TM-9-2350-311-10

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994

TM-9-2350-311-10 - Page 459 of 775

TM 9-2350-311-10

3-6 ARMAMENT AND CAB MAINTENANCE—CONTINUED

3-6.7.1

Muzzle Brake and Bore Evacuator (11580776)—Continued

a. Removal—Continued

5

Insert pry bar (6) into hole (7) and, with ball depressed, unscrew bore evacuator assembly thrust collar

(4) and remove.

l

Ensure main reservoir is centered when moving over gun tube threads to prevent damage or

dislodging preformed packings from grooves of reservoir.

l

Significant amount of moisture might have accumulated in the main reservoir.

6

Using sling and hoist pull main reservoir (8) forward.

NOTE

It may be necessary to use wooden block and hammer to tap preservoir toward muzzle brake

end for removal.

7

Remove prereservoir (9).

Upon visual inspection replace ring valve or valve balls if the valve balls appear non-spherical or

severely deformed or cracked, or if one or more balls are missing or if valve ring is cracked.

Failure to comply with this requirement could result in failure of the ring valve and thus flashback.

Notify unit maintenance for replacement.

NOTE

Use rag (item 35, Appx D) to catch nine valve balls when sliding valve ring forward.

8

Remove ring valve (10) and nine valve balls (11) from prereservoir (9).

9

Inspect prefromed packings (12, 13, and 14) on main reservoir (8) and prereservoir (9) for damage.

Notify unit maintenance for replacement.

Change 2

3-58.1