In the autumn of 1989, the small DX4 models were replaced by the new DX 4.31 and 4.51 models. The 78-decibel noise level of the StarCab cab, familiar from the DX3 series, was significantly lower than before. Changes were also made to facilitate entry and improve ventilation. As optional extras, the Agrotronic-i monitoring system and an onboard computer were available. Efforts were made to improve the engine's torque characteristics, but the maximum torque was still achieved at relatively high engine speeds.

The 6.06, the successor to the 6.05, was introduced as the third model. At the end of 1991, the range was supplemented with the 4.56 and 6.16 models, and the lineup was named AgroPrimo, dropping the DX designation. The color of the cab roof section changed from green to light gray, and the cab equipment was improved. The transmission was now 18+6 also in the two-wheel-drive models. The new arrivals were somewhat compromised in certain respects, as better-equipped models were also available in the same power class. Of the AgroPrimo models, only the two smallest had viscous fans, and only these models could be equipped with air conditioning. In the larger models, tire sizes and lifting capacities were smaller than in the previous models.

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