By Katie Weiler, Managing Editor | September 28, 2010

CaterpillarDesign enhancements have been made to the 621G, 623G and 627G scrapers, with a new tractor engine (the Cat C15 with ACERT technology), a new cooling system that's less susceptible to clogging, improved serviceability features, and electrical-system changes aimed at increased reliability. The C15 engine, which replaces the previous 3406E, is Tier-3 emissions compliant and retains its predecessor's dual-horsepower capability.