M106: General | |||
Date of first acceptance | 1961 | Total acceptances | 860 |
Manufacturer | FMC Corp. | Crew | 6 men |
M106: Dimensions | |||
Combat weight | 25,700lbs 11,700kg |
Height over MG | 98.25" 249.6cm |
Maximum overall length | 194" 493cm |
Width with baseplate and bridge | 119.2" 302.8cm |
Tread | 85.0" 216cm |
Ground clearance | 16.13" 40.97cm |
Ground pressure, zero penetration | 8.2psi .58kg/cm² |
M106: Armament | ||||
Type | Mount | Ammunition | Traverse | Elevation |
107mm Mortar M30 | Passenger compartment | 93 rounds | 1,600 mils (775 mils left and 825 mils right; manual) |
+1,125 mils to +740 mils (manual) |
.50cal M2HB MG | Flexible on cupola mount | 600 rounds | 360° (manual) |
+58° to -21° (manual) |
Aiming equipment | ||||
Sightunit M34A2 or M53 for gunner | ||||
Night vision | ||||
Infrared periscope M19 for driver |
M106: Armor | ||
Assembly | ||
Welding | ||
Hull | ||
Rolled 5083/5086 H32 aluminum armor | ||
Location | Thickness | Angle from vertical |
Upper front | 1.5" 3.8cm |
45° |
Lower front | 1.5" 3.8cm |
30° |
Upper sides | 1.75" 4.45cm |
0° |
Lower sides | 1.25" 3.18cm |
0° |
Rear | 1.5" 3.8cm |
9° |
Ramp | 1.5" 3.8cm |
8° |
Top | 1.5" 3.8cm |
90° |
Floor | 1.125" 2.858cm |
90° |
M106: Automotive | |||||
Engine | Chrysler 75M; 8 cylinder, 4 cycle, vee gasoline | ||||
Horsepower | Gross: 215@4,000rpm | Torque | Gross: 332 ft-lb@2,800rpm | Fuel capacity | 85gal 320L |
Transmission | Allison TX-200-2A, 4 ranges forward, 1 reverse | ||||
Steering | DS200 controlled differential, steering levers | ||||
Brakes | Differential band |
M106: Suspension | ||
Type | Road wheels | Track return rollers |
Torsion bar | 5 individually sprung dual/track | Flat track |
Drive sprockets | Idlers | Shock absorbers | 10-tooth front drive | Dual adjustable at rear of track | On first and last road wheels/track |
M106: Track | |||||||
T130E1 | |||||||
Center guide, single pin, steel with detachable rubber pad | |||||||
Width | 15" 38cm |
Pitch | 6" 15cm |
Shoes/track | Left side: 63 Right side: 64 |
Ground contact length | 105" 267cm |
M106: Performance | |||
Max level road speed | 38mph 61kph |
Max water speed | 3.5mph 5.6kph |
Max trench | 66" 170cm |
Max grade | 60% |
Max sideslope | 30% | Max vertical obstacle | 24" 61cm |
Min turning radius | 12.8' 3.90m |
Max fording depth | Floats |
Cruising range | ~212mi, roads ~341km, roads |
The M106 was based on the M113 armored personnel carrier, with the mortar installed in the passenger compartment and firing to the rear. A baseplate and bridge were stowed on the vehicle's left rear side, allowing emplacement of the mortar away from the vehicle. A large circular folding roof hatch above the mortar replaced the rectangular cargo hatch of the personnel carrier and provided clearance when firing. Limit stops prevented the turntable from rotating past 650 mils left of center and 700 mils right of center; the remaining traverse was achieved by using the traverse of the standard mortar assembly. The elevation limit on the mortar was actually 5° beyond the scope of the firing table to account for the carrier being parked on a slope of up to 5°. The 107mm mortar M30 had originally been the 4.2" mortar M30, but was redesignated when the US Army adopted the metric system.
M106A1: General | |||
Date of first acceptance | September 1964 | Total acceptances | 1316 |
Manufacturer | FMC Corp. | Crew | 6 men |
M106A1: Dimensions | |||
Combat weight | 26,147lbs 11,860kg |
Height to top of MG pintle | 86.5" 220cm |
Maximum overall length | 194" 493cm |
Maximum overall width | 112.75" 286.39cm |
Tread | 85.0" 216cm |
Ground clearance | 16.125" 40.958cm |
Ground pressure, zero penetration | 8.3psi .58kg/cm² |
M106A1: Armament | ||||
Type | Mount | Ammunition | Traverse | Elevation |
107mm Mortar M30 | Passenger compartment | 88 rounds | 1,600 mils (775 mils left and 825 mils right; manual) |
+1,125 mils to +740 mils (manual) |
.50cal M2HB MG | Flexible on cupola mount | 600 rounds | 360° (manual) |
Manual |
Aiming equipment | ||||
Sightunit M34A2 or M53 for gunner | ||||
Night vision | ||||
Infrared periscope M19 for driver |
M106A1: Armor | ||
Assembly | ||
Welding | ||
Hull | ||
Rolled 5083/5086 H32 aluminum armor | ||
Location | Thickness | Angle from vertical |
Upper front | 1.5" 3.8cm |
45° |
Lower front | 1.5" 3.8cm |
30° |
Upper sides | 1.75" 4.45cm |
0° |
Lower sides | 1.25" 3.18cm |
0° |
Rear | 1.5" 3.8cm |
9° |
Ramp | 1.5" 3.8cm |
8° |
Top | 1.5" 3.8cm |
90° |
Floor | 1.125" 2.858cm |
90° |
M106A1: Automotive | |||||
Engine | General Motors 6V53; 6 cylinder, 2 cycle, vee diesel | ||||
Horsepower | Gross: 212@2,800rpm | Torque | Gross: 492 ft-lb@1,300rpm | Fuel capacity | 95gal 360L |
Transmission | Allison TX-100, 3 ranges forward, 1 reverse | ||||
Steering | DS200 controlled differential, steering levers | ||||
Brakes | Differential band |
M106A1: Suspension | ||
Type | Road wheels | Track return rollers |
Torsion bar | 5 individually sprung dual/track | Flat track |
Drive sprockets | Idlers | Shock absorbers | 10-tooth front drive | Dual adjustable at rear of track | On first and last road wheels/track |
M106A1: Track | |||||||
T130E1 | |||||||
Center guide, single pin, steel with detachable rubber pad | |||||||
Width | 15" 38cm |
Pitch | 6" 15cm |
Shoes/track | Left side: 63 Right side: 64 |
Ground contact length | 105" 267cm |
M106A1: Performance | |||
Max level road speed | 40mph 64kph |
Max water speed | 3.0mph 4.8kph |
Max trench | 66" 170cm |
Max grade | 60% |
Max sideslope | 30% | Max vertical obstacle | 24" 61cm |
Min turning radius | 12.8' 3.90m |
Max fording depth | Floats |
Cruising range | ~300mi, roads ~480km, roads |
The M106A1 was an M106 driven by the powerplant from the M113A1 APC, and the carrier vehicle also formed the basis of the M125A1 81mm self-propelled mortar. Ammunition stowage was modified to 88 rounds: 63 stowed on the right side in horizontal racks and 25 in vertical racks on the left side in front of the fuel compartment. A fuze rack on the fuel compartment wall stowed 72 fuzes, and a canister in each of the forward two right forward mortar ammunition stowage bins held eight additional fuzes.
M106A2: General | |||
Manufacturer | FMC Corp. | Crew | 6 men |
M106A2: Dimensions | |||
Combat weight | 26,910lbs 12,210kg |
Height over MG | 99.25" 252.1cm |
Length | 194" 493cm |
Width | 112.75" 286.39cm |
Tread | 85.0" 216cm |
Ground clearance | 17.1" 43.4cm |
Ground pressure, zero penetration | 8.5psi .60kg/cm² |
M106A2: Armament | ||||
Type | Mount | Ammunition | Traverse | Elevation |
107mm Mortar M30 | Passenger compartment | 88 rounds | 90° (manual) |
+85° to +45° (manual) |
.50cal M2HB MG | Flexible on cupola mount | 600 rounds | 360° (manual) |
Manual |
Night vision | ||||
Infrared periscope M19 for driver |
M106A2: Armor | ||
Assembly | ||
Welding | ||
Hull | ||
Rolled 5083/5086 H32 aluminum armor | ||
Location | Thickness | Angle from vertical |
Upper front | 1.5" 3.8cm |
45° |
Lower front | 1.5" 3.8cm |
30° |
Upper sides | 1.75" 4.45cm |
0° |
Lower sides | 1.25" 3.18cm |
0° |
Rear | 1.5" 3.8cm |
9° |
Ramp | 1.5" 3.8cm |
8° |
Top | 1.5" 3.8cm |
90° |
Floor | 1.125" 2.858cm |
90° |
M106A2: Automotive | |||||
Engine | General Motors 6V53; 6 cylinder, 2 cycle, vee diesel | ||||
Horsepower | Gross: 212@2,800rpm | Torque | Gross: 492 ft-lb@1,300rpm | Fuel capacity | 95gal 360L |
Transmission | Allison TX-100, 3 ranges forward, 1 reverse | ||||
Steering | DS200 controlled differential, steering levers | ||||
Brakes | Differential band |
M106A2: Suspension | ||
Type | Road wheels | Track return rollers |
Torsion bar | 5 individually sprung dual/track | Flat track |
Drive sprockets | Idlers | Shock absorbers | 10-tooth front drive | Dual adjustable at rear of track | On first, second, and last road wheels/track |
M106A2: Track | |||||||
T130E1 | |||||||
Center guide, single pin, steel with detachable rubber pad | |||||||
Width | 15" 38cm |
Pitch | 6" 15cm |
Shoes/track | Left side: 63 Right side: 64 |
Ground contact length | 105" 267cm |
T150 | |||||||
Center guide, double pin, steel with chevron rubber pad | |||||||
Width | 14.81" 37.62cm |
Pitch | 6" 15cm |
Shoes/track | Left side: 63 Right side: 64 |
Ground contact length | 105" 267cm |
M106A2: Performance | |||
Max level road speed | 40mph 64kph |
Max water speed | 3.6mph 5.8kph |
Max trench | 66" 170cm |
Max grade | 60% |
Max sideslope | 30% | Max vertical obstacle | 24" 61cm |
Min turning diameter | 26' 7.9m |
Max fording depth | Floats |
Cruising range | ~300mi, roads ~480km, roads |
M106A2 incorporated the improved suspension and engine cooling of the M113A2.