In the Deutz 05 series introduced in 1965, all models were equipped with the new 812 series engines. The smallest model in the four-cylinder lineup, the 5005, had the same engine as the previous year's D50.1. The 5505 was equipped with a more powerful version of the same engine and had a more robust transmission and hydraulics. The largest model in the lineup was the six-cylinder 8005, which was almost identical to the D80 introduced the previous year. In Finland, the SAE horsepower ratings were higher than those in Germany: for example, the 5505, which had 52 DIN horsepower, was rated at 60 hp in Finland and 56 hp in Germany; similarly, the 8005 was rated at 87 hp in Finland and 81 hp in Germany SAE.

The 5005 had a 6+2 speed gearbox, while the ZF transmissions in the other models had 8+4 speeds. In 1967, the 5005 received an 8+2 speed gearbox. A Tandem version of the 5505 was also produced, which combined two tractors.

For 1967, the 5505 was replaced by the 6005, equipped with a direct injection diesel engine delivering 58 DIN horsepower and featuring 9+3 gears. Its steering was hydrostatic, as was the case with the 8005. At the same time, the 8005 was replaced by the 9005, whose engine was developed for the 06 series and had 5 hp more power, along with a new transmission. The 6005, 8005, and 9005 were the first Deutz models available with a ZF-driven front axle. The 9005 featured hydraulic drum brakes.

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