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Caterpillar first introduced the RD4 in 1936, [1] as the diesel follow on to the successful CAT 30 gas model. The RD4 originally weighed in at 10,000 pounds (4,500 kg), and used Caterpillar's D4400 engine, an inline four-cylinders, with a 4.25 by 5.50 inches (108 mm × 140 mm) bore and stroke. [ 2 ]
D5N was replaced with the D6K low drive hystat dozer, becoming the D4 in 2021; D5 D5LGP (current version) released in 2019, as a replacement for the D6N. High drive power shift dozer. The following models originated with the MHI (Mitsubishi Heavy Industries) partnership, providing smaller, low drive dozers, in the 20,000 lb range.
1987: D8N (285 hp [213 kW]) with differential steer transmission, the first track-type Caterpillar tractor to have one (the new D8N was smaller than the old D8L size, which was replaced by the new D9N model). 1996: 305 hp (227 kW) D8R replaced D8N. 2000: D8R Series 2 replaced the D8R. 2004: 310 hp (230 kW) D8T ACERT replaced D8R Series 2. [1]
The D11R now weighed 230,935 lb (104,750 kg). The Carrydozer version has a special blade with a curvature that allowed 57 cy ( 43.6 m³) to be pushed. This blade design was introduced by Komatsu on their D575 A-2 dozers in 1995 as the Superdozer version. The deeper curvature of the Carrydozer/Superdozer blades literally carry the dirt moved ...
The D6R replaced the D6H in 1996, and came in five models ranging from the 165 hp (123 kW) D6R to the 175 hp (130 kW) D6R XL and XR, and the 185 hp (138 kW) D6R XL (IG) and D6R LGP. All used the Cat 3306T 6-cylinder engine. The D6M XL and D6M LGP versions with 140 hp (100 kW) weighed 33,200 and 36,400 pounds (15,100 and 16,500 kg).
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 370 hp (280 kW) D9N replaced D8L in 1987 (this was due to a model number/size adjustment by Caterpillar in their larger bulldozer lineup at the time, allowing them to introduce a smaller D8N model below the larger D8L size). Due to the model adjustment, the D9L is the most powerful D9 in history, with a flywheel power of 460 hp (340 kW).
Introduced in 2001 as the successor to the D575A-2 SD Super Dozer, the D575A-3 SD Super Dozer is a dedicated dozer with no ripper weighing 152,600 kilograms (336,400 lb). Equipped with a standard blade, the D575A-3 SD is capable of moving up to 90 cubic yards (69 m 3 ) of material per pass, however, when equipped with an optional blade, the ...