M-4 High Speed Tractor

The M4 18-ton High Speed Tractor was designed as a prime mover for towing large field artillery guns such as the 90mm Anti-Aircraft gun, the 155mm Long Tom, the 8in. Howitzer, or other heavy weapons (See the Towed Artillery Chart). In addition to moving the gun, the M-4 High Speed Tractor carried ammunition in cargo space racks. Ten men plus the driver could be carried. The M-4 HST was manufactured by Allis-Chalmers Mfg. Co. of Milwaukee, WI starting in 1942 and was in U.S. military service until approximately 1960.

The M-4 High Speed Tractor was equipped with air and electric brakes that would match any types of brakes on the towed load.

An anti-aircraft .50 cal. machine gun on a ring mount was accessed through a hatch above the crew compartment.

M-4 High Speed Tractor
M-4 High Speed Tractor

Today in WW II: 12 May 1941 Konrad Zuse, a German engineer working alone, completed the Z3, later determined to be the first fully operational electromechanical computer. Isolated by WW II, Zuse's work was unknown in the US and UK until after the war.  More 
12 May 1942 Second Battle of Kharkov, eastern Ukraine: Red Army offensive captures Kharkov from Germans who later encircle and destroy the Soviet forces [12-28 May].
12 May 1943 Organized Axis resistance in North Africa ends.
12 May 1943 Third Washington Conference, the Trident Conference between Franklin D. Roosevelt and Winston Churchill begins in Washington, DC [12-27 May].
Visit the Olive-Drab.com World War II Timeline for day-by-day events 1939-1945! See also WW2 Books.

Specifications of the M-4 High Speed Tractor

Crew Driver
Weight 31,500 lbs.
Height 7 ft, 10 in.
Width 8 ft, 1 in.
Length 17 ft, 2 in.
Engine Waukesha 145GZ 6 cyl. gasoline
Horsepower 210hp
Road Speed 35 mph
Range 180 mi.

M-4 High Speed Tractor Photos

Find additional photos and hi-res versions of the M-4 High Speed Tractor at the Olive-Drab Military Mashup.

M-4 High Speed Tractor Photo Gallery

>M-4 High Speed Tractor at Hampton Roads, VA, 16 August 1943
M-4 High Speed Tractor at Hampton Roads, VA, 16 August 1943.

An M-4 High Speed Tractor of the Seventeenth Field Artillery, supporting the First Marine Division, stopped by a river near Chunchon, Korea, 1950
An M-4 High Speed Tractor of the Seventeenth Field Artillery, supporting the First Marine Division, stopped by a river near Chunchon, Korea, 1950.

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