Fleet Diesel Systems Technician — Chassis, PTO & Emissions

Torrey Holistics; Odessa (TX); On-site; USD 52,000 - 85,000; Full time

Benefits offered by this job

Paid vacation

Sick time

Holidays

401(k) match

Medical/dental/vision/prescription

Uniforms

Boot allowance

Ongoing training

Job summary

Custom Truck One Source (CTOS) is seeking a skilled diesel mechanic to own full-cycle maintenance and repair on Class 6-8 trucks, both in the shop and in the field. You will diagnose, repair, and rebuild a range of systems using OEM and aftermarket tools, ensuring safety and reliability for critical fleets.

You bring hands-on diesel experience, a strong mechanical aptitude, and a safety-first mindset; technical school or military mechanical training is encouraged.

Qualifications

• Valid driver's license; CDL preferred.
• Hands-on experience as a diesel mechanic on heavy trucks (Class 6-8).
• Safety-first mindset and strong mechanical aptitude are required.
• Technical school grads and veterans with mechanical training are encouraged to apply.

Responsibilities

• Perform advanced diagnostics to pinpoint mechanical, hydraulic, and electronic issues.
• Inspect, repair, and rebuild chassis, powertrain, steering, suspension, braking, and driveline on Class 6-8 trucks.
• Service emissions systems, DPf/DEF components, and aftertreatment performance.
• Install, configure, and repair PTO gearboxes, hydraulic pumps, valves, cylinders, and winches.
• Read schematics, diagnose 12V/24V electrical systems, and repair wiring and control modules.

Skills

Diesel mechanic experience

Mechanical aptitude

Safety-first mindset

Education

Technical school diploma or cert

Military mechanical training

Tools

OEM diagnostic tools

Diagnostic software

Job description

Join a Team That Keeps Critical Fleets Moving

Custom Truck One Source (CTOS) has spent three decades building a nationwide service network: 40+ locations, 2,600 teammates, and a 10,000+ unit fleet serving utility, telecom, rail, and construction. We're adding a skilled technician who can own full-cycle maintenance and repair on commercial trucks and heavy equipment—both in the shop and in the field.

Your Day, Your Impact

You'll start your day reviewing service tickets, prepping parts, and planning both shop jobs and mobile calls. One hour you're isolating an intermittent 24V electrical fault; the next, you're rebuilding a brake system or setting up a PTO to drive a hydraulic pump. You'll lean on advanced diagnostic software to get fast, accurate answers and return assets to service safely and efficiently.

What You'll Handle

• Advanced diagnostics: Use OEM-level and aftermarket tools to pinpoint mechanical, hydraulic, and electronic issues.
• Chassis/powertrain: Inspect, repair, and rebuild steering, suspension, braking, and driveline components on Class 6-8 trucks.
• Emissions systems: Service EGR circuits, coolers, and valves; support aftertreatment performance (DPF/DEF).
• PTO & hydraulics: Install, configure, and repair PTO gearboxes, pumps, valves, cylinders, winches, and integrated hydraulic systems.
• Electrical systems: Read schematics and repair complex 12V/24V circuits, wiring harnesses, starting/charging systems, and control modules.

What You Bring

• Valid driver's license; CDL preferred.
• Hands-on experience as a diesel mechanic on heavy trucks (Class 6, 7, or 8).
• Strong mechanical aptitude and a safety-first mindset.
• Technical school grads and military veterans with specialized mechanical training are encouraged to apply.

Tools, Tech, and Equipment You'll Work With

• Systems: Diesel engine platforms, diesel vehicles, aftertreatment (DPF/DEF), electrical diagnostics (12V/24V).
• Hydraulics: PTO-driven systems, pumps, valves, cylinders, and winches.
• Fleet assets: Box trucks, flatbeds/pickups, cranes, boom trucks, digger derricks, aerial devices, boom cranes, refuse trucks, and hi-rail trucks.

Core proficiencies

Diesel engine systems (including light vehicle diesels), heavy equipment systems, hydraulic components, and advanced equipment troubleshooting.

Compensation & Benefits

Competitive pay tied to your skills and experience, plus paid vacation, sick time, and holidays, 401(k) match, medical/dental/vision/prescription coverage, uniforms, boot allowance, ongoing training, and more.

Equal Opportunity Employer