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 477 of 775

TM 9-2350-311-10

3-6 ARMAMENT AND CAB MAINTENANCE -CONTINUED

3-8.8

Breech Mechanism—Continued

c. Assembly—Continued

The follower group has a safety interlock which keeps the block from moving to the firing position

until breechblock is fully closed. The follower must be in good working condition and properly

assembled in firing mechanism to make sure safety works to avoid injury.

6

Install spring (70), firing pin (69), and lock pin (68) on block assembly (29).

7

Install the following on spindle (32): front retaining ring (37), obturator pad (36), inner retaining ring (35),

rear retaining ring (34), and washer bearing (33). Make sure that retaining rings are alined 180° apart as

shown.

8

Install spindle assembly (31) in breechblock (9).

Change 2

3-73