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Caterpillar D7
Two armored D7 bulldozers out on a mission in Ramadi, Iraq.
Type
Bulldozer
Manufacturer
Caterpillar
Production
1938–present
Length
160 in (410 cm)
Width
97 in (250 cm)
Height
96 in (240 cm)
Weight
31,870 lb (14,460 kg)
Propulsion
Tracks
The new Cat D7E with diesel-electric DriveUSMC D7GD7 armored bulldozer on flatbed truck for transport
The Caterpillar D7 is a medium track-type tractor manufactured by Caterpillar Inc. and most commonly used as a bulldozer.
The D7 was first manufactured in 1938. A series of improved models were later produced, including the D7C in 1955, the D7D in 1959, the 160 hp (120 kW) D7E in 1961, the 180 hp (130 kW) D7F in 1969 and the 200 hp (150 kW) D7G in 1974. In 1986 the 215 hp (160 kW) D7H was the first D7 equipped with Caterpillar’s elevated drive sprocket undercarriage. The D7R replaced the D7H in 1996, followed by the D7R Series 2. The electric drive D7E entered service in early 2009, returning to a traditional ‘flat-track’ configuration for this iteration only. The high-drive design returned in 2020 with the introduction of the D7 (forgoing a generational letter under Caterpillar’s new naming system).[citation needed]
In March 2008, at Conexpo 2008 held every 3 years in Las Vegas, Caterpillar introduced the D7E. This 235 hp (175 kW) D7E comes with a diesel-electric drive system powered by a 537cid C9.3 diesel engine. The C9.3 powers a generator that turns out electricity that supplies power to a pair of AC drive motors. Compared to the Caterpillar D7R Series II, the D7E was projected to deliver 25 percent more material moved per gallon of fuel, 10 percent greater productivity and 10 percent lower lifetime operating costs.
The D7R Series II at 240 hp (180 kW) power and an operating weight of around 20 tons, is in the middle of Caterpillar's track-type tractors, which range in size from the D3 77 hp (57 kW), 8 short tons (7.3 t), to the D11 935 hp (697 kW), 124 short tons (112 t). It is primarily used to move material short distances or through challenging terrain. The vehicle is powerful, yet small and light (16 to 20 short tons [15 to 18 t]) depending on configuration). This makes it ideal for working on very steep slopes, in forests, and for backfilling pipelines safely without risking damage to the pipe.
An agricultural version without the blade and rippers is commonly used by farmers.
Specially modified D7E's fitted with Rome plows were used to clear forest in the Vietnam War.[1]
The US Army used armored D7G to clear mine fields and unarmored D7G and D7H for earthworks. The armor was developed by the Israel Military Industries (IMI). Later, the US Army developed a remote controlled version of the D7G for mine-clearing applications.
The United States Marine Corps replaced its fleet of D7Gs with John Deere's 850J MCT in 2009.
The Egyptian Army operates an unknown number of armored D7R II.[citation needed]
^Rottman, Gordon L. (2 Apr 2008). The US Army in the Vietnam War 1965–73. Battle Orders 33. Osprey Publishing. p. 59. ISBN 9781846032394.
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