Heavy-Duty Diesel Powertrain Technician
Zum
Jessup, MD, USA
Posted on Mar 8, 2026
Zūm is transforming how students get to and from school. Our cloud-native platform unites parents, drivers, schools, and districts with real-time visibility, personalized care, and an electric-first fleet strategy. By optimizing routes and vehicle mix, we reduce student commute times by up to 20%. Since 2015, we’ve completed more than 8 million miles while elevating safety, reliability, efficiency, and sustainability.
A day in this role
You’ll Be The Go-to Expert For Diagnosing And Repairing Medium/heavy-duty Fleet Vehicles, Ensuring Every Bus Or Vehicle You Touch Is Safe, Compliant, And Ready To Roll. You Will
A day in this role
You’ll Be The Go-to Expert For Diagnosing And Repairing Medium/heavy-duty Fleet Vehicles, Ensuring Every Bus Or Vehicle You Touch Is Safe, Compliant, And Ready To Roll. You Will
- Diagnose faults and complete repairs across steering, electrical, cooling, lubrication, braking systems, drivetrains, suspensions, power steering units, clutches, and transmissions.
- Tune, test, and when needed rebuild engines; service oil, temperature, and fuel regulation components.
- Work within your qualification level and adhere to all applicable federal, state, and local requirements.
- Road-test vehicles to confirm issues are fully resolved.
- Secure required inspections and approvals for major repairs before releasing vehicles from the shop.
- Maintain a safe, organized, efficient workspace and ensure it meets all federal, state/provincial, and local regulations.
- Document labor hours, parts usage, and all maintenance/repair actions on the correct forms.
- Perform road calls and complete on-site roadside repairs as assigned.
- Identify additional repair needs and escalate items that require a higher technician qualification.
- Alert the Lead Technician to any unsafe maintenance practices or signs of vehicle abuse.
- 2–4 years of medium/heavy truck fleet maintenance experience.
- Strong diagnostic capability plus electrical and A/C proficiency.
- Deep knowledge of major vehicle systems and diesel equipment.
- Fleet background with both diesel and gasoline systems.
- Personally owned set of recommended minimum hand tools for diesel work.
- Sound judgment and decision-making skills.
- Valid state driver’s license; CDL preferred.
- ASE certifications are a plus, not a requirement.