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Army MOS · Engineering

91L Construction Equipment Repairer

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 Construction Equipment Repairer performs and supervises field level maintenance on construction equipment. They service equipment used for earthmoving, grading, compaction, lifting, loading, quarrying, rock crushing, mixing, surfacing, water pumping, air compression, pneumatic tools, and powered bridging.

Minimum ASVAB: MM 87

ASVAB policy: Not policy-reviewed · coverage unknown · as of 2026-10-18

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

  • Quarrying and rock-crushing equipment maintenance
  • Water pump and pneumatic equipment maintenance
  • Powered bridging equipment field maintenance

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.

Mobile Heavy Equipment Mechanics, Except Engines

Field-level maintenance of earthmoving, grading, compaction, lifting, and loading equipment transfers directly to civilian heavy equipment repair.

How to prepare: Take a manufacturer-specific service course for the equipment used by a target construction fleet or equipment dealer.

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
  • Recordkeeping software

Training & Development

Choose credentials for your target role. COOL funding markers describe program listings, not a guarantee of eligibility or funding.

Career Growth

  • Certified Maintenance and Reliability Professionals (CMRP)

    Build on hands-on equipment repair with broader maintenance and reliability knowledge.

    Eligibility and preparation: No education or work-experience minimum; candidates must not have taken the exam within the preceding six months.

    For: Mobile Heavy Equipment Mechanics, Except Engines

Notes & Sources

Evidence for this guidance (4 documents)
  1. Army COOL MOC feed: 91L Construction Equipment Repairer

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

    Supports: Quarrying and rock-crushing equipment maintenance, Water pump and pneumatic equipment maintenance, Powered bridging equipment field maintenance, Mobile Heavy Equipment Mechanics, Except Engines (O*NET 49-3042.00)

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

    [2] O*NET 30.3 occupational data

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

  3. COOL credential mapping: Certified Maintenance and Reliability Professionals (CMRP)

    [3] 91L cached COOL credential feed

    Supports: Certified Maintenance and Reliability Professionals (CMRP)

  4. Society for Maintenance and Reliability Professionals: CMRP eligibility

    [4] Eligibility; retrieved 23 September 2026

    Supports: Certified Maintenance and Reliability Professionals (CMRP)

Defense contractor jobs for 91L

Predecessor codes

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

62B1Construction Equipment Repairer62B2Construction Equipment Repairer62B3Construction Equipment Repairer

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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