The Caterpillar D9 is a large track-type tractor designed and manufactured by Caterpillar Inc. It is usually sold as a bulldozer equipped with a detachable large blade and a rear ripper attachment.
Caterpillar D9
D9H
CAT D9L, the first D9 model to employ the "high drive" configuration. 'High drive" refers to the position of the drive sprocket. The triangular track shape is caused by the need to accommodate the drive sprocket, which is mounted high on the machine relative to ground level and higher than previous existing designs.
A Caterpillar D9N on a beach
Caterpillar Inc., also known simply as CAT, is an American construction, mining and other engineering equipment manufacturer. The company is the world's largest manufacturer of construction equipment.
In 2018, Caterpillar was ranked number 73 on the Fortune 500 list and number 265 on the Global Fortune 500 list. Caterpillar stock is a component of the Dow Jones Industrial Average.
Former headquarters in Peoria, Illinois
Benjamin Holt, one of the founders of Holt Manufacturing Company
The Holt 75 model gasoline-powered Caterpillar tractor used early in World War I as an artillery tractor. Later models were produced without the front "tiller wheel", c. 1914.
The Holt Caterpillar Co. factory in East Peoria, Illinois, in 1910. Tractors were assembled in place before assembly lines were introduced. Holt bought the plant from the bankrupt Colean Manufacturing Co. in 1910.
