The 620 K-Series wheel tractor scrapers—621K, 623K, and 627K—refine the design of the H-Series predecessors, which introduced features such as Sequence Assist and Load Assist that automate cycle functions for optimum production and operator convenience. Features include high-pressure steering, engine over-speed protection, tire-spin reduction, differential-lock engagement protection, machine/ground-speed control, and payload estimator. Caterpillar Inc. www.cat.com

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