The T-9 and T-10 carriages were projects using low-grade steel alloys that were canceled when no longer needed. The M1A1E1 carriage was intended for use in jungle and muddy terrain and replaced the wheels of the M1A1 with a free-wheeling tracked suspension, but the project was terminated after V-J day without having reached production. The M1A2 replaced the ratchet with a screw-jack system and also modified the traveling lock. Both the M1 and M1A1 carriages used a mid-axle firing pedestal that was extended by a ratchet mechanism.
The original Warner electric brakes were replaced by Westinghouse air brakes on the M1A1. It went through a number of minor changes over time. The carriage was also used by the 4.5 inch Gun M-1. The M1A1 was redesignated as the M114A1 in 1962. This meant that two separate movements were necessary to open the breech, versus the single movement of the 'steep cone' mechanism that simultaneously rotated and withdrew the breech.
Uniquely it was the sole 'slow-cone' interrupted screw mechanism to enter US service after 1920. The howitzer itself differed from the older model by a lengthened barrel of 20 calibers and a new breech mechanism. This was completed by when the Howitzer M1 on the Carriage M1 was standardized. So development began anew with a carriage designed to be used for either the 155 mm howitzer or the 4.7-inch (120 mm) gun. The M114A1 remains in service in some countries.Ī new carriage was under development for much of the 1930s for the existing World War I-era M-1918 155 mm howitzer, which was a license-built French Canon de 155 C modèle 1917 Schneider until 1939 when it was realized that it did not seem logical to put a new carriage underneath an obsolete howitzer. The gun was also used by the armed forces of many nations. It saw service with the US Army during World War II, the Korean War, and the Vietnam War, before being replaced by the M198 howitzer. It was first produced in 1942 as a medium artillery piece under the designation of 155 mm Howitzer M1. The M114 is a towed howitzer developed and used by the United States Army.
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