| M107: General | |||
| Date of first acceptance | 1962 | ||
| Manufacturers |
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Crew |
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| 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 |
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| M107: Armament | ||||||
| Type | Mount | Ammunition | Traverse | Max traverse rate | Elevation | Max elevation rate |
| 175mm Gun M113 or M113A1 | 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 |
| Aiming equipment | ||||||
| Panoramic telescope M115 for left gunner and elbow telescope M116C for right gunner | ||||||
| M107: Armor | ||
| Assembly | ||
| Welding | ||
| Hull | ||
| Rolled homogeneous steel | ||
| Location | Thickness | Angle from vertical |
| Front | .5" 1.3cm |
0° |
| Driver's compartment sides and rear | .5" 1.3cm |
0° |
| Driver's compartment top | .5" 1.3cm |
90° |
| M107: Automotive | |||||
| Engine | General Motors 8V71T Model 7083-7398; 8 cylinder, 2 cycle, vee, supercharged diesel | ||||
| Horsepower | Net: 345@2,300rpm Gross: 405@2,300rpm |
Torque | Net: 895 ft-lb@1,600rpm Gross: 980 ft-lb@1,700rpm |
Fuel capacity | 300gal 1,100L |
| 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% | Angle of approach | 30° |
| Angle of departure | 42° | Max vertical obstacle | 40" 100cm |
| Min turning diameter | 24' 7.3m |
Max fording depth | 42" 110cm |
| Cruising range | ~450mi, roads ~720km, roads |
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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.
