Michigan scrapers were initially sold in three basic sizes: models 110, 210 and 310 with 10-, 18- and 27-cubic-yard heaped capacities. In the mid-1950s, before the advent of articulated dump trucks ...

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 new Cat 621H, 623H and 627H wheel tractor-scrapers feature a more powerful engine in the tractor, and a more powerful engine in the scraper of the 627H. The Cat C13 engine in the tractor produces ...