Diesel Technician - Mobile Mechanic

National-Wrecker-Service; Portsmouth (NH); On-site; USD 43,000 - 62,000; Full time

Benefits offered by this job

Health, dental, life insurance

401(k) with company match

PTO

Uniforms

Job summary

National Wrecker Service in Portsmouth, NH is seeking a Diesel Technician - Mobile Mechanic to provide on-site repairs for diesel trucks and trailers. You’ll work with engines from major makes, perform diagnostics, and troubleshoot electrical and air systems to keep fleets on the road.

This full-time role follows a 4‑day on/off rotation, with 8am‑8pm on-site shifts and 8pm‑8am on-call duties. Starting pay is $38/hour, with night-call incentives and a comprehensive benefits package offered by the

Qualifications

• Diesel mechanic experience.
• Heavy truck repair experience.
• Knowledge of diesels and truck systems including air brakes, steering, suspension.
• Current medical card and valid driver’s license with clean record.

Responsibilities

• Provide on-site repairs and maintenance for diesel trucks and trailers.
• Perform diagnostics and electrical troubleshooting.
• Repair air systems, suspension, steering components, and air brakes.
• Apply heavy-truck repair knowledge in the field.

Skills

Diesel mechanic experience

Heavy truck repair experience

Make knowledge (Cummins/Detroit/Isuzu)

Computer diagnostics

Electrical systems

Tools

Diagnostics software

Electrical diagnostics

Job description

Make your mark as a Diesel Technician - Mobile Mechanic with National Wrecker Service in Portsmouth, NH!

Job Snapshot:

• Pay: $38/hr starting pay, plus night-call incentives
• Schedule: This full-time role follows a 4-day on / 4-day off rotation, including 8am-8pm on-site shifts and on-call responsibilities from 8pm-8am during the same four days. Mechanics who live close to the central location may take their truck home for after-hours calls.
• Benefits: Health, dental, life insurance, short- and long-term disability coverage optional, a 401(k) with company match, paid time off (PTO), and uniforms

Who We're Looking For:

• Diesel mechanic experience
• Heavy truck repair experience
• Knowledge of all makes, including Cummins, Detroit, International, Hino, Isuzu, etc.
• Knowledge of computer diagnostics and electrical systems
• Knowledge of air system diagnostics and repairs
• Understanding of steering, suspension, air brakes, and general truck systems
• Current medical card
• Valid driver's license and a clean driving record

What You'll Do As Our Diesel Technician - Mobile Mechanic:

• Provide on‑site repairs and maintenance for diesel trucks and trailers
• Work with engines from Cummins, Detroit, International, Hino, Isuzu, and others
• Perform computer diagnostics and electrical troubleshooting
• Repair air systems, suspension, steering components, and air brakes
• Apply strong diesel knowledge and heavy-truck repair experience in the field

The Bigger Picture:

For over 50 years, National Wrecker Service has delivered dependable roadside assistance and towing throughout New England. Our foundation is built on strong customer relationships, quality workmanship, and an unwavering dedication to service. As a family-owned business, we maintain a culture where employees are supported, appreciated, and given opportunities to grow. We value reliability, honesty, and the pursuit of excellence - and we pass those values on to every team member. When you join us, you become part of a long-standing tradition of high standards, community involvement, and a company that truly takes care of its people.