Diesel Mechanic – Heavy-Duty Tech, Career Growth & Benefits

20 Saia Motor Freight Line LLC; St. Louis (MO); On-site; USD 48,000 - 55,000; Full time

Job summary

SAIA Motor Freight Line LLC is seeking a skilled Diesel Mechanic in Missouri to perform maintenance, diagnostics, and repair on heavy trucks. You will work on class 6–8 tractors, diagnose issues, and assist in replacements of engines and transmissions while ensuring safety and compliance with regulations.

The role requires 2+ years of diesel experience and proficiency with diagnostic software, plus the ability to work with a team in a fast-paced environment.

Qualifications

• Minimum 18 years old.
• High school diploma or GED.
• Authorized to work in the United States.
• Must provide and maintain personal maintenance tools.
• Read, write, communicate and comprehend English to perform tasks and review documents.

Responsibilities

• Repairs and maintains systems and parts on class 6, 7, and 8 powered tractors.
• Diagnoses failures and repairs mechanical, electrical, and system components.
• Uses hydraulic jacks to access underneath vehicles.
• Assists in replacing engines, transmissions, differentials, and springs.
• Troubleshoots heavy-duty engines, braking, electrical, and exhaust systems.
• Documents repairs, inspections, and maintenance tasks.
• Collaborates with partners for training on complex repairs.
• Tests vehicles after repairs to ensure proper function.

Skills

Diesel mechanic experience

Education

High school diploma or GED

Tools

Diagnostic software proficiency

Job description

SAIA Motor Freight Line LLC is seeking a skilled Diesel Mechanic in Missouri to perform maintenance, diagnostics, and repair on heavy trucks. You will work on class 6–8 tractors, diagnose issues, and assist in replacements of engines and transmissions while ensuring safety and compliance with regulations.

The role requires 2+ years of diesel experience and proficiency with diagnostic software, plus the ability to work with a team in a fast-paced environment.