The D51EX-22 and D51PX-22 crawler dozers from Komatsu America are mid-size machines designed to work in general construction, site preparation, home building, forestry, utility and quarry applications. Both standard (EX) and low-ground pressure (PX) models are equipped with Komatsu’s 6.69-liter, Tier-3-certified engine that offers 130 hp at 2,200 rpm. The units range in operating weight from 27,778 to 28,881 pounds, depending on the machine version. The steering system provides smooth agile movement when dozing, even in gradual turns, allowing the dozers to approach objects accurately in corner grading and sidewall operations. Selection of either variable or Quick-shift speed control allows the dozers to run efficiently during fine or rough grading operations with optimal travel speeds to match job conditions and operator preferences. The D51-22 units also feature an extended undercarriage life with the auto-adjusting front idler guide, large links and large-diameter bushings for reduced undercarriage-maintenance costs.