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Caterpillar offers three members of the K-Family of track-type tractors — the D3K, D4K and D5K. This crawler dozer family delivers best-in-class productivity and performance from first cut to finish grade. The new models feature a larger, quieter cab and intuitive, seat-mounted controls to improve operator comfort and productivity. The machines can be shipped from the factory ready to accommodate the AccuGrade system, an exclusive Cat blade control solution that allows fast, precise grading. They can also be equipped with SystemOne undercarriage, a Cat innovation that offers long life and greatly reduced maintenance time and costs. The tractors also feature engine power increases ranging from 5 to 7 percent for higher productivity. The Cat C4.4 engine with ACERT Technology powers the D3K (74 hp/55kW), D4K (84 hp/63 kW) and D5K (96 hp/72kW). The engine meets U.S. EPA Tier3 certification requirements while offering outstanding performance, life and fuel economy.