewer is really checking.

About your past

How do you document a repair on a work order so the next person understands what was done?

What they are checking: Whether they write clear records, which matter for safety, warranty and DOT compliance.

Tell me about a time you learned to fix something new.

What they are checking: Whether they keep learning as truck systems and electronics change.

What would you do

You find a safety issue that wasn't on the work order, but the driver needs to leave. What do you do?

What they are checking: Whether they put safety first and communicate with the shop lead rather than letting an unsafe truck go.

A driver is frustrated that their truck is taking too long. How do you handle it?

What they are checking: Whether they can give honest updates and treat drivers as customers, which the posting mentions.

About the work

A tractor comes in with a check engine light and low power. Walk me through your diagnosis.

What they are checking: Whether they use diagnostic tools and a logical process instead of replacing parts until the problem goes away.

How do you troubleshoot an air brake system that's losing pressure?

What they are checking: Whether they know the air system, from compressor and governor to drier and valves, and can find leaks safely.

Tell me about the hardest electrical problem you've fixed on a truck.

What they are checking: Whether they can use a volt-ohm meter and wiring diagrams to track down real electrical faults.

What's in your toolbox right now?

What they are checking: Whether they own the advanced hand tools, impact and meter the posting requires and have real shop experience.

Walk me through a preventive maintenance inspection on a tractor.

What they are checking: Whether they know what a thorough PM covers and why it prevents breakdowns on the road.

How comfortable are you driving a tractor in and around the shop yard?

What they are checking: Whether they can safely move equipment, which is part of the job.

Practice this interview out loud.

Offer builds a real interview for this exact role at Werner Enterprises from your resume and this job description, asks the questions one at a time, and tells you what landed. The first one is free.

Practice this out loud

The full job description

As published by Werner Enterprises.

The main purpose of this position is to diagnose and repair all systems on a diesel tractor to include, but not limited to: engine, transmission, front axle, rear axle, suspension, air conditioning and heating, electrical, air brakes and 5th wheel systems. Must have advanced set of hand tools, rollaway toolbox, ½ drive impact and sockets, digital volt/ohm/amp meter. The job functions listed below represent the essential job duties and responsibilities of the above-listed position. • Diagnose and repair mechanical and electrical problems on diesel tractors as indicated on work orders or discovered during inspection. Repairs will be made to the following: minor and major electrical, engine electronic controls, clutch replacement and adjustment, differential replacement, exhaust repairs, u-joints, cab interior, wheel seals, brakes, air bags and leveling valve, shocks, thermostats, fan hub, air brake valves, air lines, air governor, air compressor, air drier, radiator, hoses, belts, alternators, batteries, lights, kingpins, shackle pins and bushings, drag link and tie rod ends, 5th wheel, oxyacetylene operation, preventative maintenance, and heating and air conditioning. Document completed repairs on a work order. • Operate tractor. This will include locating tractor and driving it into the shop, then parking equipment on the lot when repairs are completed. • Customer service. This includes addressing and advising drivers on technical questions concerning their tractor. • Clean work area. This will include cleaning floors, storing and cleaning shop and personal tools and equipment. Trash removal. • Procure parts. This will include getting parts and materials from the parts room to make repairs to tractors. • Perform other duties as assigned by supervisory personnel. • Training. This will include training less experienced mechanics using hands on method and answering technical questions as they arise. 
The expected starting pay range for this position is $26.20 - $34.93 per hour. Offers determined based on experience, skills, and qualifications.
 
We know benefits are critical and we are committed to offering comprehensive and affordable options for you and your loved ones. This position is eligible for benefits, which include medical, dental and vision plans. We also offer a 401(k) plan, stock purchase plan, paid time off, life insurance, disability plans and other optional supplemental coverage. Werner Enterprises provides equal employment opportunities to all employees and applicants for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, marital status, genetic information or veteran status or other status protected by law. We encourage applicants of all ages as we do not discriminate on the basis of an applicant's age. By clicking “Submit” you are expressly consenting to our Privacy Policy (available at https://www.werner.com/privacy-policy/ ) and to Werner Enterprises, Inc., its representatives, and affiliates (“Werner”) contacting you about your inquiry, and that Werner may collect sensitive information about you to consider your employment as explained further in our Privacy Policy. All information collected will be handled and retained as explained in the Privacy Policy.

Apply at Werner Enterprises

More diesel mechanic roles