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 457 of 775

TM 9-2350-311-10

3-6 ARMAMENT AND CAB MAINTENANCE - CONTINUED

3-6.7

Muzzle Brake and Bore Evacuator (11578385) - Continued

b. Installation - Continued

4

5

6

7

8

9

10

11

12

Install setscrew (9) on forward end of bore evacuator (10).

Notify unit maintenance to torque setscrew (9) to 30-35 ft-lb (4147 N.m).

Install thrust collar (2) rearward and screw on far enough to allow insertion of machine key (4) when

muzzle brake (5) is installed.

Muzzle brake weighs approximately 350 pounds (159 kg). Use caution to avoid injury to

personnel.

Before installing muzzle brake (5) clean and lubricate (item 30, Appx G).

Using sling (7) and hoist (8) raise muzzle brake (5) to cannon tube (6). Screw muzzle brake on threads,

and aline keyway in muzzle brake to keyway on cannon tube.

Insert machine key (4) in alined keyways.

Screw thrust collar (2) in place.

Install setscrew (1).

Notify unit maintenance to torque setscrew (1) to 30-35 ft-lb (4147 N.m).

Change 2

3-57