Armored Infantry Vehicle M75.

The two rear doors for infantry entry and exit are obvious in this rear view. Stowage for fuel or water cans and pioneer tools can also be seen on the vehicle's rear. Towards the front of the vehicle, the semicircular indentation housing a handle is the auxiliary generator and engine access door. This early machine features the spout-type rear fuel filler and the taillights, exterior fire extinguisher handles, and handle for the side engine access doors are all placed in indentations in the armor. Note the early placement of the handles for the rear doors. (Picture from TM 9-755B Full-Track Armored Infantry Vehicle T18E1.)

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Armored Infantry Vehicle M75 belonging to the US Army Armor and Cavalry Collection.

The revised fuel filler cover and taillight mounting can be seen on this example. The mechanism for the rear doors has also been moved outboard of the centered mechanism found in earlier vehicles.

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Armored Infantry Vehicle M75.

This upper view is of an early-production vehicle. The brush guard does not protect the engine exhaust pipe, and behind the exhaust pipe on the vehicle's right is the auxiliary engine access cover that was not needed on later vehicles that lacked the auxiliary generator. (Picture from TM 9-755B Full-Track Armored Infantry Vehicle T18E1.)

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Armored Infantry Vehicle M75.

The cover for the auxiliary engine is the focus of this image. (Picture from TM 9-755B Full-Track Armored Infantry Vehicle T18E1.)

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Armored Infantry Vehicle M75.

A cross-section of an early production machine is sketched here. (Picture from TM 9-755B Full-Track Armored Infantry Vehicle T18E1.)

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Armored Infantry Vehicle M75.

The commander was provided with six stationary vision blocks for use when his cupola door was closed. When the machine gun was mounted, the door could only be opened when the weapon was placed in the travel position, which is illustrated in the view above. (Picture from TM 9-755B Full-Track Armored Infantry Vehicle T18E1.)

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Armored Infantry Vehicle M75.

Details of the commander's machine gun mount are shown in this picture. (Picture from TM 9-755B Full-Track Armored Infantry Vehicle T18E1.)

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Armored Infantry Vehicle M75.

The large steering control lever pivoted as one unit, and driver's legs were placed between the arms of the control. The driver also had a horn switch just to the right of the right-hand steering lever arm. The large dial in the center of the instrument panel is the speedometer. (Picture from TM 9-755B Full-Track Armored Infantry Vehicle T18E1.)

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Armored Infantry Vehicle M75.

The driver's instrument panel is labeled here. Late-production vehicles would have a tachometer added to the lower right, while the other gauges and controls were repositioned. (Picture from TM 9-755B Full-Track Armored Infantry Vehicle T18E1.)

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Armored Infantry Vehicle M75.

The vehicle commander's seat had a total height adjustment of 16.25" (41.28cm) available by pulling the adjustment lever to the left and raising or lowering the seat. The emergency trip lever allowed the seat to be folded down when not in use. The platform was also adjustable by moving it rearward to disengage the two front detents, engaging the desired front detents, and then locking the rear detent with the labeled detent lever. (Picture from TM 9-755B Full-Track Armored Infantry Vehicle T18E1.)

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Armored Infantry Vehicle M75.

One of the passenger compartment rear doors is shown here, along with part of the bench seat offered for the infantry. The labeled door latch handles were used to turn the cams for the outside door latches that hold the doors open when engaged. Three longitudinal seats were provided for passengers; the left and right were fixed, but the center seat was removable to provide access to the fuel tanks under the passenger compartment floor. Late-production machines saw the cam system replaced with a simple latch at the outboard edge of the door. (Picture from TM 9-755B Full-Track Armored Infantry Vehicle T18E1.)

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Armored Infantry Vehicle M75.

The armament rack installed in the rear of the vehicle could hold eight rifles or carbines, two .30cal machine guns, or a mortar. The rear of the rack provided stowage for a rocket launcher, or a steam condenser case and water chest for a .30cal heavy machine gun. The center bench seat is visible in front of the armament rack. The seat cushion on this bench could be swung up to access stowage inside the base of the seat. (Picture from TM 9-755B Full-Track Armored Infantry Vehicle T18E1.)

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Armored Infantry Vehicle M75.

Two roof doors were provided for the passenger compartment, and these could be locked with 5" or 10" (13cm or 25cm) gaps or in the fully open position. The doors were locked in position by using the detent post. (Picture from TM 9-755B Full-Track Armored Infantry Vehicle T18E1.)

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Armored Infantry Vehicle M75.

The M75's engine and transmission are pictured here. The engine had overhead valves actuated by a single overhead camshaft for each cylinder bank. A single Stromberg float-type double-venturi downdraft carburetor was mounted. Bore and stroke were both 5.75" (14.6cm), its compression ratio was 6.5:1, and the engine could hold 12 gallons (45L) of oil. Dry weight with the flywheel and all accessories was 1856lb (841.2kg). Including the flywheel assembly, length was 49.24" (125.1cm), width was 50.72" (128.8cm), and height was 36.96" (93.88cm). (Picture from TM 9-755B Full-Track Armored Infantry Vehicle T18E1.)

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Armored Infantry Vehicle M75.

The suspension of an early-production machine is labeled. Note the four shock absorbers, and the reversed orientation of the rear road wheel swing arm compared to that found on the preceding wheel stations. The volute bumper springs were replaced by fixed steel stops in late vehicles. (Picture from TM 9-755B Full-Track Armored Infantry Vehicle T18E1.)

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Armored Infantry Vehicle M75.

Track tension was increased or decreased by adjusting the inner compensating arm, and the rear compensating idler was able to keep the track sufficiently tensioned while navigating terrain. Movement of the rear road wheel arm was transmitted to the inner compensating arm via the compensating link. When the rear road wheel passed over an obstacle, the upward movement of its arm swung the idler to the rear, keeping the track tensioned. As the rear road wheel arm returned to its rest position, the idler was brought forward again. (Picture from TM 9-755B Full-Track Armored Infantry Vehicle T18E1.)

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Armored Infantry Vehicle M75 at the Jackson Barracks, Louisiana.

This is a later-production M75. The access door to the right of the engine, in the sloping plate just behind the engine exhaust pipe, is flat. On earlier vehicles an auxiliary generator was included, and its engine was installed under this access panel, giving it a humped cross section. The driver's hatch is visible on the vehicle's front left corner. The hinges for and outline of the left passenger compartment roof door are just visible to the rear of the vehicle. The large engine access door in the hull front is apparent, and its exhaust pipe is protected by an extension to the right headlight cluster brush guard. The grille on the hull left side is for cooling air exhaust, and the small protuberance in front of this exhaust grille is for external activation of the vehicle's fire suppression system. This would have been found in an indentation on earlier machines. (Picture courtesy Vincent Scorsone.)

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Armored Infantry Vehicle M75 and Armored Personnel Carrier M59 belonging to the US Army Armor and Cavalry Collection.

An interesting comparison between the outgoing M75 and its replacement can be made here. Note the different side access hatch compared to the early machines, and the absence of shock absorbers on wheels two and four.

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Last updated 17 May 2021.
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