Diesel Mechanic

Location: Williston, ND – Shop & Field Service (occasional on‑site repairs)
Reports To: Fleet Maintenance Manager
Employment Type: Full‑Time, Hourly (OT eligible)

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About Us

Castle Oilfield is a fast‑growing oilfield trucking and logistics provider serving the Bakken region. Our mixed fleet of heavy‑haul tractors, winch trucks, frac‑sand haulers, and specialized trailers runs 24/7 in demanding conditions. Keeping that equipment mission‑ready takes skilled, safety‑minded mechanics—if that sounds like you, we’d love to talk.

What You’ll Do

• Diagnose & repair diesel engines, transmissions, hydraulics, pneumatics, DEF/after‑treatment, and electrical systems on Class 8 trucks and trailers.
• Perform preventive maintenance (PMs) including oil changes, filter replacements, lube services, brake inspections, and DOT annuals.
• Conduct field service calls with a fully stocked service truck; safely troubleshoot roadside or well‑site breakdowns.
• Document work in our CMMS (TMT/Trimble) for accurate repair history and parts tracking.
• Collaborate with drivers and dispatch to prioritize repairs, minimize downtime, and meet production schedules.
• Maintain a clean, safe shop—comply with OSHA, DOT, and company HSE policies at all times.

What You’ll Bring

Must‑Have

• 3+ years experience as a diesel tech (or tech school + 1 yr)
• Strong diagnostic skills with OEM software (e.g., Cummins Insite, Detroit DDDL)
• Own complete hand/tool set
• Ability to lift 75 lbs and work outdoors in all weather
• Valid driver’s license & clean MVR

Nice‑to‑Have

• Experience with Cummins X15, Detroit DD15, or PACCAR MX‑13 engines
• Welding/fabrication capability (stick & MIG)
• CDL‑A (or willingness to obtain)
• Hydraulic fracturing or oilfield equipment experience
• ASE T1‑T8 or EVT/FPS certifications

What We Offer

• Competitive pay: $32–$46/hour DOE + time‑and‑a‑half after 40 hrs
• Sign‑on bonus: $3,000 (paid at 90/180 days)
• Schedule: 5 × 10s or 4 × 12s; rotating on‑call weekend (paid standby)
• Benefits: Medical, dental, vision, 401(k) match, paid time off, and tool allowance
• Training: OEM online courses, paid ASE testing, and tuition reimbursement for advanced certifications
• Career path: Lead Tech → Shop Foreman → Maintenance Supervisor

Ready to Apply?

Preferred: Apply online at castleoilfield.net/jobs.
You may also email your résumé to [email protected] with “Diesel Mechanic – [Your Last Name]” in the subject line.

Questions? Call our recruiting line at (701) 572‑9273. We look forward to keeping the wheels turning with you on the Castle Oilfield team!