175mm Self-propelled Gun M1071-7

M107: General
Date of first acceptance 1962
  • Pacific Car and Foundry Co.
  • FMC Corp.
  • Bowen-McLaughlin-York
13 men:
  • Gunner on gun mount left
  • Gunner on gun mount right
  • Two loaders on gun mount right
  • Driver in hull left front
  • 8 in support vehicle
M107: Dimensions
Combat weight 62,100lbs
Height with gun in travel position 136.8"
Length without gun 254.3"
Gun overhang forward 190.5"
Width 124.0"
Tread 106.0"
Ground clearance 17.4"
Fire height ~80"
Ground pressure, zero penetration 11.7psi
M107: Armament
Type Mount Ammunition Traverse Max traverse rate Elevation Max elevation rate
175mm Gun M113 M158 at rear of vehicle 2 rounds 60°
(30° left and right;
manual and hydraulic)
8°/sec +65° to -2°
(manual and hydraulic)
M107: Armor
Rolled homogeneous steel
Location Thickness Angle from vertical
Front .5"
Driver's compartment sides and rear .5"
Driver's compartment top .5"
M107: Automotive
Engine General Motors 8V71T Model 7083-7398; 8 cylinder, 2 cycle, vee, supercharged diesel
Horsepower Net: 345@2300rpm
Gross: 405@2300rpm
Torque Net: 895 ft-lb@1600rpm
Gross: 980 ft-lb@1700rpm
Fuel capacity 300gal
Transmission Allison XTG-411-2A, 4 ranges forward, 2 reverse
Steering Mechanical, steering bar (clutch-brake in 1st, 2nd, 1st reverse; geared steer in 3rd, 4th, 2nd reverse)
Brakes Multiple disc
M107: Suspension
Type Road wheels Track return rollers
Torsion bar 5 individually sprung dual/track Flat track
Drive sprockets Idlers Shock absorbers
11-tooth front drive Rear road wheels serve as adjustable trailing idlers All road wheels fitted with hydraulic lock-out cylinders which serve as shock absorbers when vehicle is moving
M107: Track
Center guide, single pin, steel with detachable rubber pad
Width 18"
Pitch 6"
Shoes/track Left side: 75
Right side: 76
Ground contact length 148"
M107: Performance
Max level road speed 34mph
Max trench 84"
Max grade 60% Angle of approach 30°
Angle of departure 42° Max vertical obstacle 40"
Min turning diameter 24'
Max fording depth 42"
Cruising range ~450mi, roads
~720km, roads

The M107 used the same low, flat hull as the 8" self-propelled howitzer M110, and by 1981 all American M107s had been converted to M110A2s. The M110 and M107 also shared weapon mounts and loading and ramming devices, and a large hydraulically-operated stabilizing spade was mounted on the rear of the hull. A series of circular grates on the right side of the hull provided outlets for the engine exhaust. The vehicle was unarmored and open except for the driver's compartment, and four of the gun crew were forced to ride on seats mounted alongside the weapon, with eight more following in an M548 support vehicle. To decrease the gun barrel overhang, the weapon could be stowed slightly to the rear for traveling.

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  1. Hunnicutt, R.P. Sheridan: A History of the American Light Tank, volume 2. Navato, CA: Presidio Press, 1995. Reprinted with permission from Sheridan, R.P. Hunnicutt ©1995, available from Presidio Press, 505B San Martin Drive, Suite 160, Navato, CA 94945.
  2. TM 9-2300-216-10 Operator's Manual for Gun, Field Artillery, Self-propelled: Full Tracked, 175-mm, M107 (T235E1) (2350-436-6635) and Howitzer, Heavy, Self-propelled: Full Tracked, 8-inch, M110 (T236E1) (2350-439-6243). Washington, DC: Headquarters, Department of the Army, 28 June 1962.
  3. TM 9-2300-216-10 C5 Operator's Manual for Gun, Field Artillery, Self-propelled: 175-mm, M107 (2350-436-6635) and Howitzer, Heavy, Self-propelled: 8-inch, M110 (2350-439-6243). Washington, DC: Headquarters, Department of the Army, 16 October 1968.
  4. TM 9-2300-216-20P C2 Organizational Maintenance Repair Parts and Special Tools list for Gun, Field Artillery, Self-propelled: 175-mm, M107 (2350-436-6635) and Howitzer, Heavy, Self-propelled: 8-inch, M110 (2350-439-6243). Washington, DC: Headquarters, Department of the Army, 17 March 1970.
  5. Crismon, Fred W. U.S. Military Tracked Vehicles. Osceola, WI: Motorbooks International, 1992.
  6. Hogg, Ian V. The Greenhill Armoured Fighting Vehicles Data Book. London: Greenhill Books, 2000.
  7. Federation of American Scientists. "M107 175mm Self-Propelled Gun." DOD 101. 7 August 1999. 16 April 2001 <http://www.fas.org/man/dod-101/sys/land/m107-175.htm>. DOD 101

Last updated 25 Jan 2023.
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