The H Series wheel tractor-scrapers include the 621H single-engine, open bowl machine, the 623H with elevating scraper and a single engine and the open-bowl 627H with twin engines and all-wheel drive.
The single engine Cat 651 Wheel Tractor Scraper (WTS) reenters the market with upgrades to the powertrain, controls, hydraulics and structure, designed to deliver enhanced levels of productivity.