The MF 1505 and 1805 models were replaced in 1978 by the 4840 and 4880, equipped with Cummins 14.8-liter engines (265/320 hp). A couple of years later, the series was complemented by the 4800 and 4900 at the lower and upper ends (225/375 hp). This marked the first time MF became a maker of large four-wheel-drive tractors, with only Steiger offering a more powerful model.

The biggest innovation of the 4800 series was the power lift, which was the world's first to be offered as standard equipment (in the same year, it was available only as an option on the Fendt Favorit). Unlike most power lifts on large tractors, the lift was also equipped with draft control. The transmission was either a mechanical 12+4 or an 18+6 with a 3-speed powershift. The cab was spacious and quite advanced compared to previous models.

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