Field Service Diesel Mechanic

Field Service Technician / Mechanic

Custom Truck One Source (CTOS) is a leading manufacturer of Utility Trucks and Equipment with a rich history spanning 30 years. With 40 locations across the USA, over 2500 employees, and a rental fleet exceeding 10,000 trucks.

Hiring Field Service Technician / Mechanic with a background in truck mounted hydraulics, electrical wiring, diesel equipment. You will perform inspections, preventive maintenance, and repair of CTOS and Custom equipment.

We equip you for success with:

• Load King Cranes TEREX Cranes Manitowoc Cranes Elliott Cranes National Cranes
• CTOS Equipment: Boom Trucks / Cranes, Bucket / Dump Trucks, Digger Derricks, Utility Trucks & more.
• A company-provided utility service truck (crane, welder, compressor)
• Company phone, computer, and diagnostic tools
• Strong benefits, paid time off, 401(k) match, uniforms, safety gear allowance, tool discounts, and more
• You bring your mechanical skills, your own tools, and a valid driver's license (CDL preferred), and we'll provide everything else you need to thrive.

What You'll Do

You'll be the go-to expert for customers across your regiondiagnosing, repairing, and maintaining highly specialized truck-mounted equipment. Most work is performed on customer sites, with occasional shop support.

In this role, you'll:

• Troubleshoot, repair, and maintain:
• Bucket trucks / aerial devices
• Digger derricks
• Truck-mounted cranes (LMI & CAN-bus systems)
• Hydraulic utility equipment & major components
• Heavy- and light-duty truck chassis, diesel, and electrical systems
• Perform inspections, preventive maintenance, and on-site diagnostics
• Read and interpret manuals, schematics, and repair orders
• Use laptops and diagnostic software to identify issues
• Complete documentation accurately (repair orders, timecards, inspection forms)
• Communicate with customers and CTOS teams to minimize downtime
• Follow all safety, environmental, and regulatory requirements
• Participate in ongoing CTOS and manufacturer training
• Travel within and occasionally beyond your assigned territory

What Makes You a Great Fit

• You enjoy working independently and solving problems in real time
• You're experienced with hydraulic, mechanical, and electrical systems
• You're comfortable interacting with customers and working in the field
• You want a role where every day is different

Preferred Skills

• Electrical, hydraulics, welding, and schematic/blueprint reading
• Diagnostic software experience (QuickServe, DTNA, etc.)
• DOT, ANSI, and dielectric testing experience

Requirements

• High school diploma or GED
• 5+ years of related experience (field or shop tech)
• Valid driver's license (CDL Class B preferred)
• Must provide your own mechanic tools
• Proficiency using documentation software and managing time effectively

Compensation & Benefits

• Competitive pay based on experience + overtime opportunities
• 401(k) with employer match
• Medical, dental, vision, and life insurance
• Paid vacation, sick time, and holidays
• Short-term & long-term disability
• Employee Stock Purchase Plan
• Uniforms, safety boot & glasses allowance
• Tool discount programs

Custom Truck One Source is an Equal Opportunity Employer committed to creating an inclusive workplace. All qualified applicants will receive consideration without regard to protected characteristics.

We do not offer sponsorshipcandidates must be authorized to work in the U.S. without the need for sponsorship.