Classic Machines ScrapersClassic Machines: The Caterpillar 651 scraperContrafed PUblishingMarch 1, 2016December 4, 2019 by Contrafed PUblishingMarch 1, 2016December 4, 2019 With the arrival here recently of two secondhand Cat 651Bs, the time is probably right to have a closer look at the largest two-axle, single-engined...