TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
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TM 9-2350-311-10 3-6 ARMAMENT AND CAB MAINTENANCE — CONTINUED 3-8.7 Muzzle Brake and Bore Evacuator (11578385) — Continued a. Removal — Continued 3 With bearing ball depressed, screw thrust collar (2) rearward to uncover machine key (4). 4 Remove machine key (4) from muzzle brake (5) and cannon tube (6). Muzzle brake weighs approximately 350 pounds (159 personnel. kg). Use caution to avoid injury to 5 Unscrew muzzle brake (5) until threads on muzzle brake just clear threads on cannon tube (6). Attach sling (7) and hoist (8) to muzzle brake and remove muzzle brake from cannon tube. NOTE There are two setscrews at the muzzle brake end of the bore evacuator. One setscrew is staked in place and should not be removed. It holds the bearing ball and spring in place. The second setscrew is not staked. Removal of this one will allow release of the bearing ball. 6 Remove thrust collar (2) from cannon tube (6), and remove setscrew (9) from bore evacuator (10). 3-54 Change 2