CaterpillarClassic MachinesThe Caterpillar 631B scraperContrafed PUblishingJanuary 26, 2016September 24, 2024 by Contrafed PUblishingJanuary 26, 2016September 24, 2024 Of all the motor scrapers that Caterpillar has produced through the years, perhaps the most popular in terms of worldwide unit sales is the model...