The Caterpillar 633 was an elevating scraper built by Caterpillar Inc. It was introduced in 1966 and superseded by the Caterpillar 633D in 197?
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Caterpillar Experimental and specials
Holt 120 Long-Track · Caterpillar 659 Cross Belt Loader · Caterpillar LWS · Caterpillar 783 Side-dump · Caterpillar 786 (coal hualer) Caterpillar 988 Track Loader · Caterpillar 988 Carry Loader · Caterpillar Quad-Trac · Caterpillar SxS D9G ·