Caterpillar DW21 '1950–59

 
Caterpillar DW21 '1950–59
 
 

In late 1950 Caterpillar introduced the DW20 and DW21 self-propelled scrapers. The DW20 had a two-axle tractor configuration, and the DW21 used a single-axle tractor design. They were first publicly unveiled at the construction equipment Road Show, held in Chicago, Illinois, in August 1948. In 1955, the DW21 was upgraded into the DW21C.

Caterpillar 631A '1960–62

Caterpillar 631A '1960–62
 
 
 

Caterpillar 657 '1962–69

Caterpillar 657 '1962–69
Caterpillar 657 '1962–69
 
 

Caterpillar 3D01 Light Weight Scraper '1965

Caterpillar 3D01 Light Weight Scraper '1965
 
 
 

Caterpillar 633 '1966–????

Caterpillar 623, Caterpillar 633, Caterpillar 600-Series Scrapers
Caterpillar 623, Caterpillar 633, Caterpillar 600-Series Scrapers
 
 

Elevating scraper.

Caterpillar 623 '1972–73

Caterpillar 623, Caterpillar 633, Caterpillar 600-Series Scrapers
Caterpillar 623, Caterpillar 633, Caterpillar 600-Series Scrapers
 
 

Caterpillar 621G '2000–????

 
Caterpillar 621G '2000–????
 
 

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