Caterpillar 637D '1975–85

 
 
 
 

Caterpillar 637E Series II Wheel Tractor-Scraper

Caterpillar 637E Series II Wheel Tractor-Scraper
 
 
 

Caterpillar 637G Open Bowl Scraper

Caterpillar 637G Open Bowl Scraper
Caterpillar 637G Open Bowl Scraper
Caterpillar 637G Open Bowl Scraper
 

Caterpillar 637K Open Bowl Scraper

Caterpillar 637K Open Bowl Scraper
 
 
 

WheelsAge.org '2005–pr.