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 458 of 775

TM 9-2350-311-10

3-6 ARMAMENT AND CAB MAINTENANCE - CONTINUED

3-6.7.1

Muzzle Brake and Bore Evacuator (11580776)

a. Removal

1

Remove muzzle brake (para 3-6.7).

2

Remove muzzle brake thrust collar (1) from cannon tube (2).

Bore evacuator assembly weighs approximately 200 pounds. Use caution to avoid injury to

personnel.

The bore evacuator assembly must be cleaned daily after firing.

NOTE

There are two setscrews at the muzzle end of the bore evacuator assembly. One is staked in

place and should not be removed. It holds the ball lock and spring in place. The second screw is

not staked. Removal of this screw will allow release of the ball lock device.

3

Remove setscrew (3) from bore evacuator thrust collar assembly (4).

NOTE

If ball is stuck or spring appears broken, notify unit maintenance.

4

Insert T-handle (5) into setscrew hole. Turn T-handle to engage with threads. Continue turning to

depress ball and spring. If T-handle is not available, a screwdriver can be used to depress ball.

3-58 Change 2