Heavy Diesel Mechanic

Spencer Construction; Tucson (AZ); On-site; USD 60,000 - 85,000; Full time

Job summary

Spencer Trucking LLC in Marana, AZ is seeking a Heavy Diesel Mechanic to inspect, diagnose, maintain, and repair heavy-duty trucks and commercial trailers. You will perform preventative maintenance, troubleshoot mechanical and electrical issues, and respond to onsite and roadside breakdowns to minimize downtime.

The ideal candidate has 3+ years of hands-on experience (5+ preferred) with diesel engines and trailer systems, a valid DOT medical card and driver's license, and the ability to travel

Qualifications

• At least 3 years of hands-on heavy-duty truck and trailer repair experience; 5+ years preferred.
• Experience diagnosing and repairing mechanical and electrical issues.
• DOT Medical Card and valid driver’s license required.
• Welding, fabrication, mobile repair, and roadside service experience preferred.
• CDL is a plus but not required.

Responsibilities

• Diagnose, troubleshoot, repair, and maintain heavy-duty trucks and commercial trailers.
• Perform preventative maintenance, routine inspections, oil changes, filter replacements, and scheduled servicing.
• Diagnose and repair diesel engines, electrical systems, air brakes, suspension, steering, and drivetrain components.
• Diagnose and repair trailer brake systems, suspension, electrical systems, lighting, wheel ends, and structural components.
• Travel throughout Arizona to perform onsite repairs and respond to equipment breakdowns.
• Respond to roadside and emergency service calls as needed.
• Use diagnostic equipment and shop tools to identify mechanical and electrical issues.
• Maintain accurate maintenance records and document completed repairs.
• Communicate equipment conditions, repair needs, and maintenance concerns to drivers and management.
• Maintain a clean, organized, and safe work environment.
• Follow DOT requirements and safety procedures.

Skills

Heavy-duty truck repair

Trailer repair

Mechanical repairs

Electrical diagnostics

DOT Medical Card

Driver's license

Welding

Mobile repair

Roadside service

CDL (a plus)

Communication skills

Class 8 trucks

Tools

Diagnostic equipment

Shop tools

Job description

Heavy Diesel Mechanic

Company Overview

Spencer Trucking LLC operates a fleet of heavy-duty trucks, commercial trailers, and related equipment throughout the Southwest and beyond.

Our foundation is built on deep industry expertise, driven by a leadership team with decades of combined experience. We are committed to excellence and innovation in every project we undertake.

Our mission is clear: to build and safeguard America through the development, enhancement, and maintenance of border infrastructure, community assets, and heavy civil works.

We are guided by three core values-People. Building. Business.These principles shape our culture, inform our decisions, and strengthen the relationships we forge with clients, partners, and communities.

Job Summary

The Heavy Diesel Mechanic is responsible for inspecting, diagnosing, maintaining, and repairing heavy-duty diesel trucks and commercial trailers. This position performs preventative maintenance, troubleshoots mechanical and electrical issues, and responds to onsite and roadside breakdowns to minimize equipment downtime and keep the fleet safe and operational.

Essential Duties & Responsibilities:

• *Diagnose, troubleshoot, repair, and maintain heavy-duty diesel trucks and commercial trailers
• *Perform preventative maintenance, routine inspections, oil changes, filter replacements, and scheduled servicing
• *Diagnose and repair diesel engines, electrical systems, air brakes, suspension, steering, and drivetrain components
• *Diagnose and repair trailer brake systems, suspension, electrical systems, lighting, wheel ends, and structural components
• *Travel throughout Arizona to perform onsite repairs and respond to equipment breakdowns
• *Respond to roadside and emergency service calls as needed
• *Use diagnostic equipment and shop tools to identify mechanical and electrical issues
• *Identify potential mechanical problems before they result in equipment failure or downtime
• *Maintain accurate maintenance records and document completed repairs
• *Communicate equipment conditions, repair needs, and maintenance concerns to drivers and management
• *Maintain a clean, organized, and safe work environment
• *Follow company safety procedures and applicable Department of Transportation (DOT) requirements
• *Travel out of town or out of state and work weekends when needed to support company operations
• *Perform additional duties as assigned

Please note: This job description is not intended to be a comprehensive listing of all duties, responsibilities, or activities required of the employee. Responsibilities may evolve at any time with or without notice.

Required Qualifications

• *Minimum 3 years of hands-on heavy-duty truck and commercial trailer repair experience required; 5+ years preferred
• *Experience working on both heavy-duty trucks and commercial trailers required
• *Strong knowledge of diesel engines, Class 8 commercial trucks, and trailer systems
• *Experience diagnosing and repairing mechanical and electrical issues
• *Ability to independently perform repairs and preventative maintenance
• *Valid DOT Medical Card required
• *Valid driver's license required
• *Strong communication skills and ability to work independently
• *Welding, fabrication, mobile repair, and roadside service experience preferred
• *CDL is a plus but not required

Work Environment & Location

• *Position based in Marana, Arizona
• *Ability to travel throughout Arizona and out of state as required
• *Ability to perform onsite and roadside breakdown repairs
• *Availability to work Monday through Friday, with weekends as needed
• *Full-time position
• *Compensation based on experience and qualifications

Benefits

• *Competitive Pay
• *Medical, Dental, Vision & Life Insurance
• *401K Retirement Plan with Employer Match
• *Professional Development Opportunities

Equal Opportunity Statement

Spencer Trucking LLC is an Equal Opportunity Employer. Spencer Trucking LLC does not discriminate on the basis of race, religion, color, sex, gender, sexual orientation, age, non-disqualifying physical or mental disability, national origin, veteran status, or any other basis covered by applicable law. All employment decisions are based on qualifications, merit, and business needs.