Two Series-4 crawler dozers have been introduced to the North American market. The PR 724 Litronic and PR 734 Litronic have operating weights of 35,264 and 48,490 pounds and horsepower ratings of 160 and 200, respectively. Both machines have Liebherr's new hydrostatic driveline, controlled by the company's fourth-generation Litronic system, which has the capacity to match steering response to travel speed. The efficiency of the new drive system, according to the company, also improves fuel economy.
