651 scraper Caterpillar dual axleThe Caterpillar 651 scraperContrafed PUblishingMarch 1, 2016February 24, 2022 by Contrafed PUblishingMarch 1, 2016February 24, 2022 This month we have a closer look at the largest two-axle, single-engined scraper that Caterpillar has produced so far. by RICHARD CAMPBELL Designed for fleet...