In 1950, the R40 was replaced by the new R45, which featured a more modern design and a 5.7-liter engine. A hydraulic lifting device was also now available. The transmission was the old 5+1 type, with slightly lower gear ratios. In 1953 a new grille was introduced. In 1955, the in-house manufactured feed pump was replaced with one from Bosch. The R45 C was a road model that reached a speed of 25 km/h.

The R35, introduced in 1953, was largely the same tractor as the R28, but the prechamber diesel’s power was increased to 35 horsepower. The grille had vertical slats. The differential lock was an optional accessory. The first units were equipped with Teves hydraulics, but most had Bosch hydraulics. Bosch also supplied, among other things, the starter motor and lights. The clutch was F&S and the steering was ZF. The tractor’s color on the domestic market was dark green or red, and usually red for export.

The R35/45, introduced in 1955, was ahead of its time. It was designed for power take-off demanding uses, such as in front of pull-type combine harvesters. When the PTO was engaged, 10 additional horsepower could be mechanically coupled in, meaning the 35 hp tractor became 45 hp. To increase power, a mechanical Roots blower was used. A dual clutch was standard, which meant there was an extension piece between the engine and the transmission.

Also introduced in 1955 was the era’s large tractor, the R55. Its engine’s power was increased to 55 horsepower and it had larger wheel sizes. The R55 ATK was the road version, featuring a hydraulic clutch and a top speed of 32.5 km/h, as well as an enclosed cab.

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