Landing Vehicle, Tracked, Mark 4 belonging to the US Army Ordnance Museum.

This vehicle features the unarmored cab with two large bottom-hinged glass windows in the front. Mooring ties are mounted at each corner of the hull, and the track grousers that propelled the vehicle in water are obvious. Headlight mounts are on the front slope, and an antenna mount is behind the starboard headlight.

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Landing Vehicle, Tracked, Mark 4.

The unarmored cab was made from heavy-gauge steel, and the operation of the shatterproof front windows is shown here. Modified cabs had the front hatch hinges reversed so that the hatches opened upward. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4 belonging to the US Army Ordnance Museum.

The large pontoon inside the track run provided displacement for flotation; was a mounting point for the road wheels, idler wheel, and track return rollers; and could also be used for stowage. This vehicle has bows for a canvas cover mounted, but the cover itself is absent.

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Landing Vehicle, Tracked, Mark 4.

The rear loading ramp allowed a much more protected egress than jumping over the tall sides of earlier tractors. The relocation of the engine to behind the cab also increased the size of the cargo compartment from 364 cubic feet (10.3m³) in the LVT2 to 541.3 cubic feet (15.33m³) in the LVT4. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

The ramp of this vehicle is lowered, and forward is the engine room. The ramp was operated by a hand winch that, thanks to torsilastic springs in late-production vehicles, required no more than 15 pounds (6.8kg) of pressure at the handle to operate. Splash deflectors are just behind each track. (Picture from SNL G-209 Service Parts Catalog for Vehicle, Landing, Tracked, Mk. IV, LVT (4).)

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Landing Vehicle, Tracked, Mark 4.

The ramp was raised and lowered via a winch with a crank handle which was installed in the left rear sponson box. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

The winch found on early tractors was a hand-operated, two-speed, ratchet and pawl type. A shorter crank was also provided in the event that it was necessary to operate the winch from the top of the sponson box. The ballast control valve shown is the early type. A. Ratchet. B. Short pawl. C. Long pawl. D. Large crank. E. Cable. F. Cable guard. G. Drum sheave. H. Worm gear. J. Worm shaft. K. Countershaft. L. Roller chain. M. Worm. N. Ballast valve pull handle. P. Ballast valve vent pipe. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

Later-production machines had a hand-operated, two-speed, brake and drum winch for the rear ramp. As noted, instead of the plain ramp hinge found on the ratchet and pawl winch-equipped machines, the ramp on late vehicles featured a torsilastic hinge to help with operating the ramp. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

A hand-operated toggle lock was installed on top rear of each sponson box. These secured the ramp against its seal and provided adjustment to ensure the seal remained watertight. Clevises on the ramp bumper engaged the locks. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

A deeper look into the rear compartment is provided here. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

The engine room is viewed from above in this picture. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

The engine room with its rear panel removed is shown here from the passenger compartment. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

A molded rubber, self-sealing fuel tank was installed in each pontoon next to manhole covers 5 and 6. Late-production vehicles featured a second fuel tank in the right pontoon. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

Two 6-volt, 320 amp-hour storage batteries were connected in series in the left pontoon to maintain a 12-volt electrical system. The batteries were manufactured according to requirements set out by the US Navy rather than the Army's Ordnance Corps, with a different specific gravity being specified. Tracked landing vehicle batteries had a specific gravity of 1.200-1.225 at 80°F (27°C) when fully charged, versus 1.275 to 1.300 for batteries conforming to Ordnance Corps standards. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

The transmission, controlled differential, and final drives are shown dismounted. First and reverse speeds in the transmission were sliding gears. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

A schematic of a late-production ballast and bilge system is sketched here. The bilge pump, powered by a power takeoff from the engine, was a Peerless Pump Division V156DL with a capacity of 500gal/min (1,900L/min) at 2,400 engine rpm. A ballast control valve was installed in order to bring water into the ballast compartment so that the vehicle would float sufficiently low when no cargo was aboard. On early vehicles this valve was operated by a pull handle on the left rear sponson box ahead of the ramp winch. Later models, as shown in this image, utilized a two-way flap valve controlled from the driver's seat. When the handle was pulled upwards, water ingested from the sea cock flowed into the ballast compartment. When the handle was pushed down, the water in the ballast compartment passed into the bilge sump to be automatically pumped overboard. In order to leave water in the ballast compartment, the handle was pulled up and the sea cock closed. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

The early armored cab is shown here, with the observation hatch in front of the driver and the periscopes in the drivers' roof hatches protected by plastic hemispheres. (Picture from SNL G-209 Service Parts Catalog for Vehicle, Landing, Tracked, Mk. IV, LVT (4).)

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Landing Vehicle, Tracked, Mark 4.

The early armored cab could also be found with the bow machine gun mount. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

This vehicle has the late armored cab, and all five machine guns are mounted. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5).)

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Landing Vehicle, Tracked, Mark 4 at the Virginia Museum of Military Vehicles.

This vehicle is fitted with the final version of the armored cab. The driver and assistant driver are provided with vision blocks, and the bow machine gun mount is in front of the assistant driver. Note that the assistant driver's overhead hatch has a periscope, while the driver's does not.

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Landing Vehicle, Tracked, Mark 4.

Further details of the late armored cab are seen in this image. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4 at the American Armoured Foundation Tank Museum.

The applique armor bolted to the front of this LVT4 can be seen. Note the cutout to accommodate the bow towing pintle. The bumper (damaged on this vehicle) also doubled as a bilge pump drainage channel.

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Landing Vehicle, Tracked, Mark 4.

Also visible in the previous image is the hull escape hatch located to the driver's left, level with the floor. It allowed egress through the pontoon. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

The driver's controls are shown here. The steering levers had a locking mechanism that enabled the driver to keep the levers in position when the vehicle was parked. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

The right side of the driver's position is illustrated here, and the right steering lever can be seen in the lower left corner. The compass is the Sherill Research Corporation ORD M6, found in later-production vehicles. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

Before the Sherill compass was used, early machines were equipped with the Pioneer Instrument Company's No. 1829 mounted on the transmission to the driver's right. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

To the driver's left was his control panel. In front can be seen the left-side final drive exiting to the drive sprocket. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

Early and late versions of the driver's control panel are shown here. The early type did not have the emergency and circuit breaker reset buttons. The booster button connected the booster coil to the right magneto to provide additional high tension current when the engine was started. The blower switch activated or turned off the blower in the engine room in order to diffuse fumes. This switch was a safety and needed to be on before the starter and booster buttons could be used. The light switch in the lower left corner was for the exterior lights, but service lights were eliminated from late-production machines. The emergency button on late control panels could override the blower switch safety in case of failure and allow the starter and booster buttons to activate. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

The assistant driver's position in the late-model armored cab is shown here. As usual, no sighting device was provided for his machine gun, which was aimed via correcting tracers and impacts. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4.

Some late-production tractors were fitted with an auxiliary bilge pump at the assistant driver's position. This was manually operated by moving the handle back and forth, and was to be used during emergencies, when the main bilge pump was inoperative, or when there was excessive leakage or the main bilge pump could not handle the water load (although, in the last two instances, one wonders how much hope could be pinned on the assistant driver to salvage a situation for which the engine-powered main bilge pump was insufficient...). (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4 at the Virginia Museum of Military Vehicles.

This shot details the rear idler sprocket and the track tensioning mechanism. It was necessary to remove the mud guard above the adjusting screw to adjust the track tension. Correct tension was achieved when any gap between the idler slide and the slide head cap at the end of the screw was closed. Once the gap disappeared, the screw was turned three more notches then clamped securely.

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Landing Vehicle, Tracked, Mark 4.

The track tension is being adjusted here, showing the slide head cap and idler slide. (Picture from TM 9-775 Tracked Landing Vehicle Mk 4 (LVT(4)) Tracked Landing Vehicles (Armored) Mk 4 (LVT(A)(4)) and Mk 5 (LVT(A)(5)).)

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Landing Vehicle, Tracked, Mark 4 at the Virginia Museum of Military Vehicles.

In contrast to the LVT2, the rear road wheel on the LVT4 was fixed to the pontoon.

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Landing Vehicle, Tracked, Mark 4 at the Virginia Museum of Military Vehicles.

Details of the front drive sprocket, track skid on the front of the pontoon, and road wheel attachments can be seen here.

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Landing Vehicle, Tracked, Mark 4.

The positions of the crew are shown in this diagram. Thirty passengers could be carried in the rear compartment. (Picture from FM 17-34 Amphibious Tank and Tractor Battalions.)

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Last updated 6 Oct 2021.
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