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Army MOS · Logistics

91B Wheeled Vehicle Mechanic

Current service use not established

This code is listed in the directory. Inclusion alone does not confirm current service use.

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Overview

A wheeled vehicle mechanic performs and supervises field level maintenance on light and heavy wheeled vehicles. The mechanic also conducts recovery operations involving these vehicles, their associated trailers, and material handling equipment.

Minimum ASVAB: MM 92

ASVAB policy: Not policy-reviewed · coverage unknown · as of 2026-10-19

Program scope has not been reviewed.

Policy applicability and coverage of the program's score routes have not been reviewed. Shown-route arithmetic is not an eligibility decision.

Source: smartbook-611-21-ch10c-fy2025 (source date 2025-12). Policy applicability has not been established.

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Core Skills

  • Light and heavy vehicle recovery
  • Field maintenance of vehicle trailers
  • Field maintenance of material handling equipment

Civilian Career Paths

Career associations are editorial assessments of the cited evidence, not an official crosswalk unless the evidence explicitly says so. O*NET supplies civilian occupation information, not proof of a military match. Related experience does not confer civilian qualifications. Tasks and tools below describe civilian work, not military training.

Bus and Truck Mechanics and Diesel Engine Specialists

Field maintenance of heavy wheeled vehicles and their trailers transfers directly to commercial truck maintenance work.

How to prepare: Complete hands-on training with a commercial truck diagnostic system, such as Cummins INSITE, to build familiarity with civilian equipment.

What the civilian work involves
  • Inspect brake systems, steering mechanisms, wheel bearings, and other important parts to ensure that they are in proper operating condition.
  • Raise trucks, buses, and heavy parts or equipment using hydraulic jacks or hoists.
  • Attach test instruments to equipment, and read dials and gauges to diagnose malfunctions.
Civilian tools and software (examples)
  • Computerized maintenance management system software CMMS
  • Cummins INSITE

Automotive Service Technicians and Mechanics

Field maintenance of light wheeled vehicles provides a practical foundation for civilian automotive inspection and repair.

How to prepare: Arrange supervised shop practice testing and adjusting repaired passenger-vehicle systems to manufacturer specifications.

What the civilian work involves
  • Inspect vehicles for damage and record findings so that necessary repairs can be made.
  • Test and adjust repaired systems to meet manufacturers' performance specifications.
  • Repair, reline, replace, and adjust brakes.

Mobile Heavy Equipment Mechanics, Except Engines

Field maintenance of material handling equipment and heavy wheeled vehicles provides relevant experience for mobile equipment repair.

How to prepare: Take manufacturer service training for the material handling equipment used by a target employer, focusing on inspection and post-repair testing.

What the civilian work involves
  • Repair and replace damaged or worn parts.
  • Test mechanical products and equipment after repair or assembly to ensure proper performance and compliance with manufacturers' specifications.
  • Operate and inspect machines or heavy equipment to diagnose defects.
Civilian tools and software (examples)
  • Maintenance management software

Notes & Sources

Evidence for this guidance (4 documents)
  1. Army COOL MOC feed: 91B Wheeled Vehicle Mechanic

    [1] data/authority/army-codes.json entry 91B (OSD COOL feed, fetched 2026-07-25); DB rank enlisted, authority codeType enlisted

    Supports: Light and heavy vehicle recovery, Field maintenance of vehicle trailers, Field maintenance of material handling equipment, Bus and Truck Mechanics and Diesel Engine Specialists (O*NET 49-3031.00), Automotive Service Technicians and Mechanics (O*NET 49-3023.00), Mobile Heavy Equipment Mechanics, Except Engines (O*NET 49-3042.00)

  2. O*NET: Bus and Truck Mechanics and Diesel Engine Specialists

    [2] O*NET 30.3 occupational data

    Supports: Bus and Truck Mechanics and Diesel Engine Specialists (O*NET 49-3031.00)

  3. O*NET: Automotive Service Technicians and Mechanics

    [3] O*NET 30.3 occupational data

    Supports: Automotive Service Technicians and Mechanics (O*NET 49-3023.00)

  4. O*NET: Mobile Heavy Equipment Mechanics, Except Engines

    [4] O*NET 30.3 occupational data

    Supports: Mobile Heavy Equipment Mechanics, Except Engines (O*NET 49-3042.00)

Defense contractor jobs for 91B

Predecessor codes

Historical codes with documented links to 91B. Each history page explains the change.

63B1Wheeled Vehicle Mechanic63B2Wheeled Vehicle Mechanic63B3Wheeled Vehicle Mechanic

Descriptions may be summarized for clarity. Verify all information with your branch career counselor or official military documentation before making career decisions.

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