Army M1 Abrams System Maintainer (MOS 91A)

Army M1 Abrams Systems Maintainer (MOS 91A): Career Details

Army M1 Abrams Systems Maintainer (MOS 91A) is responsible for performing maintenance of M1 Abrams tanks.

These specialist will diagnose and troubleshoot any malfunctions on the Abrams tanks.

This is an entry-level position that requires an individual who wants to work with electronic and mechanical systems.

Qualifications and Training

To enter into this MOS, recruits must take the ASVAB test.

Recruits must score at least a 99 on the Mechanical Maintenance (MM) portion of the ASVAB test or a combination of an 88 on the Mechanical Maintenance and 92 on the General Technical (GT) portions of the ASVAB.

Once all testing is complete, recruits will attend Basic Combat Training for 10 weeks.

After Basic Training, soldiers will go to Advanced Individual Training for 24 weeks.

Advanced Individual Training consists of classroom and field instruction.

Skills that are helpful in this MOS include:

  • Detail oriented
  • Interest in a job with diesel and turbine engines
  • Science and math skills
  • Interest in electronic and electrical equipment

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What are the Job Duties of M1 Abrams System Maintainer?

Army M1 Abrams System Maintainer
Army M1 Abrams System Maintainer inside a Forward Repair System shelter. Image: wikimedia

The M1 Abrams System Maintainer is responsible for performing maintenance on various system components of the Abrams Tank.

The M1 Abrams Tank is the Army’s primary ground combat system.

The tank can reach speeds up to 42 mph, has a 1,500 horsepower turbine engine, is easily maneuverable, has special armor and provides on-the-move lethal assault capabilities against enemies.

Soldiers in this MOS are required to be familiar with all of the complex systems of the M1 Abrams.

They will learn and apply electronic and mechanical principles to complete maintenance activities safely.

They will use different test equipment on the tank.

Testing will also be completed on the weapons systems to ensure the weapons fire for units in the field.

The specialist will operate and complete maintenance on the weapons systems.

Related Article – See our full Military MOS list here.

M1 Abrams System Maintainer is required to complete repairs and any scheduled maintenance.

The System Maintainer will work with power and hand-tools to complete maintenance.

Schematics, drawings and wiring diagrams will also be used to complete maintenance activities.

They will go hands-on to complete any repairs with the turbine engine.

Specialist must be familiar with how to repair the suspension, transmission and any electrical components.

They are also required to troubleshoot/ repair steering, track-assembly, auxiliary power, hydraulic, fire extinguisher/suppression and gas particulate systems.

Any maintenance activities that are performed will be documented by the System Maintainer.

This position can require soldiers to perform repair duties in the field or in any other location that the tank is stationed.

The Army video below provides more information on MOS 91A duties.

Job Reviews

Reviews of this position are positive.

Most previous employees ranked this position 3 to 4 stars.

Positive reviews discuss the learning experience and skills gained.

Negative reviews discuss the long hours and time spent away from family.

The review below provides positive aspects of the job.

Image: Indeed

The reviews below give different descriptions of job functions in this role.

Army MOS 91A
Image: Indeed

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Civilian Career Opportunities

The electronics and mechanical skills learned in this position relates to civilian career opportunities.

Soldiers can works as Diesel Engine Specialist, Bus/Truck Mechanics, Electrical Engineering Technicians or Machinery Maintenance Workers.

Through the Army’s COOL program, soldiers in this MOS have an opportunity to work towards certifications that help with Army promotions and civilian career opportunities.

Related certifications vary from truck repair on various components to safety certifications.


Army M1 Abrams Systems Maintainer (MOS 91A) is responsible for performing repairs and maintenance on the M1 Abrams tank.

The specialist in this MOS are skilled in electronic and mechanical systems and perform maintenance on a variety of different Abrams tank systems.

This is an entry-level position that requires Basic Combat Training and AIT.

Soldiers who have held the position previously recommend the position for the benefits and skills learned.

Civilian career opportunities related to this position include mechanic work on diesel engines, trucks/buses and electrical components.

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M1 Abrams Details

Army MOS 91A Career Details


Rob V.
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Originally posted on October 29, 2019 @ 4:09 am

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