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Caterpillar D7 (Side view, right side)

 
 

  Side view, right side

Picture courtesy of Verner Rasmussen, Vallensbaek.

 

Danish Army Specific: 7 tractors including low-bed trailers received as MAP materiel in 1952. 2 nearly identical versions, 3T1 and 17A1, were received.
Historical
: The Caterpillar D7 was introduced as model in 1938, and was equipped with the six-cylinder D-8800 engine which developed 92 hp. The 20 inch wide tracks were driven through a 5-speed gearbox. Maximum drawbar pull was 10 tons.
US Army designation for the D7, which was a standard M1 heavy crawler, was "Tractor, Full-Tracked, Low-Speed, DED, Medium DBP". Used for general bulldozing, pan pushing, tree dozing, scraper towing and other types of construction work.
The 3T1 version, which was produced between 1944 and 1955, was US Army's standard dozer widely used in all theatres during WW II.
Apart from the above mentioned tasks, the D7 could be used as tractor for a 240 mm howitzer and 155 mm field gun.
Demand for the D7 was such that some 1000 examples were also produced by American Car and Foundry to supplement production from Caterpillar´s East Peoria plant.
The D7 and D8 tractors were frequently fitted with armoured cabs that allowed them to be used by US Army Engineers working in hostile environments. Among others, the Union Metal Manufacturing Company produced a purpose-built armoured cab for the two machines which gave protection against small arms fire and shell splinters.
Similar machines were build by Allis-Chalmers, Cleveland and International-Harvester.
Length: 4.10 m (160 inches), w/dozer 5.80 m (226 inches).
Width: 2.50 m (97 inches), w/dozer 4.10 m (160 inches).
Height: 2.44 m (96 inches).
Weight: 14.341 kg (31.870 lb.).
Engine
: Caterpillar 4-cylinder, type D8800, 13.618 cm3 (831 cubic inches) liquid cooled.
Horsepower: 92 at 1.050 rpm.
Transmission: 5-speed.
Transfer case: 2-speed.
Electrical system: 6 volt.
Brakes: Mechanical.
Fording depth:
without preparation: N/A.
Tyres: None.
Fuel type: Diesel.
Fuel capacity: 246 liter (54 gallons).
Range: N/A.
Crew: 1.
Additional: A 2-cylinder vertical gasoline engine was fitted to the left hand side of the diesel engine. This starting engine could be started from either top of engine hood, from the front or from side.  The starting engine exhaust pipe provide preheating for main engine intake air. The machine are fitted with Le Tourneau cable controls: Either a front mounted single drum cable control for bulldozer only or a rear mounted double drum cable control for scraper alone or bulldozer.  Some machines with front cable control have rear mounted Hyster D7N 15 ton winch .
Variants:
Caterpillar D7C (155 kb)


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