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 74 of 775
TM 9-2350-311-10
1-14 EQUIPMENT OPERATION AND DESCRIPTION
— CONTINUED
1-14.8 Mount and Howitzer Assembly — Continued
c. Mount Assembly
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MOUNT. The mount (16) serves as a fulcrum for the elevation and depression of the cannon assembly.
VARIABLE RECOIL MECHANISM. The variable recoil mechanism (17) absorbs and reduces the recoil
force of the cannon assembly.
RECUPERATOR. The recuperator (18) returns the cannon tube to battery after firing.
COUNTER RECOIL BUFFER ASSEMBLY. The counter recoil buffer assembly (19) absorbs shock;
slows and cushions the cannon assembly as it returns to battery.
ACTUATOR. The actuator (20) adjusts recoil position depending on cannon elevation and allows longer
recoil at low elevation and short recoil at high elevation.
UPPER GUN ROTOR. The upper gun rotor (21) protects the cab interior from outside elements that
may come from above the cab.
LOWER GUN SHIELD. The lower gun shield (22) protects the cab interior from outside elements during
high angle fire.
TORQUE KEY. The torque key (23) fits in the keyway of the cradle on the mount (16) to prevent the
cannon tube from rotating.
DUST SHIELD. The dust shield (24) protects the variable recoil mechanism (17) from dirt and dust.
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