Diesel Truck Mechanic

Job Title: Diesel Truck and Trailer Mechanic
Job Description
This role focuses on inspecting, diagnosing, and repairing diesel trucks, trailers, and related equipment to ensure they operate safely and efficiently. You will perform comprehensive mechanical and electrical work, conduct preventative maintenance, and use diagnostic tools to resolve complex issues. The position requires strong technical skills, attention to detail, and the ability to work both independently and as part of a team in a busy shop environment.
Responsibilities

• Perform thorough inspections of diesel engines, trucks, trailers, and related equipment to identify mechanical and electrical issues.
• Diagnose and repair problems related to engines, transmissions, brakes, suspension systems, electrical components, and hydraulic systems.
• Conduct routine preventative maintenance, including oil changes, filter replacements, brake adjustments, lubrication, and system checks.
• Use diagnostic software, diagnostic equipment, and hand tools to troubleshoot and resolve complex mechanical and electrical issues.
• Repair or replace defective parts such as fuel systems, axles, hydraulic components, air brake components, and pneumatic systems.
• Carry out trailer-specific maintenance and repairs to ensure trailers remain safe, roadworthy, and compliant with relevant regulations.
• Perform DOT inspections and ensure all work complies with applicable safety and inspection standards.
• Maintain accurate records of all repairs, inspections, and maintenance performed, including parts used and work completed.
• Operate shop equipment and machinery safely, including lifts, forklifts, and power tools, following all safety procedures.
• Keep work areas clean, organized, and free of hazards to promote a safe and efficient shop environment.
• Collaborate with team members and supervisors to prioritize work, complete assignments efficiently, and meet deadlines.
• Work independently when required, making sound decisions regarding diagnostics and repairs.
• Perform welding tasks as needed for trailer and equipment repairs.
• Lift and move heavy equipment and parts (typically up to 50-75 pounds) as required during repairs.
• Support fleet maintenance activities for trucks, trailers, and heavy equipment, including farm machinery, Caterpillar equipment, and RV trailers when applicable.
• Follow company policies, safety guidelines, and quality standards in all aspects of work.
• Work flexible hours, including overtime when needed, to support shop operations across multiple shifts.

Essential Skills

• Proven experience as a Diesel Technician, Mechanic, or in a similar role working with diesel trucks and trailers.
• Strong knowledge of diesel engines, including diagnosis and repair of engine-related issues.
• Strong understanding of electrical systems and the ability to troubleshoot and repair electrical components.
• Experience working with hydraulic components and systems on trucks and trailers.
• Ability to diagnose and repair issues in engines, transmissions, brakes, suspension systems, and air brake systems.
• Proficiency in using diagnostic tools, hand tools, and shop equipment for troubleshooting and repairs.
• Understanding of preventative maintenance practices and inspection procedures for diesel trucks and trailers.
• Ability to read and interpret technical manuals, schematics, and work orders accurately.
• Valid driver's license.
• Ability to lift heavy equipment and parts (typically 50-75 pounds) and work in physically demanding conditions.
• Strong attention to detail with a commitment to safety and high-quality workmanship.
• Excellent problem-solving and troubleshooting skills.
• Ability to work independently and as part of a team in a fast-paced shop environment.
• Willingness to work flexible hours, including overtime when required.
• Ability to work independently and safely, following all safety protocols and procedures.
• Ability to be a dependable team player, contributing positively to the overall shop operations.

Additional Skills & Qualifications

• Certification from a technical school or ASE certifications (preferred but not required).
• Some welding experience for trailer and equipment repair.
• Experience with diesel maintenance, mechanical repair, and preventive maintenance on trucks and trailers.
• Familiarity with DOT inspection requirements and procedures.
• Experience working with hydraulics, pneumatics, and heavy equipment systems.
• Familiarity with farm machinery, Caterpillar equipment, and RV trailers is a plus.
• Experience operating heavy equipment is beneficial.
• Experience working with fleet maintenance operations is an advantage.
• Comfort using major shop tools and diagnostic equipment, which will be provided.
• Strong mechanical aptitude and comfort working with engines, transmissions, brakes, and suspension components.
• Ability to use hand tools safely and effectively in a shop environment.
• Strong organizational skills to maintain accurate records and keep work areas orderly.

Why Work Here?
You will join a well-equipped shop that provides major tools, diagnostic equipment, and the resources you need to perform your best work. The organization offers comprehensive benefits, structured training, and clear opportunities for career growth, allowing you to expand your technical skills and advance professionally. Multiple shifts and extended operating hours support a degree of scheduling flexibility, while tolls and essential equipment are provided so you can focus on quality workmanship. You will work with a supportive team that values safety, reliability, and continuous improvement.
Work Environment
This position is based in a shop environment that supports diesel truck, trailer, and heavy equipment maintenance. The facility operates Monday through Friday from 6:00 a.m. to midnight, with a first shift from 6:00 a.m. to 3:00 p.m. and a second shift from 3:00 p.m. to 12:00 a.m. The shop can be hot in the summers and cold in the winters, and the role involves physically demanding work, including lifting up to approximately 50 pounds and working around heavy equipment and machinery. You will regularly use diagnostic tools, hand tools, lifts, forklifts, power tools, and other major shop equipment, which are provided. The environment emphasizes safety, organization, and cleanliness, with an expectation that work areas remain clean and hazard-free while you perform maintenance and repairs on trucks, trailers, and related equipment.
Job Type & Location
This is a Contract to Hire position based out of Bridgeton, MO.
Pay and Benefits
The pay range for this position is $25.00 - $47.00/hr.
Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following:
• Medical, dental & vision
• Critical Illness, Accident, and Hospital
• 401(k) Retirement Plan - Pre-tax and Roth post-tax contributions available
• Life Insurance (Voluntary Life & AD&D for the employee and dependents)
• Short and long-term disability
• Health Spending Account (HSA)
• Transportation benefits
• Employee Assistance Program
• Time Off/Leave (PTO, Vacation or Sick Leave)
Workplace Type
This is a fully onsite position in Bridgeton,MO.
Application Deadline
This position is anticipated to close on Jun 11, 2026.

About Aerotek

We know that finding work is hard, and finding meaningful work is harder. Aerotek connects 180,000+ light industrial and skilled trades workers with 14,000+ employers each year, helping our workers navigate an evolving labor market and find jobs that meets their goals, skills and interests. Since 1983, we have provided a variety of career opportunities across North American industry - from short-term assignments at Fortune 500 companies where you can build your skills, to long-term opportunities where you can play a vital role solving for companies' construction, manufacturing and maintenance challenges. Our 1,500+ experienced recruiters across 250+ offices work relentlessly to put our workforce in a position to thrive. Let us rise to meet your challenges and put our people-are everything spirit to the test as your career continues to grow.


Aerotek offers weekly pay, employee benefits including medical, dental & vision, life insurance, health advocacy and employee assistance programs, a 401(k) plan, and employee discounts.


The company is an equal opportunity employer and will consider all applications without regards to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

San Francisco Fair Chance Ordinance:
Pursuant to the San Francisco Fair Chance Ordinance, for all positions located in the city and county of San Francisco, we will consider for employment qualified applicants with arrest and conviction records.

Massachusetts Lie Detector:
It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Use of Artificial Intelligence (AI):
We may use Artificial Intelligence (AI) to support parts of our hiring process, including sourcing, screening, and evaluating candidates. AI helps assess applications and qualifications, but final decisions are made by our hiring team. By applying, you acknowledge and agree that your application may be reviewed using AI tools.