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Caterpillar D7R

Bulldozer

Caterpillar D7R

The Caterpillar D7R bulldozer is a commercial design, modified to suit military needs

 
 
Country of origin United States
Entered service 1996
Crew 1 men
Dimensions and weight
Weight 27 t
Length ~ 6.9 m
Width ~ 3.7 m
Height ~ 3.4 m
Performance
Earth working capacity ?
Towed load 35 ~ 40 t
Mobility
Engine Caterpillar diesel
Engine power (D7R Series II) 240 hp
Maximum road speed ~ 15 km/h
Range ?

 

   The Caterpillar D7R is a commercial bulldozer, that is widely used by the US military. This machine was designed and built in the United States. It follows the line of the Caterpillar D7 series bulldozers, that first appeared in 1938 and with constant improvements are produced ever since. These bulldozers are used by all branches of the US military. The Caterpillar D7R medium bulldozer was introduced in 1996. In the mid 2000s it was replaced in production by improved D7R Series II. These replaced in US service the older D7G and D7H bulldozers. Currently Caterpillar military products are offered by a subsidiary Caterpillar Defense & Federal Products company.

   The Caterpillar does not manufacture any special militarized version of the D7R bulldozer. However after some modifications this earthmoving machine is employed for military applications. Modifications include transport provisions, blackout lights, military paint, keyless ignition and so on.

   The D7R has an elevated sprocket undercarriage, that is more durable and efficient during earthmoving. Such undercarriage was present on the previous D7H model. Due to its elevated nature the operator's station provides excellent observation of the blade and rear of the machine. Operational weight of the dozer is 27 t. The improved D7R weights 25 t.

   Main role of the Caterpillar D7R bulldozer is earthmoving. It is used for construction of defensive positions, anti-tank ditches, construction of obstacles, obstacle clearing, route opening, demolition of structures, and recovery of stuck combat vehicles. Once fitted with an armored cab and special mine flail, the D7R can even clear minefields.

   This bulldozer is equipped with a detachable blade. Various blades can be fitted. The most common is a universal blade with side wings, which allows to carry more material. Also there are straight blades without side wings for fine grading, angle blades, two-way blades and so on. The D7R dozers are often fitted with a rear-mounted rake attachment.

   The D7R dozer can also perform recovery and towing operations. It can tow combat vehicles with a maximum weight of around 35-40 t.

   For operation in hostile or combat areas, the Caterpillar D7R dozers can be fitted with armored cabs. These add-on cabs are mounted on vehicle's frame and require no modifications to the vehicle structure. The armored cab provides protection from small arms fire, artillery shell splinters and mine blasts. Some dozers even have armored engine compartments. Additional armor reportedly has no effect on the overall earthworking performance.

   The D7 dozer is operated by a single operator. This machine carries no defensive armament. Even versions with armored cabs are normally unarmed.

   This earthmoving machine is powered by a Caterpillar diesel engine. The improved D7R Series II dozer is powered by a 258 hp engine, that had 240 hp power at the flywheel. Due to its low mobility the D7R bulldozer must be transported on trailer between mission sites.

   In the US military service a couple of Caterpillar D7R bulldozers are typically assigned to combat engineer companies.

   The D7R is in the middle of the Caterpillar's bulldozer range. The smallest are D3 dozers, while the largest are D11 series dozers.

 

Variants

 

   Caterpillar D7R Series II is an improved version produced since the mid 2000s. It is the latest model used by the US military. It is powered by a 240 hp engine and weights around 25 t. Armored versions of this dozer are used by Egypt.

   Caterpillar D7E was first introduced in 2008 and replaced in production the previous D7R Series 2 in 2009. It is a current production version, proposed to commercial operators. This machine has electric drive system. The dozer has a 240 hp engine, which powers a pair electric drive motors. Compared to the previous D7R Series II it is 25% more fuel efficient.

 

 
Caterpillar D7R

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Caterpillar D7R

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Caterpillar D7R

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Caterpillar D7R

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Caterpillar D7R

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Caterpillar D7R

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Caterpillar D7R

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