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 302 of 775
TM 9–2350–311–10
2–204
Change 3
2–12 PREPARATION FOR FIRING — CONTINUED
2–12.5
Loading the 155MM Cannon — Continued
a.
Loading — Continued
WARNING
Never forget to put operating handle back to stowed position. If left down while closing
breechblock, it can cause serious injury to personnel. Make it a practice never to let go of
operating handle until you return it to stowed position.
CAUTION
Lock pin should be in closed position before opening breechblock.
7
Cannoneer no. 1 opens breechblock (2) (first round only) by depressing operating handle (3) detent
plunger (4) and pulling operating handle rearward until operating crank assembly (5) roller (6) is engaged
in operating cam (7). Cannoneer no. 1 then returns operating handle to stowed position (forward).
NOTE
During combat emergency missions the cannon tube may be loaded between –53 mils and +756
mils to meet operational requirements.
CAUTION
•
Always place rammer in stowed position when elevating cannon more than 800 mils to avoid
damaging rammer.
•
If rammer is left in ramming position when elevating above 800 mils, the rammer will strike
the floor and bend the rammer support shaft.
8
Assistant gunner ensures that cannon tube is at loading elevation (+300 to +400 mils).
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