TM-9-2350-311-20-1
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS
AUGUST 1994
TM-9-2350-311-20-1 - Page 19 of 1275
TM 9-2350-311-20-1
SECTION 1. GENERAL INFORMATION
1-1 SCOPE
This maintenance manual contains instructions for unit-level maintenance of M109A2/M109A3/M109A4/M109A5
Howitzers’ hull, powerplant, drive controls, tracks, suspension, and other hull-related components.
When the nature of the repair, modification, or adjustment is beyond the scope of facilities of unit maintenance, the
supporting unit should be informed so trained personnel with the correct tools and equipment may be provided, or other
instructions issued.
Replacement or adjustment of parts or major assemblies that are normally support maintenance operations maybe
done at unit maintenance in an emergency if permission is obtained from the responsible commander. A replacement
part or assembly, a tool needed for work, and any special instructions should be obtained from the supporting
maintenance unit.
1-2 MAINTENANCE FORMS, RECORDS, AND REPORTS
Department of the Army forms and procedures used for equipment maintenance will be those prescribed by (as
applicable) DA PAM 738-750, The Army Maintenance Management System (TAMMS); DA PAM 738-751, Functional
Users Manual for The Army Maintenance Management System — Aviation (TAMMS-A); or AR700-138, Army Logistics
Readiness and Sustainability.
Accidents involving injury to personnel or damage to materiel will be reported on DA Form 285, US Army Accident
Investigation Report, in accordance with AR 385-40. Explosive ammunition malfunctions will be reported in accordance
with AR 75-1.
1-3 DESTRUCTION OF ARMY MATERIEL TO PREVENT ENEMY USE
Destruction of the vehicle, armament, and equipment, when subject to capture or abandonment in a combat zone, will
be undertaken by the using army only when the unit commander decides such action is necessary in accordance with
orders of, or policy established by, the Army commander.
Read TM 750-244-6, Procedures for Destruction of Tank-Automotive Equipment to Prevent Enemy Use, for information
on destruction of all mechanical equipment. In general, destruction of essential components, followed by burning, will
usually be sufficient to render the vehicle, armament, and equipment useless. Time is usually critical.
Materiel must be damaged so that it cannot be restored to usable condition by either repair or cannibalization. If a lack
of time or personnel prevents destruction of all parts, give priority to destruction of parts hardest to replace. It is important
that the same parts be destroyed on all vehicles to prevent construction of one complete vehicle from several damaged
ones.
All items of sighting and fire control instruments and equipment, especially telescopes, gunner’s quadrants, and
binoculars, are costly and difficult to replace. They should be conserved whenever possible. If you cannot carry them
with you, destroy them by smashing with your sledgehammer, pick, or mattock. Throw the pieces in all directions.
1-5
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