At the end of 1975, the 1000 series was replaced by the 600 series models. A year later, a new cab was completed, representing the best of its time. The technology in the 600 series remained largely unchanged. Power steering was now also boosted in the smaller models, except for the 2600. Electricity was now produced by an alternator. The hydraulics were more efficient than before. Up to the 3600 model, the hydraulic pump was powered by a gear at the rear end of the camshaft, but it was now a gear-type pump. Additionally, in these models, the rear axle was implemented without reduction gears; the brakes were drum brakes, and the power take-off engagement was based on a dual clutch instead of the hydraulic multi-plate clutch used in the larger models.

In 1978, the lineup was complemented by the 54-horsepower 4100, which also had a 3.0-liter engine like the earlier 3055. Otherwise, the technology mostly corresponded to that of the 4600. To reduce the price, the 4100 was sold in Finland with the Syvänen cab. At the same time, four-wheel-drive models of the 3600 and 4600 were introduced, featuring a front axle manufactured by Carraro. The lifting capacity of the 4600 was increased in 1979.

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