Multiple Gun Motor Carriage M141-7

M14: General
Date of first acceptance December 1942 Total acceptances 1605
Manufacturer International Harvester Corp. Crew
5 men:
  • Commander in cab right
  • Gunner in turret
  • Two cannoneers on right and left of turret
  • Driver in cab left
M14: Dimensions
Combat weight 19,200lbs
Height 90"
Length with winch 255.5"
Gun overhang forward 0"
Width 85.625"
Front tread 66.5"
Rear tread 63.8"
Wheelbase 135.5"
Ground clearance 11.2"
M14: Armament
Type Mount Ammunition Traverse Max traverse rate Elevation
Two .50cal M2TTHB MG M33 5000 rounds 360°
60°/sec +90° to -10°
Reflex sight M18 or illuminated sight Mk. 9 Mod. 1
M14: Armor
Rolled homogeneous steel
Location Thickness Angle from vertical
Radiator louvres .31"
Windshield cover .625"
Sides .31"
Rear .31"
Hood top .31"
Rolled face-hardened steel
Location Thickness Angle from vertical
Shield .25"
0° to 35°
M14: Automotive
Engine International Harvester RED-450-B; 6 cylinder, 4 cycle, in-line gasoline
Horsepower Net: 143@2700rpm Torque Net: 348 ft-lb@800rpm Fuel capacity 60gal
Transmission Spicer 1856 constant mesh, 4 speeds forward, 1 reverse
Steering Steering wheel
M14: Suspension
Type Road wheels Track return rollers
Front: Semi-elliptic longitudinal leaf spring
Rear: Vertical volute spring
Front: Steel ventilated disc
Rear: 1 bogie/track;
4 dual/bogie
1 dual/track
Drive sprockets Idlers Shock absorbers
18-tooth front drive Spring-loaded at rear of track On front wheels
M14: Track
Center guide band type
Width 12"
Pitch 4"
Pitches/track 58 Track ground contact length 46.75"
M14: Performance
Max level road speed 42mph
Max grade 60%
Max vertical obstacle 12"
Min turning diameter 59'
Max fording depth 32"
Cruising range ~200mi, roads
~320km, roads

The M14 was based on the half-track personnel carrier M5. This vehicle had a twin .50cal machine gun turret placed in the passenger compartment. The turret, developed by the W. L. Maxson Corp., had its own self-contained batteries and a one-cylinder motor generator. The side and rear armor on the half-tracks were hinged at the top to allow the weapons to be fired at negative elevations. Towards the front, however, the guns could not be depressed below +30°.

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  1. TM 9-707 Basic Half-Track Vehicles (IHC) (Personnel Carrier M5, Car M9A1, Multiple Gun Motor Carriage M14, and Similar IHC Vehicles). Washington, DC: War Department, 21 May 1943.
  2. Hunnicutt, R.P. Half-Track: A History of American Semi-tracked Vehicles. Navato, CA: Presidio Press, 2001. Reprinted from Half-Track, R.P. Hunnicutt ©2001, available from Presidio Press, 505B San Martin Drive, Suite 160, Navato, CA 94945.
  3. Doyle, David. U.S. Half-tracks: The Development and Deployment of the U.S. Army's Half-track Based Multiple Gun Motor Carriages and Gun Motor Carriages, Part two. Ed. Pat Stansell. Delray Beach, FL: The Ampersand Publishing Group, Inc., 2016.
  4. Crismon, Fred W. U.S. Military Tracked Vehicles. Osceola, WI: Motorbooks International, 1992.
  5. Chamberlain, Peter, and Chris Ellis. British and American Tanks of World War Two. Frome, England: Cassell & Co., 2000.
  6. Siemers, Cary. "USA's Half Track Gun Motor/Mortar Carriages." World War II Tanks & Vehicles and Advanced Squad Leader. 4 Jul 2001. 16 Sep 2001 <>.
  7. Tank Data, vol. 2. Aberdeen Proving Ground, MD: US Army Ordnance School, Jul 1958.

Last updated 1 Jul 2018.
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© Copyright 2001-18 Chris Conners