| M76: General | |||
| Date of first acceptance | January 1951 | ||
| Manufacturer | Pontiac Division of General Motors | Crew |
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| M76: Dimensions | |||
| Fighting weight (est.) | 12,162lbs 5,516.7kg |
Height | 108" 274cm |
| Length overall with propeller in land travel position and guard down | 199.4" 506.5cm |
Width | 98" 250cm |
| Tread | 68" 170cm |
Ground clearance with 3,000lb (1,360kg) load | 16¾" 42.55cm |
| Ground pressure with max payload | 2.1psi .15kg/cm² |
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| M76: Armament | ||||
| Type | Mount | Ammunition | Traverse | Elevation |
| .50cal M2HB MG | Flexible in ring mount above assistant driver's hatch | 630 rounds | 360° (manual) |
Manual |
| M76: Armor |
| None |
| M76: Automotive | |||||
| Engine | Continental AOI-268-3A; 4 cylinder, 4 cycle, opposed, fuel-injected gasoline | ||||
| Horsepower | Net: 110@3,200rpm Gross: 135@3,200rpm |
Torque | Net: 208 ft-lb@2,200rpm Gross: 222 ft-lb@2,600rpm |
Fuel capacity | 70gal 260L |
| Transmission | Pontiac Motor Div. of GM Corp. CD-150-3, 2 ranges forward, 1 reverse | ||||
| Steering | Land: Mechanical, steering bar Water: Hydraulic, steering shaft |
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| Brakes | Hydraulic, multiple disk | ||||
| M76: Suspension | ||
| Type | Road wheels | Track return rollers |
| Torsion bar | 4 individually sprung dual/track | Flat track |
| Drive sprockets | Idlers | Shock absorbers | 12-tooth front drive | Dual at rear of track | On first and last road wheels/track |
| M76: Track | |||||||
| T102 | |||||||
| Double center and outside guide, rubber and steel cable band type with steel stamped cross bars | |||||||
| Width | 30" 76cm |
Pitch | 44" long sections; 4" crossbar pitch 110cm long sections; 10cm crossbar pitch |
Shoes/track | 8 sections/track; 88 crossbars/track |
Ground contact length | 96½" 245cm |
| T102E1 | |||||||
| Double center and outside guide, rubber and steel cable band type with steel welded cross bars | |||||||
| Width | 30" 76cm |
Pitch | 44" long sections; 4" crossbar pitch 110cm long sections; 10cm crossbar pitch |
Shoes/track | 8 sections/track; 88 crossbars/track |
Ground contact length | 96½" 245cm |
| M76: Performance | |||
| Max level road speed | 28mph 45kph |
Max water speed | 4½mph 7.2kph |
| Max trench | 60" 150cm |
Max grade | 60% |
| Max vertical obstacle | 18" 46cm |
Min turning diameter | Pivot |
| Angle of approach | 40¼° | Angle of departure | 45½° |
| Max fording depth | Floats | Cruising range | ~160mi, roads ~23mi, water ~260km, roads ~37km, water |
The M76 was produced from January 1951 to June 1954, although standardization did not occur until March 1953. Its watertight hull was constructed from riveted sheet aluminum and was separated into crew, engine, and cargo compartments. The transmission was mounted directly below the engine behind the drivers, and two 12-volt batteries were connected in series to provide for the 24-volt electrical system. The engine air intake as well as the engine and personnel heater exhaust utilized a trapezoidal-shaped stack between the drivers' roof hatches. The road wheels were interestingly surrounded by 6.60 x 15.00 pneumatic tires. A 5,000lb (2,200kg) capacity winch operated via a power take-off on the transmission was found beneath the rear seat. Water propulsion was by a single propeller that was also driven by a power take-off from the transmission and was mounted centrally on the rear hull below the two outward-opening doors. A 5lb (2.3kg) portable fire extinguisher was carried. Modifications introduced during production included moving the side-mounted fuel cells toward the rear, and consequently relocating the fuel and water cans, spare wheel, pioneer kit, and shutter stowage cover; adding a folding propeller guard; moving the rear steps; changing the bilge pump drive from gears to chains and modifying the bilge pump piping; altering the rear suspension arm to ease and increase track adjustment; and changing the towing pintle to a swiveling type. The vehicle's net weight was 8,813lb (3,998kg), and payload was 3,349lb (1,519kg). Length with the propeller in the water travel position with the propeller guard up was 188.4" (478.5cm); height with a 3,000lb (1,360kg) load was 103.3" (262.4cm); and height was reducible to 92" (230cm).
