In the summer of 1965, completely new German models 523 and 624 were introduced. The first digit of the model number indicated the power category, the middle digit the country of manufacture, and the last digit the number of cylinders. The tractors had angular designs. The engines were completely new direct injection diesels. The new French-made 8+4 gearbox developed by ZF was fully synchronized, and the optional Agriomatic S version featured a hydraulic quick shift and reverse function. A PTO operating at 1000 rpm, implemented on a separate shaft, was available as an option, as was hydrostatic steering. In 1967, four-wheel-drive versions equipped with ZF axles were introduced.

In 1969, the 724 was introduced with a new 3.9-liter engine producing 67 hp. The engine included two additional balance shafts to dampen vibrations. In 1971, the line was complemented by the 75-horsepower 824. In Finland, models 523 and 623 were imported at the end of the 1960s, and models 724 and 824 in the early 1970s, whose power was reported in Finland as peak power (75 hp for the 724 and 80 hp for the 824) instead of using the DIN standard. Tractors in Finland were equipped with Horsma or Siro cabs.

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