TM-9-2350-311-20-2
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS
DECEMBER 1993
TM-9-2350-311-20-2 - Page 34 of 828
TM 9–2350–311–20–2
Change 2
1–3
Section I.
GENERAL INFORMATION
1–1
SCOPE
a.
Type of Manual: Unit maintenance.
b.
Model Number and Equipment Name: M109A2/M109A3/M109A4/M109A5 Howitzer, Medium, Self-Propelled, 155MM.
This manual deals with maintenance for the cab and associated components. TM 9–2350–311–20–1 deals with mainte-
nance of the hull and associated components.
c.
Purpose of Equipment: The howitzer cab, containing the M185 or M284 155MM cannon and secondary armament M2
heavy barrel caliber 50 machine gun, provides the firepower for the howitzer. The cab components also provide the fire
control for the 155MM cannon.
1–2
MAINTENANCE FORMS, RECORDS, AND REPORTS
a.
Department of the Army forms and procedures used for equipment maintenance will be those prescribed by (as appli-
cable) DA PAM 738–750, The Army Maintenance Management System; DA PAM 738–751, Functional
Users Manual
for the Army Maintenance Management System–Aviation (TAMMS–A); or AR 700–138, Army Logistics Readiness
and Sustainability.
b.
Accidents involving injury to personnel or damage to materiel will be reported on DA Form 285 (Accident Report) in
accordance with AR 385–40. Explosives and ammunition malfunctions will be reported in accordance with AR 75–1.
1–3
DESTRUCTION OF ARMY MATERIEL TO PREVENT ENEMY USE
Refer to TM 750–244–6 for procedures on how to destroy the M109 self-propelled howitzer. You will find procedures for
destruction of munitions in TM 43–0002–33 (improved conventional munitions). Procedures for destruction of chemical
munitions are outlined in TM 3–250.
Below are some general guidelines to follow in destruction of equipment to prevent enemy use.
Destruction of the vehicle, armament, and equipment when subject to capture or abandonment in a combat zone, will
be
undertaken only when the unit commander decides such action is necessary in accordance with orders of, or policy estab-
lished by, the Army commander.
In general, destruction of essential parts, 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 units to prevent construction of one complete unit from several damaged ones.
All items of sighting and fire control instruments and equipment, especially telescopes, gunner’s quadrants, and binocu-
lars, 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.
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