In 1972, the Hürlimann D 200 was replaced by the D 210. The most significant changes were an increase in engine power to 77 horsepower and a more efficient lifting device. A synchromesh transmission (12+6) was standard. In 1973, the D 180 and D 310 were introduced alongside it, also available with a 10+2 transmission. In 1975, a turbocharged version of the 310 was offered, with a power output of 100 hp. The 40-liter fuel tanks were really small for a tractor of this size. At the top of the model range was the 135-horsepower D 550, whose production remained limited to just a few units. The D 550 featured a hydrostatic drive transmission.

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