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Introduced in 1942, the Hanomag R40 was a completely redesigned tractor model except for the engine; it belonged to the large size class that had characterized nearly all previous Hanomag tractors. In appearance, it was considerably more modern than earlier Hanomags. The 5.2-liter water-cooled pre-chamber diesel engine had already been in use since 1931. The 5+1 gearbox was developed in collaboration with Famo. Hanomag also cooperated with Famo in the development of crawler tractors.

Hydraulics were not available. A typical feature of the Hanomag was a rain canopy with a windshield. In the J version, starting was accomplished with a gasoline engine instead of an electric starter. From 1948 onwards, a C version intended mainly for road use was produced, with a top speed of 25 km/h. A total of 12,000 R40 units were produced.

Alongside the R40, the smaller R25 was introduced in 1949, equipped with a 1.9-liter four-cylinder engine. This engine also originated from the pre-war period and proved to be very weak in its higher-tuned variants. The R25 was the first Hanomag tractor available with a hydraulic lift. The R25 A had narrow 40″ rear wheels and the R25 B had wider 24″ wheels. A year later, a new 2.8-liter four-cylinder engine, which clearly had more torque, became available for the R25. The new engines were fitted free of charge to the previous year's models under warranty. The high-wheeled model was now called R25 C, and the low-wheeled model R25 D.

In 1951, the R25 was replaced by the R28, which, as the model designation suggests, had more power. Creeper gears were now available as an option. The standard and A versions had 40″ wheels, while the B version had 24″ or 28″ wheels. The S version was a road model without a lift device and had a top speed of 25 km/h. The RC version had front wheels mounted side by side. The N version was a narrow model for horticultural use.

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