155mm Gun Motor Carriage M12.

The relation of the M12 to the medium tank M3 is apparent when one sees the suspension and the three-piece final drive and differential housing. (Picture from TM 9-751 155-mm Gun Motor Carriage M12 and Cargo Carrier M30.)

Home       Vehicle list       Top





155mm Gun Motor Carriage M12 belonging to the US Army Ordnance Museum.

The travel lock is raised on this vehicle, but the ordnance is not stowed in it.

Home       Vehicle list       Top





155mm Gun Motor Carriage M12 belonging to the US Army Ordnance Museum.

A ventilator is placed on the front of the vehicle between the drivers' hatches, and the siren would normally be mounted directly behind this ventilator. The right-hand headlight is also missing. The gunner's position was to the gun's left, and his shield can be seen towards the rear of the gun.

Home       Vehicle list       Top





155mm Gun Motor Carriage M12 belonging to the US Army Ordnance Museum.

The drivers were provided with top-hinged hatches that opened upwards, and these had direct vision slots in them. A closer look at the gun travel lock, ventilator, and headlight mounts can be seen here. Track spades are stowed on the right front fender; these were placed in front of the tracks when the vehicle was ready to fire.

Home       Vehicle list       Top





155mm Gun Motor Carriage M12.

The carriage's engine was moved from the rear in the medium tank to just behind the drivers' compartment, leaving the back of the vehicle free for the gun mount. (Picture from TM 9-751 155-mm Gun Motor Carriage M12 and Cargo Carrier M30.)

Home       Vehicle list       Top





155mm Gun Motor Carriage M12 belonging to the US Army Ordnance Museum.

Seats for two crewmen were mounted on the left rear corner of the vehicle, and their position is revealed by the vertical extension to the hull side. This vehicle is equipped with the heavy-duty suspension bogies, and the repositioned engine's exhaust was rerouted to exit between the center and rear bogies on each side.

Home       Vehicle list       Top





155mm Gun Motor Carriage M12.

The crew seats mentioned above can better be seen in this top-down view. (Picture from TM 9-751 155-mm Gun Motor Carriage M12 and Cargo Carrier M30.)

Home       Vehicle list       Top





155mm Gun Motor Carriage M12.

The recoil spade is shown here in the stowed position. (Picture from TM 9-751 155-mm Gun Motor Carriage M12 and Cargo Carrier M30.)

Home       Vehicle list       Top





155mm Gun Motor Carriage M12 belonging to the US Army Ordnance Museum.

The vehicle's spade would normally be retracted to a more vertical position as shown above. Seating for two more crewmen was provided on the spade itself.

Home       Vehicle list       Top





155mm Gun Motor Carriage M12.

The vehicle is shown ready to fire, with the rear spade deployed and the track spades in front of the tracks. (Picture from TM 9-751 155-mm Gun Motor Carriage M12 and Cargo Carrier M30.)

Home       Vehicle list       Top





155mm Gun Motor Carriage M12.

Details of the rear spade winch are shown here. The spade was lowered with the brake lever once the support arms had been released, then raised using the winch crank when the vehicle was prepared to move. After the winch was lowered, the vehicle was to be reversed until the prongs were forced into the ground. The steps on the spade were horizontal when it was properly emplaced. (Picture from TM 9-751 155-mm Gun Motor Carriage M12 and Cargo Carrier M30.)

Home       Vehicle list       Top





155mm Gun Motor Carriage M12.

The driver's controls are shown here. As can be imagined, operating the M12 was similar to driving the medium tank on which it was based. (Picture from TM 9-751 155-mm Gun Motor Carriage M12 and Cargo Carrier M30.)

Home       Vehicle list       Top





155mm Gun Motor Carriage M12.

The engine compartment covers and guards are shown here, looking forward from the rear compartment. The drivers' hatches can be seen at the top of the image. (Picture from TM 9-751 155-mm Gun Motor Carriage M12 and Cargo Carrier M30.)

Home       Vehicle list       Top





155mm Gun Motor Carriage M12.

The engine covers have been removed in this image, revealing the radial engine. The front of the vehicle is again to the top of the image. (Picture from TM 9-751 155-mm Gun Motor Carriage M12 and Cargo Carrier M30.)

Home       Vehicle list       Top





155mm Gun Motor Carriage M12.

Details of one of the steering brake bands are shown here. (Picture from TM 9-751 155-mm Gun Motor Carriage M12 and Cargo Carrier M30.)

Home       Vehicle list       Top





155mm Gun Motor Carriage M12.

This phantom view shows interior details of the gun breech. The gun's maximum horizontal range was ~20,000yd (~18,000m). The complete gun weighed 8,715lb (3953kg) and had a length from the muzzle to the rear face of the breech ring of 232.87" (291.49cm). (Picture from TM 9-751 155-mm Gun Motor Carriage M12 and Cargo Carrier M30.)

Home       Vehicle list       Top





155mm Gun Motor Carriage M12 belonging to the US Army Ordnance Museum.

Details of the gun mount M4 can be seen in this image. The engine air cleaners were mounted at the front of the fighting compartment near the repositioned engine, and stowage for ten 155mm rounds was provided in the fighting compartment. Four projectiles were stowed in the floor on the right side of the compartment, and the location of some of these can be seen here.

Home       Vehicle list       Top





155mm Gun Motor Carriage M12.

Further details of the gun mount and rear stowage are shown here. The gun mount was designed to give the vehicle the lowest center of gravity possible. (Picture from TM 9-751 155-mm Gun Motor Carriage M12 and Cargo Carrier M30.)

Home       Vehicle list       Top





155mm Gun Motor Carriage M12.

The telescope M53 was used to place the gun in azimuth and elevation in direct fire against fast-moving targets. The quadrant sight M1918 or M1918A1 was used with the panoramic telescope M6 to place the gun in azimuth and elevation for indirect fire. A 14" (36cm) extension allowed this telescope to see over the gun shield. (Picture from TM 9-751 155-mm Gun Motor Carriage M12 and Cargo Carrier M30.)

Home       Vehicle list       Top


Last updated 11 Jul 2015.
Questions? Comments? Corrections? Email me
© Copyright 2012-5 Chris Conners