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 470 of 775
TM 9--2350--311--10
3--66
Change 6
3--6
ARMAMENT AND CAB MAINTENANCE — CONTINUED
3--6.8
Breech Mechanism — Continued
a. Disassembly — Continued
NOTE
Step 22 is for M49 firing mechanism on the M109A5 M284 cannon assembly.
22
Disassemble M49 firing mechanism.
(a)
Place firing mechanism (2) on solid surface.
(b)
Place M34 or M18 fuzesetter over follower (53) and depress until grooved pin (54) can be removed
from manual control lever (55) and hammer guide yoke (56). Remove grooved pin and manual
control lever.
(c)
Raise and remove fuzesetter, follower (53), and case assembly (57).
(d)
Remove two retaining rings (58) and two grooved pins (59) from case (60) if damaged.
(e)
Remove two springs (61 and 62), sleeve bushing (63), and spring (64).
(f)
Separate hammer guide yoke (56), three bearing balls (65), firing hammer (66), and access cover
(67).
2
53
54
55
56
60
61
62
63
64
65
57
58
66
59
67
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