Multiple Gun Motor Carriage M141-11

M14: General
Date of first acceptance December 1942 Total acceptances 1,605
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"
Ground pressure, tires 33.5psi
M14: Armament
Type Mount Ammunition Traverse Max traverse rate Elevation Max elevation rate
Two .50cal M2TTHB MG M33 5,000 rounds 360°
60°/sec +90° to -10°
Aiming equipment
Reflector sight Mark 9 Model 1 or reflex sight M18 for gunner
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@2,700rpm Torque Net: 348 ft-lb@800rpm Fuel capacity 60gal
Transmission Spicer 1856 constant mesh, 4 speeds forward, 1 reverse
Steering Steering wheel
Brakes Hydraulic (Hydrovac)
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%
Angle of approach 36° Angle of departure 32°
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°. Interrupter switches in the gun mount prevented firing when the guns approached the vehicle cab. The limits were set in azimuth as from 21.5°±1° left traverse to 52°±1° right traverse for the left-hand gun, with the right-hand gun having the opposite arrangement; and from the guns' lowest limit of depression to +10°±1° in elevation.




  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. TM 9-223 Twin Cal. .50 Machine Gun Mount M33 and Multiple Cal. .50 Machine Gun Mount M45. Washington, DC: War Department, 27 July 1944.
  4. TM 9-1223 Ordnance Maintenance--Twin Cal. .50 Machine Gun Mount M33 and Multiple Cal. .50 Machine Gun Mount M45. Washington, DC: War Department, 1 June 1944.
  5. TM 9-2800 Standard Military Motor Vehicles. Washington, DC: War Dept., 1 Sep 1943.
  6. 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.
  7. Crismon, Fred W. U.S. Military Tracked Vehicles. Osceola, WI: Motorbooks International, 1992.
  8. Chamberlain, Peter, and Chris Ellis. British and American Tanks of World War Two. Frome, England: Cassell & Co., 2000.
  9. 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 <>.
  10. Tank Data, vol. 2. Aberdeen Proving Ground, MD: US Army Ordnance School, Jul 1958.
  11. Track Data. Warren, MI: Track & Suspension Laboratory, Components Research and Development Laboratories, Research & Engineering Directorate, US Army Tank-Automotive Center, 23 June 1965.
Last updated 3 Mar 2024.
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