Mobile Heavy Equipment Diagnostics Mechanic

Join a specialized fleet leader

Custom Truck One Source (CTOS) serves utility, telecom, rail, and construction customers with a 10,000+ unit fleet. Over 30+ years and 40+ locations, 2,600 employees have built CTOS into the go-to partner for complex equipment in the field.

Role snapshot

• Title: Mobile Heavy Equipment Diagnostics Mechanic
• Scope: Field-based troubleshooting, repair, and maintenance for aerial devices, construction equipment, and light/heavy-duty trucks — including bucket trucks, digger derricks, cranes, and service trucks.
• Systems: Diesel, hydraulic, and electrical (including electronics and controls).
• Compliance: DOT inspections, dielectric testing, and full documentation on CTOS rental and customer-owned assets.

Territory and travel

• Louisiana, Mississippi, East Texas, and Western Alabama coverage.
• 60–80%+ travel with routine overnights.
• Frequent Gulf Coast work supporting oil, gas, and utility sectors.

Key responsibilities

• Diagnose, repair, and maintain utility trucks and equipment at customer sites.
• Interpret electrical schematics, evaluate hydraulic performance, and resolve diesel drivability concerns.
• Conduct inspections, perform parts replacement, complete functional testing, and return equipment to service.
• Collaborate with CTOS teams and customers; operate independently when remote.

What we provide

• Fully equipped service truck (crane, welder, compressor).
• Competitive compensation with overtime.
• Benefits package, 401(k) match, PTO, tool program, and additional perks.

What you bring

• 7+ years of shop and field experience with utility, construction (yellow iron), or heavy equipment (CAT, Deere, Komatsu) and medium/heavy-duty trucks.
• Advanced mechanical, hydraulic, and electrical diagnostic ability.
• Self-sufficient, organized, and effective both solo and with a team.
• Valid driver’s license required; CDL Class B a plus. Personal tools required.

Required proficiencies

• DOT Medical Card
• Driver's License
• Construction Equipment Maintenance
• Heavy Equipment Repair
• Electrical Schematics
• Hydraulics Experience
• Vehicle Electronics & Computer Controls
• Diesel Engine Systems
• Light Vehicle Diesel Engines
• Field Service Readiness
• Diesel & Heavy Equipment Systems
• Hydraulic Systems & Components
• Electrical Systems & Diagnostics (Heavy Equipment)
• Equipment Diagnostics & Troubleshooting
• Power Take-Off (PTO) & Auxiliary Systems
• Crane & Lifting Equipment Systems
• Aerial & Utility Equipment Systems
• DOT & Equipment Inspection Compliance

Equipment you’ll service

• Diesel Engine (Detroit Diesel, Cummins, PACCAR)
• Diesel Vehicles (Ford)
• Boom Truck (Terex, Altec, Elliott, National Crane, Load King)
• Digger Derrick (Terex, Altec, Elliott)
• Aerial Devices (Terex, Altec, Elliott, Versalift)
• Boom Crane (Manitowoc, Link-Belt)
• Tractor-Trailer (Peterbilt, Kenworth, Freightliner, International, Volvo Trucks, Western Star)
• Refuse Truck
• Service Truck
• Hi-Rail Truck
• Power Take-Off (PTO)
• Load Moment Indicator (LMI)
• After Treatment Systems (DPF, DEF)

Custom Truck One Source is an Equal Opportunity Employer