TM-9-2350-358-BD
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A6
TECHNICAL MANUAL; OPERATOR’S, UNIT, AND DIRECT SUPPORT SUPPORT MAINTENANCE
MARCH 1994
TM-9-2350-358-BD - Page 257 of 343
TM 9-2350-358-BD
SECTION III.
CANNON ASSEMBLY
12-6.
GUN TUBE INTERCHANGEABILITY
General Information:
Gun tubes and mounts sustain damage easily in a combat environment which may prevent fire missions. A wrecker, block
and tackle or improvised lifting device may be used to assist Interchanging them.
The 155MM gun of the M109A6 vehicle
is interchangeable only with the M109A5
Interchangeability Information
Vehicle
Tube
Mount
M109A5
M284
M182
12-7.
BORE EVACUATOR DAMAGE
General Information:
As a round is propelled through the gun tube, gas pressure is forced inside the bore evacuator.
As the round leaves the
tube, bore evacuator pressure rushes out behind the round, exhausting excessive smoke and fumes.
If the evacuator is
damaged or leaks, this pressure is lost, causing excessive smoke and fumes to enter the cab as the breech block opens.
This procedure repairs puncture damage to the bore evacuator.
Option 1:
Fabricated clamp.
Limitations:
None
Personnel/Time Required:
•
1 soldier
•
1.0 hour
Other Options:
•
Open cab hatches and turn on crew blower.
•
Ensure lead filter is ON.
Materials/Tools:
•
Acetylene torch
•
Suitable fire resistant material (scavenge from available source)
•
Grinder
•
Hexagon head nut, 3/8-inch (as required) (scavenge from available source)
•
Lockwashers (as required) (scavenge from available source)
•
Machine screws, 3/8-inch (as required) (scavenge from available source)
•
Sheet metal, 1/4-inch thick, about 21 inches long and wide enough to overlap damage (scavenge from available
source)
•
Drill
12-5
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