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 104 of 828
TM 9–2350–311–20–2
Change 2
2–43
WARNING
CARC paint is extremely hazardous. Refer to appropriate warnings listed in the front of this manual.
NOTE
Touch up painting will be in accordance with TM 43–0139. CARC painted vehicles will have the let-
ters CARC stenciled next to vehicle ID plate.
c.
Perform a visual inspection periodically to determine general condition. If corrosion is found, remove it and clean spot.
Paint and treat vehicles with the prescribed preservations.
NOTE
•
Air circulation under draped covers reduces deterioration from moisture and heat.
•
Place a piece of barrier material between desiccant bags and metal surfaces.
d.
Sunlight, heat, moisture (humidity), and dirt tend to accelerate deterioration. Install all covers (including vehicle protec-
tion closures) authorized for the equipment. Close and secure all openings except those required for venting and
draining. Seal openings to prevent the entry of rain, snow, or dust. Insert desiccant when complete seal is required.
Position equipment and provide blocking or framing to allow for ventilation and water drainage. Keep cover raised
above howitzer to allow air to circulate, preventing rust, rot, or mildew.
2–27 PREPARATION OF CANNON, FIRE CONTROL INSTRUMENTS, AND AUTOMOTIVE
EQUIPMENT
a.
Cannon
1
Thoroughly clean, dry, and coat the inside of cannon tube with preservation oil (item 8, Appx D) and insert a
strip of volatile corrosion inhibitor (VCI) paper the full length of the cannon tube. Seal breech and muzzle to
sustain VCI benefits.
2
Remove, clean, and dry bore evacuator chambers. Apply preservative oil (item 8, Appx D) to all machined
surfaces on the bore evacuator and the cannon tube. Replace the bore evacuator on the cannon tube. Do
no wrap or tape bore evacuator.
3
Remove, clean, and dry muzzle brake. Coat the muzzle brake lock, key, hardware, and unpainted surfaces
of the muzzle brake with grease, automotive and artillery (GAA) (item 18, Appx
D). Reassemble and wrap
muzzle brake with pressure-sensitive tape (item 39, Appx D).
NOTE
Breech mechanism of cannon is protected by the cab and does not need to be wrapped.
4
Wrap end of cannon tube with barrier material and seal with tape (item 39, Appx D).
5
Thoroughly clean and dry breech, breech ring, and breechblock before coating with GAA (item 18, Appx
D).
Set the breechblock in the closed position.
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