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1935: RD8 (132 hp [98 kW]) introduced. 1937: The "R" prefix dropped, D8 debuts. 1940s: D8 2U Series (148 hp [110 kW]) introduced; 1950: D8 new front-rounded grill that would last until D8K was replaced by D8L in 1982.
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.
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 ...
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 ]
The 410 hp (310 kW) D9T replaced the D9R in 2004. The D9T has a low-emissions ACERT diesel engine. The current model is the D9T; however, older models such as the D9R, D9N, and D9L are still commonly used. The L, N, R, and T models of the D9 are visually very similar, differing primarily in the design of their internal systems.
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.
Caterpillar Inc., also known as Cat, is an American construction, mining and other engineering equipment manufacturer. [6] The company is the world's largest manufacturer of construction equipment. [ 3 ] [ 7 ] [ 8 ] In 2018, Caterpillar was ranked number 73 on the Fortune 500 list [ 9 ] and number 265 on the Global Fortune 500 list. [ 10 ]