Field Diesel Technician

Job Description: (Field Based-Specialized Role) Diesel Technician

Organization: Shafer, Troxell & Howe or STH LLC. (dba STH)

Job Location: Frederick, MD

FLSA Status: Non-Exempt

Pay: Hourly

Base Pay Range: $35.00-$46.00/hr

Job Description

Looking for a rewarding field-based role where you deliver customer success and still make it home every night? Join us as a Diesel Technician!

The Diesel Engine Service Technician is responsible for diagnosing, servicing, and maintaining diesel engines and related systems in a safe, efficient, and customer-focused manner. This role requires mechanical and technical expertise, a strong understanding of diesel systems (both mechanical and ECM-based), and the ability to communicate effectively with clients. The ideal candidate will demonstrate a commitment to safety, professionalism, continuous learning, and promoting the company’s values and services while on-site.

Just a few of our amazing benefits

• Company vehicle
• 401(k) with company matching structure and vesting as of day one
• Comprehensive Medical, Dental, and Vision insurance
• Company paid employee Life Insurance
• Paid Time Off
• 10 Paid Holidays
• Team oriented work environment with company events
• Competitive wages (this position would be hourly + occasional overtime, double-time, and rotational, on-call incentives)

Job Responsibilities

• Diagnose issues in diesel engines and associated control systems accurately.
• Communicate effectively with internal teams and customers to explain findings and recommendations.
• Perform all tasks following strict safety protocols and company procedures.
• Complete time sheets, paperwork, and submit clear photos of completed work on the same day.
• Maintain clean and safe work environments—leaving job sites in better condition than found.
• Represent and promote the business to generate additional service opportunities.
• Use proper PPE and adhere to all safety requirements during service tasks.
• Participate in training and professional development sessions to continuously grow technical knowledge.
• Explain complex technical issues to customers in a clear, professional manner.
• Keep all relevant certifications current and compliant.

Required Qualifications

• Proven experience working with diesel engines, including both mechanical and ECM-controlled systems.
• Strong working knowledge of diesel engine components and their operations.
• Proficiency in using diagnostic tools and repair equipment.
• Experience in generator troubleshooting and preventative maintenance services (PMs).
• Excellent written and verbal communication skills.
• Strong organizational skills with the ability to complete documentation accurately and on time.
• Must be able to work independently while managing time effectively.
• High attention to detail and commitment to workplace safety standards.
• High School Diploma or Equivalency.
• Clean Driving Record.

Preferred Qualifications

• Advanced understanding of electrical systems within diesel engine platforms.
• Previous experience in a customer-facing field service role operating as a technician.
• Sales-oriented mindset, with a demonstrated ability to upsell PMs and additional service work.
• Track record of maintaining high customer service scores and productivity metrics.
• Familiarity with revenue tracking, call-back minimization, and productivity optimization.
• Strong problem-solving capabilities and mechanical aptitude.

Equal Opportunity Employer


This employer is required to notify all applicants of their rights pursuant to federal employment laws.
For further information, please review the Know Your Rights notice from the Department of Labor.