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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: 22 Sep 1943 Operation TOENAILS completed, with the occupation by US troops of all important islands in the New Georgia group, Central Solomons.   

Specifications of the M-4 High Speed Tractor

CrewDriver
Weight31,500 lbs.
Height7 ft, 10 in.
Width8 ft, 1 in.
Length17 ft, 2 in.
EngineWaukesha 145GZ 6 cyl. gasoline
Horsepower210hp
Road Speed35 mph
Range180 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 from 10th AAA Group, used as a prime mover for 120mm AAA, Korea, 1950.
Prime mover towing an 8-inch howitzer near Manhay, Belgium, Deceober, 1944.
Allis Chalmers M4 18-ton high speed tractor w/winch, prime mover for the 90mm AA gun, 155mm Gun (Long Tom), 8-inch howitzer M1 and others.
M4 18-ton High Speed Tractor with towed 8-inch howitzer, 999th FA Bn (Colored), Nantes-Gassicourt, France, 20 August 1944.
M5 tractor (left with cover and ring mount removed) and M4 tractor (right), prime movers for heavy towed artillery.
105th FA Bn, M1 8-inch howitzer towed by M4 High Speed Tractor (HST) near Carentilly, France, 31 July 1944.

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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