Master Diesel Technician - Kenworth Tractors & PACCAR MX Engines

Position Summary

The Master Diesel Technician performs advanced diagnostics, troubleshooting, repair, and preventive maintenance on Kenworth tractors equipped with PACCAR MX engines and related systems. This role serves as a technical leader in the shop—mentoring technicians and ensuring repairs are completed safely, accurately, and efficiently the first time.

Key Responsibilities

• Perform advanced diagnostics on Kenworth tractors using Davie4 and OEM diagnostic software.
• Diagnose and repair PACCAR MX-11 and MX-13 engines.
• Troubleshoot electrical, aftertreatment, emissions, fuel, cooling, and drivetrain systems.
• Perform engine overhauls, cylinder head repairs, and major component replacements.
• Diagnose and repair Eaton, Allison, and PACCAR transmission systems.
• Perform preventive maintenance inspections and identify potential failures before they cause downtime.
• Accurately document repairs, parts usage, and labor hours.
• Support and mentor apprentice and journeyman technicians.
• Ensure all repairs meet OEM specifications and company safety standards.
• Support DOT compliance and inspection readiness across the fleet.

Requirements

• 5+ years of heavy-duty diesel repair experience.
• Extensive hands-on experience with Kenworth tractors and PACCAR MX engines.
• Advanced diagnostic and root-cause troubleshooting skills.
• Experience with electrical systems, multiplexing, and CAN communication networks.
• Working knowledge of aftertreatment and emissions systems (DPF, SCR, EGR).
• Valid driver's license and acceptable driving record.
• Own set of hand tools appropriate to the trade.
• Ability to work independently and as part of a team in a fast-paced environment.
• Ability to read and interpret technical manuals and schematics.
• Able to provide own basic mechanic tools.
• Be able to read, write, and speak English.

Preferred

• PACCAR Master Technician certification.
• OEM Kenworth and PACCAR training certifications.
• ASE Medium/Heavy Truck certifications (T-series) or ASE Master Medium/Heavy Truck.
• Experience in severe-duty oilfield, transportation, or fleet operations in the Permian Basin.

Physical Requirements

• Able to lift, carry, push, and pull up 50 lbs and occasionally more with assistance of medical devices.
• Able to stand, walk, bend, stoop, kneel, crouch, crawl, and climb for extended periods during the workday.
• Able to work underneath, around, and inside heavy equipment in small spaces.
• Able to use hands and fingers for gripping, handling tools, operating diagnostic equipment, and performing precise mechanical repairs.
• Able to frequently reach above shoulder level and below the waist.
• Able to safely operate hand tools, power tools, welding equipment, jacks, hoists, and other shop equipment.
• Able to climb ladders and mount/dismount heavy equipment safety.
• Able to work in varying environmental conditions including heat, cold, dust, grease, noise, vibration, and exposure to chemicals or fumes.
• Able to wear required personal protective equipment (PPE) including safety glasses, gloves, steel-toed boots, hearing protection, and respirators when required.
• Able to visually inspect equipment, read gauges and technical manuals, and distinguish colors related to wiring and diagnostics.

Behavioral Competencies

• Self-motivated with the ability to work independently under pressure.
• Dedication and commitment to teamwork and common goals.
• Strong moral character and professionalism, especially when representing the company in the field.
• Adaptability to changing priorities, environments, and urgent repair needs.
• Commitment to safety, quality workmanship, and continuous improvement.

Schedule

Monday – Friday; Weekends as needed

Exemption Status

Non-exempt

Reports To

Manager, Fleet Maintenance