Landing Vehicle, Tracked, Howitzer, Mark 61-4

LVTH6: General
Date of first acceptance 1957 Total acceptances 210
Manufacturers
  • Ingersoll
  • Pacific Car and Foundry Co.
Crew
7 men:
  • Commander in turret right rear
  • Gunnner in turret right front
  • Loader in turret left rear
  • Driver in hull left front
  • Crew chief in hull right front
  • Two ammunition passers in hull
LVTH6: Dimensions
Combat weight (land) 86,600lbs
39,300kg
Height over AAMG 160.5"
407.8cm
Length 356"
904cm
Howitzer overhang forward 0"
Width 140.5"
356.9cm
Tread 116.7"
296.4cm
Ground clearance, sides 11"
28cm
Ground pressure, zero penetration 9.1psi
.64kg/cm²
LVTH6: Armament
Type Mount Ammunition Traverse Max traverse rate Elevation
105mm Howitzer M49 T172 in turret 151 rounds
(12 ready)
360°
(manual and hydraulic)
21°/sec +59° to -4.1°
(manual)
.50cal M2HB MG Flexible in turret AA mount 1050 rounds 360°
(manual)
-- Manual
.30cal M1919A4E1 MG Coaxial to 105mm howitzer 2000 rounds 360°
(manual and hydraulic)
21°/sec +59° to -4.1°
(manual)
Stabilizer
Elevation only
LVTH6: Armor
Assembly
Welding
Hull
Rolled homogeneous steel
Maximum .625"
1.59cm
Minimum .25"
.64cm
Turret
Rolled homogeneous steel
Location Thickness
Front 1"
2.5cm
Sides .75"
1.9cm
Top .25"
.64cm
LVTH6: Automotive
Engine Continental LV-1790-1; 12 cylinder, 4 cycle, 90° vee gasoline
Horsepower Net: 704@2800rpm
Gross: 810@2800rpm
Torque Net: 1440 ft-lb@2000rpm
Gross: 1610 ft-lb@2200rpm
Fuel capacity 456gal
1730L
Transmission Allison CD-850-4A or -4B, 2 ranges forward, 1 reverse
Steering Mechanical, wobble stick
Brakes Multiple plate, oil cooled
LVTH6: Suspension
Type Road wheels Track return rollers
Torsilastic 9 pairs of dual/track 5 dual/track
Drive sprockets Idlers Shock absorbers
17-tooth rear drive Dual compensating at front of track None
LVTH6: Track
Center guide, single pin, steel with inverted grouser
Width 20.75"
52.71cm
Pitch 5"
13cm
Shoes/track 134 Ground contact length 229.25"
582.30cm
LVTH6: Performance
Max level road speed 30mph
48kph
Max water speed 6.8mph
11kph
Max trench 144"
366cm
Max grade 60%
Max vertical obstacle 36"
91cm
Min turning diameter Pivot
Max fording depth Floats Cruising range ~190mi, roads
~57mi, water
~306km, roads
~92km, water

LVTH6 was the armored amphibian version of the LVTP5. The hulls were identical, but the H6 had a turret armed with a 105mm howitzer installed over the cargo compartment. The vehicle commander and loader had their own hatches in the turret. For water operations, the weight of the LVTH6 was reduced to 84,200lbs (38,200kg), and the howitzer ammunition was reduced to 100 rounds. Ground clearance under the center of the vehicle was 17" (43cm).

LVTH6s were modified to become LVTH6A1s, and the most obvious external difference is a large housing behind the turret which contained the modified engine air intake and exhaust system.

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References

  1. Hunnicutt, R.P. Bradley: A History of American Fighting and Support Vehicles. Navato, CA: Presidio Press, 1999. Reprinted with permission from Bradley, R.P. Hunnicutt ©1999, available from Presidio Press, 505B San Martin Drive, Suite 160, Navato, CA 94945.
  2. Research, Investigation and Experimentation in the Field of Amphibian Vehicles. Kalamazoo, MI: Ingersoll Kalamazoo Division, Borg-Warner Corp., Dec 1957.
  3. Crismon, Fred W. U.S. Military Tracked Vehicles. Osceola, WI: Motorbooks International, 1992.
  4. Estes, Kenneth W. Marines Under Armor. Annapolis, MD: Naval Institute Press, 2000.

Last updated 7 Feb 2014.
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