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Caterpillar D8
Cat D8H at Driffield-P8100563.JPG
Caterpillar D8H
Model history
Model introduced Unknown
Model discontinued Unknown
Model status Unknown
Fuel type Diesel
Power hp Unknown
Cooling system Water
Transmission Details
Transmission type Unknown
Drive tracked
Linkage Category Unknown
Other info
Factories USA
Glasgow, UK
Plow rating Unknown
Web site
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The Caterpillar D8 is a large track-type tractor designed and manufactured by Caterpillar in the USA and at Glasgow in the UK.

Though it comes in many configurations it is usually sold as a bulldozer equipped with a detachable large blade and a rear ripper attachment.


A Caterpillar D8N with single shank ripper on a British Coal site in 1988. The D8N was the first D8 series with the raised sprocket design

  • 1935: Caterpillar RD8 introduced.
  • 1937: The "R" prefix dropped, D8 debuts.
  • 1940s: 2U Series D8 introduced; 132 hp (98 kW) improved to 148hp.
  • 1950: D8 new front-rounded grill that would last until D8K was replaced by D8L in 1982.
  • 1955: 1H Series D8 ends production; 191 hp (142 kW) D8E and D8D introduced with new 1,246 cubic inch displacement (CID) D342 diesel engine. D8D had a torque converter and D8E had a direct drive transmission.
  • 1956: D8D replaced by D8G; D8E replaced by D8F.
  • 1958: 225 hp (168 kW) D8H introduced.
  • 1965: Horsepower increased to 270 hp (200 kW)
  • 1974: 300 hp (220 kW) D8K replaced D8H.
  • 1982: 335 hp (250 kW) D8L replaced D8K. The D8L was the first D8 with the elevated drive sprocket undercarriage.
  • 1984: D8L SA (special application) for farming applications premiers.
  • 1987: D8N at 285 hp (213 kW) which was unveiled at CONEXPO '87 in Las Vegas, Nevada. It also had a differential steer transmission which was the first Caterpillar track-type tractor in history to have this type of transmission.
  • 1996: 305 hp (227 kW) D8R replaced D8N.
  • 2000: D8R II replaced the D8R.
  • 2004: 310 hp (230 kW) D8T ACERT replaced D8R Series II.


Cat D8H with Winch unit

Several types of bulldozer blade can be used on the front of the tractor:

  • A straight blade ("S-Blade"): A short blade and has no lateral curve, no side wings, and can be used for fine grading
  • An angle blade: Is held by an U shape frame that has 3 holes on each side, to set the blade to 3 positions: to the right, center, and left.
  • A universal blade ("U-Blade"): A tall and very curved blade, and has large side wings to carry more material
  • An "S-U" combination blade: A shorter blade, with less curvature, and smaller side wings

Various other blade types are used including landfill U-Blades, woodchip U-blades, and two-way blades for work inside the holds of ships.

See also


  • Wikipedia

External links

Caterpillar D-Series Track-Type Tractors - Official Caterpillar website

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