In 1956, David Brown introduced the 900, equipped with a 2.7-liter four-cylinder engine as the successor to the 25D, which was known in some countries as the 40D. Its power output in diesel was 40 hp. The fuel system was based on a distributor pump. A dual clutch was available as an option. The frame and control arms were stronger than those of previous models, and the wheelbase was longer. This model suffered from reliability problems.

In 1958, alongside the 900, a 45-horsepower 950 was introduced. Apart from a reinforced frame, increased power, and improved steering, the technology was almost unchanged. Similar upgrades were also made to the 900. In the 950, the rims and grille changed from gray to yellow. The following year, the 950 was replaced by the 950 Implematic, which featured a more advanced power take-off system. At the same time, a smaller 850 Implematic was introduced alongside it. These models were equipped with a differential lock. The base model of the 850 had some equipment trimmed, such as the instrument cluster and foot throttle. In the USA, the 850 and 950 were known as the Oliver 500 and 600.

In 1962, the updated models 880 and 990 were introduced. The 880 initially had a 4-cylinder engine (43 hp). In 1964, it was replaced by a 2.5-liter 3-cylinder engine (48.5 hp). The 990 had a power output of 55 hp. The range of motion of the lifting device was wider than before. From 1963 onwards, a 12+4 transmission was available as an option, with the lowest gear speed at the level of a crawl gear. At the same time, the 990 was updated: the wheelbase was extended, the front axle was strengthened, the battery was moved forward, and the hydraulics were improved. In 1964, the lineup was complemented by the 35-horsepower 770, which featured Selectamatic hydraulics from the start, a system that was introduced to the other models only a year later.

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