175mm Self-propelled Gun M1071-4
M107: General
Date of first acceptance 1962
Manufacturers
  • Pacific Car and Foundry Co.
  • FMC Corp.
  • Bowen-McLaughlin-York
Crew
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
28,200kg
Height with gun in travel position 136.8"
347.5cm
Length without gun 254.3"
345.9cm
Gun overhang forward 190.5"
483.9cm
Width 124.0"
315.0cm
Tread 106.0"
269.2cm
Ground clearance 17.4"
44.2cm
Fire height ~80"
~200cm
Ground pressure, zero penetration 11.7psi
.821kg/cm²
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)
6°/sec
M107: Armor
Assembly
Welding
Hull
Rolled homogeneous steel
Location Thickness Angle from vertical
Front .5"
1.3cm
Driver's compartment sides and rear .5"
1.3cm
Driver's compartment top .5"
1.3cm
90°
M107: Automotive
Engine General Motors 8V71T; 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
1100L
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
T132
Center guide, single pin, steel with detachable rubber pad
Width 18"
46cm
Pitch 6"
15cm
Shoes/track Left side: 75
Right side: 76
Ground contact length 148"
376cm
M107: Performance
Max level road speed 34mph
55kph
Max trench 84"
210cm
Max grade 60% Max vertical obstacle 40"
100cm
Min turning diameter Pivot Max fording depth 42"
110cm
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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References

  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. Crismon, Fred W. U.S. Military Tracked Vehicles. Osceola, WI: Motorbooks International, 1992.

  3. Hogg, Ian V. The Greenhill Armoured Fighting Vehicles Data Book. London: Greenhill Books, 2000.

  4. Federation of American Scientists. "M107 175mm Self-Propelled Gun." DOD 101. 7 Aug 1999. 16 Apr 2001 <http://www.fas.org/man/dod-101/sys/land/m107-175.htm>. DOD 101



Last updated 5 Dec 2001.

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© Copyright 2001 Chris Conners