657 & 657B scraper Caterpillar dual axle ScrapersThe Caterpillar 657 and 657B scrapersContrafed PUblishingSeptember 20, 2021February 23, 2022 by Contrafed PUblishingSeptember 20, 2021February 23, 2022 Creating quite a stir when it was first announced, the Caterpillar 657 has been the backbone of large capacity scraper fleets since 1962 and remains...