Diesel Utility Fleet Service Technician, Aerial & Crane Systems

Step into a day at Custom Truck One Source (CTOS)

When your shift starts, you’ll roll up to a bay where a bucket truck needs a safety inspection. After verifying hydraulics and DOT items, you’ll plug into Cummins Insite to chase down a drivability code on a medium-duty chassis. By midday, you’re swapping out a worn harness on a digger derrick and confirming LMI/LML readings. Before you clock out, you’ll close out a repair order for a rental unit and advise a customer on preventive maintenance—another productive day supporting the fleets that power utility, telecom, rail, and construction work across the country.

About CTOS: CTOS is a 30+ year industry leader with 40+ locations, 2,600 employees, and a 10,000+ unit fleet serving utility, telecom, rail, and construction markets.

What you’ll do

• Diagnose, repair, and maintain aerial, construction, and light/heavy-duty truck equipment.
• Perform inspections, troubleshooting, parts replacement, and repairs on rental, customer, and company units.

Platforms and brands you’ll see Truck chassis

Freightliner, Peterbilt, International, Mack, Ford, Chevrolet, RAM

Cranes

Load King, Terex, Manitowoc, Elliott, National

Equipment

Boom Trucks, Cranes, Bucket & Dump Trucks, Digger Derricks, Utility & Specialty Equipment

Schedule and benefits

• Monday–Friday day shift; overtime as needed.
• Competitive pay based on experience.
• 401(k) with match, medical, PTO, holidays, and sick time.

Grow your craft

Training on utility equipment is provided for qualified mechanics. Bring a strong mechanical foundation and curiosity—we’ll help you master the rest.

Core work areas Truck & chassis

• Medium/heavy-duty trucks, diesel engines, OEM platforms.
• Use diagnostic tools such as Cummins Insite, Detroit, Snap-On, etc.
• Perform DOT inspections.

Utility equipment

• Aerial/bucket trucks, boom trucks, digger derricks.
• LMI/LML systems and dielectric testing.

Hydraulics

• Find leaks, repair cylinders, and read schematics.
• Troubleshoot pumps, booms, outriggers, and PTO systems.

Electrical

• Diagnose faults in power, ground, and CAN systems.
• Read diagrams, use meters, and repair batteries, harnesses, ECM/TCM, etc.

Who thrives here

• All experience levels: Journeyman Techs, Vo-Tech grads, Veterans, and mechanics from construction, ag, or truck backgrounds.
• People with a solid mechanical base and a willingness to learn.

Education & background

• High school trades, Vo-Tech, or diesel programs.
• Military wheeled/track mechanic experience.
• On-the-job training or hands-on mechanical work.

Licensing & tools

• Valid driver’s license required.
• Mechanic tools.

Proficiencies

• Driver's License
• Electrical Systems Diagnostics & Repair
• Vehicle Electronics & Computer Controls
• Diesel Engine Systems
• Light Vehicle Diesel Engines
• Diesel & Heavy Equipment Systems
• Hydraulic Systems & Components
• Electrical Systems & Diagnostics (Heavy Equipment)
• Equipment Diagnostics & Troubleshooting
• Crane & Lifting Equipment Systems
• Aerial & Utility Equipment Systems
• DOT & Equipment Inspection Compliance

Machines & technologies you’ll use

• Diesel Engine (Detroit Diesel, Cummins, PACCAR)
• Diesel Vehicles (Ford)
• Crane (Konecranes, Terex, Manitowoc)
• Boom Truck (Terex, Altec, Elliott, Manitex, National Crane, Load King)
• Digger Derrick (Terex, Altec, Elliott)
• Aerial Devices (Terex, Altec, Elliott, Versalift)
• Boom Crane (Manitowoc, Link-Belt, Grove)
• Service Truck
• Power Take-Off (PTO)
• After Treatment Systems (DPF, DEF)

**Custom Truck One Source is an Equal Opportunity Employer.