Description
TM 9-3049 Technical Manual - 75mm M3 Howitzer and M7 / M12 Howitzer Mounts - July 1953
Item Overview
Explore the light artillery used in U.S. assault guns and armored amphibians with TM 9-3049. This July 1953 technical manual covers the 75mm M3 howitzer and the M7 and M12 howitzer mounts. It is a useful reference for military vehicle research and a focused addition to an artillery manual collection.
Identification and Features
These details identify the publication and its covered equipment.
- Publication number: TM 9-3049
- Publication date: July 1953
- Weapon covered: 75mm M3 howitzer
- Mounts covered: 75mm M7 and M12 howitzer mounts
- Publication type: U.S. Army technical manual
Function and Manual Contents
This volume brings the M3 howitzer and both mount types together in one technical reference. The cannon delivers the shell, while the mount supports the weapon and controls its recoil. Use the manual alongside vehicle references when researching gun and mount maintenance, assembly details, and the relationship between the cannon and its supporting hardware.
Publication History
Army publication records date TM 9-3049 to July 23, 1953, during the closing month of the Korean War. Its issue date places it in the early Cold War, when equipment developed during World War II remained in military service. For publication collectors, it documents the postwar support of a wartime gun and mount family.
Documented Applications
The M3 howitzer served in the M7 mount on the 75mm Howitzer Motor Carriage M8 and the LVT(A)4 armored amphibian. The later LVT(A)5 used the M3 in the M12 mount. These applications connect the manual to both Army mobile assault guns and amphibious fire-support vehicles used by the Army and Marine Corps.
Equipment History: The 75mm M3 Howitzer
The M3 grew from the M1 and M1A1 pack howitzer family as the Army adapted light artillery for armored vehicles. The earlier vehicle-mounted M2 used a separate sleeve around its barrel to fit the cradle. The M3 had its recoil surface machined directly into the barrel. It retained a manually loaded, horizontal sliding breech, keeping the basic weapon compact for turret installation.
M7 Howitzer Mount History and Design
The M7 mount held the howitzer in a cradle with a recoil cylinder on each side. Oil slowed the gun's rearward movement after firing, while springs returned it to its starting position. Side pivots, called trunnions, allowed the howitzer to rise and lower. The shield attached to the front of the cradle and moved with it. This arrangement carried the light howitzer into both land and amphibious vehicles.
M12 Howitzer Mount History and Design
The M12 was used in the LVT(A)5's improved gun installation. This vehicle added powered turret traverse and an elevation stabilizer, which helped the howitzer hold its up-and-down aim as the hull moved. Developed late in World War II, the stabilized installation addressed the challenge of firing from a moving amphibian. It marks a step in the effort to make fire support from the water more effective.
Weapon-System Background
The M8 combined an M5 light tank chassis with an open-topped howitzer turret to give mobile units their own artillery support. The LVT(A)4 and LVT(A)5 filled a different need: approaching a beach from the sea and continuing onto land. Their howitzers added firepower during the critical period before tanks could come ashore. Together, these vehicles show how one light cannon could support very different missions.
History of Use
M8 howitzer motor carriages served with Army cavalry units during the World War II campaign in Europe. LVT(A)4s supported Pacific landings and were used as extra artillery on Okinawa in 1945. The LVT(A)5 arrived too late for World War II combat, but later served with Marines during the Korean War. The equipment covered by this manual therefore connects wartime mobile artillery with postwar amphibious operations.
Ideal For
A focused reference for those preserving, documenting, or studying U.S. vehicle-mounted 75mm artillery.
- U.S. Army technical manual collectors
- M8 howitzer motor carriage restoration research
- LVT(A)4 and LVT(A)5 museum projects
- World War II and Korean War ordnance historians
- Model builders studying gun and mount details
Approx length 6", Approx width 9", Approx height .35", Approx weight .7lbs.
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