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 479 of 775

TM 9-2350-311-10

3-6 ARMAMENT AND CAB MAINTENANCE — CONTINUED

3-6.8

Breech Mechanism — Continued

c. Assembly — Continued

12

13

14

NOTE

• Perform step 12 for the M109A2/M109A3/M109A4 M185 cannon assembly or for the

M109A5 M284 cannon assembly if the housing and firing block were removed.

• Perform step 13 for the M109A5 M284 cannon assembly with plunger assembly 11580174 if

only the spindle assembly was removed.

• Perform step 14 for the M109A5 M284 cannon assembly with plunger assembly 11580469.

Install plunger assembly (16 or 19) and secure with two new lockwashers (15 or 23) and two cap screws

(14 or 22). Be sure plunger tip seats in narrow slot of nut (17).

Rotate plunger assembly (19) to release from cam plate (21). Be sure plunger assembly tip seats in

narrow slot of nut (17).

Rotate pin (24) from position B or C to position A to seat plunger assembly (25) tip in narrow slot of nut

(17).

3-75