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Diesel Technician III

Knight's Companies
Summerville, United Statesfull_timeVerifiedPosted 9 Jan 2026

About the role

Description

Purpose:


This position is responsible for performing maintenance and repairs on diesel and non-diesel vehicles and heavy equipment to sound safe, and reliable performance of the vehicle and/or equipment, as well as provide guidance and assistance to Diesel Technicians I and II.


Essential Functions:

  • Ensure compliance with safety regulations, environmental standards, and company policies.
  • Contribute to a positive, team-oriented culture while upholding the company’s core values.
  • Change and repair tires per manufacturer specifications.
  • Perform oil and filter services on automobiles, concrete trucks, tractor-trailers, front-end loaders, and several types of equipment.
  • Perform diagnostics and repairs on electrical systems ranging from auxiliary components (e.g., lighting, switches) to complex 12V and 24V primary electrical architectures on fleet trucks and heavy equipment.
  • Assess power and hydraulic systems to ensure operation per manufacturer specifications.
  • Complete required lubrication and greasing of all wear items on affected trucks and equipment.
  • Diagnose and repair wheel bearings, hub assemblies, and seals on steer and drive axles.
  • Remove and repair universal and slip joints and support bearings on drive shafts.
  • Diagnose and repair air and hydraulic brake systems and pressurized water systems.
  • Perform major diagnosis and repair of gas and diesel engines.
  • Complete engine reconditioning service.
  • Diagnose and repair fuel injection, transmission, and regeneration systems using laptop and scan diagnostic tools.
  • Remove, disassemble, diagnose, and repair differentials.
  • Remove and repair automatic and manual transmissions.
  • Perform service calls to diagnose and repair off-site trucks and equipment using company service vehicle.
  • Return affected vehicles or equipment to service as efficiently as possible, while ensuring accurate repairs have been made.
  • Maintain cleanliness and orderliness of the company service vehicle.
  • Ensure that all tools and equipment is returned to the proper location in the company service vehicle.
  • Use pressure washer to maintain cleanliness of the equipment.
  • Maintain clean and organized work area.
  • Follow repair order directions.
  • Complete write-up and provide accurate description or repairs made and parts utilized in a timely manner.
  • Coordinate procurement of required components and ensure timely return of core parts to the Parts Department in accordance with inventory and warranty protocols.
  • Work closely with Area Fleet Manager to maintain positive workflow throughout the shop.
  • Provide guidance and assistance to Diesel Technicians I and II when needed.
  • Perform other duties as assigned.

Requirements

Minimum Requirements:

  • Valid Driver’s License required.
  • High School Diploma/GED preferred.
  • Auto or diesel technology diploma from an accredited technical school preferred; or minimum of 5 years’ experience performing maintenance or mechanical ability.
  • ASE Certifications preferred.
  • Commercial Driver’s License Class A or B preferred.
  • Ability to operate a manual transmission vehicle to determine if it is operating properly.
  • Must provide own hand tools & toolbox.
  • Knowledge of handheld scanning tools and the process of diagnosing vehicles.
  • Ability to read schematics and familiarity with the process.
  • Proficient computer skills: knowledge of Excel, Word, Fleet Management Systems, and Email
  • Strong written and verbal communication skills (documentation, communication with peers, supervisors, etc.)

Physical Demands:

  • Ability to lift a minimum of 60 lbs. from floor to waist height.
  • Ability to carry a minimum of 60 lbs. over a 5-foot span.
  • Ability to push/pull a minimum of 50 lbs. across a 10-foot span.
  • Ability to lift a minimum of 20 lbs. from waist to shoulder.
  • Use their hands to handle, control, or feel objects, tools, or controls.
  • Ability to stand for long periods of time.
  • Ability to bend or twist body without restriction.
  • Ability to kneel, stoop, crouch, or crawl.
  • Ability to work in extreme weather, including but not limited to high heat, low temperature, and high sun environments.



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